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clarifications and minor changes in slow clock related operations:

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* SpinDelay and SpinDelayUs: now rounding applies instead of truncating
* Document maximum duration of SpinDelay/SpinDelayUs/BUTTON_CLICK/BUTTON_HELD
* Add argument check against max duration in SpinDelay/BUTTON_CLICK/BUTTON_HELD
* Document why these functions don't need to take wrapping into acount as in GetTickCountDelta
* Use >= in the spinning loops
* Clarify StartTickCount calibration operations and use masks AT91C_CKGR_MAINRDY and AT91C_RTTC_RTPRES
This commit is contained in:
Philippe Teuwen 2019-08-06 13:09:48 +02:00
commit 2cbe43f269
3 changed files with 35 additions and 11 deletions
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4
common/usb_cdc.c
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@ -446,9 +446,11 @@ AT91S_CDC_LINE_CODING line = { // purely informative, actual values don't matter
8 // 8 Data bits
};
// timer counts in 21.3uS increments (1024/48Mhz), rounding applies
// WARNING: timer can't measure more than 1.39s (21.3uS * 0xffff)
static void SpinDelay(int ms) {
int us = ms * 1000;
int ticks = (48 * us) >> 10;
int ticks = (48 * us + 512) >> 10;
// Borrow a PWM unit for my real-time clock
AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);