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What is the maximum number of interrupts that can be handled per second in a kinetis K61 (MK61FX512VMJ15) controller

Question asked by sumit nandi on Nov 22, 2016
Latest reply on Nov 24, 2016 by xiangjun.rong

Hi Everyone

I want ADC (single conversion) samples every 72usec. In my project i already have 1ms timer interrupts and UART interrupts at every 5ms or so and few other interrupts as well. I am not using DMA. ADC is triggered through PDB.

 

SIM_SCGC3 |= (SIM_SCGC3_ADC1_MASK);

ADC1_CFG1 = ADC_CFG1_MODE(0x02) | ADC_CFG1_ADICLK(0x01);

ADC1_CFG2 = ADC_CFG2_ADHSC_MASK;

ADC1_SC2 = ADC_SC2_ADTRG_MASK ;

ADC1_SC3 = ADC_SC3_CALF_MASK;

 

My problem:  with ADC samples every 500usec and all other interrupts am getting expected behavior and halts at breakpoint in ADC interrupt routine. But when i change this period to less than 500 usec i.e 400usec or 300usec the observed behavior is unexpected; there are no halts in ADC interrupt routine.

 

I am suspecting that below 500usec period a large number of interrupts are being generated which is causing miss in servicing interrupts.

 

Would using DMA help me in capturing all the ADC samples?

 

Thanks

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