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[问答]

AD7195数据寄存器读取为0是怎么回事？

目前是可以正确读取设备ID 也就是写入读取功能是没问题的。在主程序中AD7190_Data显示为0.
以下是主程序以及spi驱动
MAIN：
#include "main.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

#include "ad7190.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
uint32_t READ_Data = 0 ;
uint8_t READ_State = 0;

void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
uint32_t AD7190_Data = 0;
float AD7190_Val;

int main(void)
{

HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */
SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART3_UART_Init();
/* USER CODE BEGIN 2 */
v_AD7190_Statrt();
u_AD7190_Get_ID(0x84);//检查ID，，AD7195要该成0Xa6
read_reg();
/* USER CODE END 2 */

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
// GetDifferentialData();
/* write_buf = 0x60;
AD7192ReadWrite( write_buf,NULL,1);
write_buf = 0x00;
AD7192ReadWrite( write_buf, AD7190_ID,1);*/
// LED_TEST();
// v_AD7190_Get_Data();//读数据
while(AD7190_DOUT){};//
AD7190Write(0x58);
AD7190_Data = v_AD7190_Read3Byte();
v_AD7190_Cal(AD7190_Data, AD7190_Val);
// AD7190Write(0x5c);
// READ_Data = AD7190Read();
// READ_State = AD7190Read_Byte();
HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_0);
HAL_Delay(200);
[size=200%]AD7190.c:
[size=75%]
#include "ad7190.h"

uint8_t AD7190_ID;
uint8_t conf_reg[3];
uint8_t mode_reg[3];
uint32_t Data;



void Delay(uint32_t nCount)
{
for(; nCount != 0; nCount--);
}

void LED_TEST(void)//AD7190��ͨ��IO P2�����ӵ�LED������LED��˸
{
AD7190_CS_L;
AD7190Write(0x28);//
AD7190Write(0x24);//
AD7190_CS_H;
Delay(1000000);//Լ0.5S��ʱ
AD7190_CS_L;
AD7190Write(0x28);//
AD7190Write(0x20);//
AD7190_CS_H;
Delay(1000000);
}

void read_reg(void)//��ȡ���üĴ�����ģʽ�Ĵ���������������֤���������Ƿ���ȷд��
{
//��ȡ3Byte���üĴ�������
Delay(100);
AD7190_CS_L;
AD7190Write(0x50);//write communication register 0x50 to control the progress to read configuration register
AD7190_CS_H;
Delay(100);
AD7190_CS_L;
conf_reg[0]=AD7190Read_Byte();
conf_reg[1]=AD7190Read_Byte();
conf_reg[2]=AD7190Read_Byte();
AD7190_CS_H;
//��ȡ3Byteģʽ�Ĵ�������
Delay(100);
AD7190_CS_L;
AD7190Write(0x48);//write communication register 0x50 to control the progress to read configuration register
AD7190_CS_H;
Delay(100);
AD7190_CS_L;
mode_reg[0]=AD7190Read_Byte();
mode_reg[1]=AD7190Read_Byte();
mode_reg[2]=AD7190Read_Byte();
AD7190_CS_H;
}

void AD7190Write(uint8_t Data)
{
uint8_t data;
data=Data;
for(uint8_t i=0;i<8;i++)
{
AD7190_SCLK_L;
if(data 0x80)
AD7190_DIN_H;
else
AD7190_DIN_L;
Delay(100);
AD7190_SCLK_H;
Delay(100);
data<<=1;
}
}


uint32_t AD7190Read(void)
{
uint32_t DATA;
DATA=0;
for(uint8_t i=0;i<24;i++)
{
DATA<<=1;
AD7190_SCLK_L;
Delay(100);
if(AD7190_DOUT)
DATA++;
AD7190_SCLK_H;
Delay(100);
}
Delay(100);
return DATA;
}


uint8_t AD7190Read_Byte(void)
{
uint8_t DATA;
DATA=0;
for(uint8_t i=0;i<8;i++)
{
DATA<<=1;
AD7190_SCLK_L;
Delay(100);
if(AD7190_DOUT)
DATA++;
AD7190_SCLK_H;
Delay(100);
}
Delay(100);
return DATA;
}



void AD7190_Reset(void)
{
AD7190_CS_L;
AD7190_DIN_H;
for(uint8_t a=0;a<50;a++)//�ṩ����40��д��������λAD7190
{


