ltc2449.c.bak

LTC2449 AD转换 LTC2449 AD转换 LTC2449 AD转换

#define _LTC2449_C
#include <iom169v.h>
#include <macros.h>
#include <stdio.h>
#include "LTC2449.h"
#include "main.h"

void LTC2449_init()
{
	SET_CS;
	CLR_SCK;
	CLR_CS;	
}
unsigned long LTC2449_RW(unsigned int chunnel)
{
	unsigned char l;
	unsigned int AD_data=0;
	unsigned int setup=0xa050;
	CLR_CS;
	chunnel=chunnel<<8;chunnel&=0b0000011100000000;
	setup|=chunnel;
	while(SDO!=0)
	{;}
	for(l=0;l<32;l++)
	{
		if(l<13)
			{
				if((setup&0x8000)!=0)
					SET_SDI;
    		else 
    			CLR_SDI;
    		setup=setup<<1;
			}
		SET_SCK;
		if(l>2 && l<15)//取最高16位
			{
				AD_data=AD_data<<1;
		if(SDO!=0)
			AD_data|=0x0001;
		else 
			AD_data&=0xfffe;
			}
		CLR_SCK;
	}
	//SET_CS;
	return AD_data;
}