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Midway through first attempt at ax25. Everything is a mess

aprs_dev
Richard Meadows 2015-04-01 15:13:01 +01:00
rodzic 46bd5f255f
commit e76e078914
11 zmienionych plików z 331 dodań i 15 usunięć
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3
firmware/Peripherals.md
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@ -5,7 +5,6 @@
|*GLCK*|
||gclk0|main clock, internal osc8m|4 MHz
||gclk1|tcxo clock, fed from xosc
||gclk2|rtc feed, fed from gclk1. divide by 4096
|*TC*||
||tc0|telemetry tick timer. 32-bit
@ -13,7 +12,7 @@
||tc2|counts cycles of tcxo. 32-bit
||tc3|^^^^^
||tc4|osc8m event source
||tc5|telemetry pwm 8-bit
||tc5|telemetry pwm 16-bit
|*EXTINT*|
||extint[5]|gps timepulse

30
firmware/inc/aprs.h 100644
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@ -0,0 +1,30 @@
/*
* Outputs aprs to the si_trx
* Copyright (C) 2015 Richard Meadows <richardeoin>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef APRS_H
#define APRS_H
#endif /* APRS_H */

77
firmware/inc/ax25.h 100644
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@ -0,0 +1,77 @@
/*
* Outputs ax25 to the si_trx
* Copyright (C) 2015 Richard Meadows <richardeoin>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef AX25_H
#define AX25_H
#include "ax25_sintable.h"
/**
* Parameters based on the size of the sintable
*/
#define AX25_SINTABLE_SIZE (AX25_SINTABLE_LENGTH*4)
#define AX25_SINTABLE_LUMASK (AX25_SINTABLE_LENGTH-1)
#define AX25_SINTABLE_MASK (AX25_SINTABLE_SIZE-1)
#define AX25_SINTABLE_PART(phase) ((phase >> AX25_SINTABLE_ORDER) & 3)
/**
* Bell-202
*/
#define AX25_BAUD 2200
#define AX25_MARKFREQ 1
#define AX25_SPACEFREQ 2
#define AX25_BITSTUFFINGCOUNT 5
/**
* How many points we output in a single symbol-time
*/
#define AX25_OVERSAMPLING 2
#define AX25_TICK_RATE (AX25_BAUD * AX25_OVERSAMPLING)
/**
* Define the phase velocities for mark and space
*
* This is how many entries in the sin table we step by
*/
#define AX25_MARKPHASEVELOCITY (AX25_SINTABLE_SIZE/AX25_OVERSAMPLING)
#define AX25_SPACEPHASEVELOCITY (AX25_MARKPHASEVELOCITY*(2.2f/1.2f))
// TODO ^^
enum ax25_symbol_t {
AX25_MARK,
AX25_SPACE,
};
void ax25_start();
uint8_t ax25_tick(void);
#endif /* AX25_H */

1
firmware/inc/hw_config.h
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@ -121,6 +121,7 @@
/**
* XOSC
*/
//#define USE_XOSC
#define XOSC_FREQUENCY 16369000
#define XOSC_GCLK1_DIVIDE 4

5
firmware/inc/si_trx_defs.h
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@ -235,6 +235,11 @@ enum {
SI_MODEM_MOD_GPIO_3 = (0x03 << 5),
SI_MODEM_MOD_DIRECT_MODE_SYNC = (0x00 << 7), /* default */
SI_MODEM_MOD_DIRECT_MODE_ASYNC = (0x01 << 7),
SI_MODEM_DATA_RATE = 0x03,
SI_MODEM_TX_NCO_MODE = 0x06,
SI_MODEM_TX_NCO_TXOSR_10X = (0x00 << 26),
SI_MODEM_TX_NCO_TXOSR_40X = (0x01 << 26),
SI_MODEM_TX_NCO_TXOSR_20X = (0x02 << 26),
SI_MODEM_FREQ_DEV = 0x0a,
SI_MODEM_FREQ_OFFSET = 0x0d,
SI_MODEM_CLKGEN_BAND = 0x51,

