BLE not advertising when TWI pins are changed

[Vishnu Pradeep]

Hi devs,

I am working in an nRF52 DK. The attached example is not working when I change the SCL and SDA pins of TWI1 module. This is also not working if I disable TWI1 and enable TWI0!! The device doesn't get detected in nRF uart app or nRF connect apps. nRF5_SDK_11.0.0_MPU6050_Acc_X_Output.7z

I also tried the nrf5-mpu-simple program from this nrf5-mpu-examples-master.zip, which I got from github. please help.

thanks & regards, Vishnu

[Jørgen Holmefjord]

Hi,

Which pins did you try to change it to? Make sure that you use some pins not connected to other devices or componentes on the nRF52-DK. I see that SCL and SDA pins in your nrf_drv_config.h file is set to 0 and 1 for TWI0 interface. These pins are connected to the 32 kHz crystal on the DK board.

I tested changing the pins to 28 and 29, this seems to work just fine.

Best regards,

Jørgen

[Vishnu Pradeep]

I tried to change to 7 & 8 instead of 3 & 4 respectively which I now found that is connected to UART service. Thanks for sending the connection details.

[Jørgen Holmefjord]

As you can see in the documentation I linked above, pin 7 and 8 is used by the UART connected to the Interface MCU. You should select some other pins, for instance 22-31.

[Sri_guy]

Hi Vishnu, I saw your post. Did you get your system to work? I am using the MPU 6050 for my project. I tried using the github examples. When I tried to use the 'nrf5-ble-simple-mpu' and I believe it was advertising but I was not able to stream any data from either the terminal on my pc or from my phone either. I tried changing the pins to 28 and 29 but it did not seem to change anything.

[MartinBL]

Hi @Sri_guy. The UART (terminal) issue should be fixed now. I just pushed an update to git. Of some reason the example used the wrong UART library. Note that you have to be in a connection to see accelerometer values on the terminal.