AD7705的源程序

時間：2018-12-18 14:40:01

關鍵字： ad7705 源程序

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[導讀]－－－－－－－－－－－－AD7705頭文件開始－－－－－－－－－－－－－－－－－－－#ifndef _AD7705_H #define _AD7705_H //通訊寄存器地址定義 #define WR_SETUP_REG 0x10 //選中寫設置寄存器 #define RD_SETUP

－－－－－－－－－－－－AD7705頭文件開始－－－－－－－－－－－－－－－－－－－

#ifndef _AD7705_H
#define _AD7705_H
//通訊寄存器地址定義
#define WR_SETUP_REG 0x10 //選中寫設置寄存器
#define RD_SETUP_REG 0x18 //選中寫設置寄存器
#define WR_CLOCK_REG 0x20 //選中寫時鐘寄存器
#define RD_DATA_REG 0x38 //選中數(shù)據(jù)寄存器讀

#define WR_OFFSET_REG 0x60 //選中寫offset寄存器
#define RD_OFFSET_REG 0x68 //選中讀offset寄存器
#define WR_FULL_REG 0x70 //選中寫full scale寄存器
#define RD_FULL_REG 0x78 //選中讀full scale寄存器

#define SYS_ZERO_CALI 0x80 //系統(tǒng)零校準模式
#define SYS_FULL_CALI 0xC0 //系統(tǒng)滿量程校準模式
#define ZERO_CALIBRATION 0x00 //系統(tǒng)零校準
#define FULL_CALIBRATION 0x01 //系統(tǒng)滿量程校準
//CLOCK寄存器設置，無分頻，50HZ輸出更新速率
#define CLOCK_REG_SET 0X04
//函數(shù)聲明
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主文件開始－－－－－－－－－－－－－－
#include
#include

#include "ad7705.h"
#include "main.h"
#include "crc16.h"
#include "Usart.h"
//針對四個量程的設置寄存器的設置內容
//（1）對于單極性V級別輸入0-5V、0-20mA、0-10V這三個量程，輸入范圍為0-2V，無極性，增益為1，緩沖模式--0-2V
//（2）對于雙極性V級別輸入+-2.5V、+-5V這兩個量程，輸入范圍為+-1V，雙極性，增益為2，緩沖模式--+-2V
//（3）對于雙精度mV級別輸入+-500mV，增益為4，雙極性，緩沖模式--+-2V
//（4）對雙精度mV級別+-50mV，增益為32，雙極性，緩沖模式--+-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}; //緩沖模式，數(shù)字濾波同步
extern volatile unsigned char command[7]; //校準命令全局數(shù)組
extern volatile unsigned char scale; //記錄系統(tǒng)量程
extern volatile unsigned char NO_CALI_TYPE; //未校準類型
extern volatile unsigned long int ZS,GS; //當前量程的校準系數(shù)
extern volatile unsigned char time_count; //超時標志
//----------------------------------------------------------------------------
//函數(shù)：reset_AD7705
//功能：AD7705串行接口失步后將其復位。復位后要延時500us再訪問
//參數(shù)：無
//返回：無
//變量：無
//備注：無
//----------------------------------------------------------------------------
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);
}
//------------------------------------------------------------------------------------------
//函數(shù)：read_AD7705_byte
//功能：從AD7705讀一個字節(jié)的數(shù)據(jù)
//參數(shù)：無
//返回：讀到的一字節(jié)數(shù)據(jù)
//變量：無
//備注：無
//------------------------------------------------------------------------------------------
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;
}
//------------------------------------------------------------------------------------------
//函數(shù)：read_AD7705_word
//功能：從AD7705讀一個字的數(shù)據(jù)，共16bit
//參數(shù)：無
//返回：讀到的一字節(jié)數(shù)據(jù)
//變量：無
//備注：無
//------------------------------------------------------------------------------------------
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;
}
//------------------------------------------------------------------------------------------
//函數(shù)：read_AD7705_dword
//功能：從AD7705讀一個24的數(shù)據(jù)
//參數(shù)：無
//返回：讀到的一字節(jié)數(shù)據(jù)
//變量：無
//備注：AD7705是一個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;
}

