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300 baud optimisations

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Mark Qvist 2019-04-11 16:29:32 +02:00
parent ede7b5c443
commit 73a1a28f96
2 changed files with 30 additions and 15 deletions
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23
hardware/AFSK.c
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@ -410,7 +410,18 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / IIR_GAIN;
afsk->iirY[0] = afsk->iirY[1];
afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] / IIR_POLE);
#elif FILTER_CUTOFF == 155
#define IIR_GAIN 6 // Really 5.99865959
#define IIR_POLE 2 // Really Y[0] * 0.6665921828
afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / IIR_GAIN;
afsk->iirY[0] = afsk->iirY[1];
afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] / IIR_POLE);
#elif FILTER_CUTOFF == 100
#define IIR_GAIN 9 // Really 8.763507115
#define IIR_POLE 0.77 // Really Y[0] * 0.7717808665
afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / IIR_GAIN;
afsk->iirY[0] = afsk->iirY[1];
afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] * IIR_POLE);
#else
#error Unsupported filter cutoff!
#endif
@ -422,7 +433,12 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / IIR_GAIN;
afsk->iirY[0] = afsk->iirY[1];
afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + (afsk->iirY[0] / IIR_POLE);
#elif FILTER_CUTOFF == 200
#define IIR_GAIN 9 // Really 8.763507115
#define IIR_POLE 2 // Really Y[0] * 0.7717808665
afsk->iirX[1] = ((int8_t)fifo_pop(&afsk->delayFifo) * currentSample) / IIR_GAIN;
afsk->iirY[0] = afsk->iirY[1];
afsk->iirY[1] = afsk->iirX[0] + afsk->iirX[1] + ((afsk->iirY[0] / 4) * 3);
#else
#error Unsupported filter cutoff!
#endif
@ -500,7 +516,7 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
afsk->currentPhase %= PHASE_MAX;
afsk->actualBits <<= 1;
uint8_t bits = afsk->sampledBits & 0x07;
if (bits == 0x07 || // 111
bits == 0x06 || // 110
@ -510,6 +526,7 @@ void AFSK_adc_isr(Afsk *afsk, int8_t currentSample) {
afsk->actualBits |= 1;
}
if (!hdlcParse(&afsk->hdlc, !TRANSITION_FOUND(afsk->actualBits), &afsk->rxFifo)) {
afsk->status |= 1;
if (fifo_isfull(&afsk->rxFifo)) {