[craigbeal]

in reply to: Missing information on MPU Digital Inputs #18460

Hi Sandeep,

I believe that most of this information was previously available via the Input/Output page. However, I still do not see any info about the GPIO pins on the MPU, which was my specific need. Thanks in advance.

[craigbeal]

in reply to: No data from CM4 ADC chip SPI #15604

OK, that all makes sense. Confirmed the same behavior (SPI returning 0xFF on both bytes of all channels) on both CM4 boards plugged into the same FlexCase chassis (either chassis). The chassis is not connected to anything when doing this text. The boot config file matches (for an FCS1.1 with CM4). SPI works fine when pulling data from the IMU chip. Next steps?

• This reply was modified 1 year, 5 months ago by craigbeal.

[craigbeal]

in reply to: No data from CM4 ADC chip SPI #15600

Can you post a valid /boot/config.txt for reference?

I’ve uploaded the current Empty_Project to the MCU after commenting out the MCU-MPU SPI transmission blocks and building it. I used the r1.5 samples, which seems to be different by one line in the System Start block, but I’m not quite sure what “RCM->RPC = 0x1002” does in this context. Other than that, the MCU should not be transmitting, and the MPU is not requesting data over SPI.

On the MPU side, I did use the two CM4’s in their own individual FlexCase chassis as opposed to swapping them. I had made an ADC check python script very similar to yours (except with the loop unrolled) and I was not seeing anything on any channel, other than the fact that one system gave me all high bytes over SPI (0xFF) and the other gave me all low (0x00). I’ll give the swapping CM4’s a try.

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