ad_convert.c

uccos2的的源码文件

/****************************************Copyright (c)**************************************************

********************************************************************************************************/
#define  IN_ADCONVERT
#include "config.h"

extern OS_EVENT *QSem;

/********************************************
*  *funcition:send the converted value to queue
********************************************/
void read_value(void)
{
	uint32 txmsg;	

	txmsg=(uint32)rADCDAT0 & 0x3ff;
	OSQPost(QSem, (void *)&txmsg);		//send a message
}

/********************************************
*  *
********************************************/
void AD_Exception(void)
{
	rSUBSRCPND = (1<<10);	//sub source pending
	rINTPND = rINTPND;

	rSRCPND = (1 << 31);		
	rINTPND = rINTPND;
	
	read_value();
}

/*******************************************
*  *
*******************************************/
void AD_init(void)
{
	rCLKCON |= 1<<15;					//enable the ADC clock
	rINTSUBMSK &=~(1<<10);				//
	
	VICVectAddr[31] = (uint32) AD_Exception;
	rINTMSK &= ~(1<<31);			// 打开AD中断允许
}

/**********************************************
*  *
**********************************************/
void start_adc(uint32 chanel)
{
	int i;
    	static int prevCh=-1;
	uint32 preScaler;
		
	preScaler = 50000000/ADC_FREQ -1;               			

    	rADCCON = (1<<14) | (preScaler<<6) | (chanel<<3);			//setup channel

	rADCCON|=0x1;			//start AD convert
	//while(rADCCON & 0x1);	//check if Enable_start is low
}

//---------------------------------------end------------------