I2C doesn't work on nRF51822 MBED

[krul_serwisu]

Hello, I have a problem running nRF51822DK with temp. sensors while running BLE. I tried DS18B20 but it doesn't work at all, then TMP36 with ADC reading and as it works "as a standalone" without enabling BLE it gives false readings when BLE stuff is in the code. Same thing is with ADT7410. The library is working fine in basic example, but when I try to run it with BLE in a "custom gatt example" or similar it does not.

I've read that there are timing issues caused by clock change to 32kHz, but there has to be a proper way to run them both. I use MBED, Tom Kreyche / ADT7410 lib.

[Jørgen Holmefjord]

Could you provide some more details on what errors you are seeing? And some code showing how you use I2C and BLE?

[krul_serwisu]

This is the main file: www.dropbox.com/.../main.txt And I used that as a base: developer.mbed.org/.../30f6f65629b5

The problem is that when I add "ADT7410 tempSens1(p28, p27, 0x90, 100000);" declaration it compiles properly but BLE doesn't work.

[Jørgen Holmefjord]

Are you using the nRF51 DK? p27 is connected to the 32.768 kHz crystal and should not be used for I2C/TWI. Try changing the pin to 29 etc. In our SDK P0.07 and P0.30 is used for SDA and SCL.