ADS1256+SPI读取出来的数据是固定值，错在哪里呢-elvin的回答

ADS1256+SPI读取出来的数据是固定值，错在哪里呢

2019-07-20 21:44发布

[mw_shl_code=c,true]int main(void)
{

unsigned char i=0;
long ulResult;
long double ldVolutage;

u8 t;
u8 len;
u16 times=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÏµÍ³ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
delay_init(168); //ÑÓÊ±³õÊ¼»¯
uart_init(115200); //´®¿Ú³õÊ¼»¯²¨ÌØÂÊÎª115200
LED_Init();       //³õÊ¼»¯ÓëLEDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú

Init_ADS1256_GPIO(); //³õÊ¼»¯ADS1256 GPIO¹Ü½Å

GPIO_SetBits(GPIOB, GPIO_Pin_12 );

ADS1256_Init();
printf("ads³õÊ¼»¯ ");

while(1)
{

for(i = 0;i < 8;i++)
{
   ulResult = ADS_sum( (i << 4) | ADS1256_MUXN_AINCOM);
//ulResult = ADS_sum( ADS1256_MUXP_AIN0 | ADS1256_MUXN_AINCOM);
if( ulResult & 0x800000 )
{
     ulResult = ~(unsigned long)ulResult;
ulResult &= 0x7fffff;
ulResult += 1;
ulResult = -ulResult;
}

ldVolutage = (long double)ulResult*0.59604644775390625;

printf("µÚ%dÍ¨µÀ:",(i & 0x07)?(i & 0x07) - 1:7);
printf("%lf",ldVolutage); //double
printf("uV ");

//printf("%x",(unsigned long)ulResult);//16
delay_us(100);
}

}
}

void SPI2_Init(void)
{
SPI_InitTypeDef  SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/****Initial SPI2******************/

/* Enable SPI2 and GPIOB clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

/* Configure SPI2 pins: NSS, SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´ÓÃ¹¦ÄÜ
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀ
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2); //PB3¸´ÓÃÎª SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2); //PB4¸´ÓÃÎª SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2); //PB5¸´ÓÃÎª SPI1

//SPI2 NSS
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//¸´ÓÃ¹¦ÄÜ
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_SetBits(GPIOB, GPIO_Pin_12);

  /* SPI2 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI1ÉèÖÃÎªÁ½ÏßÈ«Ë«¹¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                   //ÉèÖÃSPI2ÎªÖ÷Ä£Ê½
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;                //SPI·¢ËÍ½ÓÊÕ8Î»Ö¡½á¹¹
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;                //´®ÐÐÊ±ÖÓÔÚ²»²Ù×÷Ê±£¬Ê±ÖÓÎªµÍµçÆ½
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;                //µÚÒ»¸öÊ±ÖÓÑØ¿ªÊ¼²ÉÑùÊý¾Ý
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                //NSSÐÅºÅÓÉÈí¼þ£¨Ê¹ÓÃSSIÎ»£©¹ÜÀí
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //¶¨Òå²¨ÌØÂÊÔ¤·ÖÆµµÄÖµ:²¨ÌØÂÊÔ¤·ÖÆµÖµÎª8
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;    //Êý¾Ý´«Êä´ÓMSBÎ»¿ªÊ¼
SPI_InitStructure.SPI_CRCPolynomial = 7;       //CRCÖµ¼ÆËãµÄ¶àÏîÊ½
SPI_Init(SPI2, &SPI_InitStructure);
/* Enable SPI2  */
SPI_Cmd(SPI2, ENABLE);
printf("SPI³õÊ¼»¯ ");
}

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

RCC_APB2PeriphClockCmd(RCC_ADS1256Reset | RCC_ADS1256DRDY, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_RCC_ADS1256Reset;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//¸´ÓÃ¹¦ÄÜ
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³
    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;//¸´ÓÃ¹¦ÄÜ
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIO_ADS1256DRDY_PORT, &GPIO_InitStructure);

SPI2_Init();
printf("GPIO³õÊ¼»¯ ");
}

//-----------------------------------------------------------------//
// ¹¦ ÄÜ£º  Ä£ÄâSPIÍ¨ÐÅ
// Èë¿Ú²ÎÊý: / ·¢ËÍµÄSPIÊý¾Ý
// ³ö¿Ú²ÎÊý: / ½ÓÊÕµÄSPIÊý¾Ý
// È«¾Ö±äÁ¿: /
// ±¸ ×¢: ·¢ËÍ½ÓÊÕº¯Êý
//-----------------------------------------------------------------//
unsigned char SPI_WriteByte(unsigned char TxData)
{
  unsigned char RxData=0;

  while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE)==RESET); //
  SPI_I2S_SendData(SPI2,TxData);

while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE)==RESET);

RxData=SPI_I2S_ReceiveData(SPI2);

return RxData;
printf("Ä£ÄâSPIÍ¨ÐÅ ");

}

//-----------------------------------------------------------------//
// 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_12);
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);
GPIO_SetBits(GPIOB, GPIO_Pin_12);
printf("ADS1256 Ð´Êý¾Ý ");
}

//³õÊ¼»¯ADS1256
void ADS1256_Init(void)
{
ADS1256WREG(ADS1256_STATUS,0x06);             // ¸ßÎ»ÔÚÇ°¡¢Ð£×¼¡¢Ê¹ÓÃ»º³å
// ADS1256WREG(ADS1256_MUX,0x08);                // ³õÊ¼»¯¶Ë¿ÚA0Îª¡®+¡¯£¬AINCOMÎ»¡®-¡¯
ADS1256WREG(ADS1256_ADCON,0x00);             // ·Å´ó±¶Êý1
ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_10SPS);  // Êý¾Ý5sps
ADS1256WREG(ADS1256_IO,0x00);
printf("³õÊ¼»¯ADS1256 ");
}

//¶ÁÈ¡ADÖµ
unsigned int ADS1256ReadData()
{
unsigned char i=0;
unsigned int sum=0;
unsigned int r=0;
GPIO_ResetBits(GPIOB, GPIO_Pin_12);;

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);
SPI_WriteByte(ADS1256_CMD_WAKEUP);
SPI_WriteByte(ADS1256_CMD_RDATA);

   sum |= (SPI_WriteByte(0xff) << 16);
sum |= (SPI_WriteByte(0xff) << 8);
sum |= SPI_WriteByte(0xff);

GPIO_SetBits(GPIOB, GPIO_Pin_12);
return sum;
printf("¶ÁÈ¡ADÖµ ");
}

//-----------------------------------------------------------------//
// ¹¦ ÄÜ£º¶ÁÈ¡ADS1256µ¥Â·Êý¾Ý
// Èë¿Ú²ÎÊý: /
// ³ö¿Ú²ÎÊý: /
// È«¾Ö±äÁ¿: /
// ±¸ ×¢: /
//-----------------------------------------------------------------//
unsigned int ADS_sum(unsigned char channel)
{
ADS1256WREG(ADS1256_MUX,channel); //ÉèÖÃÍ¨µÀ
return ADS1256ReadData();//¶ÁÈ¡ADÖµ£¬·µ»Ø24Î»Êý¾Ý¡£
printf("¶ÁÈ¡ADS1256µ¥Â·Êý¾Ý ");
}[/mw_shl_code]

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10条回答

elvin

2019-07-21 06:07

正点原子发表于 2016-5-20 20:41
示波器看看波形吧

原子哥说看哪里的波形呢

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ADS1256+SPI读取出来的数据是固定值，错在哪里呢

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