PIC18F46K80T-I/SP 查看數據表（PDF） - Microchip Technology

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PIC18F46K80T-I/SP

28/40/44/64-Pin, Enhanced Flash Microcontrollers with ECAN™ and nanoWatt XLP Technology

Microchip Technology 

PIC18F66K80 FAMILY

EXAMPLE 18-4: ROUTINE FOR CAPACITIVE TOUCH SWITCH

#include "p18cxxx.h"

#define COUNT 500

#define DELAY for(i=0;i<COUNT;i++)

#define OPENSW 1000

#define TRIP 300

#define HYST 65

#define PRESSED 1

#define UNPRESSED 0

//@ 8MHz = 125uS.

//Un-pressed switch value

//Difference between pressed

//and un-pressed switch

//amount to change

//from pressed to un-pressed

int main(void)

{

unsigned int Vread;

unsigned int switchState;

int i;

//storage for reading

//assume CTMU and A/D have been setup correctly

//see Example 25-1 for CTMU & A/D setup

setup();

CTMUCONHbits.CTMUEN = 1;

//Enable the CTMU

CTMUCONHbits.IDISSEN = 1;

DELAY;

CTMUCONHbits.IDISSEN = 0;

//drain charge on the circuit

//wait 125us

//end drain of circuit

CTMUCONLbits.EDG1STAT = 1;

DELAY;

CTMUCONLbits.EDG1STAT = 0;

//Begin charging the circuit

//using CTMU current source

//wait for 125us

//Stop charging circuit

PIR1bits.ADIF = 0;

ADCON0bits.GO=1;

while(!PIR1bits.ADIF);

//make sure A/D Int not set

//and begin A/D conv.

//Wait for A/D convert complete

Vread = ADRES;

//Get the value from the A/D

if(Vread < OPENSW - TRIP)

{

switchState = PRESSED;

}

else if(Vread > OPENSW - TRIP + HYST)

{

switchState = UNPRESSED;

}

}

 2010-2012 Microchip Technology Inc.

DS39977F-page 247

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