2
firmware/inc/telemetry.h
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@ -51,7 +51,7 @@ void telemetry_stop(void);
float telemetry_si_temperature(void);
float timer0_tick_init(float frequency);
void timer0_tick_frequency(float frequency);
uint32_t timer0_tick_frequency(float frequency);
void timer0_tick_deinit();
void telemetry_gpio1_pwm_init(void);
void telemetry_gpio1_pwm_duty(float duty_cycle);

111
firmware/src/ax25.c 100644
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@ -0,0 +1,111 @@
/*
* Outputs ax25 to the si_trx
* Copyright (C) 2015 Richard Meadows <richardeoin>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "samd20.h"
#include "ax25.h"
#include "ax25_sintable.h"
#include "si_trx.h"
#define AX25_MARKSINTABLE sintable_512_1500hz
#define AX25_SPACESINTABLE sintable_512_2500hz
uint32_t ax25_phase;
uint32_t ax25_phasevelocity;
uint32_t ax25_oversampling_count;
uint16_t* ax25_sintable;
void ax25_start()
{
/* Init */
ax25_phase = 0;
ax25_phasevelocity = AX25_MARKPHASEVELOCITY;
ax25_sintable = AX25_MARKSINTABLE;
ax25_oversampling_count = -1LL;
}
uint32_t toggle = 0;
enum ax25_symbol_t ax25_get_next_symbol(void) {
return (toggle++ & 1) ? AX25_MARK : AX25_SPACE;
}
void telemetry_gpio1_pwm_duty(float duty_cycle);
/**
* Called at our tick rate, outputs tones
*
* Returns 1 when more work todo, 0 when finished
*/
uint8_t ax25_tick(void)
{
int16_t deviation;
uint32_t sintable_phase = ax25_phase & AX25_SINTABLE_LUMASK;
/* Set the instantaneous fm deviation based on the current phase */
switch (AX25_SINTABLE_PART(ax25_phase)) {
case 0: /* 0° - 90° */
deviation = ax25_sintable[sintable_phase];
break;
case 1: /* 90° - 180° */
deviation = ax25_sintable[AX25_SINTABLE_LUMASK - sintable_phase];
break;
case 2: /* 180° - 270° */
deviation = -ax25_sintable[sintable_phase];
break;
case 3: /* 270° - 360° */
deviation = -ax25_sintable[AX25_SINTABLE_LUMASK - sintable_phase];
break;
default:
deviation = 0;
}
// si_trx_switch_channel(deviation);
// float duty = 0.5 + ((float)deviation/192.0) / 2.0;
float duty = (ax25_get_next_symbol() == AX25_SPACE) ? 1.0 : 0.0;
telemetry_gpio1_pwm_duty(duty);
/* Update with next bit */
if (ax25_oversampling_count++ >= AX25_OVERSAMPLING) {
ax25_oversampling_count = 0;
/* Set phase velocity for next symbol */
if (0) {//ax25_get_next_symbol() == AX25_SPACE) {
ax25_phasevelocity = AX25_SPACEPHASEVELOCITY;
ax25_sintable = AX25_SPACESINTABLE;
} else {
ax25_phasevelocity = AX25_MARKPHASEVELOCITY;
ax25_sintable = AX25_MARKSINTABLE;
}
}
/* Update phase */
ax25_phase += ax25_phasevelocity;
return 1;
}

2
firmware/src/contestia.c
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@ -63,6 +63,8 @@ void contestia_set_tone(uint8_t tone) {
/**
* Called at the baud rate, outputs tones
*
* Returns 1 when more work todo, 0 when finished
*/
uint8_t contestia_tick(void) {

13
firmware/src/main.c
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@ -285,7 +285,9 @@ void init(void)
//wdt_reset_count();
/* Enables the xosc on gclk1 */
#ifdef USE_XOSC
xosc_init();
#endif
led_init();
gps_init();
@ -322,6 +324,17 @@ int main(void)
led_on();
telemetry_start(TELEMETRY_APRS, 0xFFFF);
while (1) {
system_sleep();
}
while (1) {
/* Sleep wait for next telemetry */
while (telemetry_trigger_flag == 0) {

