about uart interrupt callback and mobile phone receive data in nRF52810

[tony55723]

Sorry Nordic engineers , I'm asking urgently , goods need to come out quickly

chip：nRF52810

SDK：nRF5_SDK_15.0.0_a53641a

examples：ble_peripheral \ ble_app_uart

external chip (UART Tx) ---> (UART Rx) nRF52810 (BLE) ---> mobile phone

【1】This example should not have UART interrupt callback ? How should I add it ? ( If you can, the details can not be specific. ) 

【2】Function【static void nus_data_handler (ble_nus_evt_t * p_evt) 】，this should be the transfer of data to the mobile phone

Parameter (p_evt) is pointer , should it be associated in the interrupt callback?

【3】Mobile phone APP must be opened 【Notify】, then nRF52810 can send data , so these three conditions can achieve the function I want to achieve?

Thanks

[howard n2wx]

Hi Tony,

[1] See uart_event_handle() in that example's main.c for the UART receiver. It's called with an APP_UAR_DATA_READY event when the UART receives data.  

[2] nus_data_handler handles data going in the opposite direction, from the mobile phone ----> BLE ---> nRF52810

[3] How to do this depends on the app.  The nRF Connect Android app allows you to connect and turn notifications on. Your own Android app will need to do something like this:

       // If nordic nus device
        if (UUID_NRF_UART_SERVICE.equals(characteristic.getUuid())) {
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                    UUID.fromString(CLIENT_CHARACTERISTIC_CONFIG));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);
        }

in BluetoothLeService.java's setChaacteristicNotification function

Best Regards, Howard

[tony55723]

Thank you for answer , but I have some questions.

【1】Board power on ,  UART Debug tool can print 【UART Started】 , but send data , inability to enter uart_event_handle() (callback) , is enable need to open, or other settings?

【2】UART Debug tool can print the data from the phone ,  if enter uart_event_handle() , this function ble_nus_data_send() is send data to mobile phone ?

【3】Want to receive data from nRF52810 , mobile phone only needs to open the notify ,  other things should not be done?

[howard n2wx]

Do the pin assignments in uart_init() match your configuration? If you are using for ex one of the nice Fanstel modules you may need to change off the default pins.

[tony55723]

This is my circuit diagram

The other question, I don't think it should be.

The previous code picture, case APP_UART_DATA:

After power on, the system continues to execute the printf in the code.

The entry condition for function uart_event_handle should be external data.

Is my idea right?

[howard n2wx]

Try it with RX_PIN_NUMBER  9 .   The pin assignments follow the GPIO numbering convention rather than the package pins (see https://devzone.nordicsemi.com/f/nordic-q-a/9837/problems-with-spi-on-nrf52-no-signal)

>After power on, the system continues to execute the printf in the code.

An RX pin assignment change may help. The event might be a framing error or something unexpected.

> The entry condition for function uart_event_handle should be external data.

For receive data that's correct

[tony55723]

Thank you so mush , i've been stuck with this problem for two days.

I always thought I wanted to correspond to the number (Pin 2 =  p0.00 ..........)

Your answer is very fast, really, thank you

[howard n2wx]

You're welcome. I'm happy it helped you.