kopia lustrzana https://github.com/JamesP6000/PiCW
1228 wiersze
34 KiB
C++
1228 wiersze
34 KiB
C++
// See accompanying README and BUILD files for descriptions on how to use this
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// code.
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// License:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Authors:
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// Oliver Mattos, Oskar Weigl, Dan Ankers (MD1CLV), Guido (PE1NNZ),
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// Michael Tatarinov, James Peroulas (AB0JP)
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#include <map>
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#include <deque>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include <chrono>
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#include <random>
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#include <atomic>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <math.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include <malloc.h>
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#include <time.h>
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#include <sys/time.h>
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#include <getopt.h>
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#include <vector>
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#include <iostream>
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#include <sstream>
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#include <iomanip>
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#include <sys/timex.h>
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//using namespace std;
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#define ABORT(a) exit(a)
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// Used for debugging
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#define MARK std::cout << "Currently in file: " << __FILE__ << " line: " << __LINE__ << std::endl
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// PLLD clock frequency.
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// There seems to be a 2.5ppm offset between the NTP measured frequency
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// error and the frequency error measured by a frequency counter. This fixed
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// PPM offset is compensated for here.
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#define F_PLLD_CLK (500000000.0*(1-2.500e-6))
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// Empirical value for F_PWM_CLK that produces WSPR symbols that are 'close' to
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// 0.682s long. For some reason, despite the use of DMA, the load on the PI
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// affects the TX length of the symbols. However, the varying symbol length is
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// compensated for in the main loop.
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#define F_PWM_CLK_INIT (31156186.6125761)
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// WSRP nominal symbol time
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//#define WSPR_SYMTIME (8192.0/12000.0)
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// How much random frequency offset should be added to WSPR transmissions
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// if the --offset option has been turned on.
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//#define WSPR_RAND_OFFSET 80
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//#define WSPR15_RAND_OFFSET 8
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#define BCM2708_PERI_BASE 0x20000000
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#define GPIO_BASE (BCM2708_PERI_BASE + 0x200000) /* GPIO controller */
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#define PAGE_SIZE (4*1024)
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#define BLOCK_SIZE (4*1024)
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// This must be declared global so that it can be used by the atexit
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// function.
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volatile unsigned *allof7e = NULL;
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// GPIO setup macros. Always use INP_GPIO(x) before using OUT_GPIO(x) or SET_GPIO_ALT(x,y)
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#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
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#define OUT_GPIO(g) *(gpio+((g)/10)) |= (1<<(((g)%10)*3))
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#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
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#define GPIO_SET *(gpio+7) // sets bits which are 1 ignores bits which are 0
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#define GPIO_CLR *(gpio+10) // clears bits which are 1 ignores bits which are 0
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#define GPIO_GET *(gpio+13) // sets bits which are 1 ignores bits which are 0
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#define ACCESS(base) *(volatile int*)((long int)allof7e+base-0x7e000000)
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#define SETBIT(base, bit) ACCESS(base) |= 1<<bit
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#define CLRBIT(base, bit) ACCESS(base) &= ~(1<<bit)
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#define CM_GP0CTL (0x7e101070)
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#define GPFSEL0 (0x7E200000)
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#define PADS_GPIO_0_27 (0x7e10002c)
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#define CM_GP0DIV (0x7e101074)
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#define CLKBASE (0x7E101000)
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#define DMABASE (0x7E007000)
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#define PWMBASE (0x7e20C000) /* PWM controller */
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struct CB {
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volatile unsigned int TI;
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volatile unsigned int SOURCE_AD;
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volatile unsigned int DEST_AD;
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volatile unsigned int TXFR_LEN;
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volatile unsigned int STRIDE;
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volatile unsigned int NEXTCONBK;
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volatile unsigned int RES1;
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volatile unsigned int RES2;
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};
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struct DMAregs {
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volatile unsigned int CS;
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volatile unsigned int CONBLK_AD;
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volatile unsigned int TI;
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volatile unsigned int SOURCE_AD;
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volatile unsigned int DEST_AD;
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volatile unsigned int TXFR_LEN;
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volatile unsigned int STRIDE;
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volatile unsigned int NEXTCONBK;
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volatile unsigned int DEBUG;
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};
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struct PageInfo {
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void* p; // physical address
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void* v; // virtual address
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};
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// Get the physical address of a page of virtual memory
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void getRealMemPage(void** vAddr, void** pAddr) {
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void* a = (void*)valloc(4096);
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((int*)a)[0] = 1; // use page to force allocation.
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mlock(a, 4096); // lock into ram.
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*vAddr = a; // yay - we know the virtual address
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unsigned long long frameinfo;
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int fp = open("/proc/self/pagemap", 'r');
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lseek(fp, ((long int)a)/4096*8, SEEK_SET);
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read(fp, &frameinfo, sizeof(frameinfo));
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*pAddr = (void*)((long int)(frameinfo*4096));
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}
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void freeRealMemPage(void* vAddr) {
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munlock(vAddr, 4096); // unlock ram.
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free(vAddr);
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}
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// Transmit tone tone_freq for tsym seconds.
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//
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// TODO:
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// Upon entering this function at the beginning of a WSPR transmission, we
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// do not know which DMA table entry is being processed by the DMA engine.
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#define PWM_CLOCKS_PER_ITER_NOMINAL 1000
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void txSym(
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std::atomic <bool> & terminate,
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const double & tone_freq,
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const double & tsym,
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const std::vector <double> & dma_table_freq,
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const double & f_pwm_clk,
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struct PageInfo instrs[],
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struct PageInfo & constPage,
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int & bufPtr
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) {
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const int f0_idx=0;
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const int f1_idx=1;
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const double f0_freq=dma_table_freq[f0_idx];
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const double f1_freq=dma_table_freq[f1_idx];
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// Double check...
