Dynamically disable I2C

RE: Dynamically disable I2C

John — Tue, 02 Mar 2021 00:15:35 GMT

Thanks very much for your advice. It helped me understand that I should be actually shutting down the transport mechanism, not the "traffic on the road".

RE: Dynamically disable I2C

John — Mon, 01 Mar 2021 21:50:23 GMT

Thanks very much for your reply.

I've tried that approach.

As follows:

I've used DEVICE_PM_FORCE_SUSPEND_STATE as well as DEVICE_PM_OFF_STATE Same result.

void st_lis2dh_stop(void) {
int err;
k_sleep(K_MSEC(2));
err = device_set_power_state(sensor_accelerometer, DEVICE_PM_FORCE_SUSPEND_STATE, NULL, NULL);
if (err) {
printk("Can't power off st_lis2dh %d \n", err);
}
}

I get the following at run time.

Can't power off si7055_sensor -35
Can't power off st_lis2dh -35

RE: Dynamically disable I2C

Stian Røed Hafskjold — Mon, 01 Mar 2021 21:18:46 GMT

Hi, can you please check out my answer here about using the power management API:

https://devzone.nordicsemi.com/f/nordic-q-a/69534/thingy91-power-consumption/286010#286010

It's about uart1 and logging, but you should be able to follow the same principle for the i2c0 (or i2c1)