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Re: [Paparazzi-devel] Aspirin v2.2 HMC data output FROZEN for IMU-MAG-RA

From: Felix Ruess
Subject: Re: [Paparazzi-devel] Aspirin v2.2 HMC data output FROZEN for IMU-MAG-RAW
Date: Thu, 23 Jul 2015 15:08:33 +0200


I haven't had this problem so far...
It would probably be good to read the status register as well and react accordingly to the RDY or LOCK bits...
Don't have time right now to look deeper into this (especially since I couldn't reproduce the problem).

In the meantime, could you plz test the following:
This will try to reconfigure the hmc if a transaction failed, not sure if a failed transaction is the problem though...

Otherwise it probably needs proper debugging with the black magic probe...

Cheers, Felix

On Tue, Jul 21, 2015 at 12:52 PM, banditniu <address@hidden> wrote:

Issue:  Aspirin v2.2 HMC data freezes after power-on
Description: After powering the IMU board, sometimes HMC58xx compass output
freezes. I have checked it by using IMU_MAG_RAW on telemetry/raw sensors

When the issue occurs I have also checked the other sensors on the board, it
seems IMU_ACCEL_RAW and IMU_GYRO_RAW are updated correctly.

*issue*  I'm now on v5.4.The error counter of telemetry for IMU_MAG_RAW is
not increasing, it performs like this in the MESSAGE :

After checking the HMC datasheet, I am suspicious about lock state of SR1
bit of HMC status register. Datasheet states that "When this bit is set, the
six data output registers are locked and any new data will not be placed".

I am still digging and try to solve this problem but I wonder that is the
issue board specific or has someone face an issue like that?


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