ads8320.c

AVR AT32与TIADS8320AD转换器的接口程序

#include "iom32v.h"


/*缩写定义*/
#define uchar unsigned char 
#define uint  unsigned int


static  unsigned char  channel[10]={0x05,0x45,0x25,0x65,0x00,
                                    0x04,0x02,0x06,0x01,0x03};
							

//读PortDIO口的一位
#define	Read_PortDIO_Bit(x)		    ((PIND & (1<<(x))) ? 1 : 0)	 
//将某一PortDIO口设着为1
#define	Write_PortDIO_Bit_Set(x)	(PORTD |= 1<<(x))	
//将某一PortDIO口清0         
#define	Write_PortDIO_Bit_Clear(x)	(PORTD &= ~(1<<(x)))	 
//将某一PortDIO口输入模式       
//#define Ctrl_PortDIO_Bit_In(x)      (DDRD &= ~(1<<(x));PORTD |= 1<<(x) )
#define Ctrl_PortDIO_Bit_In(x)      (DDRD &= ~(1<<(x)))
//将某一PortDIO口输出模式	         
#define Ctrl_PortDIO_Bit_Out(x)     (DDRD |= 1<<(x))	

/*定义AD8320ADC的接口管脚*/
#define Dclock   PD5
#define Dout     PD6
#define Cs_8320  PD7


#define MAKE_HIGH(_x)  Write_PortDIO_Bit_Set(_x)   
#define MAKE_LOW(_x)   Write_PortDIO_Bit_Clear(_x)
#define BIT_READ(_x)   Read_PortDIO_Bit(_x)
#define CFG_READ(_x)   Ctrl_PortDIO_Bit_In(_x)
#define CFG_WRITE(_x)  Ctrl_PortDIO_Bit_Out(_x)

void Delay_T(void)
{
 uchar i;
 for(i=0;i<10;i++);
}

//初始化ADS8320的端口
void Initial_ADC(void)
{
 CFG_WRITE(Dclock);
 CFG_READ(Dout);
 CFG_WRITE(Cs_8320);
 MAKE_HIGH(Cs_8320);
 MAKE_LOW(Dclock);
}

/*************ADS8320 AD_Converter********************/
uint ADS8320ADC(void)
{
	uchar i;
	uint x=0;
	MAKE_LOW(Dclock);
	MAKE_HIGH(Dout);
	MAKE_LOW(Cs_8320);
	while(1){
	MAKE_HIGH(Dclock); Delay_T();
	if(BIT_READ(Dout)==0)
	{
	 MAKE_LOW(Dclock);  Delay_T();
	 break;
	}
	MAKE_LOW(Dclock); Delay_T();
	}
	for(i=0;i<16;i++)
	{
		MAKE_HIGH(Dclock); Delay_T();	
		x<<=1;
		if(BIT_READ(Dout)) x++;
		MAKE_LOW(Dclock); Delay_T();
	}
	MAKE_HIGH(Cs_8320);
	x &= 0xffff;
	return (x);
}

/*CD4051 通道选择程序*/
//的电子开关端口初始化，默认选择v_test
void Channel_map_init(void)
{ 
 DDRB |= 0x07;
 PORTB &= 0xF8;
 DDRC |= 0x70;
 PORTC &= 0x8F;
 PORTB |= 0x07;
}

void Channel_map(uchar channel_num)
{
 uchar channel_LB=0,channel_HB=0;
 channel_LB=channel[channel_num]&0x07; //取通道号的后三位即U4 cd4051的ＡＢＣ
 channel_HB=channel[channel_num]&0x70; //取通道号的高三位即U6 cd4051的ＡＢＣ
 PORTB &= (channel_LB|0xF8);
 PORTB |= channel_LB;
 PORTC &= (channel_HB|0x8F);
 PORTC |= channel_HB; 
 Delay_T();
}