RE: LSM6DSL problem to start via i2c

beliyd — Fri, 24 Aug 2018 14:09:15 GMT

Hi!

Thanks for reply!

Today I discovered a problem. I have two different power supply net on nrf52832 and LSM6DSL (with common ground) on my custom board. After connecting to one common power supply net, programm code work good.

RE: LSM6DSL problem to start via i2c

MartinBL — Fri, 24 Aug 2018 11:25:09 GMT

Do you have a logic analyzer that you can use to capture what goes on on the bus?

What happens if you remove the code reading from the who am I registers? The LSM6DSL's datasheet states that you need a repeated start condition between TX and RX operations and you don't have that. I'm not sure it if it is related though, and it is i odd that a read operation would work, but not subsequent write operations.

To use repeated start, please use:

nrf_drv_twi_tx(..., ..., ..., ..., true);

before

nrf_drv_twi_rx(..., ..., ..., ...);