Always getting ERROR when reading MLX90393 data.

[bmak]

Hi,

I try to use MLX90393 with my STM32-F4 DISC board on SPI2.

I can communicate with it, read and write non volatile memory, he responds to me.

The steps that I'm doing are:

1. Go to Single Measurment mode ( 0x3F )
2. Send Read Measurment command ( 0x4F)
3. Read measurments and go back to step 1.

After SM command I get 0x23 status, which means that:

• I got into SM mode
• I have all bytes of data to receive

After RM command I get 0x33 status:

• I am in SM mode
• I GOT AN ERROR
• I have all bytes of data to receive

Then I tried exiting and reseting, which helps with an error bit, but then after writing RM command i again get an error.

Basically, I always get an error after RM command.

Here is what i have in registers of non volatile memory:

• REGISTER, 15-8 bit, 7-0 bit
• 0x00, 0x72, 0x7C
• 0x01, 0xC0, 0x00
• 0x02, 0x00, 0x05
• registers from 0x03 to 0x09 have 0x0000.

What am I doing wrong? What is causing this error?

My baud rate od SP2 is 562.5 KBits/s so I assume that it's not the high speed.

Here is a picture of what I get.

Maybe it looks normal, but the error bit worries me and data doesn't change when I manipulate with magnet.

Thanks for your help :).

 

[Eleon BORLINI · Accepted solution]

Hi @Maria Bąk​ ,

please note that the MLX90393 device is a Melexis (not ST) sensor, so I suggest you to refer to Melexis support.

If otherwise the issue is related to STM32 configuration, I added the related topics for getting more help.

-Eleon

[Eleon BORLINI]

Hi @Maria Bąk​ ,

were you able to solve the issue?

-Eleon

[bmak]

Sorry, but I didn't have time to sit back to it again. When I solve this, I will post my solution 🙂