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TMS320F28035: Illegal ISR

Part Number: TMS320F28035

Hi 

When I use below macro, my code entry ILLEGAL_ISR. 

Where is the problem?

(DELAY_US(10))

// DO NOT MODIFY THIS LINE.
#define DELAY_US(A) DSP28x_usDelay(((((long double) A * 1000.0L) / (long double)CPU_RATE) - 9.0L) / 5.0L)