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fix lost DMA IRQ

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This commit is contained in:
Jeff Epler 2022-04-19 16:42:27 -05:00
parent ebc426d9e6
commit 144eb5dfd4
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GPG Key ID: D5BF15AB975AB4DE
1 changed files with 5 additions and 1 deletions
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6
ports/raspberrypi/audio_dma.c
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@ -448,6 +448,11 @@ void isr_dma_0(void) {
if ((dma_hw->intr & mask) == 0) { if ((dma_hw->intr & mask) == 0) {
continue; continue;
} }
// acknowledge interrupt early. Doing so late means that you could lose an
// interrupt if the buffer is very small and the DMA operation
// completed by the time callback_add() / dma_complete() returned. This
// affected PIO continuous write more than audio.
dma_hw->ints0 = mask;
if (MP_STATE_PORT(playing_audio)[i] != NULL) { if (MP_STATE_PORT(playing_audio)[i] != NULL) {
audio_dma_t *dma = MP_STATE_PORT(playing_audio)[i]; audio_dma_t *dma = MP_STATE_PORT(playing_audio)[i];
// Record all channels whose DMA has completed; they need loading. // Record all channels whose DMA has completed; they need loading.
@ -458,7 +463,6 @@ void isr_dma_0(void) {
rp2pio_statemachine_obj_t *pio = MP_STATE_PORT(continuous_pio)[i]; rp2pio_statemachine_obj_t *pio = MP_STATE_PORT(continuous_pio)[i];
rp2pio_statemachine_dma_complete(pio, i); rp2pio_statemachine_dma_complete(pio, i);
} }
dma_hw->ints0 = mask;
} }
} }