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这是最近烟尘一个项目需要使用4路0-20ma电流输出,一开始使用的是XTR115来做,源是PWM波,但是后来发现XTR115供电是个问题,最重要的是精度无法保证,而且电流输出控制比较复杂,不是简单输入输出的。
这里贴出原理图以及AD5410的接口源码。
一开始调试时发现老调不通,仔细看代码,发现自己手贱,很多写法类似的程序我都是复制过来再修改,没有详细检查,到头来,调试时才反过来查看。
#include "msp430f5324.h"
#include "AP_main.h"
#include "Timer1_A1.h"
#include "intrinsics.h"
#include "rtc.h"
#include <string.h>
#include "crc16.h"
#include "rain.h"
#include "flash.h"
#include "AD.h"
#include "AD5410.h"
void AD5410_Init(void)
{
CONFIG_AD5410_PORT;
}
unsigned char AD5410_Write_Bytes(unsigned char *ptr,unsigned char chipNum)
{
unsigned char mDat[18];
unsigned char mchipNum=0;
memcpy(mDat,ptr,chipNum*3);
AD5410_LATCH_L;
AD5410_SCLK_L;
while(mchipNum<chipNum)
{
for(int mPos=0;mPos<3;mPos++)
for(int mNum=0;mNum<8;mNum++)
{
AD5410_SCLK_L;
if((mDat[3*mchipNum+2-mPos]&0x80)==0x80)
AD5410_SDI_H;
else
AD5410_SDI_L;
AD5410_SCLK_H;
AD5410_SCLK_L;
mDat[3*mchipNum+2-mPos]<<=1;
}
mchipNum++;
}
AD5410_LATCH_L;
AD5410_LATCH_H;
AD5410_LATCH_L;
return 1;
}
unsigned char AD5410_Reset(unsigned char chipNum)
{
unsigned char mDat[18];
//unsigned char mchipNum=0;
mDat[0]=0x01;mDat[1]=0x00;mDat[2]=AD5410_RST_REG;
for(int i=0;i<5;i++)
memcpy(mDat+3+i*3,mDat+i*3,3);
AD5410_Write_Bytes(mDat,chipNum);
return 1;
}
unsigned char AD5410_Write_ControlREG(unsigned char chipNum)
{
unsigned char mDat[18];
mDat[0]=AD5410_DCEN+AD5410_R;mDat[1]=AD5410_OUTEN;mDat[2]=AD5410_CTR_REG;
for(int i=0;i<5;i++)
memcpy(mDat+3+i*3,mDat+i*3,3);
AD5410_Write_Bytes(mDat,chipNum);
return 1;
}
unsigned char AD5410_Write_DataREG(unsigned int *dat,unsigned char chipNum)
{
unsigned char mDat[18];
for(int i=0;i<chipNum;i++)
{
mDat[0+i*3]=(unsigned char)(dat<<4);
mDat[1+i*3]=(unsigned char)(dat>>4);
mDat[2+i*3]=AD5410_DATA_REG;
}
AD5410_Write_Bytes(mDat,chipNum);
return 1;
}
unsigned char AD5410_Current_Output(float *currentArray,unsigned char chipNum)
{
unsigned int currentDat[6];
for(int i=0;i<chipNum;i++)
{
currentArray[chipNum]=(currentArray[chipNum]-4)*4096/16;
unsigned int mC=(unsigned int)currentArray[chipNum]*10;
if((mC%10)>=5)
currentArray[chipNum]=currentArray[chipNum]+1;
currentDat[chipNum]=(unsigned int)currentArray[chipNum];
}
AD5410_Write_DataREG(currentDat,chipNum);
return 1;
}
头文件:
#ifndef _AD5410_H
#define _AD5410_H
#define AD5410_Port_OUT P4OUT
#define AD5410_Port_DIR P4DIR
#define AD5410_LATCH_BIT BIT0
#define AD5410_SDI_BIT BIT1
#define AD5410_SCLK_BIT BIT3
#define AD5410_LATCH_H AD5410_Port_OUT|=AD5410_LATCH_BIT
#define AD5410_LATCH_L AD5410_Port_OUT&=~AD5410_LATCH_BIT
#define AD5410_SDI_H AD5410_Port_OUT|=AD5410_SDI_BIT
#define AD5410_SDI_L AD5410_Port_OUT&=~AD5410_SDI_BIT
#define AD5410_SCLK_H AD5410_Port_OUT|=AD5410_SCLK_BIT
#define AD5410_SCLK_L AD5410_Port_OUT&=~AD5410_SCLK_BIT
#define CONFIG_AD5410_PORT {AD5410_Port_DIR|=(AD5410_LATCH_BIT+AD5410_SDI_BIT+AD5410_SCLK_BIT);AD5410_LATCH_L;AD5410_SCLK_L;AD5410_SDI_H;}
#define AD5410_COMMAND_NOP 0
#define AD5410_DATA_REG 1
#define AD5410_RECALL 2
#define AD5410_CTR_REG 0x55
#define AD5410_RST_REG 0x56
#define AD5410_READ_STA_REG 0
#define AD5410_READ_DAT_REG 1
#define AD5410_READ_CTR_REG 2
#define AD5410_REXT 0x20
#define AD5410_OUTEN 0x10
#define AD5410_SR_CLOCK 0x01
#define AD5410_SR_STEP 0xC0
#define AD5410_SREN 0x10
#define AD5410_DCEN 0x08
#define AD5410_R 0x05
void AD5410_Init(void);
unsigned char AD5410_Write_Bytes(unsigned char *ptr,unsigned char chipNum);
unsigned char AD5410_Reset(unsigned char chipNum);
unsigned char AD5410_Write_ControlREG(unsigned char chipNum);
unsigned char AD5410_Write_DataREG(unsigned int *dat,unsigned char chipNum);
unsigned char AD5410_Current_Output(float *currentArray,unsigned char chipNum);
#endif
简单测试:
AD5410_Init();
AD5410_Reset(4);
NWK_DELAY(100);
AD5410_Write_ControlREG(1);
AD5410_Write_ControlREG(2);
AD5410_Write_ControlREG(3);
AD5410_Write_ControlREG(4);
NWK_DELAY(200);
unsigned int mdat[4]={1024,2048,3072,4095};
AD5410_Write_DataREG(mdat,4);
输出8ma,12ma,16ma,20ma |
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