52
firmware/src/si_trx.c
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@ -37,6 +37,18 @@
void _si_trx_transfer_nocts(int tx_count, int rx_count, uint8_t *data)
{
/* Send command */
_si_trx_cs_enable();
for (int i = 0; i < tx_count; i++) {
spi_bitbang_transfer(data[i]);
}
_si_trx_cs_disable();
}
/**
* Generic SPI Send / Receive
*/
@ -247,6 +259,25 @@ static void si_trx_modem_set_deviation(uint32_t deviation)
SI_MODEM_FREQ_DEV,
deviation);
}
static void si_trx_modem_set_tx_datarate(uint32_t rate)
{
uint32_t nco_max_count = ((float)SI406X_TCXO_FREQUENCY / 10);
/* Set TX_NCO_MODE */
_si_trx_set_property_32(SI_PROPERTY_GROUP_MODEM,
SI_MODEM_TX_NCO_MODE,
(SI_MODEM_TX_NCO_TXOSR_10X |
(nco_max_count & 0x03FFFFFF)));
/* Set DATA_RATE */
_si_trx_set_property_24(SI_PROPERTY_GROUP_MODEM,
SI_MODEM_DATA_RATE,
rate & 0xFFFFFF);
}
/**
* Sets the modem frequency offset manually. In units of the
* resolution of the frac-n pll synthsiser.
@ -255,9 +286,20 @@ static void si_trx_modem_set_deviation(uint32_t deviation)
*/
static void si_trx_modem_set_offset(int16_t offset)
{
_si_trx_set_property_16(SI_PROPERTY_GROUP_MODEM,
SI_MODEM_FREQ_OFFSET,
offset);
/* _si_trx_set_property_16(SI_PROPERTY_GROUP_MODEM, */
/* SI_MODEM_FREQ_OFFSET, */
/* offset); */
uint8_t buffer[6];
buffer[0] = SI_CMD_SET_PROPERTY;
buffer[1] = SI_PROPERTY_GROUP_MODEM; // group
buffer[2] = 2;
buffer[3] = SI_MODEM_FREQ_OFFSET; // prop
buffer[4] = (offset >> 8);
buffer[5] = (offset);
_si_trx_transfer_nocts(6, 0, buffer);
}
/**
@ -388,8 +430,10 @@ void si_trx_reset(uint8_t modulation_type, uint16_t deviation)
si_trx_set_frequency(RADIO_FREQUENCY, deviation);
si_trx_set_tx_power(RADIO_POWER);
si_trx_modem_set_tx_datarate(2200);
/* RTTY from GPIO1 */
si_trx_modem_set_modulation(SI_MODEM_MOD_DIRECT_MODE_ASYNC,
si_trx_modem_set_modulation(SI_MODEM_MOD_DIRECT_MODE_SYNC, // ASYNC
SI_MODEM_MOD_GPIO_1,
SI_MODEM_MOD_SOURCE_DIRECT,
modulation_type);

