Pcf8591-AD转换C程序.doc

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1、Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-datePcf8591-AD转换C程序Pcf8591 AD转换C程序 Pcf8591 AD转换C程序#include #include #define uchar unsigned charunsigned char code table = 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x

2、5e,0x79,0x71;sbit SCL = P21;sbit SDA = P20;void delay()_nop_(); _nop_(); _nop_(); _nop_();void init() SDA = 1; SCL = 1;void start()SDA = 1; SCL = 1;delay();SDA = 0;delay();SCL = 0;void stop()SDA = 0;SCL = 1;delay();SDA = 1;delay();void write_byte(uchar mm)/写一个字节 uchar i,temp; temp=mm; SCL=0; delay()

3、; for(i=0;i8;i+) SDA=(tempi)&0x80; /temp=temp1; /SDA=CY; delay(); SCL=1; delay(); SCL=0; delay(); SDA=1; delay();void yingda() uchar i; SCL=1; while(SDA=1)&(i250)i+; SCL=0; delay();uchar read_byte() uchar i,j,k; SCL=0; delay(); /SDA=1; /delay(); for(i=0;i8;i+) j=SDA; k=(k0;i-) for(j=100;j0;j-);void

4、display(long cc) P0=tablecc/1000|0x80; P1=0xfe; delay1(5); P1=0xff; P0=tablecc%1000/100; P1=0xfd; delay1(5); P1=0xff; P0=tablecc%1000%100/10; P1=0xfb; delay1(5); P1=0xff; P0=tablecc%10; P1=0xf7; delay1(5); P1=0xff;void main() unsigned int tt; float aa; init(); while(1) start();/开始 写数据 write_byte(0x90);/写器件地址 yingda();/应答 write_byte(0x00);/写存储地址 yingda();/应答 stop();/终止信号 delay1(50);/延时，让IIC有足够的处理时间 start();/起始信号 write_byte(0x91);/选择读出来数据 yingda();/应答 tt=read_byte();/把数据传给tt stop();/停止 aa = tt* 0.01953; /转为电压值 tt = aa * 1000; display(tt); -