📄 [原创]带spi接口的16位ad7705驱动程序[avr论坛].htm
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<P>最近在做一个印度项目时，应用到16位AD转换器AD7705，此器件<SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">是<SPAN
lang=EN-US>AD公司推出的双通道16位∑－Δ（电荷平衡式）A/D转换器。具有高分辨率、宽动态范围、自校准，低功耗及优良的抗噪声性能，因此非常适用于仪表测量和工业控制等领域。<SPAN
lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">16位无丢失代码；0.003％的非线性度；内部放大器可选择1，2，4，8，16，32，64，128；8种增益；输出数据更新速率可编程；具有自校准和系统校准功能，三线串行接口，可缓冲模拟输入；低功耗。经努力，目前已调通一个通道，现将驱动程序共享，愿起到抛砖引玉的作用。此程序在项目板上调试通过，而且测试精度极高，显示的电压值准确稳定。</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">#include
<iom16v.h><BR>#include <macros.h><BR>#include
"delay.h"<BR>#include "ylkz_io.h"<BR>#include "FYD_12864_B.h"<BR>#include
"AD7705.h"</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">//数据类型的定义<BR>#define
uchar unsigned char <BR>#define uint unsigned int<BR>#define spk_f
230</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">//全局变量定义<BR>uint
vol;</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">/********************************<BR>*
器件端口初始化函数 *<BR>********************************/<BR>void
port_init(void)<BR>{<BR>PORTA = 0b00001111;<BR>DDRA = 0b00110000;<BR>PORTB
= 0b00011000;<BR>DDRB = 0b00010111; //输出<BR>PORTC = 0xFF;<BR>DDRC =
0b11000000; //输入<BR>PORTD = 0b00011100;<BR>DDRD =
0b11010000;<BR>}</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">/*************************************<BR>*
蜂鸣器操作函数组
*<BR>*************************************/<BR>//无源蜂鸣器操作函数<BR>//入口：n响声次数，m响声时长1/10MS<BR>void
spk(uchar n,uint m)<BR>{<BR>uint a;<BR>CLI();
//暂停中断，以免影响声音<BR>for(;n;n--)<BR>{<BR>a=(m*100/spk_f)*5;
//计算循环次数<BR>for(;a;a--)<BR>{;<BR>SPK_TG;<BR>delay_us(spk_f);<BR>SPK_TG;<BR>delay_us(spk_f);<BR>}<BR>SPK_OFF;<BR>delay_ms(100);<BR>}<BR>SEI();
//开中断<BR>}</SPAN></SPAN></SPAN></P>
<P><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">/****************************<BR>*
电压显示函数 *<BR>* 入 口：da 电压数据 *<BR>****************************/<BR>void
dy_disp(uint da)<BR>{<BR>uchar
temp;<BR>locate(1,1);<BR>lcd("AD7705测试程序：");<BR>locate(2,2);<BR>lcd("一通道电压值");<BR>locate(3,3);<BR>temp=((da/1000)+0x30);<BR>wr_12864(1,temp);<BR>temp=(da%1000)/100+0x30;<BR>wr_12864(1,temp);<BR>temp=(da%100)/10+0x30;<BR>wr_12864(1,temp);<BR>temp=(da%10)+0x30;<BR>wr_12864(1,temp);<BR>lcd("mV");<BR>}</SPAN></SPAN></SPAN></P></DIV></TD></TR>
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">/************************************<BR>*
定时器1初始化函数 *<BR>* 功 能：定时读取AD7705数据 *<BR>* 定时时间：预分频64，定时500MS *<BR>*
实际定时：499.991mSec (0.0%) *<BR>************************************/<BR>void
timer1_init(void)<BR>{<BR>TCCR1B = 0x00; //停止定时器<BR>TCNT1H = 0x1F;
//装初值<BR>TCNT1L = 0x01;<BR>TCCR1A = 0x00;<BR>// TCCR1B = 0x03;
//启动定时器<BR>}<BR>/******************************<BR>* 定时器1中断函数
*<BR>******************************/<BR>#pragma interrupt_handler
timer1_ovf_isr:iv_TIMER1_OVF<BR>void timer1_ovf_isr(void)<BR>{<BR>TCNT1H =
0x1F; //重装初值<BR>TCNT1L = 0x01;<BR>LED_TG;
//工作指示灯闪亮<BR><BR>vol=ad7705();<BR>if(vol)<BR>{<BR>vol=(vol/131)*5;
//电压MV<BR>dy_disp(vol);<BR>}<BR>}</SPAN></SPAN></SPAN>
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN
lang=EN-US><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">/******************************<BR>*
器件初始化函数 *<BR>******************************/<BR>void
init_devices(void)<BR>{<BR>CLI();
//先关总中断<BR>port_init();<BR>timer1_init();<BR>MCUCR = 0x00;<BR>GICR =
0x00;<BR>TIMSK = 0x04; //开启中断源<BR>SEI();
//开总中断<BR>}</SPAN></SPAN></SPAN></P>
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