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Enable UART RX timeout IRQ, as well as RX IRQ, so that individual characters can be received.

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This commit is contained in:
Luke Wren
2021-07-09 11:44:40 +01:00
parent 9a586371db
commit 2622e9bc29
1 changed files with 7 additions and 2 deletions
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9
src/rp2_common/hardware_uart/include/hardware/uart.h
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@ -205,12 +205,17 @@ static inline void uart_set_format(uart_inst_t *uart, uint data_bits, uint stop_
* this function. * this function.
* *
* \param uart UART instance. \ref uart0 or \ref uart1 * \param uart UART instance. \ref uart0 or \ref uart1
* \param rx_has_data If true an interrupt will be fired when the RX FIFO contain data. * \param rx_has_data If true an interrupt will be fired when the RX FIFO contains data.
* \param tx_needs_data If true an interrupt will be fired when the TX FIFO needs data. * \param tx_needs_data If true an interrupt will be fired when the TX FIFO needs data.
*/ */
static inline void uart_set_irq_enables(uart_inst_t *uart, bool rx_has_data, bool tx_needs_data) { static inline void uart_set_irq_enables(uart_inst_t *uart, bool rx_has_data, bool tx_needs_data) {
// Both UARTRXINTR (RX) and UARTRTINTR (RX timeout) interrupts are
// required for rx_has_data. RX asserts when >=4 characters are in the RX
// FIFO (for RXIFLSEL=0). RT asserts when there are >=1 characters and no
// more have been received for 32 bit periods.
uart_get_hw(uart)->imsc = (bool_to_bit(tx_needs_data) << UART_UARTIMSC_TXIM_LSB) | uart_get_hw(uart)->imsc = (bool_to_bit(tx_needs_data) << UART_UARTIMSC_TXIM_LSB) |
(bool_to_bit(rx_has_data) << UART_UARTIMSC_RXIM_LSB); (bool_to_bit(rx_has_data) << UART_UARTIMSC_RXIM_LSB) |
(bool_to_bit(rx_has_data) << UART_UARTIMSC_RTIM_LSB);
if (rx_has_data) { if (rx_has_data) {
// Set minimum threshold // Set minimum threshold
hw_write_masked(&uart_get_hw(uart)->ifls, 0 << UART_UARTIFLS_RXIFLSEL_LSB, hw_write_masked(&uart_get_hw(uart)->ifls, 0 << UART_UARTIFLS_RXIFLSEL_LSB,