//------------------------------------------------------------------------------------------
//函數(shù)：write_AD7705_byte
//功能：往AD7705寫8位數(shù)據(jù)
//參數(shù)：IN - uint8_t data,要寫入AD7705的數(shù)據(jù)
//返回：無
//變量：無
//備注：無
//------------------------------------------------------------------------------------------
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;
}
//------------------------------------------------------------------------------------------
//函數(shù)：write_AD7705_dword
//功能：往AD7705寫24位數(shù)據(jù),因為AD7705是24位的器件
//參數(shù)：IN - int32_t data,要寫入AD7705的數(shù)據(jù)
//返回：無
//變量：無
//備注：無
//------------------------------------------------------------------------------------------
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;
}
//------------------------------------------------------------------------------------------
//函數(shù)：AD7705_calibration
//功能：根據(jù)cali_type的值對AD7705進行系統(tǒng)0校正或系統(tǒng)滿量程校正，并將各校正值和校正標志存入
// EEPROM，數(shù)據(jù)保存為雙備份。數(shù)據(jù)塊格式為: 內部0校正值(4byte), 內部滿量程校正值(4byte),
// 系統(tǒng)0校正值(4byte), 系統(tǒng)滿量程校正值(4byte), 系統(tǒng)0校正標志(1byte),系統(tǒng)滿量程校正標志
// (1byte),CRC16校驗值(2byte)，共20byte。
//參數(shù)：IN - uint8_t board, 0 －對主板進行校正，1－對副板進行校正
// IN - uint8_t range, 需要校正的量程
// IN - uint8_t cali_type, 校正類型，ZERO_CALIBRATION－ 0校正；
// FULL_CALIBRATION －滿量程校正
//返回：返回-1表示校準失敗，非0表示校正成功，并返回相應的索引值

//變量：無
//備注：做滿量程校正前必須先做零校正
//------------------------------------------------------------------------------------------
//校準命令格式
//STX Data Long Command Code Parameter CheckSum ETX
//0x55 數(shù)據(jù)長度（2）量程指示 00H/01H CRC16(2) 0x0D
//
//校準過程中要用到Command[]的數(shù)據(jù)，所以校準之前要關掉串口接收中斷
void AD7705_calibration(void)
{
//記錄讀取EEPROM的次數(shù)
unsigned char readtimes =0;
//記錄上位機發(fā)送的校準量程類型
unsigned char cali_scale =0;
//讀取24位校準系數(shù)的臨時變量
unsigned long int temp =0;
//臨時的校準系數(shù)數(shù)組，存放格式ZSL、ZSM、ZSH；GSL、GSM、GSH；CRCL、CRCH
//并在校準結束時作為參數(shù)傳遞給TXOUT()函數(shù)，發(fā)送校準系數(shù)給上位機
unsigned char coefficient[8] ={0}; //test[8]={0};
//16位校驗和的臨時變量
unsigned int crcvalue =0;
AD_CS1;
cali_scale = command[2]; //獲取上位機發(fā)送的要校準的量程類型
//讀取EEPROM的第一份校準系數(shù)
eeprom_busy_wait();
eeprom_read_block( &coefficient[0], (void*)(ADDR_EEPROM_1+(cali_scale-1)*10), 8 );
crcvalue = checksum( &coefficient[0], 6 ); //將6個值調用CRC校驗函數(shù)得到校驗
if( (coefficient[7]*256+coefficient[6]) != crcvalue )
{
readtimes++;
}
//如果校準系數(shù)不可用則讀取第二份
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 ); //將6個值調用CRC校驗函數(shù)得到校驗
if( (coefficient[7]*256+coefficient[6]) != crcvalue )
{
readtimes++;
}
}
//如果校準系數(shù)不可用則讀取第三份
if( 2 == readtimes )
{
eeprom_busy_wait();
eeprom_read_block( &coefficient[0], (void*)(ADDR_EEPROM_3+(cali_scale-1)*10), 8 );
}
ADDR409_MASK; //切換到第一通道進行校準
AD_CS0;
_delay_us(5);
reset_AD7705();
//CLOCK寄存器設置，無分頻，50HZ輸出更新速率
write_AD7705_byte( WR_CLOCK_REG );
write_AD7705_byte( CLOCK_REG_SET );
if( ZERO_CALIBRATION == command[3] ) //校準命令為零校準
{

