uart issue esp32 and nRF52832

[ps_anu]

Hi... i am using nRF52832 ,15.2 version sdk . I want to send the data from esp32 to nRF52832 through Rx ,Tx . I have done connections rx,tx,gnd . I can able to transmit the data but i can't able to receive the data why ? i have used ble_app_uart examples , i didn't change anything , just inlcuded one data to print .

[Adev]

Could you show us how do you print data ? 

Did you tried to put some breakpoints ? 

On which uart are you connecting esp32 did you checked pins ? 

[ps_anu]

no ... esp32 is sending the data via using Serial.print() .. i am not receiving it , but i can transmit data  to the esp32 using printf

[Adev]

Did you checked RX_PIN_NUMBER, TX_PIN_NUMBER ?

[ps_anu]

nRF52832           esp32

8  pin Rx----->    Tx 17pin

6 pin  Tx ------>   Rx 16pin

[ps_anu]

even we tried communication between two nRF boards ,,, communiction is not working , same connection 8 pin Rx ----Tx 6pin and 6 pin Tx ---- 8 pin Rx ... i am not receiving any data from  one board to another

[Adev]

As you can see here : https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.0.0%2Fble_sdk_app_nus_eval.html, communication is done for the UART0 which is used for console output (all the prints that you can see on your terminal when connecting to board with usb cable), you can check if the RX_PIN_NUMBER, TX_PIN_NUMBER defined in your code is the same  as pin 8 , 6 to whom you are connecting.

[ps_anu]

  yes i checked same pin only i configured in program . then what is the problem . 

[Adev]

Did you tried these steps ? 

1. Connect the board to the computer using a USB cable. The board is assigned a COM port, which is visible in the Device Manager.
2. Start a terminal emulator like PuTTY and connect to the used COM port with the following UART settings:
   • Baud rate: 115.200
   • 8 data bits
   • 1 stop bit
   • No parity
   • HW flow control: None
3. Compile and program the application. Observe that the BSP_INDICATE_ADVERTISING state is indicated, and that the device is advertising with the device name "Nordic_UART".
4. Observe that the text "UART Start!" is printed on the COM listener running on the computer.
5. Connect to the device from nRF Connect. Observe that the BSP_INDICATE_CONNECTED state is indicated.
6. Observe that the services are shown in the connected device.
7. Select the UART RX characteristic value in nRF Connect. You can write hexadecimal ASCII values to the UART RX and get the text displayed on the COM listener.
8. Write '30 31 32 33 34 35 36 37 38 39' (the hexadecimal value for the string "0123456789") and click 'write'. Verify that the text "0123456789" is displayed on the COM listener.
9. For sending data from the device to nRF Connect, enter any text, for example, "Hello", on the COM listener. Observe that a notification with the corresponding ASCII values is sent to the peer on handle 0x12. For the string "Hello", the notification is '48 65 6C 6C 6F'

If it works that means that the problem is pin configuration. 

[ps_anu]

its working fine..then what problem