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/***************************************************************/
/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC12C5Axx Series MCU A/D Conversion Demo -------------------*/
/* If you want to use the program or the program referenced in the */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"
#define FOSC 11059200L
#define BAUD 9600
typedef unsigned char BYTE;
typedef unsigned int WORD;
/*Declare SFR associated with the ADC */
sfr ADC_CONTR = 0xBC; //ADC control register
sfr ADC_RES = 0xBD; //ADC hight 8-bit result register
sfr ADC_LOW2 = 0xBE; //ADC low 2-bit result register
sfr P1ASF = 0x9D; //P1 secondary function control register
/*Define ADC operation const for ADC_CONTR*/
#define ADC_POWER 0x80 //ADC power control bit
#define ADC_FLAG 0x10 //ADC complete flag
#define ADC_START 0x08 //ADC start control bit
#define ADC_SPEEDLL 0x00 //420 clocks
#define ADC_SPEEDL 0x20 //280 clocks
#define ADC_SPEEDH 0x40 //140 clocks
#define ADC_SPEEDHH 0x60 //70 clocks
void InitUart();
void SendData(BYTE dat);
void Delay(WORD n);
void InitADC();
BYTE ch = 0; //ADC channel NO.
void main()
{
InitUart(); //Init UART, use to show ADC result
InitADC(); //Init ADC sfr
IE = 0xa0; //Enable ADC interrupt and Open master interrupt switch
//Start A/D conversion
while (1);
}
/*----------------------------
ADC interrupt service routine
----------------------------*/
void adc_isr() interrupt 5
{
ADC_CONTR &= !ADC_FLAG; //Clear ADC interrupt flag
SendData(ch); //Show Channel NO.
SendData(ADC_RES); //Get ADC high 8-bit result and Send to UART
//if you want show 10-bit result, uncomment next line
// SendData(ADC_LOW2); //Show ADC low 2-bit result
if (++ch > 7) ch = 0; //switch to next channel
ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ch;
}
/*----------------------------
Initial ADC sfr
----------------------------*/
void InitADC()
{
P1ASF = 0xff; //Set all P1 as analog input port
ADC_RES = 0; //Clear previous result
ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ch;
Delay(2); //ADC power-on delay and Start A/D conversion
}
/*----------------------------
Initial UART
----------------------------*/
void InitUart()
{
SCON = 0x5a; //8 bit data ,no parity bit
TMOD = 0x20; //T1 as 8-bit auto reload
TH1 = TL1 = -(FOSC/12/32/BAUD); //Set Uart baudrate
TR1 = 1; //T1 start running
}
/*----------------------------
Send one byte data to PC
Input: dat (UART data)
Output:-
----------------------------*/
void SendData(BYTE dat)
{
while (!TI); //Wait for the previous data is sent
TI = 0; //Clear TI flag
SBUF = dat; //Send current data
}
/*----------------------------
Software delay function
----------------------------*/
void Delay(WORD n)
{
WORD x;
while (n--)
{
x = 5000;
while (x--);
}
}

