kopia lustrzana https://github.com/bristol-seds/pico-tracker
130 wiersze
3.5 KiB
C
130 wiersze
3.5 KiB
C
/*
|
|
* Outputs contestia 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 <string.h>
|
|
|
|
#include "samd20.h"
|
|
#include "contestia.h"
|
|
#include "telemetry.h"
|
|
#include "si_trx.h"
|
|
#include "mfsk.h"
|
|
|
|
#define PREAMBLE_LENGTH CONTESTIA_NUMBER_OF_TONES
|
|
|
|
/**
|
|
* Current output tones
|
|
*/
|
|
int8_t contestia_tones[CONTESTIA_NUMBER_OF_TONES];
|
|
/**
|
|
* Where we are in the current output tones
|
|
*/
|
|
uint32_t contestia_tone_index = 0xFFFFFFFE;
|
|
uint8_t contestia_preamble_index = 0;
|
|
|
|
/**
|
|
* Starts the transmission of a contestia block
|
|
*/
|
|
void contestia_start(char* block) {
|
|
/* Start transmission */
|
|
contestia_mfsk_encode_block(block, contestia_tones);
|
|
contestia_tone_index = 0;
|
|
}
|
|
void contestia_preamble(void) {
|
|
contestia_preamble_index = PREAMBLE_LENGTH;
|
|
}
|
|
|
|
void contestia_set_tone(uint8_t tone) {
|
|
/* Align this to a channel */
|
|
int16_t channel = tone - (CONTESTIA_NUMBER_OF_TONES / 2);
|
|
|
|
si_trx_switch_channel(channel * CONTESTIA_CHANNEL_SPACING);
|
|
}
|
|
|
|
/**
|
|
* Called at the baud rate, outputs tones
|
|
*
|
|
* Returns 1 when more work todo, 0 when finished
|
|
*/
|
|
uint8_t contestia_tick(void) {
|
|
|
|
if (contestia_preamble_index) {
|
|
contestia_preamble_index--;
|
|
|
|
if (contestia_preamble_index & (CONTESTIA_NUMBER_OF_TONES/4)) {
|
|
contestia_set_tone(CONTESTIA_NUMBER_OF_TONES - 1);
|
|
} else {
|
|
contestia_set_tone(0);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (contestia_tone_index < CONTESTIA_NUMBER_OF_TONES) {
|
|
uint8_t binary_code;
|
|
uint8_t grey_code;
|
|
|
|
/* Output grey code */
|
|
binary_code = contestia_tones[contestia_tone_index];
|
|
grey_code = (binary_code >> 1) ^ binary_code;
|
|
|
|
/* Transmit this tone */
|
|
contestia_set_tone(grey_code);
|
|
|
|
} else {
|
|
return 0;
|
|
}
|
|
|
|
contestia_tone_index++;
|
|
|
|
if (contestia_tone_index < CONTESTIA_NUMBER_OF_TONES) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Only certain strings are possible in contestia (no lowercase
|
|
* etc.). This function prases a string and fixed anything that would
|
|
* be converted by contestia transmission.
|
|
*/
|
|
void contestiaize(char* string) {
|
|
for (size_t i = 0; i < strlen(string); i++) {
|
|
|
|
/* lowercase => UPPERCASE */
|
|
if (string[i] >= 'a' && string[i] <= 'z') {
|
|
string[i] += 'A' - 'a';
|
|
}
|
|
|
|
if ((string[i] < '!' || string[i] > 'Z') && /* Not Printable */
|
|
(string[i] != ' ') && (string[i] != '\r') &&
|
|
(string[i] != '\n') && (string[i] != 8) &&
|
|
(string[i] != 0)) {
|
|
string[i] = '?'; /* Comes out as question mark */
|
|
}
|
|
}
|
|
}
|