之前我的程序能够读取AD值,但是会跳动,而且初始的电压不是0V,现在我程序修改以后,它是稳定了,读不了AD了是怎么回事?只能读到0.01V?
- #include "reg52.h"
- #include "intrins.h"
- typedef unsigned char uchar;
- typedef unsigned int uint;
- #define _Nop() _nop_()
- /*------------------------以下为LCD1602显示模块定义-----------------------*/
- unsigned char data_char_table[]= {"0123456789ABCDEF"}; //LCD数据
- unsigned char Lcd_Dis1_table[] = {"Position:No. "}; //第一行显示框架
- unsigned char pos_char_table[] = {" D "}; // 显示位置
- unsigned char Lcd_Dis2_table[] = {"Voltage : V"}; //第二行显示框架
- unsigned char num_char_table[] = {" 9A.CD V"}; // 显示位置
- sbit lcd_rs_port = P2^4; //定义LCD控制端口,根据硬件调整
- sbit lcd_rw_port = P2^3;
- sbit lcd_en_port = P2^2;
- #define lcd_data_port P0
- void lcd_delay(uchar ms); //LCD1602 延时
- void lcd_busy_wait(); //LCD1602 忙等待
- void lcd_command_write(uint command); //LCD1602 命令字写入
- void lcd_system_reset(); //LCD1602 初始化
- void lcd_char_write(uint x_pos,y_pos,lcd_dat); //LCD1602 字符写入
- void lcd_bad_check(); //LCD1602 坏点检查
- void Num_to_Disp(uchar i, uint Num); //显示数据处理
- void LcdDisp(uchar j, uint num); //液晶显示函数
- /*------------------------以下为ADC相应寄存器初始化及端口定义-------------*/
- /***** 定义与ADC相关的特殊功能寄存器 *****/
- sfr ADC_CONTR = 0xBC; //ADC控制寄存器
- sfr ADC_RES = 0xBD; //ADC hight 8-bit result register
- sfr ADC_RESL = 0xBE; //ADC low 2-bit result register
- sfr P1ASF = 0x9D; //P1口功能控制寄存器P1ASF
- sfr P1M0 = 0x92; //I/O模式寄存器
- sfr P1M1 = 0x91; //I/O模式寄存器
- /************定义相应操作位***************/
- #define ADC_POWER 0x80 //ADC电源控制位,0:关闭,1:打开
- #define ADC_FLAG 0x10 //ADC结束标志位
- #define ADC_START 0x08 //ADC启动控制位
- #define ADC_SPEEDLL 0x00 //540 clocks___________选择转换速度
- /*------------------------以下为相关函数声明------------------------------*/
- void InitADC(); //ADC初始化
- uint GetADCResult(uchar ch);
- void Delay(uint n); //延时程序
- void delay_1ms(uchar x);
- /*-------------------------------- ADC 取值 ------------------------------*/
- uint GetADCResult(uchar channel)
- {
- ADC_CONTR=0x88|channel; //开启AD转换1000 1000 即POWER SPEED1 SPEED0 ADC_FLAG ADC_START CHS2 CHS1 CHS0
- _nop_(); _nop_(); _nop_(); _nop_();//要经过4个CPU时钟的延时,其值才能够保证被设置进ADC_CONTR 寄存器
- // ADC_RES=0xdf;
- // ADC_RESL=0xef;
- while(!(ADC_CONTR&0x10)); //等待转换完成
- ADC_CONTR&=0xe7; //关闭AD转换,ADC_FLAG位由软件清0
- return(ADC_RES*4+ADC_RESL); //返回AD转换完成的10位数据(16进制)
- }
- /*---------------------------- 初始化ADC特殊功能寄存器 -------------------*/
- void InitADC( )
- {
-
- P1ASF = P1 | 0x3f; //Set P1.0 - P1.5 as analog input port
- ADC_RES = 0; //Clear previous result
- ADC_RESL = 0;
- ADC_CONTR = ADC_POWER | ADC_SPEEDLL ;
- Delay(20); //ADC power-on delay and Start A/D conversion
- }
- /*---------------------------- LCD1602相应函数 ---------------------------*/
- ///////////////以下为LCD显示数据处理/////////////////
- void Num_to_Disp(uchar i, uint Num)
- {
- float NUM;
- int xx, yy, zz;
- NUM =(Num * 5/ 1024.0); //计算公式:10-bit A/D Conversion Result = 1024 x (Vin / Vcc)
- xx = (int)NUM;
- yy = (int)((NUM - (float)(xx)) * 10);
- zz = (int)((NUM - (float)(xx)) * 100)%10;
- num_char_table[9] = data_char_table[xx / 10]; //电压值十位
- num_char_table[10]= data_char_table[xx % 10]; //电压值个位
- num_char_table[12]= data_char_table[yy]; //电压值小数点后一位
- num_char_table[13]= data_char_table[zz]; //电压值小数点后两位?
