stm32下，ad7171芯片调试笔记

ID:826132 · 发表于 2020-10-6 12:11

最近在做一个项目，是使用AD芯片，采集一个电压信号，使用了AD77171A芯片
程序从别的地方找了，参照改了下，代码如下

/********************************************************************************
Author : Akshay Kumar B U (akshay.kumar@analog.com)
India Applications Support Team
Date : December 2013
File name : AD7171.c
Description : This is an executable file containing all definitions of functions used for operating AD7171 in SPI mode.
Hardware Platform : ADuCM360 + AD7171
********************************************************************************/
/* ADuCM360 interface with AD7171
SCLK - P1.1
PDRST - P1.2
DOUT/RDY - P1.3
*/
//引脚说明 ; AD7171_SCLK = PBout(12), Read Data= Pb.6
#include "ad7171.h"
#include "led.h"
#include "delay.h"
// UART-based external variables
u8 ucTxBufferEmpty = 0; // Used to indicate that the UART Tx buffer is empty
u8 szTemp[64] = ""; // Used to store string before printing to UART
u8 nLen = 0;
u8 AD_i = 0;
u8 ucWaitForUart = 0; // Used by calibration routines to wait for user input
//Initializing AD7171 to default settings
void InitializeAD7171(void)
{
AD7171_SCLK =0;
delay_us(1); // 100ns delay
delay_ms(1); //1ms delay
}
void SpiFunction(u16 *InputBuf, u16 *OutputBuf, u16 NoOfBytes)
{
int i,j;
u16 TempInput = 0x00;
//unsigned int TempOutput = 0x00;
u16 ReceivedBit = 0x00;
for(i=0; i< NoOfBytes; i++)
{
//TempOutput = *OutputBuf;
for(j=0; j<8; j++)
{
////////////WRITE DATA/////////////
TempInput<<=1;
AD7171_SCLK =0;//ADuCM360GpioOutput(AD7171_SCLK, PIN_LOW);
delay_us(1);//Delay(100);
AD7171_SCLK =1;
delay_us(1);//Delay(100);
//if(0x80==(TempOutput & 0x80))
// {
// ADuCM360GpioOutput(AD7171_SDIN, PIN_HIGH);
// }
// else
// {
// ADuCM360GpioOutput(AD7171_SDIN, PIN_LOW);
// }
// TempOutput<<=1;
// Delay(1);
////////////WRITE DATA ENDS/////////
///////////READ DATA///////
ReceivedBit = PBin(6);//ADuCM360GpioInput(AD7171_DOUTRDY);
if(0x1==ReceivedBit)
{
TempInput |= 1;
}
////////////READ DATA ENDS/////////
}
*InputBuf = TempInput;
OutputBuf++;
InputBuf++;
}
AD7171_SCLK =1;//ADuCM360GpioOutput(AD7171_SCLK, PIN_HIGH);
delay_us(1);//Delay(100);
}
void SpiFunction2(u16 *InputBuf, u16 *OutputBuf, u16 NoOfBytes)
{
int i,j;
u16 TempInput = 0x00;
//unsigned int TempOutput = 0x00;
u16 ReceivedBit = 0x00;
for(i=0; i< NoOfBytes; i++)
{
//TempOutput = *OutputBuf;
for(j=0; j<8; j++)
{
TempInput<<=1;
AD7171_SCLK =0;//ADuCM360GpioOutput(AD7171_SCLK, PIN_LOW);
delay_us(1);//Delay(100);
ReceivedBit = PBin(6);//ADuCM360GpioInput(AD7171_DOUTRDY);
if(0x1==ReceivedBit)
{
TempInput |= 1;
}
AD7171_SCLK =1;
delay_us(1);//Delay(100);
}
/*
for (i = 0; i < 16; i++)
{
SCLK = 0;
usData = usData << 1;
usData |= DAT;
SCLK = 1;
}
*/
*InputBuf = TempInput;
OutputBuf++;
InputBuf++;
}
AD7171_SCLK =1;//ADuCM360GpioOutput(AD7171_SCLK, PIN_HIGH);
delay_us(1);//Delay(100);
}
//Function to Read data from AD7171
u16 ReadFromAD7171(void)
{
u16 ready = 0x000001;
u16 DataReg = 0x000000;
u16 InputRegister[10];
u16 OutputRegister[10];
u16 StatusBar = 0x00;
int i=0;
AD7171_SCLK =1; //ADuCM360GpioOutput (AD7171_SCLK, PIN_HIGH);
while(ready) // Waits untill the DOUT/RDY pin goes low to indicate
{ // data is converted and is ready to be read.
ready = PBin(6);//ADuCM360GpioInput (AD7171_DOUTRDY);
}
delay_ms(1);//Delay(1000);
SpiFunction2(InputRegister, OutputRegister, NoOfByte); //SPI read write
for(i=0; i<2; i++)
{
DataReg <<= 8;
DataReg |= InputRegister[i];
}
StatusBar = (InputRegister[2] & 0x0000FF);
// ErrorCheck(InputRegister[2]); // Performs Error Check in AD7171 Received Data. 'ErrorBit' is set to 1 if any error is present.
delay_us(1);
do
{
ready = PBin(6);//ADuCM360GpioInput (AD7171_DOUTRDY);
} while(ready != 0x01);
return DataReg;
}
/*
// Performs Error Check in the received data
void ErrorCheck(unsigned int Status)
{
if(0x20 ==(Status & 0x20))
{
InitializeAD7171(); //Initializes the AD7171 device when the Error bit is set
//or when the pattern bits PAT2,PAT1 and PAT0 are not equal to 101
//or when ID bits ID1 and ID0 are not equal to 01.
// sprintf ( (char*)szTemp, "Error Present as Error Bit in Status Register is set high \r\n");
// nLen = strlen((char*)szTemp);
if (nLen <64)
SendString();
}
if (0x05 != (Status & 0x05))
{
InitializeAD7171();
// sprintf ( (char*)szTemp, "Error due to mismatch in Pattern Bits \r\n");
// nLen = strlen((char*)szTemp);
if (nLen <64)
SendString();
}
if (0x08 != (Status & 0x08))
{
InitializeAD7171();
// sprintf ( (char*)szTemp, "Error due to mismatch in ID bits of Status Bar \r\n");
// nLen = strlen((char*)szTemp);
if (nLen <64)
SendString();
}
else if (0x0D ==(Status & 0x0D))
{
// sprintf ( (char*)szTemp, "No Error \r\n");
// nLen = strlen((char*)szTemp);
if (nLen <64)
SendString();
}
}
*/

复制代码

但是发现读到的数值，算出的结果，比实际的值要小些，还没找到问题

ID:826132 · 发表于 2020-10-6 12:13

首次发贴，自己顶下。

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stm32下 ，ad7171芯片调试笔记

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stm32下，ad7171芯片调试笔记