Reading I2C returns a empty bytearray

QuecPython
1

Hi, I’m trying to get sensor data from a sensor connected to a UMTS&LTE EVBs J804 i2c pins. All i get back is a empty array. Any idea on what the problem could be? We are using the bg95-m3 module.

QuecPython code can be found in the link below.
main.py (1.8 KB)

Any help is highly appreciated!

Oscar

2

hi~,Oscar_H

May i ask which firmware version are you using?

I tested with the latest firmware and I2C worked fine

My firmware version is QPY_OCPU_V0001_BG95M3_FW

3

I have downloaded the latest version (V001) from the download zone, when I run modem.getDevFwVersion() I get following response
BG95M3LAR02A03_BETA1204_31.200.31.200_BETA1204

4

Yes，this is the latest firmware and the issue should not be kernel-related.

But I do not have the corresponding I2C slave. Let me take a look at the datasheet to make sure there are no other problems with the configuration.

5

I’ve changed the register address to bytearray(0x00) since the slave doesn’t have a specified register address.

6

Yes, the register address needs to be changed to 0x00.
Can the module read the value after the register address is changed to 0?

7

I recommend that you can print the return value of the read/write function to confirm that the return is normal

8

I’ve done that, both read and write returns 0.

9

Could you grab a waveform with the oscilloscope?

Let’s analyze the waveform

10

Please try this script to check if the module can read the data

test.py (1.5 KB)

11

I made basically those changes earlier. Turned out that the main issue I had left was on the hardware side, now that I moved the sensor and resistors to a breadboard everything is working as it should.

Thank you for your time!