AD7190_SCLK_L;
Delay(100);
AD7190_SCLK_H;
Delay(100);
}
AD7190_CS_H;
}

void AD7190_INIT(void)
{
Delay(100);
AD7190_CS_L;
AD7190Write(0x60);
AD7190_ID=AD7190Read_Byte();//��ȡAD7190 ID = 0xX4
AD7190_CS_H;
Delay(100);
AD7190_CS_L;
AD7190Write(0x10);//配置寄存器
AD7190Write(0x00);//CON23-CON16
AD7190Write(0x02);//CON15-CON8 通道选择
AD7190Write(0x00);//CON7-CON0 0x00:GAIN=1;增益设置
//0x03:GAIN=8;
//0x04:GAIN=16;
//0x07:GAIN=128; (GAIN=128ʱ�����뷶ΧΪ+-39.06mV)
AD7190_CS_H;
Delay(100);
AD7190_CS_L;
AD7190Write(0x08);//模式寄存器
AD7190Write(0x08);//MR23-MR16
AD7190Write(0x00);//MR15-MR8
AD7190Write(0x3f);//MR7-MR0 fs(MR0-MR9) = 0x00ff = 255,�������������Ϊ4920/255=19.2sps
//0x00 0xff��19.2sps
//0x00 0x3f��78sps
//0x00 0x1f��164sps
//0x00 0x0f��328sps
//0x00 0x05��984sps
AD7190_CS_H;
}

void v_AD7190_Statrt(void)
{
AD7190_Reset();//��λAD7190���ֽӿ�
AD7190_INIT();
Delay(100);
AD7190_CS_L;
AD7190Write(0x28);//GPOCONGPIO配置寄存器
AD7190Write(0x24);//P2为高，P3为低
AD7190_CS_H;
Delay(100);
AD7190_CS_L;
}

void v_AD7190_Get_Data(void)
{
while(AD7190_DOUT){};//
AD7190Write(0x58);
Data=AD7190Read();//Data
}

void u_AD7190_Get_ID(uint8_t id)
{
while(1)
{
Delay(100);
AD7190_CS_L;
AD7190Write(0x60);
AD7190_ID=AD7190Read_Byte();//��ȡAD7190 ID = 0xX4
AD7190_CS_H;
Delay(100);
if(AD7190_ID == id)
{
HAL_GPIO_WritePin(GPIOB, LD3_Pin, GPIO_PIN_SET);
break;
}
}
}

uint32_t v_AD7190_Read3Byte(void)
{
uint32_t Temp=0;
uint8_t Buf[3];
Buf[0] = AD7190Read_Byte();
Buf[1] = AD7190Read_Byte();
Buf[2] = AD7190Read_Byte();
return Temp = ((uint32_t)Buf[0]<<16) | ((uint32_t)Buf[1]<<8) | Buf[2];
}


void v_AD7190_Cal(uint32_t AD_Reg,float *Data)
{
*Data = ((float)AD_Reg/8388608 - 1)*AD7190_VREF/AD7190_GAIN;
}



回帖（1）

其实znvm

2024-3-4 16:37:04
从您提供的代码片段来看，AD7195数据寄存器读取为0可能有以下几个原因：

1. 硬件连接问题：请确保SPI接口的连接正确，并且AD7195的信号线与微控制器的信号线匹配。检查时钟、数据和片选线等是否正确连接。

2. 通信设置问题：请确保SPI通信的设置正确。AD7195的通信速度、数据位数、传输模式等设置需要与微控制器的SPI配置匹配。

3. AD7195配置问题：请确保您已正确配置AD7195的寄存器，特别是配置了正确的操作模式、增益和数据速率等参数。在读取数据之前，需要将AD7195配置为所需的操作模式。

4. SPI驱动问题：请确保您的SPI驱动程序正确配置和操作SPI外设。您可以通过调试SPI驱动程序来确保数据正确传输，并检查是否有任何错误或超时。

请逐步检查这些可能的问题，并确保每个步骤都正确。如果问题仍然存在，请提供更多细节或完整的代码，以便能够更好地帮助您解决问题。
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