#include "stm32f4xx.h" #include "ADS1248.h"
#include "delay.h"
u8 results1,results2,results3;
u32 D;
char q;
void SPI_ADS1248_Init(void)
{
 SPI_InitTypeDef SPI_InitStruct; 
 GPIO_InitTypeDef GPIO_InitStructure;
 
 RCC_AHB1PeriphClockCmd(Open_SPIx_SCK_GPIO_CLK | Open_SPIx_MISO_GPIO_CLK | Open_SPIx_MOSI_GPIO_CLK,ENABLE);
 Open_SPIx_CLK_INIT(RCC_APB1Periph_SPI2,ENABLE);
 
 GPIO_PinAFConfig(Open_SPIx_SCK_GPIO_PORT, Open_SPIx_SCK_SOURCE,  Open_SPIx_MOSI_AF);
 GPIO_PinAFConfig(Open_SPIx_MISO_GPIO_PORT, Open_SPIx_MISO_SOURCE, Open_SPIx_MOSI_AF);
 GPIO_PinAFConfig(Open_SPIx_MOSI_GPIO_PORT, Open_SPIx_MOSI_SOURCE, Open_SPIx_MOSI_AF);
 
 GPIO_InitStructure.GPIO_Pin = Open_SPIx_SCK_PIN;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
 GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN; 
 GPIO_Init(Open_SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = Open_SPIx_MISO_PIN;
 GPIO_Init(Open_SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = Open_SPIx_MOSI_PIN;
 GPIO_Init(Open_SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);  SPI_I2S_DeInit(Open_SPIx);
 SPI_InitStruct.SPI_Direction= SPI_Direction_2Lines_FullDuplex;
 SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
 SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
 SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
 SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;
 SPI_InitStruct.SPI_NSS = SPI_NSS_Soft ;
 SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
 SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
 SPI_InitStruct.SPI_CRCPolynomial = 7;
 SPI_Init(Open_SPIx, &SPI_InitStruct);  SPI_Cmd(Open_SPIx, ENABLE); } /*******************************************************************************
* Function Name  : SPI_FLASH_SendByte
* Description    : Sends a byte through the SPI interface and return the byte
*                  received from the SPI bus.
* Input          : byte : byte to send.
* Output         : None
* Return         : The value of the received byte.
*******************************************************************************/
u8 SPI_ADS1248_SendByte(u8 byte)
{
  /* Loop while DR register in not emplty */
  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);   /* Send byte through the SPI1 peripheral */
  SPI_I2S_SendData(SPI2, byte);   /* Wait to receive a byte */
  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);   /* Return the byte read from the SPI bus */
  return SPI_I2S_ReceiveData(SPI2);
}
/*******************************************************************
函数名：初始化DAC接口
函数原型：void ADC_gpio_init()
参数说明：无
返回：  无
********************************************************************/
void ADS1248_GPIO_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA , ENABLE);
  GPIO_InitStructure.GPIO_Pin= ADS_RESET ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //--推免输出模式
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  //--GPIO翻转速度为50MHz    
  GPIO_Init(GPIOA , &GPIO_InitStructure); //--将配置写入对应的GPIO寄存器中
  RCC_AHBxPeriphClockCmd(RCC_GPIO_CS,ENABLE);     GPIO_InitStructure.GPIO_Pin = GPIO_PIN_CS;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIO_CS_PORT, &GPIO_InitStructure); 
}  //-----------------------------------------------------------------//
// 功    能：ADS1248 写数据
// 入口参数: /
// 出口参数: /
// 全局变量: /
// 备    注: 向ADS1248中地址为regaddr的寄存器写入一个字节databyte
//-----------------------------------------------------------------// void ADS1248WREG(unsigned char regaddr,unsigned char databyte)
{
 
