Error 195952641 on I2C, when power management is enabled.

RE: Error 195952641 on I2C, when power management is enabled.

Simon — Wed, 07 Jul 2021 12:07:35 GMT

[quote user="Kacper "]I haven't measured the current consumption, but will do this probably this week. [/quote]

If you measure a low current with everything inside twi_nrfx_pm_control() commented out then you have a workaround for this issue.

[quote user="Kacper "]I understand that its hard. Unfortunately I'm not able to connect logic analyzer to I2C lines, due to small size of components and the board itself. I was trying to do it, but with no luck. [/quote]

A logic trace would be very useful. I will see if I can get a hold of a LSM303 sensor and try to reproduce the issue on my side.

[quote user="Kacper "]When I use twim instead of twi, I can only communicate with one device (the LSM303 sensor shows as two devices on the bus), but when we used only accelerometer with twim, the problem didn't occur.[/quote]

The TWIM should be able to communicate with multiple slaves connected to the same bus, so I'm not sure what's going on.

I will wait for you current measurement results and look into the issue further if needed.

Best regards,

Simon

RE: Error 195952641 on I2C, when power management is enabled.

Kacper — Mon, 28 Jun 2021 07:25:21 GMT

I understand that its hard. Unfortunately I'm not able to connect logic analyzer to I2C lines, due to small size of components and the board itself. I was trying to do it, but with no luck.
I haven't measured the current consumption, but will do this probably this week.
When I use twim instead of twi, I can only communicate with one device (the LSM303 sensor shows as two devices on the bus), but when we used only accelerometer with twim, the problem didn't occur.

RE: Error 195952641 on I2C, when power management is enabled.

Simon — Fri, 25 Jun 2021 22:46:56 GMT

It's a little hard to debug since I don't have access to that sensor right now. Would you be able to attach a logic analyzer to the output to see what's going on?

By the way, if you comment out everything inside twi_nrfx_pm_control(), what current consumption do you see while in idle? I think the twi should release the HF clock after use automatically, so it shouldn't use too much power then I think.

Have you tried to use twim instead of twi? Do you see this issue then?

By the way, I'm going on vacation the next week, so I won't be able to provide you any answers next week.

RE: Error 195952641 on I2C, when power management is enabled.

Kacper — Wed, 23 Jun 2021 07:07:53 GMT

Changing power mode of sensor has no effect on this, the problem still occurs. I have found out that mocking function twi_nrfx_pm_control in i2c_nrfx_twi.c to do nothing resolves the problem, but then the I2C is not stopped when MCU goes into low power mode.

RE: Error 195952641 on I2C, when power management is enabled.

Simon — Tue, 22 Jun 2021 23:04:48 GMT

Let's try to narrow down the issue, what happens if you change the value of CONFIG_IIS2DH_POWER_MODE?

Take a look at <sample>/build/zephyr/.config to see the initial value.

Check out https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.1/kconfig/CONFIG_IIS2DH_POWER_MODE.html, to see the allowed values.

Best regards,

Simon