nRF51 DK mbed I2C/TWI

[Adrien C.]

Hi,

I'm currently building a BLE multi-sensors device, with mbed online IDE. I succeed in implementing BLE API, and releasing a first .hex firmware with multiple services and characteristics.

Now, I want to replace my fake characteristic values by sensor values.

I plug a BMP180 on my nRF51 dev board, with SCL and SDA connected to P0.24 and P0.25, but I don't know how to retrieve sensor values in order to broadcast them over BLE.

Any ideas on how to implement I2C communication to 77 address, and convert arduino library for mbed ?

[Hung Bui]

@Adrien C: According to this, by default the SCL, SDA pin are pin P0.07 and P0.30 respectively. As far as I remember you would need to modify the library a little bit to change the pins.

[Adrien C.]

Thanks, I will build my solution around a modified cube puck, thanks :)

[Haaris]

Anything so far??? I'm also trying to connect my raspi as master and nrf52 as slave using i2c but couldn't find anything on mbed except that nrf52 uses twi and as far as I know there aren't any libraries for twi in mbed

[Hung Bui]

Have you checked I2C ? TWI is another name of I2C. There should be a library for I2C on mbed.

[Haaris]

No nrf52 doesn't support mbed i2c libraries. But I used the sdk of nrf52 and used the TWI_SLAVE example as a reference and built my application on that. It finally works