2019 8 9 STM32F407ADS1526连续转换模式相关配置（采样率达到15000SPS）

Posted 2022-07-28 calm-monkey

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没有试30000sps

采样率低可能还不能用，需要改变SPI速率等

使用ADS1256DRDY引脚作中断触发进行数据采集

main.c中（死循环前只执行一次）：

 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

外部中断：

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配置

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;//ÉÏÀ
  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);//¸´Î»SPI1
    RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);//Í£Ö¹¸´Î»SPI1

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //ÉèÖÃSPIµ¥Ïò»òÕßË«ÏòµÄÊý¾ÝÄ£Ê½:SPIÉèÖÃÎªË«ÏßË«ÏòÈ«Ë«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±äÑØ£¨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¦    ÄÜ£º  Ä£ÄâSPIÍ¨ÐÅ
//    Èë¿Ú²ÎÊý: /    ·¢ËÍµÄSPIÊý¾Ý
//    ³ö¿Ú²ÎÊý: /    ½ÓÊÕµÄSPIÊý¾Ý
//    È«¾Ö±äÁ¿: /
//    ±¸    ×¢:     ·¢ËÍ½ÓÊÕº¯Êý
//-----------------------------------------------------------------//
unsigned char SPI_WriteByte(unsigned char TxData)
     
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)//µÈ´ý·¢ËÍÇø¿Õ  
    
    SPI_I2S_SendData(SPI1, TxData); //Í¨¹ýÍâÉèSPIx·¢ËÍÒ»¸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¦    ÄÜ£ºADS1256 Ð´Êý¾Ý
//    Èë¿Ú²ÎÊý: /
//    ³ö¿Ú²ÎÊý: /
//    È«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);

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