What should I do in NRF 52832 to enable RS485 communication?

[getItem]

Hi.

I have a problem with using RS485 (ISO-3082DWR) from NRF-52832.

The SDK version uses 15.02.

Here's the code I've run.

    nrfx_uart_config_t uart_config =

    {
        .pseltxd = 30,
        .pselrxd = 31,
        .pselcts = 19,
        .pselrts = 18,
        .p_context = NULL,
        .hwfc = NRF_UART_HWFC_DISABLED, // Flow Control - Not Use
        .parity = NRF_UART_PARITY_EXCLUDED, // Parity - Not Included
        .baudrate = UARTE_BAUDRATE_BAUDRATE_Baud19200,
        .interrupt_priority = NRFX_UART_DEFAULT_CONFIG_IRQ_PRIORITY

    };

    // TWI_INSTACE_ID Already defined 0
    nrfx_uart_t uart = NRFX_UART_INSTANCE (TWI_INSTANCE_ID);
  
     nrfx_err_t err;
     err = nrfx_uart_init (& uart, & uart_config, nrfx_uart_event_handler);

    // flow control - write
    nrf_gpio_cfg_output (18);
    nrf_gpio_cfg_output (19);


    nrf_gpio_pin_write (18, 1);
    nrf_gpio_pin_write (19, 1);

    while (true)
    {

        int8_t ch = 'b';
        err = nrfx_uart_tx (& uart, & ch, 1);
        nrfx_uart_tx_abort (& uart);
        nrf_delay_ms (100);
    }

I have processed the following code, but I do not get any signals. Is there a problem with the code?

Or do I have to look through another example?

[Jørgen Holmefjord]

Hi,

Why do you call nrfx_uart_tx_abort immediately after nrfx_uart_tx? The UART driver operates in non-blocking mode, meaning that calling nrfx_uart_tx will only setup the transfer before returning, the transfer itself will not have completed until you get the event in the event handler. If you call abort, you will terminate the transfer before it has started.

Best regards,
Jørgen