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调试5：温度测定，AD数据采集
今天把AD采样程序给调试成功了。
1、图片


2、视频：

3、关键代码：
系统初始化：
void systeminit(void)
{
 PIOR = 0x00U;
 CG_ReadResetSource();
 PORT_Init();
 CLOCK_Init();
 NOKIA_5110_init();//这里用到了显示屏
 AD_Init();//AD采样的初始化
 IT_Init();
 CRC0CTL = 0x00U;
 IAWCTL = 0x00U;
}

主程序：

void  main(void)
{
 /* Start user code. Do not edit comment generated here */

        /* Peripheral start function calls */
        IT_Start();                   /* Start Interval Timer */
        ADC_Init_ResultBuffer();
        AD_ComparatorOn();            /* Enable ADC voltage comparator (ADCE = on) */
        UINT i;
        for (i=0; i < 100; i++)
         {
            NOP();
         }
           
        AD_Start();                   /* Start ADC (ADCS = 0n) */
//显示屏的初始化显示
        NOKIA_5110_write_chinese_string(0,0,12,7,0,0);//瑞萨开发板试用
        NOKIA_5110_write_chinese_string(0,2,12,3,7,0);//电压
        NOKIA_5110_write_chinese_string(0,4,12,3,10,0);//温度
        NOKIA_5110_write_chinese_string(73,4,12,1,13,0);//度
        lcdUpdateChar(2,7,'.');
        lcdUpdateChar(2,13,'V');
        lcdUpdateChar(4,8,'.');
        /* Endless control loop */
 while (1U)
 {
           
            /* ADC Conversions (External Voltage, Temperature and Reference Voltage)  */
            while (!ADIF) {}                                 // Wait for first AD conversion completion
            ADIF = 0;
            temp_read = (USHORT)(ADCR >> 6U);                // Ignore first ADC reading
          
            ADC_Calculation_Ref();                           // Calculate internal reference voltage value
            AD_SelectADChannel(ADCHANNEL2);                  // Switch to external voltage (Channel 2)
            for (i=0; i < 100; i++)
            {
                NOP();
            }
           
            ADC_Calculation_ExtVoltage();                    // Calculate external voltage value
            AD_SelectADChannel(ADTEMPERSENSOR0);             // Switch to temperature sensor channel
            for (i=0; i < 500; i++)
            {
                NOP();
            }
           
            ADC_Calculation_Temp();                          // Calculate temperature value
            AD_SelectADChannel(ADTEMPERSENSOR1);             // Switch to internal reference voltage channel
            for (i=0; i < 100; i++)
            {
                NOP();
            }
           
            LCD_Accel_Value2(2,6,(int)(g_voltage*1000));          //转换电压值
            LCD_Accel_Value(4,6,(int)(g_temperature*100));      //转换温度

 }

其中：
void AD_Init(void)
{
 ADCEN = 1U; /* supply AD clock */
 ADM0 = _00_AD_ADM0_INITIALVALUE; /* disable AD conversion and clear ADM0 register */
 ADMK = 1U; /* disable INTAD interrupt */
 ADIF = 0U; /* clear INTAD interrupt flag */
 /* Set INTAD low priority */
 ADPR1 = 1U;
 ADPR0 = 1U;
 ADPC = _04_AD_ADPC_3ANALOG;
 /* Set ANI0 - ANI2 pin as analog input */
 PM2 |= 0x07U;
 ADM0 = _20_AD_CONVERSION_CLOCK_6 | _00_AD_TIME_MODE_STANDARD_1 | _00_AD_OPERMODE_SELECT;
 ADM1 = _00_AD_TRIGGER_SOFTWARE | _00_AD_CONVMODE_CONSELECT;
 ADM2 = _00_AD_POSITIVE_VDD | _00_AD_NEGATIVE_VSS | _00_AD_AREA_MODE_1 | _00_AD_RESOLUTION_10BIT;
 ADUL = _FF_AD_ADUL_VALUE;
 ADLL = _00_AD_ADLL_VALUE;
 ADS = _81_AD_INPUT_TEMPERSENSOR_1;
}

void AD_Start(void)
{
 ADIF = 0U; /* clear INTAD interrupt flag */
 ADMK = 0U; /* enable INTAD interrupt */
 ADCS = 1U; /* enable AD conversion */
}


void ADC_Init_ResultBuffer(void)
{
        UCHAR i;
        for (i = 0 ; i < 10 ; i++)
        {
          ADC_result[i] = 0;                  // Clear ADC result buffer
        }
}

void ADC_Calculation_ExtVoltage(void)
{
  if (samples >= 3)
      {
        samples = 0;
      }
  AD_Read(&ADC_result[samples]);                                   // Store the conversion result in the buffer
  temp = (float) 1.44 / g_ref_hexvalue;
  g_voltage = (float) ((ADC_result[samples] & 0xFFFC) * temp);     // Calculate the external voltage value
  samples++;
 
}

void ADC_Calculation_Temp(void)
{
  if (samples >= 3)
      {
        samples = 0;
      }
  AD_Read(&ADC_result[samples]);                                                           // Store the conversion result in the buffer
  temp = (float) 1.44 / g_ref_hexvalue;
  g_temperature = (float) (25 - ((((ADC_result[samples] * temp) - 1) * 1000) / 3.6));      // Calculate the temperature value in 癈
  samples++;
 
}

void ADC_Calculation_Ref(void)
{
  if (samples >= 3)
      {
        samples = 0;
      }
  AD_Read(&ADC_result[samples]);                            // Store the conversion result in the buffer
  g_ref_hexvalue = ADC_result[samples];
  samples++;
 
}


读取数据
void AD_Read(USHORT *buffer)
{
 *buffer = (USHORT)(ADCR >> 6U);
}

//选择通道
MD_STATUS AD_SelectADChannel(enum ADChannel channel)
{
 MD_STATUS status = MD_OK;

 if (((channel > ADCHANNEL7) && (channel < ADCHANNEL16)) || ((channel > ADCHANNEL19) && (channel < ADTEMPERSENSOR0)) || (channel > ADTEMPERSENSOR1))
 {
  status = MD_ARGERROR;
 }
 else
 {
  ADS = (UCHAR)channel;
 }

 return (status);
}