请帮我看看下面的程序:
#include<avr/io.h>
#include<avr/interrupt.h>
#define __disable_interrupt() asm("cli") //Turn off global interrupt
#define __enable_interrupt() asm("sei") //Turn on global interrupt
unsigned char ADC_valH = 0;
unsigned char ADC_valL = 0;
unsigned char first1 = 0;
unsigned char first2 = 0;
void ADC2_ini(void)
{
ADCSRB = 0x40;
ADMUX = 0x42;
ADCSRA = 0xEF; // ADC2使能,free run模式
}
SIGNAL(ADC_vect) // ADC Conversion Complete interrupt service routine
{
if(ADC_valH != (ADCH& 0x03) || ADC_valL != ADCL)
{
ADC_valH = ADCH & 0x03;
ADC_valL = ADCL;
UART_transmit(ADC_valH);
UART_transmit(ADC_valL); //如果ADC转换值变化就发送新值
}
}
void Comparator_ini(void)
{
ACSR = ACSR & 0xF7; //ensure interrupt is off before changing
ADCSRB = 0x40;
DIDR1 = 0x03;
ADMUX = 0x00;
ACSR = 0x08; // AIN0接正输入,ADC0接负输入,比较器变化就产生中断
}
SIGNAL(ANALOG_COMP_vect) // Analog Comparator interrupt service routine
{
sends("Comparator changed!");
UART_transmit('\n');
}
void UART3_ini(void)
{
//UART3 口
UCSR3B = 0x00; //disable while setting baud rate
UCSR3C = 0x06; //异步，8位数据，无奇偶校验，一个停止位，无倍速
UBRR3L = 0x67; //baudrate = 9600 at system clk = 16MHz
UBRR3H = 0x00;
UCSR3B = 0x98; //接收中断使能，接收允许，发送允许
}
void UART_transmit(unsigned char dat)
{
while ( !( UCSR3A & (1<<UDRE3)) );
UDR3 = dat;
}
void sends(unsigned char *ptr)
{
while (*ptr)
{
UART_transmit(*ptr++);
}
}
int main(void)
{
__disable_interrupt();
//上电默认DDRx=0x00,PORTx=0x00 输入，无上拉电阻
PORTA = 0xFF; //不用的管脚使能内部上拉电阻
DDRD = 0xC0;
PORTD = 0xC0;
UART3_ini();
__enable_interrupt();
while(1)
{
if(PINJ & 0x04)
{
if(first1 ==0)
{
ADCSRA = 0x00;
Comparator_ini();
first1 = 0xaa;
first2 = 0;
sends("Comparator enable! ADC disable!");
UART_transmit('\n');
}
PORTD = 0x80;
}
else
{
if(first2 == 0)
{
ACSR = 0x00;
ADC2_ini();
first1 = 0;
first2 = 0xaa;
sends("ADC enable! Comparator disable!");
UART_transmit('\n');
ADCSRA = (1<<ADSC); // 启动ADC
}
PORTD = 0x40;
}
}
return 0;
}
SIGNAL(USART3_RX_vect) // USART Receiver interrupt service routine
{
UART_transmit(UDR3);
}
PJ2是个摇杆开关,用于选择使能比较器使能或ADC使能.
当使能比较器时,输出如下:
Comparator changed!
Comparator enable! ADC disable!
然后再怎么改变负端的电压也不会再产生输出了.
不知为什么?
当使能ADC时,输出如下:
ADC enable! Comparator disable!
改变ADC2的输入电压没输出,
好象没有进入到ADC的中断中.
请帮忙,谢谢!! |
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