大神帮忙看下C8051F410程序下，ADC测电压，测得值一直为0X0fff满值

只看该作者 · 2018-6-12 15:45

void ADC_Init()
{
  ADC0MX = 0x12;       //P2.2模拟输入
  ADC0CF = 0x00;    //转换时间周期控制,右对齐,复位值0xF0;
  ADC0CN = 0x02;       //AD0EN=0,ADC0 Burst Mode Closed,写CNV启动中断
  ADC0TK = 0xF9;    //Pre-tracking mode  F8  3个 F9  4个
}

void Port_IO_Init()
{
P0MDIN = 0xFD;       //P0.1 模拟输入 MISO  0.5不能配置成模拟输出，否则接收不到数据
P1MDIN = 0xFB;       //P1.2 Vref模拟输入
P2MDIN = 0xFB;       //P2.2 ADC电压采集输入

P0MDOUT = 0x9D;       //P0.3,P0.4Tx,P0.7LYreset P0.0(SCK),P0.2(MOSI)推免输出
P1MDOUT = 0x40;       //P1.6 SPI CS 推免输ru
P2MDOUT = 0x1B;       //P2.0 SHT11 HTSCK,P2.1 SHT11 HTDATA,P2.3 GATE,P2.4 LY WK
P1SKIP = 0x07;    //X1,X2,Vref跳过
P2SKIP = 0x04;          //跳过P2.2 ADC输入
XBR0    = 0x03;    //UART0连接到端口
XBR1    = 0x50;    //使能
}
/******晶振初始化*******/
void Oscillator_Init()
{
  OSCXCN = 0x20;          //有源晶振2分频，11059200/2
  CLKSEL = 0x01;          //选择外部时钟
  OSCICN = 0x00;          //关闭内部时钟
}

/********中断初始化********/
void Interrupts_Init()
{
  EIE1    = 0x08;       //ADC转换结束中断使能
  IE       = 0x10;    //UART0中断使能
  ES0=1;
}
void UART_Init()
{
SCON0    = 0x10;
}

/********CPU初始化********/
void Init_Device(void)
{
  Timer_Init();
  UART_Init();
  SPI_Init();
  ADC_Init();
  Port_IO_Init();
  Oscillator_Init();
  Interrupts_Init();
  lcd_config();
}

void task（）
{
   switch(UARTCmd)
   {
      case 0x36:    if(Flag){
               Gate=0;
               AD0INT=0; //ADC中断完成标志
               for(i=0;i<200;i++){}///时间长了进不去中断
                           AD0EN=1;
                     Gate=1;
                     Flag=0;
                     }
                     else{
Gate=0;
         AD0EN=0;
   }break;
   default :    break;
}
}

//UART0中断
void UART0_ISR(void) interrupt 4
{
uint i;
if(RI0)
{
  UARTCmd = SBUF0;             //读缓冲区数据
  Delayms(10);    //不加延时会出错
  RI0=0;
  Flag=1;
}
}

void ADC_INTI(void) interrupt 10
{
  AD0INT=0;
  Gate=0;
  ADCtemp=(ADC0H|0xFFFF)<<8|ADC0L;
  ADCtemp=ADCtemp>>4;       //每次为连续转换1次结果8位结果
  DataTable[1]=ADCtemp;

  data_convertor( ADCtemp);  //液晶屏显示
  Display();
Gate=1;
Delayms(10);
}