The MPU9250 magnetometer ID reading does not get the correct value for the following reasons:

shijizai

The MPU9250 magnetometer ID reading does not get the correct value for the following reasons: [Copy link]

I just made a note of the pit I just jumped out of, so as not to forget it later.

The MPU9250 magnetometer ID reading does not get the correct value for the following reasons:

Here is the IIC address of the magnetometer (0x0C). In the register manual, you can find the magnetometer device address register (0x00) and the device address (0x48).

Phenomenon: When reading the register, the correct address value should be 0x48. Here, the reading error is 0xff. At the same time, when reading the ID value of MPU9250, the result is correct.

Cause & Solution: Note the yellow highlighted part in the above picture. The manual says IIC mode is "Pass-Through mode". Pull down the INT pin to enable Pass-Through mode. At the same time, you need to write register 0x6A to disable IIC master mode. Then read it again to get the correct ID.

soso

Praise the good habit of recording

freebsder

Many manuals are very confusing. If you don't read carefully, you can't see the details at all, and even if you read carefully, you still can't understand them for a while.

shijizai

freebsder posted on 2020-11-24 13:12 Many manuals are very confusing. If you don't read carefully, you won't see the details at all. If you read carefully, you won't understand them for a while.

Haha, yes