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rp2/machine_uart: Handle and clear UART RX timeout IRQ. 

The pico-sdk 1.3.0 update in 97a7cc243b
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.
pull/8096/head
iabdalkader 2021-12-10 01:27:45 +02:00 zatwierdzone przez Damien George
rodzic 5adb1fa40e
commit f21c565583
1 zmienionych plików z 1 dodań i 1 usunięć
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ports/rp2/machine_uart.c
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@ -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) {