https://devzone.nordicsemi.com/f/nordic-q-a/55935/uart-communication-stm32I am trying to program the Nordic nRF51822 MDBT40 Series module to communicate to an STM32 processor chip. The way I understand the procedure is as follows: First, I must flash the soft device to the module. I am not sure whether the correct versionen-USTelligent Community 13Fri, 27 Dec 2019 14:22:43 GMThttps://devzone.nordicsemi.com/thread/226943?ContentTypeID=1Fri, 27 Dec 2019 14:22:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a76fe0f9-f0f5-478e-96db-f675d9ba3a67Vidar Berg<p>Hi,</p> <p>Please take a look at the &quot;<a title="Compatibility matrix" href="https://infocenter.nordicsemi.com/topic/comp_matrix_nrf51/COMP/nrf51/nrf51_comp_matrix.html?cp=5_0">Compatibility matrix</a>&quot; to see what combinations of SDK and Softdevices you can use with your nRF51 chip.&nbsp;</p> [quote user=""]Is the soft device the only thing I need to flash to the bluetooth module to enable it to&nbsp;transmit to and receive data&nbsp;from the stm32 chip via a UART connection?[/quote] <p>&nbsp;You need to program an application to run on top of the softdevice. I think you may find the following links useful:</p> <p>-&nbsp; <a title="UART/Serial Port Emulation over BLE" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/ble_sdk_app_nus_eval.html?cp=7_5_8_4_2_2_19">UART/Serial Port Emulation over BLE</a>&nbsp;(example application available in nRF5 SDK)&nbsp;</p> <p>-&nbsp;&nbsp;<a title="Running examples that use a SoftDevice" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/getting_started_softdevice.html?cp=7_5_8_1_3">Running examples that use a SoftDevice</a></p><div style="clear:both;"></div>