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run background tasks during multi-part DMA #7701

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Merged
merged 1 commit into from
Mar 9, 2023
Merged

run background tasks during multi-part DMA #7701

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9 changes: 8 additions & 1 deletion ports/atmel-samd/common-hal/busio/SPI.c
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Original file line number Diff line number Diff line change
Expand Up @@ -271,10 +271,17 @@ bool common_hal_busio_spi_write(busio_spi_obj_t *self,
size_t bytes_remaining = len;

// Maximum DMA transfer is 65535
while (bytes_remaining > 0) {
while (1) {
size_t to_send = (bytes_remaining > 65535) ? 65535 : bytes_remaining;
status = sercom_dma_write(self->spi_desc.dev.prvt, data + (len - bytes_remaining), to_send);
bytes_remaining -= to_send;
if (bytes_remaining > 0) {
// Multi-part transfer; let other things run before doing the next chunk.
RUN_BACKGROUND_TASKS;
} else {
// All done.
break;
}
}
} else {
struct io_descriptor *spi_io;
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