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Wake the main task on UART RX #11448

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Merged
dhalbert merged 1 commit into from
Sep 23, 2026
Merged

Wake the main task on UART RX #11448

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7 changes: 6 additions & 1 deletion ports/zephyr-cp/common-hal/busio/UART.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include "py/stream.h"

#include "bindings/zephyr_kernel/__init__.h"
#include "supervisor/port.h"

#include <stdatomic.h>
#include <string.h>
Expand Down Expand Up @@ -47,7 +48,11 @@ static void serial_cb(const struct device *dev, void *user_data) {
common_hal_busio_uart_clear_rx_buffer(self);
mp_sched_keyboard_interrupt();
} else if (!self->rx_paused) {
if (k_msgq_put(&self->msgq, &c, K_NO_WAIT) != 0) {
if (k_msgq_put(&self->msgq, &c, K_NO_WAIT) == 0) {
// Wake the main task so it can service the new RX data
// instead of sleeping out its full timeout.
port_wake_main_task_from_isr();
} else {
self->rx_paused = true;
}
}
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