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assert((tone_freq>=f0_freq)&&(tone_freq<=f1_freq));
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const double f0_ratio=1.0-(tone_freq-f0_freq)/(f1_freq-f0_freq);
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//cout << "f0_ratio = " << f0_ratio << endl;
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assert ((f0_ratio>=0)&&(f0_ratio<=1));
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const long int n_pwmclk_per_sym=round(f_pwm_clk*tsym);
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long int n_pwmclk_transmitted=0;
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long int n_f0_transmitted=0;
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while ((!terminate)&&(n_pwmclk_transmitted<n_pwmclk_per_sym)) {
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// Number of PWM clocks for this iteration
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long int n_pwmclk=PWM_CLOCKS_PER_ITER_NOMINAL;
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// Iterations may produce spurs around the main peak based on the iteration
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// frequency. Randomize the iteration period so as to spread this peak
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// around.
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n_pwmclk+=round((rand()/((double)RAND_MAX+1.0)-.5)*n_pwmclk)*1;
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if (n_pwmclk_transmitted+n_pwmclk>n_pwmclk_per_sym) {
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n_pwmclk=n_pwmclk_per_sym-n_pwmclk_transmitted;
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}
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// Calculate number of clocks to transmit f0 during this iteration so
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// that the long term average is as close to f0_ratio as possible.
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const long int n_f0=round(f0_ratio*(n_pwmclk_transmitted+n_pwmclk))-n_f0_transmitted;
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const long int n_f1=n_pwmclk-n_f0;
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// Configure the transmission for this iteration
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// Set GPIO pin to transmit f0
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bufPtr++;
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while( ACCESS(DMABASE + 0x04 /* CurBlock*/) == (long int)(instrs[bufPtr].p)) usleep(100);
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((struct CB*)(instrs[bufPtr].v))->SOURCE_AD = (long int)constPage.p + f0_idx*4;
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// Wait for n_f0 PWM clocks
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bufPtr++;
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while( ACCESS(DMABASE + 0x04 /* CurBlock*/) == (long int)(instrs[bufPtr].p)) usleep(100);
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((struct CB*)(instrs[bufPtr].v))->TXFR_LEN = n_f0;
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// Set GPIO pin to transmit f1
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bufPtr++;
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while( ACCESS(DMABASE + 0x04 /* CurBlock*/) == (long int)(instrs[bufPtr].p)) usleep(100);
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((struct CB*)(instrs[bufPtr].v))->SOURCE_AD = (long int)constPage.p + f1_idx*4;
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// Wait for n_f1 PWM clocks
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bufPtr=(bufPtr+1) % (1024);
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while( ACCESS(DMABASE + 0x04 /* CurBlock*/) == (long int)(instrs[bufPtr].p)) usleep(100);
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((struct CB*)(instrs[bufPtr].v))->TXFR_LEN = n_f1;
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// Update counters
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n_pwmclk_transmitted+=n_pwmclk;
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n_f0_transmitted+=n_f0;
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}
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}
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void unSetupDMA(){
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//printf("exiting\n");
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struct DMAregs* DMA0 = (struct DMAregs*)&(ACCESS(DMABASE));
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DMA0->CS =1<<31; // reset dma controller
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// Turn off GPIO clock
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ACCESS(CM_GP0CTL) =
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// PW
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(0x5a<<24) |
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// MASH
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(1<<9) |
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// Flip
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(0<<8) |
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// Busy
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(0<<7) |
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// Kill
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(0<<5) |
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// Enable
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(0<<4) |
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// SRC
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(6<<0)
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;
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}
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void handSig(const int h) {
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exit(0);
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}
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double bit_trunc(
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const double & d,
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const int & lsb
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) {
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return floor(d/pow(2.0,lsb))*pow(2.0,lsb);
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}
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// Setup the DMA table to produce the frequency we need.
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// For PiFM, this table had 1024 entries but for this application, we only
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// use the first two. The remaining values are filled with dummy data.
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void setupDMATab(
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const double & tone_freq,
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const double & plld_actual_freq,
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std::vector <double> & dma_table_freq,
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struct PageInfo & constPage
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){
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// We only really need two tuning words...
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// TODO: It seems to be safe to change the fractional part of the divisor
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// while the clock generator is enabled. Check to see that it is also safe
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// to change the integer part. If it is not safe to change the integer part,
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// then there will be some frequencies which are not synthesizeable.
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std::vector <long int> tuning_word(1024);
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double div=bit_trunc(plld_actual_freq/tone_freq,-12)+pow(2.0,-12);
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tuning_word[0]=((int)(div*pow(2.0,12)));
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div-=pow(2.0,-12);
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tuning_word[1]=((int)(div*pow(2.0,12)));
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// Fill the remaining table, just in case...
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for (int i=8;i<1024;i++) {
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double div=500+i;
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tuning_word[i]=((int)(div*pow(2.0,12)));
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}
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// Program the table
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dma_table_freq.resize(1024);
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for (int i=0;i<1024;i++) {
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dma_table_freq[i]=plld_actual_freq/(tuning_word[i]/pow(2.0,12));
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((int*)(constPage.v))[i] = (0x5a<<24)+tuning_word[i];
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//if ((i%2==0)&&(i<8)) {
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// assert((tuning_word[i]&(~0xfff))==(tuning_word[i+1]&(~0xfff)));
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//}
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}
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}
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void setupDMA(
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struct PageInfo & constPage,
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struct PageInfo & instrPage,
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struct PageInfo instrs[]
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){
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atexit(unSetupDMA);
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signal (SIGINT, handSig);
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signal (SIGTERM, handSig);
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signal (SIGHUP, handSig);
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signal (SIGQUIT, handSig);
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// Allocate a page of ram for the constants
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getRealMemPage(&constPage.v, &constPage.p);
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// Create 1024 instructions allocating one page at a time.
