STM32驱动外接ADC芯片ADS1120问题

#include "stm32f10x.h"

#define ADC_CS_LOW  GPIO_ResetBits(GPIOA,GPIO_Pin_4); 

#define ADC_CS_HIGN  GPIO_SetBits(GPIOA,GPIO_Pin_4); 

void UART2Init(void);

void UART2_PutChar(u8 ch);

void Delay_N_ms(unsigned int n);

void SPI_Configuration();

void ADC_RESET();

void SPI1_SendByte(u8 byte);

unsigned char SPI1_ReadByte(u8 byte);







unsigned char temp,ADC_HIGN_DATA,ADC_LOW_DATA;

u16 ADC_Data;



int main(void)

{

  SystemInit();

  UART2Init();

  SPI_Configuration();

  ADC_RESET();

    

  while (1)

  {



  }

}



void SPI_Configuration()

{

    GPIO_InitTypeDef GPIO_InitStructure; 

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE);

    //SPI_NSS 推挽输出

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA,&GPIO_InitStructure);

    //SPI_MISO 浮空输入

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA,&GPIO_InitStructure);

    //SPI_MOSI | SPI_SCK复用推挽输出

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA,&GPIO_InitStructure);

    //AD_READY信号

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB,&GPIO_InitStructure);

    

    

  

    SPI_InitTypeDef  SPI_InitStructure;

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1 , ENABLE);

    SPI_Cmd(SPI1, DISABLE); //先禁止才能改变Mode

    SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex; //双线双向全双工

    SPI_InitStructure.SPI_Mode =SPI_Mode_Master;//设置为主SPI

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;//8位数据帧格式

    SPI_InitStructure.SPI_CPOL =SPI_CPOL_Low;//SCK引脚在空闲状态保持低电平

    SPI_InitStructure.SPI_CPHA =SPI_CPHA_2Edge;//数据捕获于第二个时钟沿

    SPI_InitStructure.SPI_NSS =SPI_NSS_Soft;//软件控制NSS信号

    SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_8;//比特率预分频值为8

    SPI_InitStructure.SPI_FirstBit =SPI_FirstBit_MSB;//数据从高位开始发送

    SPI_InitStructure.SPI_CRCPolynomial =7;//定义用于计算CRC的多项式

    SPI_Init(SPI1,&SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);

    ADC_CS_HIGN;

}









void ADC_RESET()

{

    Delay_N_ms(1);//延时

    ADC_CS_LOW;//选中ADC芯片

    Delay_N_ms(1);//延时

    SPI1_SendByte(0x06);//复位ADC

    Delay_N_ms(1);//延时

    SPI1_SendByte(0x43);//0x43--01000011，写四个寄存器，从00-11开始写

    SPI1_SendByte(0x91);//00寄存器----AIN1为模拟输入管脚，无增益，PGA失能

    SPI1_SendByte(0xc0);//01寄存器----数据传输率1000SPS，单次转换模式

    SPI1_SendByte(0x00);//10寄存器----内部2.048V参考源

    SPI1_SendByte(0x00);//11寄存器----DRAY提示转换结束

    SPI1_SendByte(0x23);//读寄存器，查看是否正确

    Delay_N_ms(1);//延时

    UART2_PutChar(SPI1_ReadByte(0x00));//读取寄存器00

    UART2_PutChar(SPI1_ReadByte(0x00));//读取寄存器01

    UART2_PutChar(SPI1_ReadByte(0x00));//读取寄存器10

    UART2_PutChar(SPI1_ReadByte(0x00));//读取寄存器11

    SPI1_SendByte(0x08);//打开ADC转换使能，开始ADC转换

    Delay_N_ms(1);//延时

    ADC_CS_HIGN;

  

}





void SPI1_SendByte(u8 byte)

{

    while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE) == RESET);

    SPI_I2S_SendData(SPI1,byte);

    while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE) == RESET);

    SPI_I2S_ReceiveData(SPI1);

}





unsigned char SPI1_ReadByte(u8 byte)

{

    while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE) == RESET);

    SPI_I2S_SendData(SPI1,byte);

    while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE) == RESET);

    return SPI_I2S_ReceiveData(SPI1);

}