一：

最近实验室有几个项目都需要用到高分辨率AD转换，于是就开始了ADS1256的开发。

新手，焊得丑，见谅（能用就行）

二：

本以为很容易就能做完，结果被采样速率的问题困扰了很久。

代码如下，使用2.5V基准源进行测试，结果在读ADS时经常出现读出0xFFFFFF的情况，只能忍住悲伤开始查找资料，后来在TI论坛上看到一位大哥说这种情况一般是SPI没有读取到数据于是直接将ADS初始化中的10SPS改成30000SPS，结果一测试OK了。

void ADS1256_Init(void)
{   ADS1256WREG(ADS1256_STATUS,0x04);    ADS1256WREG(ADS1256_MUX,0x01);ADS1256WREG(ADS1256_ADCON,0x00);              ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_10SPS);  ADS1256WREG(ADS1256_IO,0x00);
}

三：

可能因为ADS1256是外部ADC，数据转换速率慢于单片机时就会造成SPI上没有数据导致单片机读取不到吧，模数转换很多东西的确比较复杂，以前只注重简单的应用，还是需要以后继续学习，也请各位大哥多多指正。

最后附上代码：

ADS1256.c

#include "ADS1256.h"#define  FILTER_NUM 10unsigned int ads_value;
unsigned int ads_flitter[FILTER_NUM+1];
long double ads_voltage;void SPI1_Init(void)
{SPI_InitTypeDef  SPI_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;/****Initial SPI1******************//* Enable SPI1 and GPIOA clocks */RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_Init(GPIOA, &GPIO_InitStructure);//SPI1 NSS GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_SetBits(GPIOA, GPIO_Pin_4);/* SPI1 configuration */ SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                   SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;                SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;                 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;               SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;      SPI_InitStructure.SPI_CRCPolynomial = 7;         SPI_Init(SPI1, &SPI_InitStructure);/* Enable SPI1  */SPI_Cmd(SPI1, ENABLE);
}  void Init_ADS1256_GPIO(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);   SPI1_Init();
}unsigned char SPI_WriteByte(unsigned char TxData)
{unsigned char RxData=0;while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);                                                SPI_I2S_SendData(SPI1,TxData);while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);RxData=SPI_I2S_ReceiveData(SPI1);return RxData;
} void ADS1256WREG(unsigned char regaddr,unsigned char databyte)
{GPIO_ResetBits(GPIOA, GPIO_Pin_4);while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));SPI_WriteByte(ADS1256_CMD_WREG | (regaddr & 0x0F));SPI_WriteByte(0x00);SPI_WriteByte(databyte);GPIO_SetBits(GPIOA, GPIO_Pin_4);
}void ADS1256_Init(void)
{   ADS1256WREG(ADS1256_STATUS,0x04);    ADS1256WREG(ADS1256_MUX,0x01);ADS1256WREG(ADS1256_ADCON,0x00);                ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_30000SPS); ADS1256WREG(ADS1256_IO,0x00);
}unsigned int ADS1256ReadData(unsigned char channel)
{unsigned int data;ADS1256WREG(ADS1256_MUX, channel | ADS1256_MUXN_AIN1);GPIO_ResetBits(GPIOA, GPIO_Pin_4);while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));SPI_WriteByte(ADS1256_CMD_SYNC);SPI_WriteByte(ADS1256_CMD_WAKEUP);        SPI_WriteByte(ADS1256_CMD_RDATA);data |= (SPI_WriteByte(0xff)<<16);data |= (SPI_WriteByte(0xff)<<8);data |= SPI_WriteByte(0xff);return data;
}unsigned int ADS_Flitter()
{unsigned char i=0;ads_flitter[FILTER_NUM+1] = 0;for(i=0;i<FILTER_NUM;i++){ads_flitter[i] = ADS1256ReadData(0);ads_flitter[FILTER_NUM+1] += ads_flitter[i];}ads_flitter[FILTER_NUM+1] = ads_flitter[FILTER_NUM+1]/FILTER_NUM;ads_value = ads_flitter[FILTER_NUM+1];return ads_value;
}long double ADS_Voltage()
{ads_voltage = (long double)ADS_Flitter()*5/0x7FFFFF;return ads_voltage;
}