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// Even instructions target the GP0 Clock divider
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// Odd instructions target the PWM FIFO
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int instrCnt = 0;
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while (instrCnt<1024) {
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// Allocate a page of ram for the instructions
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getRealMemPage(&instrPage.v, &instrPage.p);
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// make copy instructions
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// Only create as many instructions as will fit in the recently
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// allocated page. If not enough space for all instructions, the
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// next loop will allocate another page.
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struct CB* instr0= (struct CB*)instrPage.v;
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int i;
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for (i=0; i<(signed)(4096/sizeof(struct CB)); i++) {
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instrs[instrCnt].v = (void*)((long int)instrPage.v + sizeof(struct CB)*i);
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instrs[instrCnt].p = (void*)((long int)instrPage.p + sizeof(struct CB)*i);
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instr0->SOURCE_AD = (unsigned long int)constPage.p+2048;
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instr0->DEST_AD = PWMBASE+0x18 /* FIF1 */;
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instr0->TXFR_LEN = 4;
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instr0->STRIDE = 0;
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//instr0->NEXTCONBK = (int)instrPage.p + sizeof(struct CB)*(i+1);
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instr0->TI = (1/* DREQ */<<6) | (5 /* PWM */<<16) | (1<<26/* no wide*/) ;
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instr0->RES1 = 0;
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instr0->RES2 = 0;
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// Shouldn't this be (instrCnt%2) ???
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if (i%2) {
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instr0->DEST_AD = CM_GP0DIV;
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instr0->STRIDE = 4;
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instr0->TI = (1<<26/* no wide*/) ;
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}
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if (instrCnt!=0) ((struct CB*)(instrs[instrCnt-1].v))->NEXTCONBK = (long int)instrs[instrCnt].p;
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instr0++;
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instrCnt++;
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}
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}
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// Create a circular linked list of instructions
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((struct CB*)(instrs[1023].v))->NEXTCONBK = (long int)instrs[0].p;
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// set up a clock for the PWM
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ACCESS(CLKBASE + 40*4 /*PWMCLK_CNTL*/) = 0x5A000026; // Source=PLLD and disable
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usleep(1000);
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//ACCESS(CLKBASE + 41*4 /*PWMCLK_DIV*/) = 0x5A002800;
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ACCESS(CLKBASE + 41*4 /*PWMCLK_DIV*/) = 0x5A002000; // set PWM div to 2, for 250MHz
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ACCESS(CLKBASE + 40*4 /*PWMCLK_CNTL*/) = 0x5A000016; // Source=PLLD and enable
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usleep(1000);
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// set up pwm
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ACCESS(PWMBASE + 0x0 /* CTRL*/) = 0;
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usleep(1000);
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ACCESS(PWMBASE + 0x4 /* status*/) = -1; // clear errors
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usleep(1000);
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// Range should default to 32, but it is set at 2048 after reset on my RPi.
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ACCESS(PWMBASE + 0x10)=32;
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ACCESS(PWMBASE + 0x20)=32;
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ACCESS(PWMBASE + 0x0 /* CTRL*/) = -1; //(1<<13 /* Use fifo */) | (1<<10 /* repeat */) | (1<<9 /* serializer */) | (1<<8 /* enable ch */) ;
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usleep(1000);
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ACCESS(PWMBASE + 0x8 /* DMAC*/) = (1<<31 /* DMA enable */) | 0x0707;
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//activate dma
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struct DMAregs* DMA0 = (struct DMAregs*)&(ACCESS(DMABASE));
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DMA0->CS =1<<31; // reset
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DMA0->CONBLK_AD=0;
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DMA0->TI=0;
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DMA0->CONBLK_AD = (unsigned long int)(instrPage.p);
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DMA0->CS =(1<<0)|(255 <<16); // enable bit = 0, clear end flag = 1, prio=19-16
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}
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//
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// Set up memory regions to access GPIO
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//
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void setup_io(
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int & mem_fd,
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char * & gpio_mem,
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char * & gpio_map,
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volatile unsigned * & gpio
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) {
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/* open /dev/mem */
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if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
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printf("can't open /dev/mem \n");
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exit (-1);
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}
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/* mmap GPIO */
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// Allocate MAP block
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if ((gpio_mem = (char *)malloc(BLOCK_SIZE + (PAGE_SIZE-1))) == NULL) {
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printf("allocation error \n");
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exit (-1);
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}
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// Make sure pointer is on 4K boundary
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if ((unsigned long)gpio_mem % PAGE_SIZE)
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gpio_mem += PAGE_SIZE - ((unsigned long)gpio_mem % PAGE_SIZE);
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// Now map it
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gpio_map = (char *)mmap(
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gpio_mem,
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BLOCK_SIZE,
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PROT_READ|PROT_WRITE,
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MAP_SHARED|MAP_FIXED,
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mem_fd,
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GPIO_BASE
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);
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if ((long)gpio_map < 0) {
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printf("mmap error %ld\n", (long int)gpio_map);
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exit (-1);
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}
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// Always use volatile pointer!
