adc.c

(AD9958用ADuC845控制的keil源代码包,键盘和显示部分在另一个板上

/**********************************************
   ADC.C file
   The ADuc841's ADC Operation
   Creat by Computer-lov Date: 2005.8.30
   Last edit date:2005.8.30
   Copyright(C) 2005-2015 Computer-lov
   All rights reserved
************************************************/

#include "ADC.H"

//***************************  select ADC channel *************
void set_channel(unsigned char ch)
{
 ch&=0x0F;
 ADCCON2=(ADCCON2&0xF0)|ch;
}
//*************************************************************

//***************************  ACD initialization *************
void ADC_init(void)
{
 ADCCON1=0x0C;
 ON_ADC();
// OFF_ADC();
// SET_EX_REF();
 SET_IN_REF();
 ADCCON2=0x07;
 ADCCON3=0x14;  //Number of Averages = 63
 offset_calibration();
 gain_calibration();
}
//*************************************************************

//**************************** Wait for end of ADC conversion **
void wait_end_of_ADC(void)
{
 while(ADCCON3&0x80);
}
//***************************************************************

//***************************  Offset calibration. **************
void offset_calibration(void)
{
 ADCCON3&=~0x02;
 ADCCON3|=0x01;
}
//***************************************************************

//***************************  Gain calibration. ****************
void gain_calibration(void)
{
 ADCCON3|=0x02;
 ADCCON3|=0x01;
}
//***************************************************************