- pos_char_table[13]= data_char_table[i]; //当前ADC接口
- }
- //////////////////以下为LCD显示////////////////////
- void LcdDisp(uchar j, uint num)
- {
- uint i=0;
- for (i=0;i<16;i++)
- {
- lcd_char_write(i,0,Lcd_Dis1_table[i]);
- lcd_char_write(i,1,Lcd_Dis2_table[i]); //显示框架
- }
- Num_to_Disp(j, num);
- lcd_char_write(13,0,pos_char_table[13]);
- for(i = 9; i < 14; i++)
- {
- lcd_char_write(i,1,num_char_table[i]); //显示电压
- }
- delay_1ms(100);
- }
- //////////////以下是LCD1602驱动程序////////////////
- void lcd_delay(uchar ms) /*LCD1602 延时*/
- {
- uchar j;
- while(ms--){
- for(j=0;j<250;j++)
- {;}
- }
- }
- void lcd_busy_wait() /*LCD1602 忙等待*/
- {
- lcd_rs_port = 0;
- lcd_rw_port = 1;
- lcd_en_port = 1;
- lcd_data_port = 0xff;
- while (lcd_data_port&0x80);
- lcd_en_port = 0;
- }
- void lcd_command_write(uint command) /*LCD1602 命令字写入*/
- {
- lcd_busy_wait();
- lcd_rs_port = 0;
- lcd_rw_port = 0;
- lcd_en_port = 0;
- lcd_data_port = command;
- lcd_en_port = 1;
- lcd_en_port = 0;
- }
- void lcd_system_reset() /*LCD1602 初始化*/
- {
- lcd_delay(20);
- lcd_command_write(0x38);
- lcd_delay(100);
- lcd_command_write(0x38);
- lcd_delay(50);
- lcd_command_write(0x38);
- lcd_delay(10);
- lcd_command_write(0x08);
- lcd_command_write(0x01);
- lcd_command_write(0x06);
- lcd_command_write(0x0c);
- }
- void lcd_char_write(uint x_pos,y_pos,lcd_dat) /*LCD1602 字符写入*/
- {
- x_pos &= 0x0f; /* X位置范围 0~15 */
- y_pos &= 0x01; /* Y位置范围 0~ 1 */
- if(y_pos==1) x_pos += 0x40;
- x_pos += 0x80;
- lcd_command_write(x_pos);
- lcd_busy_wait();
- lcd_rs_port = 1;
- lcd_rw_port = 0;
- lcd_en_port = 0;
- lcd_data_port = lcd_dat;
- lcd_en_port = 1;
- lcd_en_port = 0;
- }
- void lcd_bad_check() /*LCD1602 坏点检查*/
- {
- char i,j;
- for(i=0;i<2;i++){
- for(j=0;j<16;j++) {
- lcd_char_write(j,i,0xff);
- }
- }
- lcd_delay(200);
- lcd_delay(200);
- lcd_delay(200);
- lcd_delay(100);
- lcd_delay(200);
- lcd_command_write(0x01); /* clear lcd disp */
- }
- //////////////////以上是LCD1602驱动程序////////////////
- /*----------------------------- 延时程序 ---------------------------*/
- void Delay(uint n)
- {
- uint x;
- while (n--)
- {
- x = 500;
- while (x--);
- }
- }
- /*1MS为单位的延时程序*/
- void delay_1ms(uchar x)
- {
- uchar j;
- while(x--)
- {
- for(j=0;j<125;j++)
- {;}
- }
- }
- /*****************************************************************
- 函数: averageValueVolgate()
- 用途: 求多次采集电压平均值
- 传入参数:chan是端口号
- 返回值:Val_Av是多次采样的电压值平均值
- ******************************************************************/
- float averageValueVolgate(uchar chan)
- {
- float voltageValue=0;
- uchar num;
- for(num=100;num>0;num--)
- {
- voltageValue+=GetADCResult(chan);
- }
- voltageValue/=100.0;
- voltageValue=voltageValue*5.0/1024;
- return (voltageValue);
- }
- /*-------------------------------- 主函数 --------------------------------*/
- void main()
- {
- uchar i;
- lcd_system_reset(); //LCD1602 初始化
- lcd_bad_check(); //LCD1602 坏点检查
- InitADC(); //初始化ADC特殊功能寄存器
- // P1M1 = 0xFF; //P1.0/P1.5高阻 0011 1111
- // P1M0 = 0x00; //P1.0/P1.5高阻 0000 0000
- while (1)
- {
- i = 0;
- LcdDisp(i,averageValueVolgate(0)); //液晶1602显示第3通道电压值
- Delay(1000);
- }
- }
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