2019 8 9 STM32F407ADS1526 continuous conversion configuration mode (sampling rate 15000SPS)

Did not try 30000sps

Sampling rate may not be used, you need to change the SPI rate, etc.

Use ADS1256DRDY pin as the interrupt trigger data collection

main.c中：

 1         if (state)
 2         {
 3             ADS1256WREG(ADS1256_MUX,(0 << 4) | ADS1256_MUXN_AINCOM);        //ÉèÖÃÍ¨µÀ
 4                 
 5             GPIO_ResetBits(GPIOB, GPIO_Pin_6);;
 6             while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY)); //µ±ADS1256_DRDYÎªµÍÊ±²ÅÄÜÐ´¼Ä´æÆ÷ 
 7         //    ADS1256WREG(ADS1256_MUX,channel);        //ÉèÖÃÍ¨µÀ
 8             SPI_WriteByte(ADS1256_CMD_SYNC);
 9         //    while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
10             SPI_WriteByte(ADS1256_CMD_WAKEUP);                   
11             while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
12             SPI_WriteByte(ADS1256_CMD_RDATAC);
13             while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
14             TIM_Cmd(TIM4, ENABLE);  //Ê¹ÄÜTIMxÍâÉè
15             delay_us(8);
16             state = 0;
17         }

External interruption:

u8 state=1;

long double getval[15010];
static u32 i;
//Íâ²¿ÖÐ¶Ï0·þÎñ³ÌÐò
void EXTI9_5_IRQHandler(void)
{
    long ulResult;
    long double ldVolutage;
    
    if(EXTI_GetITStatus(EXTI_Line8)!=RESET)     
    {

//        ADS1256WREG(ADS1256_MUX,(0 << 4) | ADS1256_MUXN_AINCOM);        //ÉèÖÃÍ¨µÀ
//            
//        GPIO_ResetBits(GPIOB, GPIO_Pin_6);;
//        while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY)); //µ±ADS1256_DRDYÎªµÍÊ±²ÅÄÜÐ´¼Ä´æÆ÷ 
//    //    ADS1256WREG(ADS1256_MUX,channel);        //ÉèÖÃÍ¨µÀ
//        SPI_WriteByte(ADS1256_CMD_SYNC);
//    //    while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
//        SPI_WriteByte(ADS1256_CMD_WAKEUP);                   
//        while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
//        SPI_WriteByte(ADS1256_CMD_RDATA);
//        while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
//        delay_us(8);
//    
        
        if(i<15000)
        {
            ulResult |= (SPI_WriteByte(0xff) << 16);
            ulResult |= (SPI_WriteByte(0xff) << 8);
            ulResult |= SPI_WriteByte(0xff);

            state = 1;

            if( ulResult & 0x800000 )
            {
                ulResult = ~(unsigned long)ulResult;
                ulResult &= 0x7fffff;
                ulResult += 1;
                ulResult = -ulResult;
            }

            getval[i++] = (long double)ulResult*5/8388607;        
//            i++;        
//            printf("i = %d\r\n",i);
//            printf("%lf",ldVolutage);     //double
//            printf("V\r\n");                
        }
        else 
        {        
//            for(int t = 0;t<i;t++)
//            {
//                printf("t = %d\r\n",t);
//                printf("%lf",getval[t]);     //double
//                printf("V\r\n");    
//            }
            i=0;
        }

    }         


    EXTI_ClearITPendingBit(EXTI_Line8); //Çå³ýLINE0ÉÏµÄÖÐ¶Ï±êÖ¾Î» 
}    

       
//Íâ²¿ÖÐ¶Ï³õÊ¼»¯³ÌÐò
//³õÊ¼»¯PE2~4,PA0ÎªÖÐ¶ÏÊäÈë.
void EXTIX_Init(void)
{
    NVIC_InitTypeDef   NVIC_InitStructure;
    EXTI_InitTypeDef   EXTI_InitStructure;
    
//    KEY_Init(); //°´¼ü¶ÔÓ¦µÄIO¿Ú³õÊ¼»¯
 
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//Ê¹ÄÜSYSCFGÊ±ÖÓ    
 
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource8);//PB8 Á¬½Óµ½ÖÐ¶ÏÏß8

    /* ÅäÖÃEXTI_Line2,3,4 */
    EXTI_InitStructure.EXTI_Line = EXTI_Line8;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//ÖÐ¶ÏÊÂ¼þ
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;//ÖÐ¶ÏÏßÊ¹ÄÜ
  EXTI_Init(&EXTI_InitStructure);//ÅäÖÃ
 
