How to know nRF52832 UART tx memory?

[Ferrell]

Hi, I'm using external board with nRF52832. (SDK 15.0.0)

In my external board, there are no RTS,CTS pin. So I don't use hardware flow control (HWFC).

The problem is, I have to flush tx memory when memory is full but I don't know how to check it.

I rarely use tx memory that flushing every sec or minute seems to waste of power.

How can I know that tx memory is full?

[Simon]

Could you provide some code of the program, in order to get a better understanding of your situation?

[Ferrell]

static void nus_data_handler(ble_nus_evt_t * p_evt)
{
		
    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
        NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);
				
						if(p_evt->params.rx_data.p_data[0]== '0')
						{
								nrf_gpio_pin_write(13,0);//turn off motor
						}
						else if(p_evt->params.rx_data.p_data[0]== '1')
						{
								if(nrf_gpio_pin_read(8))
								{
									nrf_gpio_pin_write(13,1); //Turn on motor
									pin8=true;
								}
								else if(nrf_gpio_pin_read(15))
								{		
									nrf_gpio_pin_write(13,1); //Turn on motor
									pin15=true;
								}
						}
					
    }
    
}

This above code is modified code from UART example.

I control motor through uart tx data ( 0: turn off , 1: turn on ) and now I want to add some more code.

When I add more code that use tx data, it cause error. ( Suddenly disconnect BLE )

So I think I have to flush tx fifo memory.

Am I missunderstanding??

Thanks for repling.