//寫設置寄存器,選擇零校準
write_AD7705_byte( WR_SETUP_REG );
write_AD7705_byte( text_of_setup[cali_scale-1] | SYS_ZERO_CALI );
//等待校準完成,系統(tǒng)校準延時時間
start_timer0();
while( time_count < time_sys_cali );
stop_timer0();
while( AD_DRDY );//若將濾波器同步位FSYNC置為1，AD_DRDY信號將不會變低，這里將一直是死循環(huán)
//讀OFFSET寄存器
write_AD7705_byte( RD_OFFSET_REG );
temp = read_AD7705_dword();
if( cali_scale == scale)
{
ZS = temp; //如果是當前量程零校準還要更新ZS
//如果是當前量程的校準，還要將NO_CALI_TYPE賦值為1表示已經(jīng)經(jīng)過零校準
//更新上電沒有校準時readEEPROM()函數(shù)的運行狀態(tài)
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] )//系統(tǒng)滿量程校準
{
//計算ZS，一定要作強制類型轉換，否則將出現(xiàn)錯誤
temp = (unsigned long int)(coefficient[0]) + (unsigned long int)(coefficient[1])*256
+ (unsigned long int)(coefficient[2])*65536;
//將ZS寫入到AD7705的OFFSET寄存器
write_AD7705_byte( WR_OFFSET_REG );
write_AD7705_dword( temp );
//寫設置寄存器，選擇滿量程校準
write_AD7705_byte( WR_SETUP_REG );
write_AD7705_byte( text_of_setup[cali_scale-1] | SYS_FULL_CALI );
//等待校準完成,系統(tǒng)校準延時時間
start_timer0();
while( time_count < time_sys_cali );
stop_timer0();
while( AD_DRDY );//若將濾波器同步位FSYNC置為1，AD_DRDY信號將不會變低，這里將一直是死循環(huán)
//讀FULL寄存器
write_AD7705_byte( RD_FULL_REG );
temp = read_AD7705_dword();
if( cali_scale == scale )
{
GS = temp; //如果是當前量程滿量程校準還要更新GS
//如果是當前量程的校準，還要將NO_CALI_TYPE賦值為2表示已經(jīng)經(jīng)過零校準
//更新上電沒有校準的情況，讓readEEPROM()函數(shù)退出循環(huán)狀態(tài)
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); //將6個校準值調用CRC校驗函數(shù)得到校驗碼
coefficient[6] = (unsigned char)(crcvalue%256);//取校驗值的高8位和低8位
coefficient[7] = (unsigned char)(crcvalue/256);
//保存第一份校準系數(shù)
eeprom_busy_wait();
eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_1+(cali_scale-1)*10), 8 );
//保存第二份校準系數(shù)
eeprom_busy_wait();
eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_2+(cali_scale-1)*10), 8 );
//保存第三份校準系數(shù)
eeprom_busy_wait();
eeprom_write_block( &coefficient[0], (void*)(ADDR_EEPROM_3+(cali_scale-1)*10), 8 );
Txout( &coefficient[0] );//輸出校準數(shù)據(jù)給上位機
return;
}
//------------------------------------------------------------------------------------------
//函數(shù)：start_AD7705
//功能：先寫offset寄存器，再寫full scale寄存器，然后啟動7705進行單次轉換
//參數(shù)：uint8_t channel -- 要進行A/D轉換的通道號
// uint8_t cali -- 是第幾次測量，電阻需要測量2次
//返回：無
//變量：無
//備注：
//------------------------------------------------------------------------------------------
void start_AD7705(void)
{
reset_AD7705();
//寫OFFSET寄存器
write_AD7705_byte( WR_OFFSET_REG );
write_AD7705_dword( ZS );
//寫滿量程校準寄存器
write_AD7705_byte( WR_FULL_REG );
write_AD7705_dword( GS );
//CLOCK寄存器設置，無分頻，50HZ輸出更新速率
write_AD7705_byte( WR_CLOCK_REG );
write_AD7705_byte( CLOCK_REG_SET );
//寫設置寄存器
write_AD7705_byte( WR_SETUP_REG );
write_AD7705_byte( text_of_setup[scale-1] );
start_timer0();
while( time_count < time_read_data );//讀取數(shù)據(jù)延時20ms左右,
stop_timer0();
}