[技术问答] 问个ML51ADC库函数问题

  

  /**

  * [url=home.php?mod=space&uid=247401]@brief[/url] This API configures ADC module to be ready for convert the input from selected channel

  * @param[in] u8OpMode Decides the ADC operation mode. Valid values are:

  *                       - \ref ADC_SINGLE               :Single mode.

  *                       - \ref ADC_CONTINUOUS           :Continuous scan mode.

  * @param[in] u8ChMask Channel enable bit. Each bit corresponds to a input channel. 0 is channel 0, 1 is channel 1..., 7 is channel 7.

  *              VBG means band-gap voltage, VTEMP means temperature sensor, VLDO means LDO voltage.

  * [url=home.php?mod=space&uid=266161]@return[/url]  None

  * [url=home.php?mod=space&uid=536309]@NOTE[/url] ML51 series MCU ADC can only convert 1 channel at a time. If more than 1 channels are enabled, only channel

  *       with smallest number will be convert.

  * @exmaple :  ADC_Open(ADC_SINGLE,0);

  */

void ADC_Open(unsigned char u8ADCOpMode, unsigned char u8ADCChMask)

{

  set_ADCCON1_ADCEN;                              /* enable ADC circuit*/

  switch (u8ADCOpMode)                            //ADC signle mode or continus mode select

  {

    case ADC_SINGLE:     SFRS=0x00;ADCCON1&=0xEF; break;

    case ADC_CONTINUOUS: SFRS=0x00;ADCCON1|=0x10; break;

    default: break;

  }

  

  switch (u8ADCChMask)                            //ADC input channel digtial function disable

  {

    case 0: SFRS=0x00;ADCCON0&=0xF0;                                           AINDIDS=0xFE;MFP_P25_ADC_CH0;P25_INPUT_MODE; break;

    case 1: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x01;SFRS=0x01;AINDIDS=0xFD;MFP_P24_ADC_CH1;P24_INPUT_MODE; break;

    case 2: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x02;SFRS=0x01;AINDIDS=0xFB;MFP_P23_ADC_CH2;P23_INPUT_MODE; break;

    case 3: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x03;SFRS=0x01;AINDIDS=0xF7;MFP_P22_ADC_CH3;P22_INPUT_MODE; break;

    case 4: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x04;SFRS=0x01;AINDIDS=0xEF;MFP_P21_ADC_CH4;P21_INPUT_MODE; break;

    case 5: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x05;SFRS=0x01;AINDIDS=0xDF;MFP_P20_ADC_CH5;P20_INPUT_MODE; break;

    case 6: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x06;SFRS=0x01;AINDIDS=0xBF;MFP_P31_ADC_CH6;P31_INPUT_MODE; break;

    case 7: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x07;SFRS=0x01;AINDIDS=0x7F;MFP_P32_ADC_CH7;P32_INPUT_MODE; break;

    case VBG:   SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x08; break;

    case VTEMP: SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x09; break;

    case VLDO:  SFRS=0x00;ADCCON0&=0xF0;ADCCON0|=0x0A; break;

  }

}