AD7705的源程序 -- niao0311-- 编程爱好者博客

－－－－－－－－－－－－AD7705头文件开始－－－－－－－－－－－－－－－－－－－#ifndef _AD7705_H#define _AD7705_H//通讯寄存器地址定义#define WR_SETUP_REG 0x10 //选中写设置寄存器#define RD_SETUP_REG 0x18 //选中写设置寄存器#define WR_CLOCK_REG 0x20 //选中写时钟寄存器#define RD_DATA_REG 0x38 //选中数据寄存器读#define WR_OFFSET_REG 0x60 //选中写offset寄存器#define RD_OFFSET_REG 0x68 //选中读offset寄存器#define WR_FULL_REG 0x70 //选中写full scale寄存器#define RD_FULL_REG 0x78 //选中读full scale寄存器#define SYS_ZERO_CALI 0x80 //系统零校准模式#define SYS_FULL_CALI 0xC0 //系统满量程校准模式#define ZERO_CALIBRATION 0x00 //系统零校准#define FULL_CALIBRATION 0x01 //系统满量程校准//CLOCK寄存器设置，无分频，50HZ输出更新速率#define CLOCK_REG_SET 0X04//函数声明void reset_AD7705(void);unsigned char read_AD7705_byte(void);unsigned int read_AD7705_word(void);unsigned long int read_AD7705_dword(void);void write_AD7705_byte(unsigned char data);void write_AD7705_word(unsigned int data);void write_AD7705_dword(unsigned long int data);void ReadData7705(unsigned int *const pdata);void AD7705_calibration(void);void start_AD7705(void);#endif－－－－－－－－－－－AD7705主文件开始－－－－－－－－－－－－－－#include <util/delay.h>#include <avr/eeprom.h>#include "ad7705.h"#include "main.h"#include "crc16.h"#include "Usart.h"//针对四个量程的设置寄存器的设置内容//（1）对于单极性V级别输入0-5V、0-20mA、0-10V这三个量程，输入范围为0-2V，无极性，增益为1，缓冲模式--0-2V//（2）对于双极性V级别输入+-2.5V、+-5V这两个量程，输入范围为+-1V，双极性，增益为2，缓冲模式--+-2V//（3）对于双精度mV级别输入+-500mV，增益为4，双极性，缓冲模式--+-2V//（4）对双精度mV级别+-50mV，增益为32，双极性，缓冲模式--+-1.6V//----MD1(0) MD0(0) G2(0) G1(0) G0(0) B/U(0) BUF(0) FSYNC(0)--------------------// const unsigned char text_of_setup[4]={0X06,0X0A,0X12,0X2A}; //缓冲模式，数字滤波同步extern volatile unsigned char command[7]; //校准命令全局数组extern volatile unsigned char scale; //记录系统量程extern volatile unsigned char NO_CALI_TYPE; //未校准类型extern volatile unsigned long int ZS,GS; //当前量程的校准系数extern volatile unsigned char time_count; //超时标志//----------------------------------------------------------------------------//函数：reset_AD7705//功能：AD7705串行接口失步后将其复位。复位后要延时500us再访问//参数：无//返回：无//变量：无//备注：无//----------------------------------------------------------------------------void reset_AD7705(void){ unsigned char i; AD_DIN1; for( i=0; i<36; i++ ) { AD_CLK0; asm("nop"); asm("nop"); asm("nop"); AD_CLK1; asm("nop"); asm("nop"); asm("nop"); } _delay_us(30);}//------------------------------------------------------------------------------------------//函数：read_AD7705_byte//功能：从AD7705读一个字节的数据//参数：无//返回：读到的一字节数据//变量：无//备注：无//------------------------------------------------------------------------------------------unsigned char read_AD7705_byte(void){ unsigned char data = 0; unsigned char i = 0; for( i=0; i<8; i++ ) { data <<= 1; AD_CLK0; asm("nop"); asm("nop"); asm("nop"); if(AD_DOUT) { data++; } AD_CLK1; asm("nop"); asm("nop"); asm("nop"); } return data; }//------------------------------------------------------------------------------------------//函数：read_AD7705_word//功能：从AD7705读一个字的数据，共16bit//参数：无//返回：读到的一字节数据//变量：无//备注：无//------------------------------------------------------------------------------------------unsigned int read_AD7705_word(void){ unsigned int data = 0; unsigned char i = 0; for( i=0; i<16; i++ ) { data <<= 1; AD_CLK0; asm("nop"); asm("nop"); asm("nop"); if(AD_DOUT) { data++; } AD_CLK1; asm("nop"); asm("nop"); asm("nop"); } return