AVR单片机ADC转换程序 单片机, 程序, 通道

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//基准定义 #defineAD_ref_vref0x00//基准Vref
#defineAD_ref_avcc0x40//基准AVCC
#defineAD_ref_vref_in0xc0//基准内部Vref
#defineAD_refAD_ref_vref
//常量定义
//单端通道,不放大
#define AD_SE_ADC0 0x00//ADC0
#define AD_SE_ADC1 0x01//ADC1
#define AD_SE_ADC2 0x02//ADC2
#define AD_SE_ADC3 0x03//ADC3
#define AD_SE_ADC4 0x04//ADC4
#define AD_SE_ADC5 0x05//ADC5
#define AD_SE_ADC6 0x06//ADC6
#define AD_SE_ADC7 0x07//ADC7
//定义AD端口变量
#define AD_TEMPAD_SE_ADC0//ADC0
#define AD_VOUTAD_SE_ADC1//ADC1
#define AD_KEYINAD_SE_ADC2//ADC2
#defineAD_VINAD_SE_ADC3//ADC3
#define AD_IOUTAD_SE_ADC4//ADC4
#define AD_6BATAD_SE_ADC5//ADC5
#defineBAT_SE_PORTPORTB
#defineBAT_EN_PORTPORTB
#defineBAT_EN_PIN0X03
void adc_init(void)
{
DDRA=0x00;
ADCSRA=(1<<ADEN)|(1<<ADPS2)|(0<<ADPS1)|(1<<ADPS0); 32分频 </ADEN)|(1<<ADPS2)|(0<<ADPS1)|(1<//ADMUX=(1<<REFS0); </REFS0);//DIDR0=(1<<ADC5D)|(1<<ADC4D)|(1<<ADC3D)|(1<<ADC2D)|(1<<ADC1D)|(1<<ADC0D); p="" 数据端口禁止 </ADC5D)|(1<<ADC4D)|(1<<ADC3D)|(1<<ADC2D)|(1<<ADC1D)|(1<}
unsigned int read_adc(unsigned char adc_input,unsigned char i)//查询方式读取ADC单端通道
{
unsigned charx;
unsigned inty=0;
ADC=0;
    ADMUX=(AD_ref|adc_input);//adc_input:单端通道 0x00~0x07,0x1E,0x1F
    //0xc0:选择内部2.56V参考电压
delay_nus(100);
for(x=0;x<I;X++) </I;X++){
    ADCSRA|=(1<<ADSC); p="" 启动ad转换     loop_until_bit_is_set(ADCSRA,ADIF);//方法1 等待AD转换结束
//  while ((ADCSRA&(1<<ADIF))==0); p="" 写法2="" 这种写法优化不好 //  loop_until_bit_is_clear(ADCSRA,ADSC);//方法2 检测ADSC=0也行
    ADCSRA|=(1<<ADIF); p="" 写1清除标志位 y += ADC;//ADC=ADCH:ADCL
}
    return y;
}