UART HW FLOW Control testing

[Justin_Yeh]

Hi Sir 

I enabled the "APP_UART_FLOW_CONTROL_ENABLED", but I measured the CTS / RTS pin always is low during data transmission. 

Is it normal ? How to check UART FLOW control is working or not ?

---------------------------------------------------------------------------

rmx_error uart_init(void)
{
uint32_t err_code;

const app_uart_comm_params_t comm_params =
{
UART_RX_PIN,
UART_TX_PIN,
UART_RTS_PIN,
UART_CTS_PIN,
APP_UART_FLOW_CONTROL_ENABLED, 
false,
#if defined (UART_PRESENT)
NRF_UART_BAUDRATE_115200
#else
NRF_UARTE_BAUDRATE_115200
#endif
};

APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_error_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code
);

APP_ERROR_CHECK(err_code);

}

[Simonr]

Yes, this is normal. You can try disabling the flow control by using the APP_UART_FLOW_CONTROL_DISABLED functionif you want to see what happens when flow control isn't enabled.

Best regards,

Simon

[Justin_Yeh]

enable & disable are the same, Is it normal ?