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How to used hardware interrupt for AD sample?

Denzel yulin
Prodigy 20 points
Other Parts Discussed in Thread: CC2541

I want to use CC2541 control a dust sensor, the sensor has an input pulse drive signal like this:

 

 

The drive signal with a high level about 0.32ms, how can I generate it in the OSAL?

The analog output from dust sensor is valid after rising edge of drive signal about 0.28ms,like picture below:(Iled is drive signal, output pulse is analog output signal)

 

 

How can I use AD to match this sampling timing?

  • 0
    TI__Expert 6995 points

    Hi Denzel, 

    For the pulse-driven waveform, I would use the PWM output of one of the Timer1/3/4. Use the prescaler to get the long period. 

    For the sampling, I would set up an interrupt on the rising edge of the drive signal. The OSAL timer resolution is 1 ms, so I would not use that to set up the ADC read task. I would rather set up Timer 1 CH0 to start the conversion after the desired amount of time after the interrupt. Please see the description in ADCCON1.STSEL register in the user guide. 

    Peder