Dynamically disable I2C

[John]

I'm using NCS V1.5.0 and an nRF52840

The current draw with I2C enabled is around 200 micro amps

If I disable I2C using an overlay and recompile the current draw is around 9 micro amps.

Unfortunately I require I2C, is there a way to disable and enable the interface at runtime under zephyr.

Help would be much appreciated.

[Stian Røed Hafskjold]

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)

[John]

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