init_adc.c

单片机C语言编程ad转换程序,大家共享.请大家多提意见

/**********************************************************************
* ?2006 Microchip Technology Inc.
*
* FileName:        init_ADC.c
* Dependencies:    p33FJ128GP206.h
* Processor:       dsPIC33F
* Compiler:        MPLAB?C30 v2.01 or higher
*
* SOFTWARE LICENSE AGREEMENT:
* Microchip Technology Inc. (揗icrochip? licenses this software to you
* solely for use with Microchip dsPIC?digital signal controller
* products. The software is owned by Microchip and is protected under
* applicable copyright laws.  All rights reserved.
*
* SOFTWARE IS PROVIDED 揂S IS.? MICROCHIP EXPRESSLY DISCLAIMS ANY
* WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL MICROCHIP
* BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES, LOST PROFITS OR LOST DATA, HARM TO YOUR EQUIPMENT, COST OF
* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF),
* ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER SIMILAR COSTS.
*
* REVISION HISTORY:

*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* ADDITIONAL NOTES:
*
*
**********************************************************************/


#include "p33FJ64GP206.h"

       
/*---------------------------------------------------------------------
  Function Name: Init_ADC
  Description:   Initialize ADC module
  Inputs:        None
  Returns:       None
-----------------------------------------------------------------------*/
void Init_ADC( void )
{

	TRISBbits.TRISB5=1;
	/* set port configuration here */ 		
 	AD1PCFGLbits.PCFG5 = 0;		// ensure AN5/RB5 is analog (Temp Sensor)
 
 	/* set channel scanning here, auto sampling and convert, 
 	   with default read-format mode */
	AD1CON1 = 0x04E4;
	/* select 12-bit, 1 channel ADC operation */
//	AD1CON1bits.AD12B = 1;
	
	/* enable DMA mode (ADC module sends all results 
	   to ADBUF0 and interrupts on each result */
//	ADCON1bits.ADDMAEN = 1;
	
	/* No channel scan for CH0+, Use MUX A,  
	   SMPI = 1 per interrupt, Vref = AVdd/AVss */
	AD1CON2 = 0x0000;
	
	/* Set Samples and bit conversion time */
	AD1CON3 = 0x1f1f;		//

        	
	/* set channel scanning here for AN4 and AN5 */
	AD1CSSL = 0x0000;
	
	/* channel select AN5 */
	AD1CHS0 = 0x0005;
	/* reset ADC interrupt flag */
	IFS0bits.AD1IF = 0;           

	/* enable ADC interrupts, disable this interrupt if the DMA is enabled */	  
	IEC0bits.AD1IE = 1;       

	/* turn on ADC module */
	AD1CON1bits.ADON = 1;          	
}