8-AD7705的C51程序参考模板

1、AD7705的C51程序/*程序名称：16bitA/D AD7705驱动程序作者：shengtuo作者评价：测试过。工业低速测量广泛应用收集整理：amo*/sbit AdClk = P13; /*AD7705时钟脉冲*/sbit AdDout = P14; /*AD7705数据输出的反相脉冲*/sbit AdDin = P15; /*AD7705数据输入脉冲*/#define CH1 1 /*AD7705输入通道IN1*/#define CH2 2 /*AD7705输入通道IN2*/#define BIPOLAR 0 /*AD7705双极性输入*/#define UNIPOLAR 1 /*AD

2、7705单极性输入*/#define AD_CLK_WIDTH 1 /*AD7705串口时钟脉冲宽度*/* AD7705软件延时 */void Wait7705(unsigned int t)for( ;t>0 ;t- );/* 向AD7705写入一个字节 */void WriteByte7705(unsigned char x)unsigned char i;AdClk = 1;for (i=0; i<8; i+)AdClk=0;Wait7705(AD_CLK_WIDTH);AdDin =(bit) (x & 0x80);Wait7705(AD_CLK_WIDTH);Ad

3、Clk=1; Wait7705(AD_CLK_WIDTH);x <<=1;/* 从AD7705读一个字 */unsigned int ReadWord7705(void)unsigned char i;unsigned int x ;AdClk = 1 ;for (i = 0,x=0 ; i < 16 ; i+)1 / 6AdClk=0;Wait7705(AD_CLK_WIDTH);x<<=1;if (!AdDout) /* 光电耦合器反相 */x |= 0x01;AdClk=1;Wait7705(AD_CLK_WIDTH);return x;/* AD7705通

4、信端口复位 */void Reset7705(void)unsigned char i;for(i=0;i<35;i+) /* 多于连续32个 DIN=1 使串口复位 */AdClk=0;Wait7705(AD_CLK_WIDTH);AdDin =1;Wait7705(AD_CLK_WIDTH);AdClk=1;Wait7705(AD_CLK_WIDTH);/*AD7705初始化 输入通道channel -1=IN1,2=IN2;输入极性polarity-0=双极性,1=单极性; PGA 增益gain -1,2,4,8,16,32,64,128非缓冲模式*/void Init7705(u

5、nsigned char channel , bit polarity ,unsigned char gain)unsigned char x;Reset7705(); /* 防止串口失步 */WriteByte7705(0x20); /* 写ch0 clock register */WriteByte7705(0x00); /* 2.4576MHz时钟，20Hz数据更新速率 */WriteByte7705(0x21); /* 写CH1 clock register */WriteByte7705(0x00); /* 2.4576MHz时钟，20Hz数据更新速率 */if(channel=1)

6、 /* com register ,选择下步操作 setupregister */WriteByte7705(0x10);elseWriteByte7705(0x11);if(polarity) /* setup register */x=0x04;elsex=0x00;switch(gain)case 1 : x|=0x40;break;case 2 : x|=0x48;break;case 4 : x|=0x50;break;case 8 : x|=0x58;break;case 16 : x|=0x60;break;case 32 : x|=0x68;break;case 64 : x|

7、=0x70;break;case 128 : x|=0x78;break;default : x|=0x40;break;WriteByte7705(x);/* 读AD7705转换数据 输入通道channel -1=IN1,2=IN2;*/unsigned int GetData7705(unsigned char channel)if(channel=1)WriteByte7705(0x38);elseWriteByte7705(0x39);return ( ReadWord7705() );/*/*另外一个搜索到的：/*-AD7705-*/void select7705(uchar par

8、tnumber)switch(partnumber)case 1:PA18155=PA18155&0xfd;break;case 2:PA18155=PA18155&0xf7;break;default:break;void unselect7705(void)PA18155=PA18155|0x0f;void write_bit7705(uchar w_bit)if(w_bit=0)DIN7705=0;elseDIN7705=1;SCLK7705=0;SCLK7705=1;uchar read_bit7705(void)uchar r_bit;SCLK7705=0;SCLK7

9、705=1;if(DOUT7705=0)r_bit=0x00;elser_bit=0x80;return(r_bit);void write_part7705(uchar w_data)uchar index;uchar param;SCLK7705=1;for (index = 0; index<8; index+) /* Write out data */param = w_data<<index;param &= 0x80;write_bit7705(param);uchar read_part7705(void)uchar index;uchar r_data

10、=0;SCLK7705=1;for (index = 0; index<8; index+) /* Write out data */r_data |= read_bit7705()>>index;return(r_data);void wait7705(uchar channel)dowrite_part7705(channel | 0x08);while(read_part7705()&0x80);int ad7705(uchar partnumber,uchar channel)uchar i,hi_data,lo_data;uint all_data;ulon

11、g total_data;int sample_mv;total_data=0;select7705(partnumber);wait7705(channel);write_part7705(channel | 0x38);hi_data=read_part7705();lo_data=read_part7705();for(i=0;i<8;i+)dog();wait7705(channel);write_part7705(channel | 0x38);hi_data=read_part7705();lo_data=read_part7705();all_data=hi_data;al

12、l_data=(all_data<<8)|lo_data;total_data=total_data+all_data;sample_mv=(int)(total_data>>3)-32768);unselect7705();return(sample_mv);void ad7705s(uchar mode,uchar partnumber,uchar channel)uchar i;uchar j;dog();select7705(partnumber);write_part7705(channel | 0x20);write_part7705(0x0c);write_part7705(channel | 0x10);write_part7705(mode);wait7705(channel);write_part7705(channel | 0x60);j=(partnumber-1)*3+channel*3;for(i=0;i<3;i+)write_part7705(ad7705jzdataj+i);unselect7705();void ad7705z(uchar mode,uchar partnumber,ucharchannel,uchar x,uchar y)uchar i;uchar j;uchar m;dog();select770