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Profanity
Visitor
July 26, 2026
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The LSM303AGR magnetometer fails to initialize

  • July 26, 2026
  • 2 replies
  • 80 views

The magnetometer doesn’t start over I2C and doesn’t output data via UART. Please help solve the problem; the files are attached.

Best answer by Dor_RH

Hello ​@Profanity,

I recommend referring to the LSM303AGR integration available in STM32CubeF4: Link (here)

2 replies

Dor_RHBest answer
ST Employee
July 27, 2026

Hello ​@Profanity,

I recommend referring to the LSM303AGR integration available in STM32CubeF4: Link (here)

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Dor_RH
    Andrew Neil
    Andrew Neil
    Super User
    July 27, 2026

    As ​@Dor_RH said, have you tried ST’s provided example?

    What hardware are you using?

     

    The magnetometer doesn’t start over I2C

    Have you checked hardware connections?

    Correct pullups?

    Correct slave address, and correctly presented in the software?

    Have you used an oscilloscope and/or logic analyser to see what’s actually happening on the bus?

     

    doesn’t output data via UART

    The LSM303AGR doesn’t have a UART.

     

     

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