https://devzone.nordicsemi.com/f/nordic-q-a/99313/uart-communication-error-when-the-data-is-sentIt is supposed to communicate with stm32 and uart. When data comes into rx (to ble), app_uart_get is used, but an error occurs once when data is transmitted in it, so the data does not come in properly. 1. stm32 uart setting =&gt; flow control disableden-USTelligent Community 13Wed, 03 May 2023 13:23:35 GMThttps://devzone.nordicsemi.com/thread/423576?ContentTypeID=1Wed, 03 May 2023 13:23:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e17e9b4a-bf47-4aec-84cd-870775af5206Einar Thorsrud<p>Hi,</p> <p>Is it so that the driver on the nRF side reports an error? If so, you should get the value of the <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52833/uarte.html?cp=5_1_0_5_31_8_20#register.ERRORSRC">ERRORSRC</a>&nbsp;and can compare that with the register description to know more about what happened.</p> <p>Before knowing that, I have some questions:</p> <ul> <li>Does this always happen in the same way?</li> <li>Can you say more about your configuration (Like the values of the defines you pass to&nbsp;APP_UART_FIFO_INIT)?</li> <li>Did you start the HFXO before doing UART? (That is not always needed and may not be needed here, though with higher baud rates and longer&nbsp;transactions it becomes more and more important).</li> <li>Do you use the UARTE (with DMA) or UART peripheral?</li> <li>Is it possible on your HW to use flow control? If the applciation&#39;s on both sides are not always ready to receive data over UART, that will make the communication much more robust.</li> </ul><div style="clear:both;"></div>