        
    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//Íâ²¿ÖÐ¶Ï0
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//ÇÀÕ¼ÓÅÏÈ¼¶0
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//×ÓÓÅÏÈ¼¶2
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//Ê¹ÄÜÍâ²¿ÖÐ¶ÏÍ¨µÀ
  NVIC_Init(&NVIC_InitStructure);//ÅäÖÃ
    
       
}

ADS1256 Configuration

void SPI1_Init(void)
{     
  GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;
    
//  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//Ê¹ÄÜGPIOBÊ±ÖÓ
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//Ê¹ÄÜSPI1Ê±ÖÓ
 
  //GPIOFB3,4,5³õÊ¼»¯ÉèÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;//PB3~5¸´ÓÃ¹¦ÄÜÊä³ö    
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´ÓÃ¹¦ÄÜ
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // 100MHz 
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // EIA 
  GPIO_Init (GPIOB, & GPIO_InitStructure); // ³õÊ¼ »¯ 
    
    GPIO_PinAFConfig (GPIOB, GPIO_PinSource3, GPIO_AF_SPI1); // PB3¸'ÓÃÎª SPI1 
    GPIO_PinAFConfig (GPIOB, GPIO_PinSource4, GPIO_AF_SPI1); // PB4¸'ÓÃÎª SPI1 
    GPIO_PinAFConfig (GPIOB, GPIO_PinSource5, GPIO_AF_SPI1); // PB5¸'ÓÃÎª SPI1 
 
    // ÕâÀïÖ 'Õë¶ÔSPI¿Ú³õÊ¼ »¯ 
    RCC_APB2PeriphResetCmd (RCC_APB2Periph_SPI1, ENABLE); // 'i 'SPI1 
    RCC_APB2PeriphResetCmd (RCC_APB2Periph_SPI1, DISABLE);// In Ö¹¸'Î £ »SPI1 

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  // ÉèÖÃSPIμ io ¥ »òÕßË« £ ÏòμÄÊý¾ÝÄ Ê½: SPIÉèÖÃÎªË «Issel« IOE «ê« ¹¤ 
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;        // ÉèÖÃSPI¹¤ × ÷ Ä £ Ê½: ÉèÖÃÎªÖ ÷ SPI 
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;        // ÉèÖÃSPIμÄÊý¾Ý'óÐ¡: SPI ËÍ½ÓÊÕ8Î · ¢ »Ö¡½á¹¹ 
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;        // '®ÐÐÍ¬²½Ê ± ÖÓμÄ¿ÕÏÐ ×'Ì¬ÎªμÍμçÆ½ 
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;    // '®ÐÐÍ¬²½Ê ÖÓμÄμÚ¶þ¸öÌø ± ± ano ¨ÉÏÉý £ »£ © òÏÂ½μ Êý¾Ý ±» ²ÉÑù 
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;        //NSSÐÅºÅÓÉÓ²¼þ ¨NSS¹Ü½Å £ £ © »¹ÊÇÈí¼þ ¨Ê¹ÓÃSSIÎ £» £ © ¹ÜÀí: ÄÚ²¿NSSÐÅºÅÓÐSSIÎ »¿ØÖÆ 
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;        // ¶¨Òå²¨ÌØÂÊÔ¤ · ÖÆμμÄÖμ: ²¨ÌØÂÊÔ¤ · ÖÆμÖμÎª256 
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;    // Ö¸¶¨Êý¾Ý' "Êä'ÓMSBÎ» »¹ÊÇLSBÎ» ¿ªÊ¼: Êý¾Ý' "Êä'ÓMSBÎ» ¿ªÊ¼ 
    SPI_InitStructure.SPI_CRCPolynomial = 7 ;    // CRCÖμ¼ÆËãμÄ¶àÏîÊ½ 
    SPI_Init (SPI1, & SPI_InitStructure);  // ¸ù¾ÝSPI_InitStructÖÐÖ¸¶¨μÄ²ÎÊý³õÊ¼ »÷ ¯ÍâÉèSPIx¼Ä'æÆ 
 
    SPI_Cmd (SPI1, ENABLE); // Ê¹ÄÜSPIÍâÉè 
} 

// ³õÊ¼ »¯ADS1256 GPIO 
void Init_ADS1256_GPIO (void)
{
  GPIO_InitTypeDef GPIO_InitStructure; 

    RCC -> AHB1ENR |= (1<<1);    //PB
    
     GPIO_InitStructure.GPIO_Pin = GPIO_RCC_ADS1256Reset|GPIO_Pin_6; 
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
     GPIO_Init(GPIO_RCC_ADS1256Reset_PORT, &GPIO_InitStructure);  
    
