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Merge pull request #8089 from furbrain/main 

Reset UART on deinit, reduces power consumption on nRF
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Dan Halbert 2023-06-20 19:48:37 -04:00 committed by GitHub
parent 4789508629 4bb475b930
commit 60adfa4e6b
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1 changed files with 7 additions and 0 deletions
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7
ports/nrf/common-hal/busio/UART.c
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@ -266,8 +266,15 @@ bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
}
void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
volatile uint32_t *power_cycle = (void *)(self->uarte->p_reg) + 0xFFC;
if (!common_hal_busio_uart_deinited(self)) {
nrfx_uarte_rx_abort(self->uarte);
nrfx_uarte_tx_abort(self->uarte);
nrfx_uarte_uninit(self->uarte);
// power cycle the peripheral as per https://devzone.nordicsemi.com/f/nordic-q-a/26030/how-to-reach-nrf52840-uarte-current-supply-specification/102605#102605
*power_cycle = 0;
*power_cycle;
*power_cycle = 1;
reset_pin_number(self->tx_pin_number);
reset_pin_number(self->rx_pin_number);
reset_pin_number(self->rts_pin_number);