    SPI_ADS1248_SendByte(ADS1248_CMD_WREG+(regaddr & 0xF));     SPI_ADS1248_SendByte(0);     SPI_ADS1248_SendByte(databyte);
}
//-----------------------------------------------------------------//
// 功    能：ADS1248 读数据
// 入口参数: /
// 出口参数: /
// 全局变量: /
// 备    注: 从ADS1248中地址为regaddr的寄存器读出一个字节databyte
//-----------------------------------------------------------------// unsigned char ADS1248RREG(unsigned char regaddr)
{     unsigned char r=0;     SPI_ADS1248_SendByte(ADS1248_CMD_RREG+(regaddr & 0xF));     SPI_ADS1248_SendByte(0);     r=SPI_ADS1248_SendByte(ADS1248_CMD_NOP);     return r;
}
//-----------------------------------------------------------------//
// 功    能：ADS1248初始化子程序
// 入口参数: /
// 出口参数: /
// 全局变量: /
// 备    注: /
//-----------------------------------------------------------------//
void InitADS1248(void)
{      START_0;//发送复位命令
    RESET_0;
    delay_ms(10);
    RESET_1;
 delay_ms(20);
 
    ADS1248WREG(ADS1248_REG_MUX0,0x01);   delay_ms(20);
    ADS1248WREG(ADS1248_REG_MUX1,0x30);     delay_ms(20);     ADS1248WREG(ADS1248_REG_VBIAS,0);   delay_ms(20);
    ADS1248WREG(ADS1248_REG_IDAC1,0xFF);
  delay_ms(20);
 
    ADS1248WREG(ADS1248_REG_IDAC0,0x00); 
 
  delay_ms(20);
  q=ADS1248RREG(ADS1248_REG_MUX1);
 printf("4d%x",q);
    ADS1248WREG(ADS1248_REG_SYS0,0x01);
  delay_ms(20);
  
} void Ads1248(void)
{  
 D=0;     SPI_ADS1248_SendByte(ADS1248_CMD_RDATAC);
  
    results1=SPI_ADS1248_SendByte(0xFF);
  results2=SPI_ADS1248_SendByte(0xFF);
  results3=SPI_ADS1248_SendByte(0xFF);
  D|=results1<<16|results2<<8|results3;
    SPI_ADS1248_SendByte(ADS1248_CMD_NOP);
        
