蓝桥杯电子类单片机组模块——ADC

在蓝桥杯电子类单片机组历年的省赛以及国赛中，ADC模块常常被考察到。而组委会为减轻考生负担，提前给出了关于ADC模块的代码，剩下的便需要我们自己去编写（以第十届为例）。

现在，我们来介绍以下ADC模块剩余代码的编写以及模块的运用方法。

1、补全模块C文件

#include "reg52.h"
#include "intrins.h"

#define DELAY_TIME 5

#define SlaveAddrW 0xA0
#define SlaveAddrR 0xA1


sbit SDA = P2^1;  
sbit SCL = P2^0;  

void IIC_Delay(unsigned char i)
{
    do{_nop_();}
    while(i--);        
}

void IIC_Start(void)
{
    SDA = 1;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 0;
    IIC_Delay(DELAY_TIME);
    SCL = 0;	
}


void IIC_Stop(void)
{
    SDA = 0;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}


void IIC_SendAck(bit ackbit)
{
    SCL = 0;
    SDA = ackbit;  					// 0£ºÓ¦´ð£¬1£º·ÇÓ¦´ð
    IIC_Delay(DELAY_TIME);
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SCL = 0; 
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}


bit IIC_WaitAck(void)
{
    bit ackbit;
	
    SCL  = 1;
    IIC_Delay(DELAY_TIME);
    ackbit = SDA;
    SCL = 0;
    IIC_Delay(DELAY_TIME);
    return ackbit;
}


void IIC_SendByte(unsigned char byt)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        SCL  = 0;
        IIC_Delay(DELAY_TIME);
        if(byt & 0x80) SDA  = 1;
        else SDA  = 0;
        IIC_Delay(DELAY_TIME);
        SCL = 1;
        byt <<= 1;
        IIC_Delay(DELAY_TIME);
    }
    SCL  = 0;  
}


unsigned char IIC_RecByte(void)
{
    unsigned char i, da;
    for(i=0; i<8; i++)
    {   
    	SCL = 1;
	IIC_Delay(DELAY_TIME);
	da <<= 1;
	if(SDA) da |= 1;
	SCL = 0;
	IIC_Delay(DELAY_TIME);
    }
    return da;    
}

//************************下面的代码需要自己写***********************//
void write_adc(unsigned char add)
{
		EA=0;
		IIC_Start();
		IIC_SendByte(0x90);
		IIC_WaitAck();
		IIC_SendByte(add);
		IIC_WaitAck();
		IIC_Stop();
		EA=1;

}

unsigned char read_adc(unsigned char add)
{
		unsigned char temp;
		EA=0;
		IIC_Start();
		IIC_SendByte(0X90);
		IIC_WaitAck();
		IIC_SendByte(add);
		IIC_WaitAck();
	
		IIC_Start();
		IIC_SendByte(0X91);
		IIC_WaitAck();
		temp=IIC_RecByte();
		IIC_WaitAck();
		IIC_Stop();
		EA=1;
		return temp;

}
//************************上面的代码需要自己写***********************//

2、补全模块H文件

#ifndef _IIC_H
#define _IIC_H

void IIC_Start(void); 
void IIC_Stop(void);  
bit IIC_WaitAck(void);  
void IIC_SendAck(bit ackbit); 
void IIC_SendByte(unsigned char byt); 
unsigned char IIC_RecByte(void); 
void IIC_SendByte(unsigned char byt);
unsigned char IIC_RecByte(void);
//************************下面的代码需要自己写***********************//
void write_adc(unsigned char add);
unsigned char read_adc(unsigned char add);
//************************上面的代码需要自己写***********************//
#endif

3、在主函数中运用ADC模块

#include "STC15F2K60S2.H"
#include "iic.h"
#define u8 unsigned char 

u8 code t_display[]={                       //????
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black  -     H    J    K    L    N    o   P    U     t    G    Q    r   M    y
    0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
    0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

u8 code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};      //??

void Timer0Init(void)		//[email protected]
{
	AUXR |= 0x80;		//?????1T??
	TMOD &= 0xF0;		//???????
	TL0 = 0xCD;		//??????
	TH0 = 0xD4;		//??????
	TF0 = 0;		//??TF0??
	TR0 = 1;		//???0????
	ET0 = 1;
	EA  = 1;
}

u8 adc_val;
u8 adc_display[8];
void main()
{

		P0=~0x00;P2=0X80;P2=0X00;
		P2=0XA0;P0=0X00;P2=0X00;
		Timer0Init();
	
		while(1)
		{

			adc_val=read_adc(0x03);
			adc_display[0]=t_display[adc_val/100];
			adc_display[1]=t_display[adc_val/10%10];
			adc_display[2]=t_display[adc_val%10];
			
		}
}

void Timer0()	interrupt 1//[email protected]
{
		static int smg_count=0,i=0;
		smg_count++;
		
		
		if(smg_count==2)
		{
			smg_count=0;
			P2=0XC0;P0=0;P2=0;
			P2=0XE0;P0=~adc_display[i];P2=0;
			P2=0XC0;P0=T_COM[i];P2=0;
			i++; 
			if(i==8){i=0;}


		}


}

4、另外，在运用ADC模块的时候还涉及到了数码管模块。大家可以参照下面的blog链接：https://blog.csdn.net/qq_44629819/article/details/104490649

祝大家在蓝桥杯比赛中获得优异的成绩！
——南昌大学 电子183刘昊