UART communication without CTS RTS.

[Bayram ZAYET]

Hello,

I am using nRF51822 and an STM32 communicating over UART. I want to test UART communication without CTS and RTS so I did the configuration as shown below:

static void uart_init(void) {

uint32_t                     err_code;
const app_uart_comm_params_t comm_params =
{	
BLE_USART_RX_PIN_NUMBER,
BLE_USART_TX_PIN_NUMBER,
    BLE_USART_RTS_PIN_NUMBER,
    BLE_USART_CTS_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED,	
    false,
UART_BAUDRATE_BAUDRATE_Baud115200,
};

APP_UART_FIFO_INIT( &comm_params,
                   UART_RX_BUF_SIZE,
                   UART_TX_BUF_SIZE,
                   uart_event_handle,
                   APP_IRQ_PRIORITY_HIGH, // APP_IRQ_PRIORITY_LOW
                   err_code);
APP_ERROR_CHECK(err_code);

}

Can you confirm my changes especially that I got no communication between them once I disable UART flowcontrol.

regards,

[Sigurd]

Hi,

In order to not use CTS/RTS you only need to use APP_UART_FLOW_CONTROL_DISABLED as you have done. Did you remember to turn off the flow-control on the STM32 ?

[Bayram ZAYET]

Hello,

Yes I changed it to APP_UART_FLOW_CONTROL_DISABLED but I had to change my: BLE_USART_RTS_PIN_NUMBER, BLE_USART_CTS_PIN_NUMBER, both to NULL. and now it works .

Regards,