}
void START_test(void)
{
  START_1;
   delay_us(800);
//  delay_ms(7);
  START_0; } void NVIC_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;          
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_Init(GPIOE,&GPIO_InitStructure);   SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource4);
     EXTI_InitStructure.EXTI_Line = EXTI_Line4; //--外部中断线,使用第1根
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;      //--中断模式
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  //--上升沿触发模式
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;                //--打开中断
     EXTI_Init(&EXTI_InitStructure);      //--写入对应寄存器中  // 使能外部中断，并配置优先级// EXTI_Trigger_Falling   EXTI_Trigger_Rising
  NVIC_InitStructure.NVIC_IRQChannel =EXTI4_IRQn;   //--第1个引脚,所以使用1通道
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//--设置中断优先级为1
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  //--设置子优先级为1
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  //--启用通道
  NVIC_Init(&NVIC_InitStructure); }
#ifndef _ADS1248_H
#define _ADS1248_H #include <stdio.h>
#include "stm32f4xx.h" /**
 * @brief Definition for connected to I2C1
 */
/* SPIx Communication boards Interface */
// SPI1 MISO (PA6) MOSI(PA7)  CLK(PA5)  NSS(PA4) #define Open_SPIx                           SPI2
#define Open_SPIx_CLK                       RCC_APB1Periph_SPI2
#define Open_SPIx_CLK_INIT                  RCC_APB1PeriphClockCmd
#define Open_SPIx_IRQn                      SPI2_IRQn
#define Open_SPIx_IRQHANDLER                SPI2_IRQHandler #define Open_SPIx_SCK_PIN                   GPIO_Pin_13
#define Open_SPIx_SCK_GPIO_PORT             GPIOB
#define Open_SPIx_SCK_GPIO_CLK              RCC_AHB1Periph_GPIOB
#define Open_SPIx_SCK_SOURCE                GPIO_PinSource13
#define Open_SPIx_SCK_AF                    GPIO_AF_SPI2 #define Open_SPIx_MISO_PIN                  GPIO_Pin_14
#define Open_SPIx_MISO_GPIO_PORT            GPIOB
#define Open_SPIx_MISO_GPIO_CLK             RCC_AHB1Periph_GPIOB
#define Open_SPIx_MISO_SOURCE               GPIO_PinSource14
#define Open_SPIx_MISO_AF                   GPIO_AF_SPI2 #define Open_SPIx_MOSI_PIN                  GPIO_Pin_15
#define Open_SPIx_MOSI_GPIO_PORT            GPIOB
#define Open_SPIx_MOSI_GPIO_CLK             RCC_AHB1Periph_GPIOB
#define Open_SPIx_MOSI_SOURCE               GPIO_PinSource15
#define Open_SPIx_MOSI_AF                   GPIO_AF_SPI2 /******************ads1248引脚设置*******************/
//#define  RCC_APB2Periph_ADS_PORT    RCC_APB2Periph_GPIOC
//#define  ADS_PORT                 GPIOC
#define  ADS_RESET     GPIO_Pin_1
#define  ADS_START     GPIO_Pin_2
//#define  ADS_DRDY     GPIO_Pin_3
#define ADS_DRDY GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_4)
#define RESET_1     GPIO_SetBits(GPIOA, ADS_RESET)    
#define RESET_0     GPIO_ResetBits(GPIOA, ADS_RESET) #define START_1     GPIO_SetBits(GPIOA, ADS_START)
#define START_0     GPIO_ResetBits(GPIOA, ADS_START) //#define SPI_ADS1248_CS_PIN                        GPIO_Pin_4                  /* PC.05 */
#define RCC_GPIO_CS     RCC_AHB1Periph_GPIOB
#define RCC_AHBxPeriphClockCmd  RCC_AHB1PeriphClockCmd
#define GPIO_PIN_CS     GPIO_Pin_12
#define GPIO_CS_PORT    GPIOB #define SPI_ADS1248_Enable    GPIO_ResetBits(GPIO_CS_PORT,GPIO_PIN_CS);
#define SPI_ADS1248_Disable    GPIO_SetBits(GPIO_CS_PORT,GPIO_PIN_CS);
//#define SPI_ADS1248_CS_LOW()       GPIO_ResetBits(GPIOA, GPIO_Pin_4)
//#define SPI_ADS1248_CS_HIGH()      GPIO_SetBits(GPIOA, GPIO_Pin_4)
/******************ads1248寄存器地址*******************/
#define   ADS1248_CMD_WAKEUP    0x00
#define   ADS1248_CMD_SLEEP     0x02
#define   ADS1248_CMD_SYNC      0x04
#define   ADS1248_CMD_RESET     0x06
#define   ADS1248_CMD_NOP       0xff
#define   ADS1248_CMD_RDATA     0x12
#define   ADS1248_CMD_RDATAC    0x14
#define   ADS1248_CMD_SDATAC    0x16
#define   ADS1248_CMD_RREG      0x20
#define   ADS1248_CMD_WREG      0x40 #define   ADS1248_REG_MUX0    0x00
#define   ADS1248_REG_VBIAS   0x01
#define   ADS1248_REG_MUX1    0x02
#define   ADS1248_REG_SYS0    0x03
#define   ADS1248_REG_CFC0    0x04
#define   ADS1248_REG_CFC1    0x05
#define   ADS1248_REG_CFC2    0x06
#define   ADS1248_REG_FSC0    0x07
#define   ADS1248_REG_FSC1    0x08
#define   ADS1248_REG_FSC2    0x09
#define   ADS1248_REG_IDAC0   0x0a
#define   ADS1248_REG_IDAC1   0x0b
#define   ADS1248_REG_GPIOCFG  0x0c
#define   ADS1248_REG_GPIODIR  0x0d
#define   ADS1248_REG_GPIODAT  0x0e
/******************ads1248测量通道选择*******************/
 
#define   Ads_1    0x07
#define   Ads_2    0x0f
#define   Ads_3    0x17
#define   Ads_4    0x1f
#define   Ads_5    0x27
#define   Ads_6    0x2f
#define   Ads_7    0x37
extern u8  results1;
extern u8  results2;
extern u8  results3;
extern u32 D;
extern  char q;
void ADS1248_GPIO_init(void);
void ADS1248WREG(unsigned char regaddr,unsigned char databyte);
void InitADS1248(void);
void Ads1248(void);
void START_test(void);
void SPI_ADS1248_Init(void);
u8 SPI_ADS1248_SendByte(u8 byte);
u8 SPI_ADS1248_Receivebyte(void);


求助大家，小弟实在没搞定，4d30 0.00000  每次的读数都是这个  没电压，4d是我在指令后面写的可以准确读出是30，但是数据始终读不出来，查了很多资料说在时序上可能存在问题，但是真的是不知道怎么修改，请大家帮忙，究竟是哪里有问题。