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gpio = (volatile unsigned *)gpio_map;
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}
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void setup_gpios(
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volatile unsigned * & gpio
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){
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int g;
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// Switch GPIO 7..11 to output mode
|
||
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/************************************************************************\
|
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* You are about to change the GPIO settings of your computer. *
|
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* Mess this up and it will stop working! *
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* It might be a good idea to 'sync' before running this program *
|
||
* so at least you still have your code changes written to the SD-card! *
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\************************************************************************/
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// Set GPIO pins 7-11 to output
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for (g=7; g<=11; g++) {
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INP_GPIO(g); // must use INP_GPIO before we can use OUT_GPIO
|
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//OUT_GPIO(g);
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}
|
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|
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}
|
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|
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void print_usage() {
|
||
std::cout << "Usage:" << std::endl;
|
||
std::cout << " PiCW [options] \"text to send in Morse code\"" << std::endl;
|
||
std::cout << std::endl;
|
||
std::cout << "Options:" << std::endl;
|
||
std::cout << " -h --help" << std::endl;
|
||
std::cout << " Print out this help screen." << std::endl;
|
||
std::cout << " -f --freq f" << std::endl;
|
||
std::cout << " Specify the frequency to be used for the transmission." << std::endl;
|
||
std::cout << " -w --wpm w" << std::endl;
|
||
std::cout << " Specify the transmission speed in Words Per Minute (default 20 WPM)." << std::endl;
|
||
std::cout << " -p --ppm ppm" << std::endl;
|
||
std::cout << " Known PPM correction to 19.2MHz RPi nominal crystal frequency." << std::endl;
|
||
std::cout << " -s --self-calibration" << std::endl;
|
||
std::cout << " Call ntp_adjtime() periodically to obtain the PPM error of the crystal." << std::endl;
|
||
std::cout << " -d --ditdit" << std::endl;
|
||
std::cout << " Transmit an endless series of dits. Can be used to measure TX spectrum." << std::endl;
|
||
std::cout << " -t --test-tone" << std::endl;
|
||
std::cout << " Continuously transmit a test tone at the requested frequency." << std::endl;
|
||
}
|
||
|
||
void parse_commandline(
|
||
// Inputs
|
||
const int & argc,
|
||
char * const argv[],
|
||
// Outputs
|
||
double & tone_freq,
|
||
double & wpm,
|
||
double & ppm,
|
||
bool & self_cal,
|
||
std::string & str,
|
||
bool & ditdit,
|
||
bool & test_tone
|
||
) {
|
||
// Default values
|
||
tone_freq=NAN;
|
||
wpm=20;
|
||
ppm=0;
|
||
self_cal=false;
|
||
str="";
|
||
ditdit=false;
|
||
test_tone=false;
|
||
|
||
static struct option long_options[] = {
|
||
{"help", no_argument, 0, 'h'},
|
||
{"freq", required_argument, 0, 'f'},
|
||
{"wpm", required_argument, 0, 'w'},
|
||
{"ppm", required_argument, 0, 'p'},
|
||
{"self-calibration", no_argument, 0, 's'},
|
||
{"ditdit", no_argument, 0, 'd'},
|
||
{"test-tone", no_argument, 0, 't'},
|
||
{0, 0, 0, 0}
|
||
};
|
||
|
||
while (1) {
|
||
/* getopt_long stores the option index here. */
|
||
int option_index = 0;
|
||
int c = getopt_long (argc, argv, "hf:w:p:s",
|
||
long_options, &option_index);
|
||
if (c == -1)
|
||
break;
|
||
|
||
switch (c) {
|
||
char * endp;
|
||
case 0:
|
||
// Code should only get here if a long option was given a non-null
|
||
// flag value.
|
||
std::cout << "Check code!" << std::endl;
|
||
ABORT(-1);
|
||
break;
|
||
case 'h':
|
||
print_usage();
|
||
ABORT(-1);
|
||
break;
|
||
case 'f':
|
||
tone_freq=strtod(optarg,&endp);
|
||
if ((optarg==endp)||(*endp!='\0')) {
|
||
std::cerr << "Error: could not parse frequency" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
break;
|
||
case 'w':
|
||
wpm=strtod(optarg,&endp);
|
||
if ((optarg==endp)||(*endp!='\0')) {
|
||
std::cerr << "Error: could not parse wpm value" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
break;
|
||
case 'p':
|
||
ppm=strtod(optarg,&endp);
|
||
if ((optarg==endp)||(*endp!='\0')) {
|
||
std::cerr << "Error: could not parse ppm value" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
break;
|
||
case 's':
|
||
self_cal=true;
|
||
break;
|
||
case 'd':
|
||
ditdit=true;
|
||
break;
|
||
case 't':
|
||
test_tone=true;
|
||
break;
|
||
case '?':
|
||
/* getopt_long already printed an error message. */
|
||
ABORT(-1);
|
||
default:
|
||
ABORT(-1);
|
||
}
|
||
|
||
}
|
||
|
||
// Parse the non-option parameters
|
||
while (optind<argc) {
|
||
if (!str.empty()) {
|
||
str+=" ";
|
||
}
|
||
str+=argv[optind++];
|
||
}
|
||
|
||
// Check consistency among command line options.
