3 I2C bus with nRF52832

RE: 3 I2C bus with nRF52832

SwRa — Mon, 10 Jan 2022 16:40:57 GMT

Hi,

It should be possible to reconfigure the pins during runtime. You need to use the nrfx_twi(m) driver for this. Kindly take a look at this ticket (the same would work with TWI as long as the previous transfer is done before changing pins.)

Regards,

Swathy

RE: 3 I2C bus with nRF52832

embeddedER — Fri, 07 Jan 2022 17:50:23 GMT

Thanks Swathy for the reply.

Can we use 1 I2C instance for 1 Sensor as at a time and change the SDA/SCL lines at runtime?

Something like:

Connect sensors to different GPIOs for SDA-SCL.

Instantiate the I2C for first sensor with for first set of GPIOs, finish the transaction.

Instantiate the I2C for second sensor with for first set of GPIOs, finish the transaction.

Instantiate the I2C for third sensor with for first set of GPIOs, finish the transaction.

To do this we need to change the SDA/SCL lines at run time, I don't see an option to do it in 1.8.0 SDK.

RE: 3 I2C bus with nRF52832

SwRa — Fri, 07 Jan 2022 12:58:23 GMT

Hi,

Unfortunately that is not possible. Since the nrf52832 only has two TWI(M) instances, it can only have two sensors enabled at the same time. The nRF5340 is the only BLE chip we have that can support more than 2 TWI instances.

Kind Regards,

Swathy