8000 Check for PDMIn DMA getting stuck. by dhalbert · Pull Request #916 · adafruit/circuitpython · GitHub
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Check for PDMIn DMA getting stuck. #916

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Merged
merged 1 commit into from
Jun 8, 2018
Merged

Check for PDMIn DMA getting stuck. #916

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11 changes: 11 additions & 0 deletions ports/atmel-samd/common-hal/audiobusio/PDMIn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -392,7 +392,18 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
break;
}
// Wait for the next buffer to fill
uint32_t wait_counts = 0;
#ifdef SAMD21
#define MAX_WAIT_COUNTS 1000
#endif
#ifdef SAMD51
#define MAX_WAIT_COUNTS 6000
#endif
while (!event_interrupt_active(event_channel)) {
if (wait_counts++ > MAX_WAIT_COUNTS) {
// Buffer has stopped filling; DMA may have missed an I2S trigger event.
break;
}
#ifdef MICROPY_VM_HOOK_LOOP
MICROPY_VM_HOOK_LOOP
#endif
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