|
||
if (ppm&&self_cal) {
|
||
std::cout << "Warning: ppm value is being ignored!" << std::endl;
|
||
ppm=0.0;
|
||
}
|
||
if (isnan(tone_freq)) {
|
||
std::cerr << "Error: must specify TX frequency (try --help)" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
if ((!str.empty())&&ditdit) {
|
||
std::cerr << "Error: cannot transmit text when ditdit mode is requested" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
if ((!str.empty())&&test_tone) {
|
||
std::cerr << "Error: cannot transmit text when test-tone mode is requested" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
if (test_tone&&ditdit) {
|
||
std::cerr << "Error: cannot request test-tone and ditdit modes at the same time" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
|
||
// Print a summary of the parsed options
|
||
std::cout << "PiCW parsed command line options:" << std::endl;
|
||
std::stringstream temp;
|
||
temp << std::setprecision(6) << std::fixed;
|
||
temp << tone_freq/1e6 << " MHz";
|
||
std::cout << " TX frequency: " << temp.str() << std::endl;
|
||
temp.str("");
|
||
if (!test_tone) {
|
||
std::cout << " WPM: " << wpm << std::endl;
|
||
}
|
||
if (self_cal) {
|
||
temp << " ntp_adjtime() will be used to periodically calibrate the transmission frequency" << std::endl;
|
||
} else if (ppm) {
|
||
temp << " PPM value to be used for all transmissions: " << ppm << std::endl;
|
||
}
|
||
if (ditdit) {
|
||
std::cout << "Will transmit an endless series of dits. CTRL-C to exit." << std::endl;
|
||
} else if (test_tone) {
|
||
std::cout << "Will transmit continuous tone on frequency. CTRL-C to exit." << std::endl;
|
||
} else {
|
||
std::cout << "Message to be sent:" << std::endl;
|
||
std::cout << '"' << str << '"' << std::endl;
|
||
}
|
||
}
|
||
|
||
// Call ntp_adjtime() to obtain the latest calibration coefficient.
|
||
void update_ppm(
|
||
double & ppm
|
||
) {
|
||
struct timex ntx;
|
||
int status;
|
||
double ppm_new;
|
||
|
||
ntx.modes = 0; /* only read */
|
||
status = ntp_adjtime(&ntx);
|
||
|
||
if (status != TIME_OK) {
|
||
//cerr << "Error: clock not synchronized" << std::endl;
|
||
//return;
|
||
}
|
||
|
||
ppm_new = (double)ntx.freq/(double)(1 << 16); /* frequency scale */
|
||
if (abs(ppm_new)>200) {
|
||
std::cerr << "Warning: absolute ppm value is greater than 200 and is being ignored!" << std::endl;
|
||
} else {
|
||
if (ppm!=ppm_new) {
|
||
//std::cout << " Obtained new ppm value: " << ppm_new << std::endl;
|
||
}
|
||
ppm=ppm_new;
|
||
}
|
||
}
|
||
|
||
// This thread manages the tone being produced. If the desired frequency
|
||
// changes, or if the PPM value is updated, this thread will take appropriate
|
||
// measures to ensure that the tone being produced is as close as possible
|
||
// to the frequency that is desired.
|
||
void tone_main(
|
||
std::atomic <bool> & terminate,
|
||
const bool & self_cal,
|
||
const double & ppm_init,
|
||
std::atomic <double> & freq,
|
||
struct PageInfo instrs[],
|
||
struct PageInfo & constPage,
|
||
std::atomic <bool> & tone_thread_ready
|
||
) {
|
||
// Initialize
|
||
double ppm=ppm_init;
|
||
if (self_cal) {
|
||
update_ppm(ppm);
|
||
}
|
||
double ppm_old=ppm;
|
||
double freq_old=freq;
|
||
std::vector <double> dma_table_freq;
|
||
setupDMATab(freq_old,F_PLLD_CLK*(1-ppm_old/1e6),dma_table_freq,constPage);
|
||
int bufPtr=0;
|
||
|
||
while (!terminate) {
|
||
// Read the current values of the atomics.
|
||
double freq_new=freq;
|
||
double ppm_new=ppm;
|
||
|
||
// Update table if necessary.
|
||
if (
|
||
(ppm_new!=ppm_old) ||
|
||
(freq_new<dma_table_freq[0]) ||
|
||
(freq_new>dma_table_freq[1])
|
||
) {
|
||
setupDMATab(freq_new,F_PLLD_CLK*(1-ppm_new/1e6),dma_table_freq,constPage);
|
||
}
|
||
|
||
// Transmit for a small amount of time before checking for updates to
|
||
// frequency or PPM.
|
||
double tx_time_secs=1.0;
|
||
tone_thread_ready=true;
|
||
txSym(
|
||
terminate,
|
||
freq_new,
|
||
tx_time_secs,
|
||
dma_table_freq,
|
||
F_PWM_CLK_INIT,
|
||
instrs,
|
||
constPage,
|
||
bufPtr
|
||
);
|
||
|
||
freq_old=freq_new;
|
||
ppm_old=ppm_new;
|
||
}
|
||
}
|
||
|
||
// The rise and fall ramps are stored as collections of time/value pairs.
|
||
class time_value {
|
||
public:
|
||
std::chrono::duration <double> time;
|
||
unsigned int value;
|
||
};
|
||
|
||
// Rectangular ramp that simply goes high or low in the middle of the ramp
|
||
// period.
|
||
void rectangle(
|
||
const double & width_secs,
|
||
std::vector <time_value> & rise,
|
||
std::vector <time_value> & fall
|
||
) {
|
||
rise.resize(0);
|
||
rise.reserve(3);
|
||
fall.resize(0);
|
||
fall.reserve(3);
|
||
{
|
||
time_value rec;
|
||
rec.value=0;
|
||
rec.time=std::chrono::duration <double> (0);
|
||
rise.push_back(rec);
|
||
rec.value=8;
|
||
fall.push_back(rec);
|
||
}
|
||
{
|
||
time_value rec;
|
||
rec.value=8;
|
||
rec.time=std::chrono::duration <double> (width_secs/2);
|
||
rise.push_back(rec);
|
||
rec.value=0;
|
||
fall.push_back(rec);
|
||
}
|
||
{
|
||
time_value rec;
|
||
rec.value=8;
|
||
rec.time=std::chrono::duration <double> (width_secs);
|
||
rise.push_back(rec);
|
||
rec.value=0;
|
||
fall.push_back(rec);
|
||
}
|
||
}
|
||
|
||
// Raised cosine rise/ fall ramps.
