RE: switch UART pins at runtime

Jared — Thu, 21 Dec 2023 10:08:24 GMT

Great,

Thanks for sharing your implementation,

regards

Jared

RE: switch UART pins at runtime

mkoniarz — Thu, 21 Dec 2023 07:41:01 GMT

I managed to do this way:

#define UARTE_MODE_RS232 0

#define UARTE_MODE_RS485 1

#define UARTE_RS232_RX_PIN 23

#define UARTE_RS232_TX_PIN 22

#define UARTE_RS485_RX_PIN 25

#define UARTE_RS485_TX_PIN 27

#define UARTE_RS485_RXTX_PIN 26

void uarte_init(uint8_t mode) {
	nrfx_uarte_config_t uarte_config = NRFX_UARTE_DEFAULT_CONFIG(UARTE_RS232_TX_PIN,UARTE_RS232_RX_PIN);
	if(uarte_initialized) {
		nrfx_uarte_uninit(&uarte_instance);		
		uarte_initialized=0;
	}
	uarte_config.cts_pin = NRF_UARTE_PSEL_DISCONNECTED;
	uarte_config.rts_pin = NRF_UARTE_PSEL_DISCONNECTED;	
	uarte_mode = mode;
	uarte_config.baudrate = UARTE_BAUDRATE_BAUDRATE_Baud115200;
	uarte_config.p_context = &uarte_instance;
	if(mode == UARTE_MODE_RS232) {
		uarte_config.rxd_pin = UARTE_RS232_RX_PIN;
		uarte_config.txd_pin = UARTE_RS232_TX_PIN;
	} else if(mode == UARTE_MODE_RS485) {
		uarte_config.rxd_pin = UARTE_RS485_RX_PIN;
		uarte_config.txd_pin = UARTE_RS485_TX_PIN;
		nrf_gpio_cfg_output(UARTE_RS485_RXTX_PIN);
		nrf_gpio_pin_clear(UARTE_RS485_RXTX_PIN);
	} else {
		return;
	}
	#if defined(__ZEPHYR__)
    	IRQ_DIRECT_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_UARTE_INST_GET(UARTE_INST_IDX)), IRQ_PRIO_LOWEST,
        	               NRFX_UARTE_INST_HANDLER_GET(UARTE_INST_IDX), 0);
	#endif
	if(nrfx_uarte_init(&uarte_instance, &uarte_config, uarte_callback) == NRFX_SUCCESS) {
		uarte_initialized=1;
	}
	nrfx_uarte_rx(&uarte_instance,uarte_rx_buffer, UART_RXTX_BUFFER_SIZE);
	rx_in_progress = 1;
}

RE: switch UART pins at runtime

Jared — Tue, 19 Dec 2023 13:52:59 GMT

Hi,

This is a bit tricky but I think you need to use the nrfx driver correctly for this to work.

For example try to call the nrfx_uart_reconfigure() with the new configuration struct.

See this answer for more,

I see that Zephyr has introduced device multiplexing, but I couldn't find any example on it.

regards

Jared