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less checks in time critical loops

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iceman1001 2020-01-17 14:25:57 +01:00
commit f25beac361
1 changed files with 15 additions and 3 deletions
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18
armsrc/lfadc.c
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@ -22,7 +22,7 @@
// as a counting signal. TIMER_CLOCK3 = MCK/32, MCK is running at 48 MHz, so the timer is running at 48/32 = 1500 kHz // as a counting signal. TIMER_CLOCK3 = MCK/32, MCK is running at 48 MHz, so the timer is running at 48/32 = 1500 kHz
// Carrier period (T0) have duration of 8 microseconds (us), which is 1/125000 per second (125 kHz frequency) // Carrier period (T0) have duration of 8 microseconds (us), which is 1/125000 per second (125 kHz frequency)
// T0 = timer/carrier = 1500kHz/125kHz = 1500000/125000 = 6 // T0 = timer/carrier = 1500kHz/125kHz = 1500000/125000 = 6
#define T0 3 //#define HITAG_T0 3
////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////
// Global variables // Global variables
@ -52,9 +52,21 @@ size_t lf_count_edge_periods_ex(size_t max, bool wait, bool detect_gap) {
volatile uint8_t adc_val; volatile uint8_t adc_val;
//uint8_t avg_peak = 140, avg_through = 96; //uint8_t avg_peak = 140, avg_through = 96;
uint8_t avg_peak = 130, avg_through = 106; uint8_t avg_peak = 130, avg_through = 106;
int16_t checked = 0;
while (true) {
// only every 1000th times, in order to save time when collecting samples.
if (checked == 1000) {
if (BUTTON_PRESS() || data_available()) {
checked = -1;
break;
} else {
checked = 0;
}
}
++checked;
while (!BUTTON_PRESS()) {
// Watchdog hit
WDT_HIT(); WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {