/* Name: ADC0809 digital-to-analog conversion and display
Description: ADC0809 sampling channel 3 input
Analog quantity, the converted result is displayed on the digital tube.
*/
#include
#define uchar unsigned char
#define uint unsigned int
//Digital tube segment code for each digit (common cathode)
uchar code DSY_CODE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
sbit CLK=P1^3; //clock signal
sbit ST=P1^2; //Start signal
sbit EOC=P1^1; //Conversion end signal
sbit OE=P1^0; //output enable
//Delay
void DelayMS(uint ms)
{
uchar i;
while(ms--) for(i=0;i<120;i++);
}
// Display the conversion result
void Display_Result(uchar d)
{
P2=0xf7; The 4th digital tube displays the unit digit
P0=DSY_CODE[d%10];
DelayMS(5);
P2=0xfb; The third digital tube displays the tens digit
P0=DSY_CODE[d%100/10];
DelayMS(5);
P2=0xfd; The second digital tube displays the hundreds digit
P0=DSY_CODE[d/100];
DelayMS(5);
}[page]
//Main program
void main()
{
TMOD=0x02; //T1 working mode 2
TH0=0x14;
TL0=0x00;
IE=0x82;
TR0=1;
P1=0x3f; //Select channel 3 (0111) of ADC0809 (P1.4~P1.6)
while(1)
{
ST=0;ST=1;ST=0; //Start A/D conversion
while(EOC==0); //Wait for the conversion to complete
OE=1;
Display_Result(P3);
OE=0;
}
}
//T0 timer interrupt provides clock signal to ADC0808
void Timer0_INT() interrupt 1
{
CLK=~CLK;
}
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