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TMS320F28027: Question about PWM interrupt and IQmath

Part Number: TMS320F28027

Dear team:

Background: PWM2 cycle: 50us, IQmath: Only simple multiplication and addition are performed. IQmath had been confirmed to work normally.

1, When PWM2 is enabled: enablePWMCLKCounting(), The customer found that the serial port printing(printf) speed would be very slow, and it could only print one character per second, and the execution of the IQ program is also slow at this time. However, the content output from the serial port is correct.

2, If the enablePWMCLKCounting() function is masked, the speed of serial port printing(printf) and IQ calculation is normal.

May I ask what could be the problem?

Best regards,

Green