BME280 error msg

[AMG]

I am running a Bme280 sensor with nrf9160 and getting this error msg ([1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0)while getting the actual sensor data.So it is working but also failing. It was pointed out that the problem might be in the overlay file so will be attaching it. I am running non secure.

 

&i2c2 {
    status = "ok";
    sda-pin = <12>;
    scl-pin = <11>;
    
    bme280@77 {
        compatible = "bosch,bme280";
        reg = <0x77>;
        label = "BME280";
    };
};

[Håkon Alseth]

Hi,

 

the error 195952641 is printed from this line:

https://github.com/NordicPlayground/fw-nrfconnect-zephyr/blob/master/drivers/i2c/i2c_nrfx_twim.c#L80

 

And corresponds to this error (address NACK):

https://github.com/NordicPlayground/fw-nrfconnect-hal_nordic/blob/master/nrfx/drivers/nrfx_errors.h#L68

 

How often do you sample the sensor, and how often do you see NACK errors? Have you tried scoping the analog signal to see if there's any issues with the voltage levels?

 

Kind regards,

Håkon

[AMG]

I tried sampling evey 1 sec and 5 sec both gives the same error. NACK is unpredictable there is no pattern. I test it with various voltage levels same error.

[Håkon Alseth]

How does the analog signal look on the bus? Are there any huge slopes when going from GND -> VDD on SCL and SDA?

 

Kind regards,

Håkon