OpenMV H7 Plus : problem with CAN Bus

OpenMV Products
1

Dear All,
I have a simple code sending a CAN Frame, the example one.
It works fine with CAM H7 and OpenMV CAN shield but not with H7 Plus.
the source code is the same and I can not see where is the problem.
The camera H7 Plus is powered with USB and other example are OK.
Best Regards,
Patrick from France.

2

Hi, are you running the latest firmware? The there is no difference between these boards in CAN code.

3

Hi,
Apparently yes, Micropython v1.13-r69 and HAL V1.9.0 for both camera

4

It could be the different clock…Do you set the same baudrate and sampling point ? What’s on the receiving end ?

CAN(2, CAN.NORMAL, baudrate=125_000, sampling_point=75)
5

It is exactly the same code with
can = CAN(2, CAN.NORMAL, baudrate=500_000, sampling_point=75)
CPU freq is the same (480, 240, 120, 120)
I suspect an Hardware problem, either in the camera itself or when I welded the connector to plug the shield but it seems OK.
Does anyone test the CAN bus with H7 Plus and or without the CAN shield ?

6

This morning I changed the receiver and it works both for H7 and H7 plus
I have to understand why it does not with the other receiver,
but the problem should not come from the H7 Plus.