RE: I2C reads/writes: How to communicate with a 7bit I2C slave that has a 16bit memory map?

cor10 — Thu, 18 Nov 2021 23:19:59 GMT

Hi Jared. I had initially started with that commented out approach, but moved to the uncommented approach above because it wasnt working at first. I now realize I had a very small bug that was a result of copy/pasting the function skeleton from my previous 8bit implementation. For anyone looking at this post, the bug was in the line nrf_drv_twi_xfer_desc_t xfer = NRF_DRV_TWI_XFER_DESC_TX(slaveAddr, buffer, length + 1); where I was inputting length + 1 erroneously instead of length +2 to account for the 2bytes of the 16bit register address instead of just the 1byte for the 8bit register addresses.

RE: I2C reads/writes: How to communicate with a 7bit I2C slave that has a 16bit memory map?

Jared — Wed, 17 Nov 2021 16:01:43 GMT

Hi there,

The write code that is commented out looks ok. Could you try that one? I think the secondary buffer are ignored on a normal TX.

regards

Jared