//ICC-AVR application builder : 2007-7-17 16:07:21
// Target : M8
// Crystal: 8.0000Mhz
#include <iom8v.h>
#include <macros.h>
unsigned char valu;
unsigned char led[6]={1,0,0,0,0,6};
unsigned int i;
void delay(unsigned int t) //延迟
{unsigned char w;
w=t*1000;
while(w>=0)
{w--;
}
}
void xs_zh(unsigned char b) //扫描显示
{
PORTD = (PIND & 0x27) | (0xc0 & led<<4) | (0x18 & led<<3);
}
void port_init(void)
{
PORTB = 0x00;
DDRB = 0x00;
PORTC = 0x00; //m103 output only
DDRC = 0x0E;
PORTD = 0x00;
DDRD = 0xD8;
}
//TIMER0 initialize - prescale:64
// desired value: 2mSec
// actual value: 2.000mSec (0.0%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop
TCNT0 = 0x06; //set count
TCCR0 = 0x01; //start timer
}
#pragma interrupt_handler timer0_ovf_isr:10 //用中断来扫描显示
void timer0_ovf_isr(void)
{
TCNT0 = 0x06; //reload counter value
PORTC |= 0x0E;//先关闭显示
xs_zh(i); //送显示数据
PORTC = (PINC & 0xf1) | (0x0e &i<<1); //开显示
i++; //准备显示下一位
if(i>=6)i=0;
}
//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
port_init();
timer0_init();
MCUCR = 0x00;
GICR = 0x00;
TIMSK = 0x01; //timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
/*——————————————————————————————————————————————*/
void adc_cov(void) //AREF接AVCC(5V)
{unsigned int temp1;
unsigned int temp2;
ADMUX=0X60;
ADCSRA=0XC3;
delay(1);
while(!(ADCSRA&(1<<ADIF)));
ADCSRA&=~(1<<ADIF);
ADCSRA&=~(1<<ADEN);
temp1=(unsigned int)ADCL;
temp2=(unsigned int)ADCH;
valu=(temp2<<8)+temp1;
}
void pocess(void)
{
led[2]=valu/100;
valu%=100;
led[1]=valu/10;
valu%=10;
led[0]=valu;
led[3]=0;
led[4]=0;
led[5]=0;
}
void main(void)
{
init_devices();
while(1)
{
adc_cov();
pocess();
delay(10);
}
}
请问一下各位大哥，我这个程序从PC1，2，3输出到74LS138片选LED，从PD3，4，6，7输出BCD码到74LS47译码到LED段码。怎么现在显示出来的只是我初始化的数据，说明AD转换没有问题了，难道我的AD转换就没有出数据吗？急，请指教，谢谢了！ |
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