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ADC0809模數轉換與顯示實例
以下51單片機加ADC0809模數轉換與顯示實例對于初學者學習A/D原理很有幫助。
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#include <reg52.h> #define uint unsigned int #define uchar unsigned char uchar code LEDData[]= //定義數碼管數字 { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f };
sbit OE = P1^0; sbit EOC = P1^1; sbit ST = P1^2; sbit CLK = P1^3;
void DelayMS(uint ms) { //延遲模塊 uchar i; while(ms--) { for(i=0;i<120;i++); } } void Display_Result(uchar d) { //A/D轉換結果返回模塊 P2 = 0xf7; P0 = LEDData[d%10]; DelayMS(5); P2 = 0xfb; P0 = LEDData[d%100/10]; DelayMS(5); P2 = 0xfd; P0 = LEDData[d/100]; DelayMS(5); } void main() { TMOD = 0x02; TH0 = 0x14; TL0 = 0x00; IE = 0x82; TR0 = 1; P1 = 0x3f; while(1) { ST = 0; ST = 1; ST = 0; while(EOC == 0); OE = 1; Display_Result(P3); OE = 0; } } void Timer0_INT() interrupt 1 //中斷程序 { CLK = !CLK; }
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