简易可编程恒流源 - 图文 

6.2程序代码

#include #include #include

#define uchar unsigned char #define uint unsigned int

uchar code zifux[]=%uchar code zifu0[]=\ Constant %uchar code zifu1[]=\ \//按键

sbit key1=P3^0; sbit key2=P3^1;

unsigned long da1=100;// unsigned long dax1=200;// voidxianshi() { //out

lcd1602_adr(0x45);

lcd1602_writenumber(0x30+dax1000/1000); lcd1602_writenumber(0x30+dax100/100); lcd1602_writenumber(0x30+dax10/10); lcd1602_writenumber(0x30+dax1); da1=dax1*975/2000; DAconver1(da1); //调节 void main() {

_delay_ms(1);

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//初始化 lcd1602_init();

LCD1602_string(1,1,zifu0); LCD1602_string(1,1,zifu0); LCD1602_string(2,1,zifu1); //初始化 while(1) {

//显示函数 xianshi(); }

}

sbit clk1=P2^0; sbit cs1=P2^1; sbit din1=P2^2; sbit dout1=P2^3; //延时函数ms void _delay_ms(uint t) { uinti,j; for(i=0;i

//延时函数us

void _delay_us(uchar t) {

while(t>0)t--; }

//12个时钟驱动，十位数据在12位的前

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//16位数据DAValue先左移6位，剩下的十位是有效数据 void DAconver1(uintDAValue) { uchari; DAValue<<= 6;

cs1 = 0;

clk1 = 0; for(i = 0; i< 12; i++) // { din1 = (bit)(DAValue& 0x8000); clk1 = 1; DAValue<<= 1; clk1 = 0; }

cs1 = 1; clk1 = 0; }

sbit RS=P3^2;

//写信号

sbit RWW=P3^3; //读信号 sbit E=P3^4; //使能信号 #define e1 E=1 #define rd1 RWW=1 #define rs1 RS=1 #define e0 E=0 #define rd0 RWW=0 #define rs0 RS=0 #define PP P1 //写1602控制字

void lcd1602_writecrtl(uchardat)

内输入的是10位DA数据，后两个时钟周期 // 为填充字节。 // CS的上升沿和下降沿只有在clk为低的时候 // 才有效 13

{

rd0;//读信号置0 rs0;//写信号置0 _delay_us(5); PP=dat;

e1;//使能信号置1 _delay_us(5); e0;//使能信号置0 }

//写1602数据

void lcd1602_writenumber(uchardat) {

rd0;//读信号置0 rs1;//写信号置1 _delay_us(5); PP=dat;

e1;//使能信号置1 _delay_us(5); e0;//使能信号置0 }

//1602初始化 void lcd1602_init() {

lcd1602_writecrtl(0x38); //显示模式

lcd1602_writecrtl(0x06); //显示光标移动位置 lcd1602_writecrtl(0x0c); //显示开及光标设置 lcd1602_writecrtl(0x01); //显示清屏 }

//显示地址

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void lcd1602_adr(uchardat) {

lcd1602_writecrtl(0x80 | dat); } //行显示-

void LCD1602_string(ucharhang,ucharlie,ucharconst *p) { uchar a;

if(hang == 1) a = 0x00; if(hang == 2) a = 0x40; a = a + lie - 1; lcd1602_adr(a); while(1) { if(*p == '\\0') break; lcd1602_writenumber(*p); p++;

}

}

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