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Merge pull request #4155 from jepler/rpi-pio-background 

rp2pio: Transfer up to 32 bytes before checking background tasks
This commit is contained in:
Dan Halbert 2021-02-08 16:34:16 -05:00 committed by GitHub
parent f171660870 5423e4966c
commit b0ed258302
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 9 deletions
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26
ports/raspberrypi/common-hal/rp2pio/StateMachine.c
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@ -546,15 +546,23 @@ static bool _transfer(rp2pio_statemachine_obj_t *self,
size_t tx_remaining = out_len;
while (rx_remaining || tx_remaining) {
if (tx_remaining && !pio_sm_is_tx_fifo_full(self->pio, self->state_machine)) {
*tx_destination = *data_out;
data_out++;
--tx_remaining;
}
if (rx_remaining && !pio_sm_is_rx_fifo_empty(self->pio, self->state_machine)) {
*data_in = (uint8_t) *rx_source;
data_in++;
--rx_remaining;
for (int i=0; i<32; i++) {
bool did_transfer = false;
if (tx_remaining && !pio_sm_is_tx_fifo_full(self->pio, self->state_machine)) {
*tx_destination = *data_out;
data_out++;
--tx_remaining;
did_transfer = true;
}
if (rx_remaining && !pio_sm_is_rx_fifo_empty(self->pio, self->state_machine)) {
*data_in = (uint8_t) *rx_source;
data_in++;
--rx_remaining;
did_transfer = true;
}
if (!did_transfer) {
break;
}
}
RUN_BACKGROUND_TASKS;
if (mp_hal_is_interrupted()) {