ADC控制与状态寄存器A ADCSRA 程序中其取值为0xE6(11100110),其最高位ADEN置位启动ADC,ADSC置位开始转换，ADATE置位启动ADC自动触发功能。ADCSRA的低3位ADPS[2:0]设置为110，分频比设为64。
Proteus运行截图：
Studio6.2编译通过截图：
程序清单：
- /*
- * GccApplication11.c
- *
- * Created: 2014-11-6 18:47:24
- * Author: Administrator
- */
- #define F_CPU 4000000UL
- #include <avr/delay.h>
- #include <avr/io.h>
- #include <stdint.h>
- const uint8_t SEG_CODE[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xFF};
- uint8_t Display_Buffer[] = {0,0,0,10,0,0,0,10};
- void ADC_Convert(uint8_t CH)
- {
- int Result;
- ADMUX = CH;
- Result = (int)((ADCL+(ADCH<<8))*500.0/1023.0);
- Display_Buffer[CH*4] = Result/100;
- Display_Buffer[CH*4 +1] = Result/10 % 10;
- Display_Buffer[CH*4 +2] = Result % 10;
- }
- int main(void)
- {
- uint8_t i;
- DDRA = 0xFC;
- DDRC = 0xFF;PORTC = 0x00;
- DDRD = 0xFF;PORTD = 0x00;
- ADCSRA = 0xE6;
- _delay_ms(3000);
- while(1)
- {
- ADC_Convert(0); ADC_Convert(1);
- for(i=0;i<8;i++)
- {
- PORTC = 0xFF;
- PORTD = _BV(i);
- PORTC = SEG_CODE[Display_Buffer[i]];
- if(i==0||i==4) PORTC &= 0x7F;
- _delay_ms(4);
-
- }
- }
-
-
- }
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