ADS1256.h

#ifndef __ADS1256_H_
#define __ADS1256_H_
#include "stm32f10x.h"#define RCC_ADS1256DRDY                             RCC_APB2Periph_GPIOA
#define GPIO_ADS1256DRDY_PORT                       GPIOA
#define GPIO_ADS1256DRDY                            GPIO_Pin_0// define commands
#define ADS1256_CMD_WAKEUP   0x00
#define ADS1256_CMD_RDATA    0x01
#define ADS1256_CMD_RDATAC   0x03
#define ADS1256_CMD_SDATAC   0x0f
#define ADS1256_CMD_RREG     0x10
#define ADS1256_CMD_WREG     0x50
#define ADS1256_CMD_SELFCAL  0xf0
#define ADS1256_CMD_SELFOCAL 0xf1
#define ADS1256_CMD_SELFGCAL 0xf2
#define ADS1256_CMD_SYSOCAL  0xf3
#define ADS1256_CMD_SYSGCAL  0xf4
#define ADS1256_CMD_SYNC     0xfc
#define ADS1256_CMD_STANDBY  0xfd
#define ADS1256_CMD_REST    0xfe // define the ADS1256 register values
#define ADS1256_STATUS       0x00
#define ADS1256_MUX          0x01
#define ADS1256_ADCON        0x02
#define ADS1256_DRATE        0x03
#define ADS1256_IO           0x04
#define ADS1256_OFC0         0x05
#define ADS1256_OFC1         0x06
#define ADS1256_OFC2         0x07
#define ADS1256_FSC0         0x08
#define ADS1256_FSC1         0x09
#define ADS1256_FSC2         0x0A // define multiplexer codes
#define ADS1256_MUXP_AIN0   0x00
#define ADS1256_MUXP_AIN1   0x10
#define ADS1256_MUXP_AIN2   0x20
#define ADS1256_MUXP_AIN3   0x30
#define ADS1256_MUXP_AIN4   0x40
#define ADS1256_MUXP_AIN5   0x50
#define ADS1256_MUXP_AIN6   0x60
#define ADS1256_MUXP_AIN7   0x70
#define ADS1256_MUXP_AINCOM 0x80 #define ADS1256_MUXN_AIN0   0x00
#define ADS1256_MUXN_AIN1   0x01
#define ADS1256_MUXN_AIN2   0x02
#define ADS1256_MUXN_AIN3   0x03
#define ADS1256_MUXN_AIN4   0x04
#define ADS1256_MUXN_AIN5   0x05
#define ADS1256_MUXN_AIN6   0x06
#define ADS1256_MUXN_AIN7   0x07
#define ADS1256_MUXN_AINCOM 0x08   // define gain codes
#define ADS1256_GAIN_1      0x00
#define ADS1256_GAIN_2      0x01
#define ADS1256_GAIN_4      0x02
#define ADS1256_GAIN_8      0x03
#define ADS1256_GAIN_16     0x04
#define ADS1256_GAIN_32     0x05
#define ADS1256_GAIN_64     0x06
//#define ADS1256_GAIN_64     0x07 //define drate codes
#define ADS1256_DRATE_30000SPS   0xF0
#define ADS1256_DRATE_15000SPS   0xE0
#define ADS1256_DRATE_7500SPS   0xD0
#define ADS1256_DRATE_3750SPS   0xC0
#define ADS1256_DRATE_2000SPS   0xB0
#define ADS1256_DRATE_1000SPS   0xA1
#define ADS1256_DRATE_500SPS    0x92
#define ADS1256_DRATE_100SPS    0x82
#define ADS1256_DRATE_60SPS     0x72
#define ADS1256_DRATE_50SPS     0x63
#define ADS1256_DRATE_30SPS     0x53
#define ADS1256_DRATE_25SPS     0x43
#define ADS1256_DRATE_15SPS     0x33
#define ADS1256_DRATE_10SPS     0x23
#define ADS1256_DRATE_5SPS      0x13
#define ADS1256_DRATE_2_5SPS    0x03void SPI1_Init(void);
void Init_ADS1256_GPIO(void);
unsigned char SPI_WriteByte(unsigned char TxData);
void ADS1256WREG(unsigned char regaddr,unsigned char databyte);
void ADS1256_Init(void);
unsigned int ADS1256ReadData(unsigned char channel);
unsigned int ADS_Flitter(void);
long double ADS_Voltage(void);#endif

main.h

/********************************************************************************* @file    Project/STM32F10x_StdPeriph_Template/main.c * @author  MCD Application Team* @version V3.5.0* @date    08-April-2011* @brief   Main program body******************************************************************************* @attention** THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.** <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>*******************************************************************************/  /* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "ADS1256.h"
#include <stdio.h>extern  unsigned int ads_value;
extern  long double ads_voltage;int main(void)
{Init_ADS1256_GPIO();ADS1256_Init();while (1){ADS_Voltage();}
}

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STM32F103硬件SPI驱动ADS1256

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