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Can protocol baud rate configuration issue

yuhui
Associate II

Hi all

  i use the stm32H735IGKx demo board,and would like to configure the can speed 500k. Below is my configuration:

yuhui_0-1717639425662.png

but i can't get the can data from the third party software at 500Kbps

yuhui_1-1717639557203.png

and when i use the oscilloscope, i have to configure 800Kbps that i can get the right information:

yuhui_2-1717639773552.png

 

 

and when i configured like below, i can get the right can data

yuhui_0-1717642163953.png

 

yuhui_1-1717642163455.png

 

 

yuhui_2-1717642163438.png

 

 

 

 

is there something wrong?

looking for experts' reply, many thanks.

1 ACCEPTED SOLUTION

Accepted Solutions
yuhui
Associate II

It seems the clock configuration problem

before, I used PLL2Q.  no matter how I changed the PLL2Q, it seems the clock is around 20MHz

after, I changed clock to PLL1Q, the problem solved and FDCAN module worked very well.

the reason I don't have time to find, maybe later.

yuhui_0-1718120703471.png

 

View solution in original post

1 REPLY 1
yuhui
Associate II

It seems the clock configuration problem

before, I used PLL2Q.  no matter how I changed the PLL2Q, it seems the clock is around 20MHz

after, I changed clock to PLL1Q, the problem solved and FDCAN module worked very well.

the reason I don't have time to find, maybe later.

yuhui_0-1718120703471.png