|
||
void raised_cosine(
|
||
const double & width_secs,
|
||
std::vector <time_value> & rise,
|
||
std::vector <time_value> & fall
|
||
) {
|
||
rise.resize(0);
|
||
rise.reserve(10);
|
||
fall.resize(0);
|
||
fall.reserve(10);
|
||
{
|
||
time_value rec;
|
||
rec.value=0;
|
||
rec.time=std::chrono::duration <double> (0);
|
||
rise.push_back(rec);
|
||
rec.value=8;
|
||
fall.push_back(rec);
|
||
}
|
||
for (double y=0.5/8.0;y<1;y+=1.0/8.0) {
|
||
time_value rec;
|
||
rec.value=round(y*8.0+0.5);
|
||
rec.time=std::chrono::duration <double> (acos(1-2*y)/M_PI*width_secs);
|
||
rise.push_back(rec);
|
||
}
|
||
for (double y=7.5/8.0;y>0;y-=1.0/8.0) {
|
||
time_value rec;
|
||
rec.value=round(y*8.0-0.5);
|
||
rec.time=std::chrono::duration <double> (acos(2*y-1)/M_PI*width_secs);
|
||
fall.push_back(rec);
|
||
}
|
||
{
|
||
time_value rec;
|
||
rec.value=8;
|
||
rec.time=std::chrono::duration <double> (width_secs);
|
||
rise.push_back(rec);
|
||
rec.value=0;
|
||
fall.push_back(rec);
|
||
}
|
||
}
|
||
|
||
// Adjust the drive current on the pin.
|
||
void set_current(
|
||
unsigned int value
|
||
) {
|
||
if (value>8) {
|
||
value=8;
|
||
}
|
||
if (value==0) {
|
||
// Turn off output
|
||
ACCESS(CM_GP0CTL) =
|
||
// PW
|
||
(0x5a<<24) |
|
||
// MASH
|
||
(1<<9) |
|
||
// Flip
|
||
(0<<8) |
|
||
// Busy
|
||
(0<<7) |
|
||
// Kill
|
||
(0<<5) |
|
||
// Enable
|
||
(0<<4) |
|
||
// SRC
|
||
(6<<0)
|
||
;
|
||
} else {
|
||
// Set drive strength
|
||
ACCESS(PADS_GPIO_0_27) = 0x5a000018 + ((value - 1)&0x7);
|
||
// Turn on output
|
||
ACCESS(CM_GP0CTL) =
|
||
// PW
|
||
(0x5a<<24) |
|
||
// MASH
|
||
(3<<9) |
|
||
// Flip
|
||
(0<<8) |
|
||
// Busy
|
||
(0<<7) |
|
||
// Kill
|
||
(0<<5) |
|
||
// Enable
|
||
(1<<4) |
|
||
// SRC
|
||
(6<<0)
|
||
;
|
||
}
|
||
}
|
||
|
||
// Send either a dit or a dah
|
||
void send_dit_dah(
|
||
std::atomic <bool> & terminate,
|
||
const char & sym,
|
||
const double & dot_duration_sec,
|
||
std::mt19937 & gen
|
||
) {
|
||
// Setting ramp_excess to 0 will produce hard keying. A ramp_excess value
|
||
// of 1.0 will produce a dit that has a ramp going up, a ramp going down,
|
||
// and no flat portion.
|
||
const double ramp_excess=0.3;
|
||
const std::chrono::duration <double> ramp_time(dot_duration_sec*ramp_excess);
|
||
const std::chrono::duration <double> flat_time(dot_duration_sec*(1-ramp_excess)+((sym=='-')?(2*dot_duration_sec):(0)));
|
||
// Jitter adjusts the timing of the rising and falling ramp. This serves
|
||
// to spread out the harmonics that are created.
|
||
const double jitter_factor=0.1;
|
||
std::uniform_real_distribution<> dis(0,jitter_factor*dot_duration_sec);
|
||
const std::chrono::duration <double> jitter_rise(dis(gen));
|
||
const std::chrono::duration <double> jitter_fall(dis(gen));
|
||
|
||
// Calculate the rise and fall ramps, if needed.
|
||
static bool initialized=false;
|
||
static std::chrono::duration <double> ramp_time_prev(0);
|
||
static std::vector <time_value> rise;
|
||
static std::vector <time_value> fall;
|
||
if ((!initialized)||(ramp_time_prev!=ramp_time)) {
|
||
#if 1
|
||
raised_cosine(
|
||
ramp_time.count(),
|
||
rise,
|
||
fall
|
||
);
|
||
#else
|
||
rectangle(
|
||
ramp_time.count(),
|
||
rise,
|
||
fall
|
||
);
|
||
#endif
|
||
initialized=true;
|
||
}
|
||
|
||
// Dit or dah pulse will be timed relative to the current time.
|
||
std::chrono::high_resolution_clock::time_point ref=std::chrono::high_resolution_clock::now();
|
||
|
||
// Delay the rising ramp.
|
||
//std::chrono::duration <double> jitter_rise_duration(jitter_rise);
|
||
std::this_thread::sleep_until(ref+jitter_rise);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
// Rising ramp.
|
||
for (auto & tv:rise) {
|
||
std::this_thread::sleep_until(ref+jitter_rise+tv.time);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
set_current(tv.value);
|
||
}
|
||
// Keep transmitting at full power until after the flat portion and after
|
||
// the second jitter delay.
|
||
std::this_thread::sleep_until(ref+ramp_time+flat_time+jitter_fall);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
// Falling ramp.
