nRF52840 Dongle UART

Question

Hello, 
 I use the Blinky example from the SDK. Now I would like to implement an UART on the nRF52840 Dongle. But the program always stops at either nrf_drv_uart_rx or nrf_drv_uart_tx. Can anyone help me with that? 
 Thanks in advance! 
 nrf_drv_uart_t upp_uart_inst = NRF_DRV_UART_INSTANCE(0);

void rm_uart_init()
{
 nrf_drv_uart_config_t vfg = NRF_DRV_UART_DEFAULT_CONFIG;
 cfg.baudrate = UART_BAUDRATE_BAUDRATE_Baud115200;
 cfg.hwfc = NRF_UART_HWFC_DISABLED;
 cfg.pselrxd = 29;
 cfg.pseltxd = 31;
 cfg.use_easy_dma= 0;
 
 nrf_drv_init(&app_drv_uart_init, &cfg, NULL);
}

void fkt()
{
 uint8_t tx_buffer[0] = 1;
 uint8_t rx_buffer[0] = 0;
 nrf_drv_uart_tx(&app_uart_inst, tx_buffer, 1);
 nrf_drv_uart_rx (&app_uart_inst, rx_buffer, 1);
}

Edvin · Accepted Answer

I got your file from the message. 
 
 First of all, you have a few redefined definitions. LED_3, LED_4. You should make sure that defines like these only have one value. They are already defined in pca10056.h. 
 I can't compile the project, because there are a lot of undefined variables and functions. I guess you have some custom files outside the project folder, or that you changed some of the default files in the SDK. Try to compile your project in a new unzipped, unmodified SDK, and you will see. 
 
 However, your project uses the UART as a log backend, so you can't use it in the application. If you need the UART in addition to logging, you need to disable the log, or change to RTT backend. 
 
 I suggest that you change to the following in sdk_config.h: 
 #define NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED 0 #define NRF_LOG_BACKEND_UART_ENABLED 0

nRF52840 Dongle UART

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