init_adc.c.bak

diPIC 系列程序

/**********************************************************************
* ?2006 Microchip Technology Inc.
*
* FileName:        init_ADC.c
* Dependencies:    p33FJ256GP710.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:
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Author            Date      Comments on this revision
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Richard Fischer   07/14/05  ADC module initialization
* Priyabrata Sinha  01/27/06  Ported to non-prototype devices
*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* ADDITIONAL NOTES:
*
*
**********************************************************************/


#include "p33FJ256GP710.h"

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

	/*set port configuration here */ 		
 	AD1PCFGLbits.PCFG4 = 0;         // ensure AN4/RB4 is analog (Temp Sensor)
 	AD1PCFGLbits.PCFG5 = 0;         // ensure AN5/RB5 is analog (Analog Pot)
 
 	/*set channel scanning here, auto sampling and convert, with default read-format mode */
	AD1CON1 = 0x00E4;
	
	
	/* 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;//azg
	
	/* No channel scan for CH0+, Use MUX A,  
	   SMPI = 1 per interrupt, Vref = AVdd/AVss*/
	AD1CON2 = 0x0000;
	
	/* Set Samples and bit conversion time */
	AD1CON3 = 0x032F; 
        	
	/* 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;
	
	
	/*******************************************************************/
	// ADxCON1 = 0x000000
	// Bit15 ADON: ADC Operating Mode bit;"1" ADC module is operating
	// Bit14 undefine
	// Bit13 ADSIDL: Stop in Idle Mode bit "0" Continue module operation in Idle mode
	// Bit12 ADDMABM: DMA Buffer Build Mode bit
	// Bit11 undefine
	// Bit10 AD12B: 10-bit or 12-bit Operation Mode bit;"1"12-bit,1-channel ADC operation
	// Bit09 
	// Bit08 FORM<1:0>: Data Output Format bits;For 12-bit operation: 1 1.
		
	// Bit07 
	// Bit06 
	// Bit05 SSRC<2:0>: Sample Clock Source Select bits 
	//
	
	// Bit04 undefine
	// Bit03 SIMSAM: 12BitMode "0"Samples multiple channels individually in sequence
	// Bit02 ASAM: ADC Sample Auto-Start bit
	// Bit01 SAMP: ADC Sample Enable bit
	// Bit00 DONE: ADC Conversion Status bit;"1"ADC conversion cycle is completed	
	
	/******************************************************************/
	// ADxCON2 = 0x000000
	// Bit15
	// Bit14
	// Bit13 VCFG<2:0>: Converter Voltage Reference Configuration bits
	
	// Bit12 undefine
	// Bit11 undefine
	// Bit10 CSCNA: Input Scan Select bit
	// Bit09
	// Bit08 CHPS<1:0>: Channel Select bits;12Bit is 0 0
	
	// Bit07 BUFS: Buffer Fill Status bit (only valid when BUFM = 1)
	// Bit06 undefine
	
	// Bit05
	// Bit04
	// Bit03
	// Bit02 SMPI<3:0>: Increment Rate for DMA Addresses bits
	
	// Bit01 BUFM: Buffer Fill Mode Select bit
	// Bit00 ALTS: Alternate Input Sample Mode Select bit
	
	/******************************************************************/
	// ADxCON3 = 0x000000
	// Bit15 ADRC: ADC Conversion Clock Source bit
	// Bit14 undefine
	// Bit13 undefine
	// Bit12
	// Bit11
	// Bit10
	// Bit09
	// Bit08 SAMC<4:0>: Auto Sample Time bits
	
	// Bit07	
	// Bit06
	// Bit05
	// Bit04			
	// Bit03	
	// Bit02
	// Bit01
	// Bit00 ADCS<7:0>: ADC Conversion Clock Select bits	
	
	
	/******************************************************************/
	// ADxCON4 = 0x000000
	// Bit15
	// Bit14	
	// Bit03 undefine
	
	// Bit02 
	// Bit01
	// Bit00 DMABL<2:0>: Selects Number of DMA Buffer Locations per Analog Input bits
		
	
	/******************************************************************/
	// ADxCHS123 = 0x000000
	// Bit15
	// Bit11 undefine
	// Bit10
	// Bit09 CH123NB<1:0>: Channel 1, 2, 3 Negative Input Select for Sample B bits
	//		 Bit12Mode 0 0
	// Bit08 CH123SB: Channel 1, 2, 3 Positive Input Select for Sample B bit
	
	// Bit07
	// Bit03 undefine
	
	// Bit02	
	// Bit01
	// Bit00
	
		
}