|
||
for (auto & tv:fall) {
|
||
std::this_thread::sleep_until(ref+ramp_time+flat_time+jitter_fall+tv.time);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
set_current(tv.value);
|
||
}
|
||
}
|
||
|
||
// This is the thread that modulates the carrier and produces the dits and
|
||
// dahs.
|
||
void am_main(
|
||
std::atomic <bool> & terminate,
|
||
std::deque <char> & queue,
|
||
std::mutex & queue_mutex,
|
||
std::condition_variable & queue_signal,
|
||
std::map <char,std::string> & morse_table,
|
||
std::atomic <double> & wpm,
|
||
std::atomic <bool> & busy,
|
||
const bool & ditdit,
|
||
const bool & test_tone
|
||
) {
|
||
// In the case of a test tone, set the drive strength to maximum and
|
||
// turn on output. Nothing else.
|
||
if (test_tone) {
|
||
set_current(8);
|
||
while (true) {
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(100));
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool prev_char_whitespace=true;
|
||
std::chrono::time_point <std::chrono::high_resolution_clock,std::chrono::duration <double>> earliest_tx_time=std::chrono::high_resolution_clock::now();
|
||
|
||
std::random_device rd;
|
||
std::mt19937 gen(rd());
|
||
|
||
while (true) {
|
||
busy=false;
|
||
|
||
// Get the next character from the queue.
|
||
char tx_char='\0';
|
||
if (!ditdit) {
|
||
std::unique_lock <std::mutex> lock(queue_mutex);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
while (queue.empty()) {
|
||
queue_signal.wait_for(lock,std::chrono::milliseconds(100));
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
}
|
||
tx_char=queue.front();
|
||
queue.pop_front();
|
||
busy=true;
|
||
}
|
||
|
||
// Sample (and hold) wpm.
|
||
const double dot_duration_sec=1.2/wpm;
|
||
|
||
// Handle whitespace.
|
||
if ((tx_char==' ')||(tx_char=='\n')) {
|
||
std::cout << tx_char;
|
||
std::cout.flush();
|
||
if (prev_char_whitespace) {
|
||
// Ignore multiple whitespaces.
|
||
continue;
|
||
} else {
|
||
earliest_tx_time=earliest_tx_time+std::chrono::duration <double> (4*dot_duration_sec);
|
||
prev_char_whitespace=true;
|
||
continue;
|
||
}
|
||
}
|
||
prev_char_whitespace=false;
|
||
|
||
if ((!ditdit)&&(morse_table.find(tx_char)==morse_table.end())) {
|
||
// We should never get here... Only characters in morse code table
|
||
// should ever get forwarded here.
|
||
ABORT(-1);
|
||
}
|
||
|
||
// See if we have already waited enough time between characters.
|
||
if (std::chrono::high_resolution_clock::now()>=earliest_tx_time) {
|
||
earliest_tx_time=std::chrono::high_resolution_clock::now();
|
||
}
|
||
|
||
// Send the dits and dahs
|
||
std::string tx_pattern;
|
||
if (ditdit) {
|
||
tx_pattern=".....";
|
||
} else {
|
||
tx_pattern=morse_table[tx_char];
|
||
}
|
||
for (unsigned int t=0;t<tx_pattern.length();t++) {
|
||
std::this_thread::sleep_until(earliest_tx_time);
|
||
if (terminate) {
|
||
return;
|
||
}
|
||
if ((!ditdit)&&(t==0)) {
|
||
std::cout << tx_char;
|
||
std::cout.flush();
|
||
}
|
||
const char sym=tx_pattern[t];
|
||
send_dit_dah(terminate,sym,dot_duration_sec,gen);
|
||
if (sym=='.') {
|
||
earliest_tx_time+=std::chrono::duration <double> (2*dot_duration_sec);
|
||
} else {
|
||
earliest_tx_time+=std::chrono::duration <double> (4*dot_duration_sec);
|
||
}
|
||
if (ditdit) {
|
||
t=0;
|
||
}
|
||
}
|
||
earliest_tx_time+=std::chrono::duration <double> (2*dot_duration_sec);
|
||
}
|
||
}
|
||
|
||
// Initialize the morse code table.
