adc_drv.c

ATMEL公司AT89C51SND1为主控制器MP3源代码

/*C**************************************************************************
* NAME:         adc_drv.c
*----------------------------------------------------------------------------
* Copyright (c) 2003 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      snd1c-refd-nf-4_0_3      
* REVISION:     1.3     
*----------------------------------------------------------------------------
* PURPOSE:
* This file contains the A to D Converter driver routines
*
* NOTES:
* Driver Configuration:
*   - None
* Global Variables:
*   - None
*****************************************************************************/

/*_____ I N C L U D E S ____________________________________________________*/

#include "config.h"                         /* system configuration */
#include "adc_drv.h"                        /* adc driver definition */


/*_____ M A C R O S ________________________________________________________*/


/*_____ D E F I N I T I O N ________________________________________________*/


/*_____ D E C L A R A T I O N ______________________________________________*/


/*F**************************************************************************
* NAME: adc_set_prio
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   Set the ADC priority interrupt 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* ram/xram:
* cycle:
* stack: 
* code:
*****************************************************************************/
void adc_set_prio (Byte priority)
{
  if ((priority == 1) || (priority == 3))     /* set LSB priority bit */
  {
    IPL1 |=  MSK_EADC;
  }
  if ((priority == 2) || (priority == 3))     /* set MSB priority bit */
  {
    IPH1 |= MSK_EADC;
  }
}


/*L**************************************************************************
* NAME: adc_int
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   ADC interrupt function
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   ## Defined in an other c file ##
*   IRQ_ADC defined in extxxxx.h
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* ram/xram:
* cycle:
* stack: 
* code:
*****************************************************************************/
//Interrupt (adc_int(void), IRQ_ADC)