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add: USB Speed Test to hw status

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fix: choose Real Time Clock divider based on actual slow clock frequency
This commit is contained in:
pwpiwi 2015-07-29 18:52:43 +02:00
parent da721c6b30
commit bfb01844fb
4 changed files with 59 additions and 19 deletions
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11
armsrc/util.c
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@ -304,11 +304,12 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
void StartTickCount()
{
// must be 0x40, but on my cpu - included divider is optimal
// 0x20 - 1 ms / bit
// 0x40 - 2 ms / bit
AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST + 0x001D; // was 0x003B
// This timer is based on the slow clock. The slow clock frequency is between 22kHz and 40kHz.
// We can determine the actual slow clock frequency by looking at the Main Clock Frequency Register.
uint16_t mainf = AT91C_BASE_PMC->PMC_MCFR & 0xffff; // = 16 * main clock frequency (16MHz) / slow clock frequency
// set RealTimeCounter divider to count at 1kHz:
AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST | ((256000 + (mainf/2)) / mainf);
// note: worst case precision is approx 2.5%
}
/*