data; }//------------------------------------------------------------------------------------------//函数：read_AD7705_dword//功能：从AD7705读一个24的数据//参数：无//返回：读到的一字节数据//变量：无//备注：AD7705是一个16位AD//------------------------------------------------------------------------------------------unsigned long int read_AD7705_dword(void){ unsigned long data = 0; unsigned char i = 0; for( i=0; i<24; i++ ) { data <<= 1; AD_CLK0; asm("nop"); asm("nop"); asm("nop"); if(AD_DOUT) { data++; } AD_CLK1; asm("nop"); asm("nop"); asm("nop"); } return data; }//------------------------------------------------------------------------------------------//函数：write_AD7705_byte//功能：往AD7705写8位数据//参数：IN - uint8_t data,要写入AD7705的数据//返回：无//变量：无//备注：无//------------------------------------------------------------------------------------------void write_AD7705_byte(unsigned char data){ for(unsigned char i=0; i<8; i++) { AD_CLK0; if(data&0x80) AD_DIN1; else AD_DIN0; asm("nop"); asm("nop"); asm("nop"); AD_CLK1; asm("nop"); asm("nop"); asm("nop"); data <<= 1; } AD_DIN1; }//------------------------------------------------------------------------------------------//函数：write_AD7705_dword//功能：往AD7705写24位数据,因为AD7705是24位的器件//参数：IN - int32_t data,要写入AD7705的数据//返回：无//变量：无//备注：无//------------------------------------------------------------------------------------------void write_AD7705_dword(unsigned long int data){ for(unsigned char i = 0; i<24; i++) { AD_CLK0; if(data&0x800000) AD_DIN1; else AD_DIN0; asm("nop"); asm("nop"); asm("nop"); AD_CLK1; asm("nop"); asm("nop"); asm("nop"); data <<= 1; } AD_DIN1;}//------------------------------------------------------------------------------------------//函数：AD7705_calibration//功能：根据cali_type的值对AD7705进行系统0校正或系统满量程校正，并将各校正值和校正标志存入// EEPROM，数据保存为双备份。数据块格式为: 内部0校正值(4byte), 内部满量程校正值(4byte), // 系统0校正值(4byte), 系统满量程校正值(4byte), 系统0校正标志(1byte),系统满量程校正标志// (1byte),CRC16校验值(2byte)，共20byte。//参数：IN - uint8_t board, 0 －对主板进行校正，1－对副板进行校正// IN - uint8_t range, 需要校正的量程// IN - uint8_t cali_type, 校正类型，ZERO_CALIBRATION－ 0校正；// FULL_CALIBRATION －满量程校正//返回：返回-1表示校准失败，非0表示校正成功，并返回相应的索引值//变量：无//备注：做满量程校正前必须先做零校正//------------------------------------------------------------------------------------------//校准命令格式 //STX Data Long Command Code Parameter CheckSum ETX//0x55 数据长度（2）量程指示 00H/01H CRC16(2) 0x0D////校准过程中要用到Command[]的数据，所以校准之前要关掉串口接收中断void AD7705_calibration(void){ //记录读取EEPROM的次数 unsigned char readtimes =0; //记录上位机发送的校准量程类型 unsigned char cali_scale =0; //读取24位校准系数的临时变量 unsigned long int temp =0; //临时的校准系数数组，存放格式ZSL、ZSM、ZSH；GSL、GSM、GSH；CRCL、CRCH //并在校准结束时作为参数传递给TXOUT()函数，发送校准系数给上位机 unsigned char coefficient[8] ={0}; //test[8]={0}; //16位校验和的临时变量 unsigned int crcvalue =0; AD_CS1; cali_scale = command[2]; //获取上位机发送的要校准的量程类型 //读取EEPROM的第一份校准系数 eeprom_busy_wait(); eeprom_read_block( &coefficient[0], (void*)(ADDR_EEPROM_1+(cali_scale-1)*10), 8 ); crcvalue = checksum( &coefficient[0], 6 ); //将6个值调用CRC校验函数得到校验 if( (coefficient[7]*256+coefficient[6]) != crcvalue ) { readtimes++; } //如果校准系数不可用则读取第二份 if( 1 == readtimes ) { eeprom_busy_wait(); eeprom_read_block( &coefficient[0], (void*)(ADDR_EEPROM_2+(cali_scale-1)*10), 8 ); crcvalue = checksum( &coefficient[0], 6 ); //将6个值调用CRC校验函数得到校验 if( (coefficient[7]*256+coefficient[6]) != crcvalue ) { readtimes++; } } //如果校准系数不可用则读取第三份 if( 2 == readtimes ) { eeprom_busy_wait(); eeprom_read_block( &coefficient[0], (void*)(ADDR_EEPROM_3+(cali_scale-1)*10), 8 ); } ADDR409_MASK; //切换到第一通道进行校准 