復制代碼

#include <STC12C5A60S2.H>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
/***宏定義ADC的操作命令***/
#define ADC_POWER 0x80 //ADC power control bit
#define ADC_FLAG 0x10 //ADC complete flag
#define ADC_START 0x08 //ADC start control bit
#define ADC_SPEEDLL 0x00 //420 clocks
/***LCD端口定義***/
//#define DataPort P2 //連接1602數據口 P2
sbit LCD_RS=P0^7; //液晶屏RS口寫指令低，寫數據高
sbit LCD_RW=P0^6; //液晶屏RW口寫數據低，讀數據高如果不查忙RW可以直接接地，去掉LCD_RW=0;
sbit LCD_EN=P0^5; //液晶屏EN口高電平使能，低跳變執行
/********本地全局變量聲明**************/
uchar table1[]="Voltmeter No.1"; //LCD第一行字符
uchar table2[]="CH0: 0.000 V"; //LCD第二行字符
uint dis_buf[8]; //ADC轉換數據緩存
uint Cnt2ms; //計時變量
uchar Channel; //通道變量
uchar num=0; //輪流顯示變量
uint ADC_V; //ADC電壓值變量
/********本地函數聲明**************/
void Timer0Init(); //定時器初始化函數
void InitADC(); //ADC初始化函數
uint GetADCResult(uchar ch); //ADC轉換函數
void delay(uint x); //延時函數
void write_com(uchar com); //LCD寫命令函數
void write_date(uchar date); //LCD寫數據函數
void LCD_init(); //初始化LCD函數
void Filter(); //采樣濾波函數
void main()
{
uchar a;
P1M0=0x00; //P1口全部為高阻輸入
P1M1=0xff; //P1口全部為高阻輸入
Timer0Init(); //初始化定時器
InitADC(); //初始化ADC
LCD_init(); //初始化LCD
write_com(0x80+1);//初始化LCD第一行字符
for(a=0;a<14;a++)
write_date(table1[a]);
write_com(0xc0+2);//初始化LCD第二行字符
for(a=0;a<12;a++)
write_date(table2[a]);
while(1)
{
if(TF0) //查詢2msT0中斷請求標志
{
TF0=0; //清除T0中斷請求標志
Filter(); //讀取ADC轉換數據
Cnt2ms++;
if(Cnt2ms>=500)//1秒刷新LCD顯示數據
{
Cnt2ms=0;
//輪流取緩存中數據強制轉換數據類型(32位)運算，得到(4舍5入)mV，顯示在LCD
ADC_V=(5*(long)dis_buf[num]*10000/1024+5)/10;//
table2[5]=ADC_V/1000%10+'0';
table2[7]=ADC_V/100%10+'0';
table2[8]=ADC_V/10%10+'0';
table2[9]=ADC_V%10+'0';
write_com(0xc0+4); //顯示通道數
write_date(num+1+'0');
write_com(0xc0+7); //顯示電壓值
for(a=0;a<5;a++)
write_date(table2[a+5]);
num++;
if(num>=8)
num=0;
}
}
}
}
/*******1ms延時程序********/
void delay(uint x)//1T/11.0592MHz
{
uint a,b;
for(a=x;a>0;a--)
for(b=829;b>0;b--);
}
/*******1602液晶屏寫指令程序********/
void write_com(uchar com)
{
LCD_RS=0; //允許寫指令
P2=com; //傳遞指令
delay(1); //延時1ms
LCD_EN=1; //使能寫入
delay(1); //延時1ms
LCD_EN=0; //低跳變執行
}
/*******1602液晶屏寫數據程序********/
void write_date(uchar date)
{
LCD_RS=1; //允許寫數據
P2 =date; //傳遞數據
delay(1); //延時1ms
LCD_EN=1; //使能寫入
delay(1); //延時1ms
LCD_EN=0; //低跳變執行
}
/*******1602液晶屏初始化程序********/
void LCD_init() //設置顯示模式、
{
LCD_RW=0;
LCD_EN=0; //初始設置LCD_EN低電平
write_com(0x38);//設置16*2顯示，5*7點陣，8位數據接口
write_com(0x01);//顯示清零，數據指針清零
write_com(0x0c);//設置開顯示，不顯光標
write_com(0x06);//設置寫一個字符后地址指針加1
}
/*----------------------------
Init Timer0
----------------------------*/
void Timer0Init() //2毫秒@11.0592MHz
{
AUXR |= 0x80; //定時器時鐘1T模式
TMOD &= 0xF0; //設置定時器模式
TL0 = 0x9A; //設置定時初值
TH0 = 0xA9; //設置定時初值
TF0 = 0; //清除TF0標志
TR0 = 1; //定時器0開始計時
}
/*----------------------------
Get ADC result
----------------------------*/
uint GetADCResult(uchar ch)
{
ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ch | ADC_START;
_nop_(); //Must wait before inquiry
_nop_();
_nop_();
_nop_();
while (!(ADC_CONTR & ADC_FLAG));//Wait complete flag
ADC_CONTR &= ~ADC_FLAG; //Close ADC
return (ADC_RES<<2|ADC_RESL); //返回10位ADC
}
/*----------------------------
Initial ADC sfr
----------------------------*/
void InitADC()
{
P1ASF = 0xff; //Open 8 channels ADC function
ADC_RES = 0; //Clear previous result
ADC_RESL= 0;
ADC_CONTR = ADC_POWER | ADC_SPEEDLL;
delay(2); //延時2ms //ADC power-on and delay
}
//采樣濾波
void Filter()
{
static uchar count=0;
static uint V_ADC;
V_ADC+=GetADCResult(Channel);
count++;
if(count>=10) //如果計數十次采樣
{
count=0; //計數器清0
dis_buf[Channel]=(V_ADC+5)/10;//四舍五入獲取平均值保存在緩存中
V_ADC=0; //采樣變量清0
Channel++;
if(Channel==8)
Channel=0;
}
}

復制代碼

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