MEGA16 MCU_AD conversion program-EEWORLD

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AD conversion, the programmed registers are:

ADMUX: Multiplexer selection register. Reference voltage, alignment, analog channel and gain selection bits

ADCSR (A): enable, interrupt flag, interrupt enable, prescaler value, etc.

ADCL, ADCH: data register

SFI0R: Special Function Register

///////////////////////////////////////////////////// /////////////////////////////////////////////////////

#ifndef __AD_H__

#define __AD_H__

#include

#define uchar unsigned char

#define uint unsigned int

extern uint mega16_ad(void);

#endif

///////////////////////////////////////////////////// /////////////////////////////////////////////////////

#include "ad.h"

uint mega16_ad(void)

{

uint addata;

DDRA&=~BIT(PA0);

PORTA&=~BIT(PA0);

ADMUX=0x00;

ADCSR=0X80;

ADCSR|=BIT(ADSC);

while(!(ADCSR&(BIT(ADIF))));//That is: while(!(ADCSR&0x10));

addata=ADCL;

addata=addata+ADCH*256;

return addata;

}

///////////////////////////////////////////////////// ///////////////////////////////////////////////////// /////

#include "ad.h"

#include "smg.h"

void main(void)

{

DDRA&=~BIT(PA0); //Select analog channel 0

PORTA&=~BIT(PA0);

SystemInit();

while(1)

{

Show(mega16_ad()/1000,0);

Show(mega16_ad()%1000/100,1);

Show(mega16_ad()%100/10,2);

Show(mega16_ad()%100%10,3);

}

///////////////////////////////////////////////////// ///////////////////////////////////////////////////// ////

/*MCU:ATMEGA16

Crystal frequency: 8MHZ

Function: Digital tube dynamic scanning program

#ifndef __SMG_H__

#define __SMG_H__

#include

#define uchar unsigned char

#define uint unsigned int

extern const table[];

//**********1ms benchmark delay program***********************************

void DelayMs(unsigned int ms);

void SystemInit(void);

void Show(unsigned char ddata,unsigned char num);

#endif

///////////////////////////////////////////////////// ///////////////////////////////////////////////////// ///

/*MCU:ATMEGA16

Crystal frequency: 8MHZ

Function: Digital tube dynamic scanning program

#include "smg.h"

#pragma data:code //Common anode digital tube code table

const table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,

0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xb6};

//**********1ms benchmark delay program***********************************

void DelayMs(unsigned int ms)

{

unsigned int j;

while(--ms)

{

for(j=1141;j>0;--j);//1141

}

void SystemInit(void)

{

DDRA |= (1<<2)|(1<<3)|(1<<4)|(1<<6);

DDRB |= 0xFF;

PORTA |= (1<<2)|(1<<6);

PORTB = 0xFF;

PORTA &= (~(1<<2))&(~(1<<6));

}

void Show(unsigned char ddata,unsigned char num)

{

PORTA |= (1<<3);

PORTB = table[ddata];

PORTA &= ~(1<<3);

PORTB = 0x00;

PORTA |= (1<<4);

PORTB = (1<

PORTA &= ~(1<<4);

DelayMs(2);

}

Keywords：MEGA16 Reference address：MEGA16 MCU_AD conversion program

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