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This commit is contained in:
iceman1001 2020-09-07 10:35:09 +02:00
commit 0be35a8e7e
33 changed files with 448 additions and 448 deletions
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40
armsrc/legicrf.c
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@ -101,27 +101,27 @@ static uint16_t rx_frame_from_fpga(void) {
//
// Note: inlining this function would fail with -Os
static bool rx_bit(void) {
int32_t sum_cq = 0;
int32_t sum_ci = 0;
int32_t sum_cq = 0;
int32_t sum_ci = 0;
// skip first 5 I/Q pairs
for(size_t i = 0; i<5; ++i) {
(void)rx_frame_from_fpga();
}
// skip first 5 I/Q pairs
for (size_t i = 0; i < 5; ++i) {
(void)rx_frame_from_fpga();
}
// sample next 8 I/Q pairs
for (uint8_t i = 0; i < 8; ++i) {
uint16_t iq = rx_frame_from_fpga();
int8_t ci = (int8_t)(iq >> 8);
int8_t cq = (int8_t)(iq & 0xff);
sum_ci += ci;
sum_cq += cq;
}
// sample next 8 I/Q pairs
for (uint8_t i = 0; i < 8; ++i) {
uint16_t iq = rx_frame_from_fpga();
int8_t ci = (int8_t)(iq >> 8);
int8_t cq = (int8_t)(iq & 0xff);
sum_ci += ci;
sum_cq += cq;
}
// calculate power
int32_t power = (MAX(ABS(sum_ci), ABS(sum_cq)) + (MIN(ABS(sum_ci), ABS(sum_cq)) >> 1));
// calculate power
int32_t power = (MAX(ABS(sum_ci), ABS(sum_cq)) + (MIN(ABS(sum_ci), ABS(sum_cq)) >> 1));
// compare average (power / 8) to threshold
// compare average (power / 8) to threshold
return ((power >> 3) > INPUT_THRESHOLD);
}
@ -136,12 +136,12 @@ static bool rx_bit(void) {
static void tx_bit(bool bit) {
// insert pause
HIGH(GPIO_SSC_DOUT);
HIGH(GPIO_SSC_DOUT);
last_frame_end += RWD_TIME_PAUSE;
while (GET_TICKS < last_frame_end) { };
// return to carrier on, wait for bit periode to end
LOW(GPIO_SSC_DOUT);
// return to carrier on, wait for bit periode to end
LOW(GPIO_SSC_DOUT);
last_frame_end += (bit ? RWD_TIME_1 : RWD_TIME_0) - RWD_TIME_PAUSE;
while (GET_TICKS < last_frame_end) { };
}