I2C sensor with additional CS/power pins

RE: I2C sensor with additional CS/power pins

Paskin — Mon, 24 Jul 2023 12:23:01 GMT

Ok,

Managed to achieve the desired result using gpio-hogs.

Got a suggestion - throw a warning when, for example, gpio_hogs are defined in DT - but CONFIG_GPIO_HOGS is not set. Otherwise it can take ages to figure what is going wrong...

Thanks!

RE: I2C sensor with additional CS/power pins

Paskin — Thu, 20 Jul 2023 12:24:10 GMT

Unfortunately - I do not have an analyzer.

SDA is P0.29, SCL is P0.02.
CS (which has to be "1" for I2C) - wired to P0.03 without any external pull. SA0 - wired to P0.28 the same way.

My question relates to a "by the book" scenario - before dealing with potential issues, what is the correct way to set CS and SA0 to the expected state before Zephyr Lps22hb driver will try to access the device as a part of its initialisation?

From the power perspective - the sensor is hardwired to a Vcc/Gnd.

RE: I2C sensor with additional CS/power pins

Simonr — Thu, 20 Jul 2023 10:59:43 GMT

What GPIOs are you using from the nRF52832 to connect to the LPS22hB sensor? And are you certain that the sensor is powered at all? Do you have a logic analyzer or similar to see if there's any activity at all between the nRF52 and the LPS22HB?

Best regards,

Simon