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Temporary AX.25 include for testing

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This commit is contained in:
Mark Qvist 2014-04-04 00:39:51 +02:00
parent f045376369
commit ee9b5ec307
6 changed files with 55 additions and 19 deletions
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32
Modem/afsk.c
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@ -5,17 +5,13 @@
#include <drv/timer.h>
#include <cfg/module.h>
#define HDLC_FLAG 0x7E
#define HDLC_RESET 0x7F
#define AX25_ESC 0x1B
#include <cfg/log.h>
#include <cpu/power.h>
#include <cpu/pgm.h>
#include <struct/fifobuf.h>
#include <string.h> /* memset */
#include <string.h>
// Sine table for DAC DDS
#define SIN_LEN 512 // Length of a full wave. Table is 1/4 wave.
@ -57,11 +53,20 @@ INLINE uint8_t sinSample(uint16_t i) {
#define SPACE_FREQ 2200
#define SPACE_INC (uint16_t)(DIV_ROUND(SIN_LEN * (uint32_t)SPACE_FREQ, CONFIG_AFSK_DAC_SAMPLERATE))
// HDLC flag bytes
#define HDLC_FLAG 0x7E
#define HDLC_RESET 0x7F
#define AX25_ESC 0x1B
// Check that sample rate is divisible by bitrate
STATIC_ASSERT(!(CONFIG_AFSK_DAC_SAMPLERATE % BITRATE));
#define DAC_SAMPLESPERBIT (CONFIG_AFSK_DAC_SAMPLERATE / BITRATE)
//////////////////////////////////////////////////////
// Link Layer Control and Demodulation //
//////////////////////////////////////////////////////
static bool hdlcParse(Hdlc *hdlc, bool bit, FIFOBuffer *fifo) {
bool ret = true;
@ -124,6 +129,7 @@ static bool hdlcParse(Hdlc *hdlc, bool bit, FIFOBuffer *fifo) {
ret = false;
}
// Wipe received byte and reset bit index to 0
hdlc->currentByte = 0;
hdlc->bitIndex = 0;
@ -199,6 +205,10 @@ void afsk_adc_isr(Afsk *afsk, int8_t currentSample) {
}
}
//////////////////////////////////////////////////////
// Signal modulation and DAC //
//////////////////////////////////////////////////////
static void afsk_txStart(Afsk *af)
{
if (!af->sending)
@ -214,17 +224,12 @@ static void afsk_txStart(Afsk *af)
}
#define BIT_STUFF_LEN 5
#define SWITCH_TONE(inc) (((inc) == MARK_INC) ? SPACE_INC : MARK_INC)
/**
* DAC ISR callback.
* This function has to be called by the DAC ISR when a sample of the configured
* channel has been converted out.
*
* \param af Afsk context to operate on.
*
* \return The next DAC output sample.
*/
uint8_t afsk_dac_isr(Afsk *af)
{
@ -343,6 +348,9 @@ uint8_t afsk_dac_isr(Afsk *af)
return sinSample(af->phaseAcc);
}
//////////////////////////////////////////////////////
// File operation overwrites for read/write //
//////////////////////////////////////////////////////
static size_t afsk_read(KFile *fd, void *_buf, size_t size)
{
@ -414,6 +422,10 @@ static void afsk_clearerr(KFile *fd)
ATOMIC(af->status = 0);
}
//////////////////////////////////////////////////////
// Modem Initialization //
//////////////////////////////////////////////////////
void afsk_init(Afsk *afsk, int _adcPin, int _dacPin) {
// Allocate memory for struct
memset(afsk, 0, sizeof(*afsk));