From f21c5655835ba3703deeb1f0fa375d6a706b03cc Mon Sep 17 00:00:00 2001 From: iabdalkader Date: Fri, 10 Dec 2021 01:27:45 +0200 Subject: [PATCH] rp2/machine_uart: Handle and clear UART RX timeout IRQ. The pico-sdk 1.3.0 update in 97a7cc243b028833bdcb8ce0bc19b2bce7545851 introduced a change that broke RP2 Bluetooth UART, and possibly UART in general, which stops working right after UART is initialized. The commit raspberrypi/pico-sdk@2622e9b enables the UART receive timeout (RTIM) IRQ, which is asserted when the receive FIFO is not empty, and no more characters are received for a period of time. This commit makes sure the RTIM IRQ is handled and cleared in uart_service_interrupt. --- ports/rp2/machine_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ports/rp2/machine_uart.c b/ports/rp2/machine_uart.c index a8ec149f4b..887954276e 100644 --- a/ports/rp2/machine_uart.c +++ b/ports/rp2/machine_uart.c @@ -126,7 +126,7 @@ STATIC void uart_fill_tx_fifo(machine_uart_obj_t *self) { } STATIC inline void uart_service_interrupt(machine_uart_obj_t *self) { - if (uart_get_hw(self->uart)->mis & UART_UARTMIS_RXMIS_BITS) { // rx interrupt? + if (uart_get_hw(self->uart)->mis & (UART_UARTMIS_RXMIS_BITS | UART_UARTMIS_RTMIS_BITS)) { // rx interrupt? // clear all interrupt bits but tx uart_get_hw(self->uart)->icr = UART_UARTICR_BITS & (~UART_UARTICR_TXIC_BITS); if (!self->read_lock) {