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Edge detector in PIC using CCS

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boncker

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Hello guys,

I need to detect an external edge transition input in the PIC 16F877A in the port C4.
Is there any command that detects edge transition in CCS compiler?

Thanks!!!
 

Hello!

You can detect edge transition only if the signal arrive to pin with external interrupt or interrupt on change pin (portB). In this case you can use interrupt function.
If signal comes to pin C4 you can use only pooling.
For reading a input pin you should use if(input(PIN_C4)).......

Cristi
 

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    boncker

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I don't know how the ports are called in CCS, but something like this should work.
Code: 
while(RC4);
This waits until the pin becomes low, so a falling edge. Use "!RC4" for the other direction.
 

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    boncker

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while(input(PIN_C4)); is waiting for a falling edge and
while(!input(PIN_C4)); is waiting for a raising edge
 

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    boncker

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