50
firmware/src/telemetry.c
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@ -30,6 +30,7 @@
#include "rtty.h"
#include "contestia.h"
#include "rsid.h"
#include "ax25.h"
#include "pips.h"
#include "si_trx.h"
#include "si_trx_defs.h"
@ -150,6 +151,8 @@ int telemetry_start(enum telemetry_t type, int32_t length) {
timer0_tick_init(PIPS_OFF_FREQUENCY);
break;
case TELEMETRY_APRS:
timer0_tick_init(AX25_TICK_RATE);
break;
case TELEMETRY_RSID: /* Not used - see function below */
break;
}
@ -283,7 +286,7 @@ void telemetry_tick(void) {
/* RSID: We PWM frequencies with the external pin */
telemetry_gpio1_pwm_init();
si_trx_on(SI_MODEM_MOD_TYPE_2FSK, 1);
si_trx_on(SI_MODEM_MOD_TYPE_2GFSK, 1);
radio_on = 1;
return;
@ -299,6 +302,23 @@ void telemetry_tick(void) {
}
break;
case TELEMETRY_APRS: /* ---- ---- APRS */
if (!radio_on) {
/* ARPS: We use the modem offset to modulate */
telemetry_gpio1_pwm_init();
//telemetry_gpio1_pwm_duty(0.5);
si_trx_on(SI_MODEM_MOD_TYPE_2GFSK, 400);
radio_on = 1;
ax25_start();
}
ax25_tick();
break;
case TELEMETRY_PIPS: /* ---- ---- A pips mode! */
if (!radio_on) { /* Turn on */
@ -313,6 +333,7 @@ void telemetry_tick(void) {
telemetry_index++;
if (is_telemetry_finished()) return;
}
break;
}
}
}
@ -330,15 +351,23 @@ void telemetry_tick(void) {
*/
float timer0_tick_init(float frequency)
{
#ifdef USE_XOSC
const enum gclk_generator tick_gclk_gen = GCLK_GENERATOR_1;
const uint8_t tick_gclk_gen_num = 1;
#else
const enum gclk_generator tick_gclk_gen = GCLK_GENERATOR_0;
const uint8_t tick_gclk_gen_num = 0;
#endif
/* Calculate the wrap value for the given frequency */
float gclk_frequency = (float)system_gclk_gen_get_hz(1);
float gclk_frequency = (float)system_gclk_gen_get_hz(tick_gclk_gen_num);
uint32_t count = (uint32_t)(gclk_frequency / frequency);
/* Configure Timer 0 */
bool t0_capture_channel_enables[] = {false, false};
uint32_t t0_compare_channel_values[] = {count, 0x0000};
tc_init(TC0,
GCLK_GENERATOR_1,
tick_gclk_gen,
TC_COUNTER_SIZE_32BIT,
TC_CLOCK_PRESCALER_DIV1,
TC_WAVE_GENERATION_MATCH_FREQ,
@ -371,9 +400,11 @@ float timer0_tick_init(float frequency)
return gclk_frequency / (float)count;
}
/**
* Changes the timer0 frequency
* Changes the timer0 frequency.
*
* Returns the timer count that this corresponds to.
*/
void timer0_tick_frequency(float frequency)
uint32_t timer0_tick_frequency(float frequency)
{
float gclk_frequency = (float)system_gclk_chan_get_hz(0);
uint32_t count = (uint32_t)(gclk_frequency / frequency);
@ -381,7 +412,10 @@ void timer0_tick_frequency(float frequency)
tc_set_compare_value(TC0,
TC_COMPARE_CAPTURE_CHANNEL_0,
count);
/* We need to reset the count here so it's not beyond the capture limit */
tc_set_count_value(TC0, 0);
return count;
}
/**
* Disables the timer
@ -405,7 +439,7 @@ void TC0_Handler(void)
#define GPIO1_PWM_STEPS 200 // ~ 20kHz on a 4 MHz clock
#define GPIO1_PWM_STEPS 208 // // ~ 2kHz on a 4 MHz clock
/**
* Initialised PWM at the given duty cycle on the GPIO1 pin of the radio
@ -415,12 +449,12 @@ void telemetry_gpio1_pwm_init(void)
bool capture_channel_enables[] = {false, true};
uint32_t compare_channel_values[] = {0x0000, 0x0000}; // Set duty cycle at 0% by default
//float gclk_frequency = (float)system_gclk_chan_get_hz(0);
//float gclk_frequency = (float)system_gclk_gen_get_hz(0);
tc_init(TC5,
GCLK_GENERATOR_0,
TC_COUNTER_SIZE_8BIT,
TC_CLOCK_PRESCALER_DIV1,
TC_CLOCK_PRESCALER_DIV16,
TC_WAVE_GENERATION_NORMAL_PWM,
TC_RELOAD_ACTION_GCLK,
TC_COUNT_DIRECTION_UP,