The question about CanBus Configure in the Model Based Software Design

[edenli]

Hi Guys,

I used the the Simulink Block of MPC5643L from NXP,I wanna use it to realize the CANbus comunicatin,the External crystals is 8MHz,The target of the Baud Rate is 500K:

 I use the CANalyzer to display the signal,but the Error shown as below:

My configure about the CanBus Configure shown as below:

My calculation about the Baud rate as below:

Baud Rate=8000,000/(Prescaler*(1+(PROP_SEG+PSEG1+2)+(PSEG2+1)));

So i fill in the parameter,Prescaler=1,PROP_SEG=5,PSEG1=5,PSEG2=2,

Is there some thing wrong about the calcaulation?

The attachment is the Simulink Model.

Original Attachment has been moved to: can_simple_block1.slx.zip

[dumitru-daniel_]

Hi edenli, 

Something is wrong with the formula. It's not working on my side neither. Why do you want to change the XTAL frequency ?

constantinrazvan.chivu‌,

Can you please add the formula used to compute the CAN baud-rate depending on all parameters in the Toolbox.

Thank you!

Daniel

[edenli]

Hi Daniel,

About the question ,Now i have solved it:smileyhappy:,but another question aomes again,i post it in a new topic ,haha,:smileygrin:,

If you have time to focus it

Best Regards!

Eden Li

[dumitru-daniel_]

How did you fix it ? Can you share the solution with us ? Where was the bottleneck ?

Thank you!

Daniel

[edenli]

Hi Daneil，

The XTAL in MPC5643L dual motor board is 8MHz,so i need to change it.But the Error i can not solve.