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hw status: Detect slow clock drift problems

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This commit is contained in:
Philippe Teuwen 2019-10-15 14:07:20 +02:00
commit c7d84ce239
1 changed files with 11 additions and 0 deletions
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11
armsrc/appmain.c
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@ -354,6 +354,17 @@ void SendStatus(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
Dbprintf(" Slow clock..............%d Hz", (16 * MAINCK) / mainf);
uint32_t delta_time = 0;
uint32_t start_time = GetTickCount();
#define SLCK_CHECK_MS 50
WaitMS(SLCK_CHECK_MS);
delta_time = GetTickCountDelta(start_time);
if ((delta_time < SLCK_CHECK_MS - 1) || (delta_time > SLCK_CHECK_MS + 1)) {
// error > 2% with SLCK_CHECK_MS=50
Dbprintf(_RED_(" Slow Clock speed change detected, TIA needed"));
Dbprintf(_YELLOW_(" Slow Clock actual speed seems closer to %d kHz"),
(16 * MAINCK / 1000) / mainf * delta_time / SLCK_CHECK_MS);
}
DbpString(_BLUE_("Installed StandAlone Mode"));
ModInfo();