采集电路.png
- #include <reg52.h>
- #include<intrins.h>
- #include<math.h>
- #include <stdio.h>
- char data str[]=" ";
- /**********************************/
- /**********LCD1602接口程序**********/
- #define DD P2
- sbit Rs=P3^0;
- sbit Rw=P3^1;
- sbit E=P3^2;
- /********************************/
- void delay_1ms(unsigned char i) //最小延时1ms
- {
- unsigned char j;
- while(i--)
- for(j=0;j<125; j++);
- }
- void delay_10us(unsigned char i) //最小延时10us
- {
- unsigned char j;
- while(i--)
- for(j=0;j<10; j++);
- }
- void write_com(unsigned char com) //写指令
- {
- delay_10us(5);
- E=0;
- Rs=0;
- Rw=0;
- DD=com;
- delay_10us(50); //>40us
- E=1;
- delay_1ms(2); //>150us
- E=0;
- delay_10us(4); //>25+10us
- }
- void write_data(unsigned char DATA) //写数据
- {
- delay_10us(50);
- E=0;
- Rs=1;
- Rw=0;
- DD=DATA;
- delay_10us(50);
- E=1;
- delay_10us(50);
- E=0;
- delay_10us(4);
- }
- void addr_x_y(unsigned char x,bit y) //写坐标,定位置
- {
- unsigned char temp=0x80; //默认最高位:D7为1 即以0x80开始。
- if(y) //y :0为第一行 1为第二行
- {
- temp|=0x40;
- }
- temp|=x;
- write_com(temp);
- }
- void Show_Char(unsigned char x,bit y,unsigned char p)
- //在指定位置显示一个字符。
- {
- addr_x_y(x,y);
- write_data(p);
- }
- void Show_String(unsigned char x,bit y,char *ptr)
- {
- unsigned char i;
- for (i=0;i<16;i++)
- Show_Char(x++,y,*(ptr+i));//循环显示16个字符
- }
- void init(void) //1602初始化代码
- {
- delay_1ms(1500);
- write_com(0x38);
- delay_1ms(5);
- write_com(0x38);
- delay_1ms(5);
- write_com(0x38);
- delay_1ms(5);
- write_com(0x38);
- write_com(0x08);
- write_com(0x06);
- write_com(0x0c);
- write_com(0x01);
- }
- void xs_int(unsigned int shuju,bit t) //数据显示
- {
- unsigned char huancun[6]={0};
- unsigned char biaozhi=0,i;
- if (shuju < 10) biaozhi = 1;
- else if(shuju < 100) biaozhi = 2;
- else if(shuju < 1000) biaozhi = 3;
- else if(shuju < 10000) biaozhi = 4;
- else if(shuju < 65535) biaozhi = 5;
- switch(biaozhi) //这里没有break,因此从标识匹配的入口直接执行到最后,完成整数各位的提取到数组。
- {
- case 5:huancun[5] = shuju/10000;
- case 4:huancun[3] = shuju%10000/1000;
- case 3:huancun[2] = shuju%1000/100;
- case 2:huancun[1] = shuju%100/10;
- case 1:huancun[0] = shuju%10; break;
- default:break;
- }
- for(i=0;i<6;i++)
- {
- if(i==1)Show_Char(i,1,'.'); //加入小数点,缩小了10000倍,因此AD采样后的值需要乘上10000*5V/256=196(V)
- else Show_Char(i,t,0x30+huancun[6-i-1]);
- }
- Show_Char(6,t,'V');
- }
- /************************************************************/
- /**********ADC0832接口程序************************************/
- sbit ADC_CS =P3^4;
- sbit ADC_CLK=P3^5;
- sbit ADC_DO =P3^6;
- sbit ADC_DI =P3^7;
- /*******************************************************************/
- void Delay(unsigned char j)
- {
- unsigned char i;
- for(i=0;i<j;i++); //延时,脉冲一位持续的时间
- }
- unsigned char ADC0832(void) //把模拟电压值转换成8位二进制数并返回
- {
- unsigned char i,data_c;
- data_c=0;
- ADC_CS=0;
- ADC_CLK=1;
- ADC_DO=0;//片选,DO为高阻态
- //ADC_DI=0; //先拉低
-
- for(i=0;i<10;i++)
- {;}
-
- ADC_CLK=0;
- Delay(2);
- ADC_CLK=1;
- ADC_DI=1; //启始位
- Delay(2);
-
- ADC_CLK=0; //第一个脉冲下降沿,DI=1为起始位
- Delay(2);
- ADC_CLK=1;
- ADC_DI=1; //1
- Delay(2);
-
- ADC_CLK=0; //第二个脉冲下降沿,DI=1
- Delay(2);
- ADC_DI=1; //1 若为0则选择CH0
- ADC_CLK=1;
- Delay(2);
-
- ADC_CLK=0; //第三个脉冲下降沿,DI=1,选择 ADC0832 的CH1(1 1)
- Delay(2);
- ADC_DI=1; //已不关心
- ADC_DO=1; //高阻
- ADC_CLK=1;
- Delay(2);
-
- for (i=0; i<8; i++)
- {
- ADC_CLK=0; //第四个开始读数据
- Delay(2);
- data_c=(data_c<<1)|ADC_DO;//在每个脉冲的下降沿DO输出一位数据,最终ch为8位二进制数
- ADC_CLK=1;
- Delay(2);
- }
- ADC_CS=1;//取消片选,一个转换周期结束
- return(data_c);//把转换结果返回
- }
- void main(void)
- {
- unsigned int data_temp=0;
- while(1)
- {
- data_temp=ADC0832();
- sprintf(str,"The voltage is:"); //the first line
- init();
- Show_String(0,0,str);
- xs_int(196*data_temp,1); //10000*5V/256=196(V),把采样值放大10000倍后再处理,移动小数点4位。 4位有效数字,其实用不到,因为8位采样精度为:0.019V
- delay_1ms(1500);
- }
- }
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