CMU Fault injection MPC5744P

[Mennazz]

I'm attempting to inject a fault into the CMU by setting the HFREFR and LFREFR register values to wrong values, however the CMU_ISR value is always zero.

[petervlna]

Hello,

I have got this example from application team, which is demonstrating ADC CMU.

You can give it a try,

Best regards,

Peter

[Mennazz]

Hello, Peter. 
The ISR is triggered successfully for CMU_1 and CMU_2. I used the same approach for CMU3 and CMU_0, but it didn't work. 
Let me explain more. 
CMU_0 desired frequency is

 so I set the HFREFR to 0x1a0 and the LFREFR to 60 to trigger the ISR but it didn't work 

[petervlna]

Hello,

Hard to say. But , could you confirm your ADC / PWMs are running?

Both are cumming from AUX0

 

Best regards,

Peter

[Mennazz]

Yes they are both running

[petervlna]

Hello,

Hmm so you still see CMU ISR not set

Only thing which can prevent set up of flag is the monitor is not enabled.

I am bit confused of this whole thing as it is strait forward.

Best regards,

Peter

[Mennazz]

Are there any specific configurations for ADC and PWM for it to inject a fault in CMU0 and CMU3? 
knowing that I am setting:

• CMU_3_CSR to 0x1 
• CMU_3_HFREFR to 0x50 
• CMU_3_LFREFR to 0x30 
• CMU_0_CSR to 0x800301 
• CMU0_HFREFR to 0xa0 
• CMU_0_LFREFR to 0x60 

[petervlna]

Hello,

It is hard to comment from such little information.

the ISR bit is set by HW on following event. So I guess your SW doesn't no meet it.

Best regards,

Peter