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Use more defines when using main clock or master clock

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This commit is contained in:
Philippe Teuwen 2019-08-06 13:40:08 +02:00
commit 8b3159c83d
6 changed files with 11 additions and 8 deletions
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4
armsrc/ticks.c
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@ -13,7 +13,7 @@
// timer counts in 21.3uS increments (1024/48Mhz), rounding applies
// WARNING: timer can't measure more than 1.39s (21.3uS * 0xffff)
void SpinDelayUs(int us) {
int ticks = (48 * us + 512) >> 10;
int ticks = ((MCK / 1000000) * us + 512) >> 10;
// Borrow a PWM unit for my real-time clock
// This resets PWMC_CPRDR as well
@ -59,7 +59,7 @@ void StartTickCount(void) {
while ((AT91C_BASE_PMC->PMC_MCFR & AT91C_CKGR_MAINRDY) == 0); // Wait for MAINF value to become available...
uint16_t mainf = AT91C_BASE_PMC->PMC_MCFR & AT91C_CKGR_MAINF; // Get # main clocks within 16 slow clocks
// set RealTimeCounter divider to count at 1kHz, should be 32 if RC is exactly at 32kHz:
AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST | ((((16000000 / 1000 * 16) + (mainf / 2)) / mainf) & AT91C_RTTC_RTPRES);
AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST | ((((MAINCK / 1000 * 16) + (mainf / 2)) / mainf) & AT91C_RTTC_RTPRES);
// note: worst case precision is approx 2.5%
}