How can I cause interrupt from ADC compare?

melvinblades — Mon, 13 Jan 2014 06:01:17 GMT

I want to create an interrupt that occurs when an ADC channel input crosses a voltage threshold.

I'm using processor expert, on a K40 (but would be happy to have non-processor expert help!)

In processor expert, I have created an AnalogComp_LDD component

This component has

1 positive input : CMP0_IN4

I want the 2nd input to be from the internal DAC and be able to select the output of the DAC.

So within the AnalogComp_LDD component, I set the negative input to Dac6 output , sourced internally from component DA2

[I'm not sure why one is positive and one is negative. They are both positive voltages.]

Component DA2 is configured to to an initial value of 32 which should be 1/2 of the refrerence voltage since there is 6 bits of resolution and the full range is 0-64.

My "code" does get an initial interrupt on startup. But does not get another interrupt. regardless of the signal I put on the input.

Any suggesteions on what to try or alternate methods is appreciated.

Re: How can I cause interrupt from ADC compare?

melvinblades — Mon, 13 Jan 2014 19:03:33 GMT

I solved my own problem.

I wanted the 2nd input on the comparator to come internally from the DAC

I had set the reference voltage up to "internal" -- but what I I wanted

was the DAC output to be generated internally,

The reference voltage for the DAC is actually external (VDD)

Kinetis Microcontrollers中的主题 How can I cause interrupt from ADC compare?

How can I cause interrupt from ADC compare?

Re: How can I cause interrupt from ADC compare?