F28M35H52C: could we run main isr and cup timer1(or other INT) isr several times in parallel？

user6034716

Part Number: F28M35H52C
Other Parts Discussed in Thread: ADS7253

Hi,

Now we run a main isr which takes about 90us while the period is 100us, so only 10us is left. We want to use cup timer1 ISR to send SPI to ADS7253 9 times(which needs 2us for one time,totally need 18us ) to get the ADC data in parallel with above main isr. Obviously, the conflict is the 18us > 10us. And we also wonder how the run the cup timer1 ISR 9 times in average time in the main ISR.

Could you give some help to solve this two questions?

Peter

over 5 years ago

0 user6034716 over 5 years ago

Intellectual 600 points

The main ISR is rtos(cup timer2) INT.

0 Veena Kamath over 5 years ago in reply to user6034716

TI__Mastermind 32375 points

Hi,

Have you tried to optimize the ISRs? If you are using C, you can try enabling the compiler optimization to save come ISR cycles.

Are you sending the ADC converted data via SPI? In that case, use can include teh PSI routines in the ADC ISR itself. It would save some cycles spend due to CPU Timers's ISR latency

Regards.

Veena

0 user6034716 over 5 years ago in reply to Veena Kamath

Intellectual 600 points

Veena，

Thanks for your answer. We will try your suggestion.

Peter

C2000™︎ microcontrollers

C2000 microcontrollers forum

F28M35H52C: could we run main isr and cup timer1(or other INT) isr several times in parallel？