Code:
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#include <pic.h>
#ifndef _XTAL_FREQ
#define _XTAL_FREQ 4000000
#endif
__CONFIG(UNPROTECT & BORDIS & MCLRDIS & PWRTEN & WDTDIS & INTIO);
__IDLOC(0100);
#define VDD 5000
void ioport_adc() {
GPIO0 = 0; //output value
TRIS0 = 0; //output pin
ANS0 = 0; //digital pin
TRIS1 = 1; //input pin
ANS1 = 1; //analog input pin
ADON = 1; //ADコンバータを電源オンする
ADFM = 1; //AD変換結果データは右詰めるにする
ADCS0 = 1; //AD 変更クロックをFosc/8にする
ADCS1 = 0;
ADCS2 = 0;
CHS0 = 1; // AN1ピンの電圧をAD交換する
CHS1 = 0;
_delay(1000);
ADIF = 0; //割り込みフラグ。ピットを０にする
ADIE = 1; // PIE1レジスタに関連する割り込みを使
PEIE = 1;
GIE = 0; //we don't want interrupt
}
unsigned short adc_read () {
GODONE = 1;
_delay(1000);
while (GODONE);
return (ADRESH*256 + ADRESL); //return 8 MSB of the result
}
void putch(unsigned char tx_byte) {
unsigned char i;
GPIO0 =0;
_delay(1000);
for(i=0; i<8; i++) {
_delay(200);
GPIO0 = (tx_byte&0x01);
tx_byte>>=1;
tx_byte |= 0x80;
}
}
void adc_control () {
unsigned short volts;
ADIE = 1;
PEIE = 1;
while (1) {
ioport_adc();
_delay(200);
_delay(200);
_delay(200);
volts = (long)adc_read()*(VDD/255);
putch(volts);
}
}
void main(void) {
OSCCAL = _READ_OSCCAL_DATA();
ioport_adc();
while (1){
adc_control();
}
}