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This commit is contained in:
Mark Qvist 2014-04-06 20:26:24 +02:00
parent b4de1f73ea
commit 19cca9487a
6 changed files with 66 additions and 26 deletions
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9
Modem/afsk.c
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@ -336,7 +336,12 @@ void afsk_adc_isr(Afsk *afsk, int8_t currentSample) {
// Signal modulation and DAC //
//////////////////////////////////////////////////////
// Defines how many consecutive ones we send
// before we need "stuff" in a zero
#define BIT_STUFF_LEN 5
// A macro for switching what tone is being
// synthesized by the DAC.
#define SWITCH_TONE(inc) (((inc) == MARK_INC) ? SPACE_INC : MARK_INC)
static void afsk_txStart(Afsk *afsk) {
@ -352,7 +357,7 @@ static void afsk_txStart(Afsk *afsk) {
ATOMIC(afsk->tailLength = DIV_ROUND(CONFIG_AFSK_TRAILER_LEN * BITRATE, 8000));
}
// This is the DAC ISR, called at sampling ratewhenever the DAC IRQ is on.
// This is the DAC ISR, called at sampling rate whenever the DAC IRQ is on.
// It modulates the data to be transmitted and returns a value directly
// for output on the DAC
uint8_t afsk_dac_isr(Afsk *afsk) {
@ -444,7 +449,7 @@ uint8_t afsk_dac_isr(Afsk *afsk) {
//////////////////////////////////////////////////////
// File operation overwrites for read/write //
// File operation functions for read/write //
// These functions make the "class" act like a file //
// pointer, which can be read from or written to. //
// Handy for sending and receiving data :) //