     GPIO_ResetBits(GPIO_RCC_ADS1256Reset_PORT, GPIO_RCC_ADS1256Reset );

    GPIO_InitStructure.GPIO_Pin = GPIO_ADS1256DRDY; 
  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN; 
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
  GPIO_Init (GPIO_ADS1256DRDY_PORT, & GPIO_InitStructure);  

    SPI1_Init (); 
} 


// ----------------------------------------------- ------------------ // 
//     ¹| Au £ º £ ÄâSPIÍ¨ÐÅ
 //     Èë¿Ú²ÎÊý: / · ¢ ËÍμÄSPIÊý¾Ý
 //     ³ö¿Ú²ÎÊý: / ½ÓÊÕμÄSPIÊý¾Ý
 //     You "¾Ö ± äÁ¿: /
 //     ± ¸ × ¢ · ¢ ËÍ½ÓÊÕº¯Êý
 // -------------------------- --------------------------------------- //
 unsigned char SPI_WriteByte (unsigned charTxData) 
{      
  while (SPI_I2S_GetFlagStatus (SPI1, SPI_I2S_FLAG_TXE) == RESET) {} // μÈ'ý · ¢ ËÍÇø¿Õ   
    
    SPI_I2S_SendData (SPI1, TxData); // Í¨¹ýÍâÉèSPIx EIO · ¢ »¸öbyte Êý¾Ý 
        
  while (SPI_I2S_GetFlagStatus (SPI1, SPI_I2S_FLAG_RXNE) == RESET) {} // μÈ'ý½ÓÊÕÍêÒ» ¸öbyte   
 
    return SPI_I2S_ReceiveData (SPI1); // · μ »ØÍ¨¹ýSPIx × î½ü½ÓÊÕμÄÊý¾Ý     
             
} 

// ------------------------------------- ---------------------------- // 
//     ¹| Au £ ºADS1256 Ð'Êý¾Ý
 //     Èë¿Ú²ÎÊý: /
 //     ³ö ¿Ú²ÎÊý: /
 //     You "¾Ö ± äÁ¿: /
//    ±¸    ×¢: ÏòADS1256ÖÐµØÖ·ÎªregaddrµÄ¼Ä´æÆ÷Ð´ÈëÒ»¸ö×Ö½Údatabyte
//-----------------------------------------------------------------//
void ADS1256WREG(unsigned char regaddr,unsigned char databyte)
{
    GPIO_ResetBits(GPIOB, GPIO_Pin_6);
    while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));//µ±ADS1256_DRDYÎªµÍÊ±²ÅÄÜÐ´¼Ä´æÆ÷
    //Ïò¼Ä´æÆ÷Ð´ÈëÊý¾ÝµØÖ·
    SPI_WriteByte(ADS1256_CMD_WREG | (regaddr & 0x0F));
    //Ð´ÈëÊý¾ÝµÄ¸öÊýn-1
    SPI_WriteByte(0x00);
    //ÏòregaddrµØÖ·Ö¸ÏòµÄ¼Ä´æÆ÷Ð´ÈëÊý¾Ýdatabyte
    SPI_WriteByte(databyte);
    delay_us(1);
    GPIO_SetBits(GPIOB, GPIO_Pin_6);
}


//³õÊ¼»¯ADS1256
void ADS1256_Init(void)
{
    Init_ADS1256_GPIO();
    GPIO_ResetBits(GPIOB, GPIO_Pin_7);  
    delay_us(50);
    GPIO_SetBits(GPIOB, GPIO_Pin_7);//RESET
    delay_us(50);    
    GPIO_ResetBits(GPIOB, GPIO_Pin_6);//CS
    ADS1256WREG(ADS1256_STATUS,0x06);  // ¸ßÎ»ÔÚÇ°¡¢Ð£×¼¡¢Ê¹ÓÃ»º³å
    while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
    SPI_WriteByte(ADS1256_CMD_SELFCAL);//Æ«ÒÆÔöÒæ×ÔÐ£×¼
//    ADS1256WREG(ADS1256_MUX,0x08);                  // ³õÊ¼»¯¶Ë¿ÚA0Îª¡®+¡¯£¬AINCOMÎ»¡®-¡¯
//    while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
    ADS1256WREG(ADS1256_ADCON,0);   // ·Å´ó±¶Êý1
    ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_15000SPS);  // Êý¾Ý5sps
    ADS1256WREG(ADS1256_IO,0x00); 
    GPIO_SetBits(GPIOB, GPIO_Pin_6);    
}

2019 8 9 STM32F407ADS1526 continuous conversion configuration mode (sampling rate 15000SPS)

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