lle_adc.c

BCM 控制demo源代码

/*******************************************************************************/
/**
Copyright (c) 2007 Freescale Semiconductor
Freescale Confidential Proprietary
\file       lle_ADC.c
\brief      Driver for basic S12XE ADC operation
\author     Freescale Semiconductor
\author     B05114
\version    0.1
\date       April/2007
*/
/*******************************************************************************/

/** S12X derivative information */ 
#include <MC9S12XEP100.h> 

/** Common defines and macros */
#include <hidef.h>   

/** Variable types and common definitions */
#include "typedefs.h"  


/*******************************************************************************/
/**
* \brief    ADC initialization
* \author   B05114
* \param    void
* \return   void
*/
void lle_Init_ADC(void)
{    
    ATD0CTL1_SRES = 0x02;       /* 12 bit resolution */
    ATD0CTL1_SMP_DIS = 1;       /* Discharge capacitor before sampling */
    
    ATD0CTL2_ETRIGE = 0;    /* Disable external trigger */
    ATD0CTL2_AWAI = 0;      /* No ATD conversions in stop mode */
    
    ATD0CTL3_DJM = 1;       /* Result right justified */
    
    ATD0CTL3_S8C = 0;       /* 1 conversion per sequence */
    ATD0CTL3_S4C = 0;
    ATD0CTL3_S2C = 0;
    ATD0CTL3_S1C = 1;
    
    ATD0CTL5_SCAN = 0;      /* Single conversion sequence */
    ATD0CTL5_MULT = 0;      /* Sample one channel */                   
}

/*******************************************************************************/
/**
* \brief    ADC calibration
* \author   B05114
* \param    void
* \return   void
*/

void lle_Calibrate_ADC(void)
{
    
   
}    

/*******************************************************************************/
/**
* \brief    ADC single conversion SW trigger
* \author   B05114
* \param    const unsigned int chan
* \return   unsigned int 
*/
    
UINT16 lle_ADC(UINT8 u8ADC_chan)
{
    ATD0CTL5_Cx = u8ADC_chan;   
    
        while(!ATD0STAT0_SCF);   /* Wait for end of conversion */ 
        
    ATD0STAT0_SCF = 1;      /* Clear flag */   
    
    return ATD0DR0;
} 

/*******************************************************************************/