AD_CS0; _delay_us(5); reset_AD7705(); //CLOCK寄存器设置，无分频，50HZ输出更新速率 write_AD7705_byte( WR_CLOCK_REG ); write_AD7705_byte( CLOCK_REG_SET ); if( ZERO_CALIBRATION == command[3] ) //校准命令为零校准 { //写设置寄存器,选择零校准 write_AD7705_byte( WR_SETUP_REG ); write_AD7705_byte( text_of_setup[cali_scale-1] | SYS_ZERO_CALI ); //等待校准完成,系统校准延时时间 start_timer0(); while( time_count < time_sys_cali ); stop_timer0(); while( AD_DRDY );//若将滤波器同步位FSYNC置为1，AD_DRDY信号将不会变低，这里将一直是死循环 //读OFFSET寄存器 write_AD7705_byte( RD_OFFSET_REG ); temp = read_AD7705_dword(); if( cali_scale == scale) { ZS = temp; //如果是当前量程零校准还要更新ZS //如果是当前量程的校准，还要将NO_CALI_TYPE赋值为1表示已经经过零校准 //更新上电没有校准时readEEPROM()函数的运行状态 NO_CALI_TYPE = NO_FULL_CALIBRATION; } coefficient[0] = (unsigned char)( temp%256 ); coefficient[1] = (unsigned char)( (temp/256)%256 ); coefficient[2] = (unsigned char)( (temp/65536)%256 ); } else if( FULL_CALIBRATION == command[3] )//系统满量程校准 { //计算ZS，一定要作强制类型转换，否则将出现错误 temp = (unsigned long int)(coefficient[0]) + (unsigned long int)(coefficient[1])*256 + (unsigned long int)(coefficient[2])*65536; //将ZS写入到AD7705的OFFSET寄存器 write_AD7705_byte( WR_OFFSET_REG ); write_AD7705_dword( temp ); //写设置寄存器，选择满量程校准 write_AD7705_byte( WR_SETUP_REG ); write_AD7705_byte( text_of_setup[cali_scale-1] | SYS_FULL_CALI ); //等待校准完成,系统校准延时时间 start_timer0(); while( time_count < time_sys_cali ); stop_timer0(); while( AD_DRDY );//若将滤波器同步位FSYNC置为1，AD_DRDY信号将不会变低，这里将一直是死循环 //读FULL寄存器 write_AD7705_byte( RD_FULL_REG ); temp = read_AD7705_dword(); if( cali_scale == scale ) { GS = temp; //如果是当前量程满量程校准还要更新GS //如果是当前量程的校准，还要将NO_CALI_TYPE赋值为2表示已经经过零校准 //更新上电没有校准的情况，让readEEPROM()函数退出循环状态 NO_CALI_TYPE = ALREADY_CALIBRATION; } coefficient[3] = (unsigned char)( temp%256 ); coefficient[4] = (unsigned char)( (temp/256)%256 ); coefficient[5] = (unsigned char)( (temp/65536)%256 ); } else { AD_CS1; _delay_us(5); return; } AD_CS1; _delay_us(5); crcvalue = checksum(&coefficient[0],6); //将6个校准值调用CRC校验函数得到校验码 coefficient[6] = (unsigned char)(crcvalue%256);//取校验值的高8位和低8位 coefficient[7] = (unsigned char)(crcvalue/256); //保存第一份校准系数 eeprom_busy_wait(); eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_1+(cali_scale-1)*10), 8 ); //保存第二份校准系数 eeprom_busy_wait(); eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_2+(cali_scale-1)*10), 8 ); //保存第三份校准系数 eeprom_busy_wait(); eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_3+(cali_scale-1)*10), 8 ); Txout( &coefficient[0] );//输出校准数据给上位机 return; }//------------------------------------------------------------------------------------------//函数：start_AD7705//功能：先写offset寄存器，再写full scale寄存器，然后启动7705进行单次转换//参数：uint8_t channel -- 要进行A/D转换的通道号// uint8_t cali -- 是第几次测量，电阻需要测量2次//返回：无//变量：无//备注：//------------------------------------------------------------------------------------------void start_AD7705(void){ reset_AD7705(); //写OFFSET寄存器 write_AD7705_byte( WR_OFFSET_REG ); write_AD7705_dword( ZS ); //写满量程校准寄存器 write_AD7705_byte( WR_FULL_REG ); write_AD7705_dword( GS ); //CLOCK寄存器设置，无分频，50HZ输出更新速率 write_AD7705_byte( WR_CLOCK_REG ); write_AD7705_byte( CLOCK_REG_SET ); //写设置寄存器 write_AD7705_byte( WR_SETUP_REG ); write_AD7705_byte( text_of_setup[scale-1] ); start_timer0(); while( time_count < time_read_data );//读取数据延时20ms左右, stop_timer0();}

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AD7705的源程序2008-02-22 22:25:00

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