|
||
void morse_table_init(
|
||
std::map <char,std::string> & morse_table
|
||
) {
|
||
morse_table.clear();
|
||
morse_table['A']=".-";
|
||
morse_table['B']="-...";
|
||
morse_table['C']="-.-.";
|
||
morse_table['D']="-..";
|
||
morse_table['E']=".";
|
||
morse_table['F']="..-.";
|
||
morse_table['G']="--.";
|
||
morse_table['H']="....";
|
||
morse_table['I']="..";
|
||
morse_table['J']=".---";
|
||
morse_table['K']="-.-";
|
||
morse_table['L']=".-..";
|
||
morse_table['M']="--";
|
||
morse_table['N']="-.";
|
||
morse_table['O']="---";
|
||
morse_table['P']=".--.";
|
||
morse_table['Q']="--.-";
|
||
morse_table['R']=".-.";
|
||
morse_table['S']="...";
|
||
morse_table['T']="-";
|
||
morse_table['U']="..-";
|
||
morse_table['V']="...-";
|
||
morse_table['W']=".--";
|
||
morse_table['X']="-..-";
|
||
morse_table['Y']="-.--";
|
||
morse_table['Z']="--..";
|
||
morse_table['0']="-----";
|
||
morse_table['1']=".----";
|
||
morse_table['2']="..---";
|
||
morse_table['3']="...--";
|
||
morse_table['4']="....-";
|
||
morse_table['5']=".....";
|
||
morse_table['6']="-....";
|
||
morse_table['7']="--...";
|
||
morse_table['8']="---..";
|
||
morse_table['9']="----.";
|
||
morse_table['.']=".−.−.−";
|
||
morse_table[',']="−−..−−";
|
||
morse_table[':']="−−−...";
|
||
morse_table['?']="..−−..";
|
||
morse_table['\'']=".−−−−.";
|
||
morse_table['-']="−....−";
|
||
morse_table['/']="−..−.";
|
||
morse_table['(']="−.−−.";
|
||
morse_table[')']="−.−−.−";
|
||
morse_table['"']=".−..−.";
|
||
morse_table['=']="−...−";
|
||
morse_table['+']=".−.−.";
|
||
morse_table['*']="−..−";
|
||
morse_table['@']=".––.–.";
|
||
}
|
||
|
||
int main(const int argc, char * const argv[]) {
|
||
// Parse arguments
|
||
double freq_init;
|
||
double wpm_init;
|
||
double ppm_init;
|
||
bool self_cal;
|
||
std::string str;
|
||
bool ditdit;
|
||
bool test_tone;
|
||
parse_commandline(
|
||
argc,
|
||
argv,
|
||
freq_init,
|
||
wpm_init,
|
||
ppm_init,
|
||
self_cal,
|
||
str,
|
||
ditdit,
|
||
test_tone
|
||
);
|
||
|
||
// Initial configuration
|
||
int mem_fd;
|
||
char *gpio_mem, *gpio_map;
|
||
volatile unsigned *gpio = NULL;
|
||
setup_io(mem_fd,gpio_mem,gpio_map,gpio);
|
||
setup_gpios(gpio);
|
||
allof7e = (unsigned *)mmap(
|
||
NULL,
|
||
0x01000000, //len
|
||
PROT_READ|PROT_WRITE,
|
||
MAP_SHARED,
|
||
mem_fd,
|
||
0x20000000 //base
|
||
);
|
||
if ((long int)allof7e==-1) {
|
||
std::cerr << "Error: mmap error!" << std::endl;
|
||
ABORT(-1);
|
||
}
|
||
|
||
// Configure GPIO4
|
||
SETBIT(GPFSEL0 , 14);
|
||
CLRBIT(GPFSEL0 , 13);
|
||
CLRBIT(GPFSEL0 , 12);
|
||
struct PageInfo constPage;
|
||
struct PageInfo instrPage;
|
||
struct PageInfo instrs[1024];
|
||
setupDMA(constPage,instrPage,instrs);
|
||
|
||
// Morse code table.
|
||
std::map <char,std::string> morse_table;
|
||
morse_table_init(morse_table);
|
||
|
||
// Atomics used for IPC
|
||
std::atomic <double> tone_freq;
|
||
tone_freq=freq_init;
|
||
std::atomic <double> wpm;
|
||
wpm=wpm_init;
|
||
|
||
// Start tone thread.
|
||
std::atomic <bool> terminate_tone_thread;
|
||
terminate_tone_thread=false;
|
||
std::atomic <bool> tone_thread_ready;
|
||
tone_thread_ready=false;
|
||
std::thread tone_thread(tone_main,
|
||
std::ref(terminate_tone_thread),
|
||
std::ref(self_cal),
|
||
std::ref(ppm_init),
|
||
std::ref(tone_freq),
|
||
instrs,
|
||
std::ref(constPage),
|
||
std::ref(tone_thread_ready)
|
||
);
|
||
while (!tone_thread_ready) {
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(100));
|
||
}
|
||
|
||
// Start AM thread
|
||
std::atomic <bool> terminate_am_thread;
|
||
terminate_am_thread=false;
|
||
std::deque <char> queue;
|
||
std::mutex queue_mutex;
|
||
std::condition_variable queue_signal;
|
||
std::atomic <bool> am_thread_busy;
|
||
am_thread_busy=false;
|
||
std::thread am_thread(am_main,
|
||
std::ref(terminate_am_thread),
|
||
std::ref(queue),
|
||
std::ref(queue_mutex),
|
||
std::ref(queue_signal),
|
||
std::ref(morse_table),
|
||
std::ref(wpm),
|
||
std::ref(am_thread_busy),
|
||
ditdit,
|
||
test_tone
|
||
);
|
||
|
||
// Push text into AM thread
|
||
{
|
||
std::unique_lock <std::mutex> lock(queue_mutex);
|
||
for (unsigned int t=0;t<str.length();t++) {
|
||
char ch=toupper(str[t]);
|
||
if ((ch==' ')||(ch=='\n')||(morse_table.find(ch)!=morse_table.end())) {
|
||
queue.push_back(ch);
|
||
}
|
||
}
|
||
queue_signal.notify_one();
|
||
}
|
||
|
||
// In ditdit or test-tone mode, can only exit using ctrl-c.
|
||
while (ditdit||test_tone) {
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(200));
|
||
}
|
||
|
||
// Wait for queue to be emptied.
|
||
while (true) {
|
||
{
|
||
std::unique_lock <std::mutex> lock(queue_mutex);
|
||
if (queue.empty()) {
|
||
break;
|
||
}
|
||
}
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(100));
|
||
}
|
||
|
||
// Wait for final character to be transmitted.
|
||
while (am_thread_busy) {
|
||
std::this_thread::sleep_for(std::chrono::milliseconds(100));
|
||
}
|
||
std::cout << std::endl;
|
||
|
||
// Terminate subthreads
|
||
terminate_am_thread=true;
|
||
terminate_tone_thread=true;
|
||
if (am_thread.joinable()) {
|
||
am_thread.join();
|
||
}
|
||
if (tone_thread.joinable()) {
|
||
tone_thread.join();
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|