关于ADS1118模数转换器的问题
我采用的是将cs引脚直接与GND相连，然后怎么能进行温度转化呢，用的是stm32的spi模块
CPOL设置为低电平CPHA设置为下降沿，然后每次都是给ADS1118发送 同样的设置
/**
******************************************************************************
* @file ADS1118.c
* @author HEU-ICEC-SAST SunZhengYuan
* @version V1.0
* @date 20-7-2014
* @brief Analog to Digital Converter Driver
******************************************************************************
* @attention The source of this program come from the Internet.
*and intergrated by Sunzhengyuan.
******************************************************************************
*/
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_spi.h"
#include "ADS1118.h"
//----------------------Data Buffer--------------------------------------
/**THESE PARAM TO STORE THE DATA THAT WILL TRANSMIT VIA SPI,AND RECERIVE
*THE DATA FROM SPI
***/
volatile uint8_t readata1;
volatile uint8_t readata2;
volatile uint8_t readata3;
volatile uint8_t readata4;
volatile uint32_t readata;
/**********************************************************************
**********************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO , ENABLE);
/* //LDO power2 control pin
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure); //B??
//POWER OFF CONTROL PIN
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //KEYPOWER PA15
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); */
//ADS1118
//AD_SPI1_CS PA4
//AD_SPI1_SCK PA5
//AD_SPI1_MISO PA6
//AD_SPI1_MOSI PA7
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
uint16_t ADS_configuration(void)
{
uint16_t ADS_Con;
ADS_InitTypeDef ADS_InitStructure;
ADS_InitStructure.stru.OS = SINGLE_CONVER;
ADS_InitStructure.stru.MUX = AINPN_0_1;
ADS_InitStructure.stru.PGA = PGA_2048;
ADS_InitStructure.stru.MODE = CONTIOUS;
ADS_InitStructure.stru.DR = DR_128_SPS;
ADS_InitStructure.stru.TS_MODE = TEMPERATURE_MODE; //TEMPERATURE MODE
ADS_InitStructure.stru.PULLUP = PULL_UP_DIS;
ADS_InitStructure.stru.NOP = DATA_VALID;
ADS_InitStructure.stru.CNV_RDY_FL = DATA_NREADY;
ADS_Con=ADS_InitStructure.word;
return (ADS_Con);
}
/**********************************************************************
**********************************************************************/
void SPI_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//AD_SPI1_CS PA4
//AD_SPI1_SCK PA5
//AD_SPI1_MISO PA6
//AD_SPI1_MOSI PA7
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //???
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //???
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8?
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //???? ?????,SCK?????
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
// SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //???? ??????????????
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //????NSS
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128; //????? SYSCLK/16
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //??????
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC??????????7
SPI_Init(SPI1, &SPI_InitStructure);
/* ??SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
/**********************************************************************
**********************************************************************/
void delay( uint32_t nCount )
{
for(; nCount != 0; nCount--)
{
;
}
}
/**********************************************************************
**********************************************************************/
uint8_t SPI1_SendByte(uint8_t byte)
{
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
{
;
}
SPI_I2S_SendData(SPI1, byte);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
{
;
}
return SPI_I2S_ReceiveData(SPI1);
}
/**********************************************************************
**********************************************************************/
uint32_t SPI_RW_Reg(uint16_t CofigReg)
{
// delay(10);
delay(10);
readata1=SPI1_SendByte((uint8_t)(CofigReg>>8));
readata2=SPI1_SendByte((uint8_t)CofigReg);
readata3=SPI1_SendByte((uint8_t)(CofigReg>>8));
readata4=SPI1_SendByte((uint8_t)CofigReg);
readata= (uint32_t)readata4|((uint32_t)readata3<<8)|((uint32_t)readata2<<16)|((uint32_t)readata1<<24);
// delay(1000);
delay(1000);
//ads_cs_1();
return readata;
}
#ifndef ADS1118_H
#define ADS1118_H
#include "stdint.h"
// ------ Public constants -----------------------------------------
//------------------------------------------------------------------
// Should Not Need To Edit The Section Blow
//------------------------------------------------------------------
// ------ Define and Typedefine-------------------------------------
//#define AD_SPI1_CS PA4
//#define AD_SPI1_SCK PA5
//#define AD_SPI1_MISO PA6
//#define AD_SPI1_MOSI PA7
//( Config Register )
//Operational status/single-shot conversion start
#define CONFIG_BIT_OS (1<<15)
//MUX[2:0]: Input multiplexer configuration
#define CONFIG_BIT_MUX (7<<12)
//PGA[2:0]: Programmable gain amplifier configuration
#define CONFIG_BIT_PGA (7<<9)
//MODE: Device operating mode
#define CONFIG_BIT_MODE (1<<8)
//DR[2:0]: Data rate
#define CONFIG_BIT_DR (7<<5)
//TS_MODE: Temperature sensor mode
#define CONFIG_BIT_TS_MODE (1<<4)
//PULL_UP_EN: Pull-up enable
#define CONFIG_BIT_PULLUP_EN (1<<3)
//NOP: No operation
#define CONFIG_BIT_NOP (3<<1)
//CNV_RDY_FL: Conversion ready flag
#define CONFIG_BIT_CNV_RDY_FL (1<<0)
// ------ Public data type declarations ----------------------------
typedef union
{
//uint8_t Data_MSB :8;
//uint8_t Data_LSB :8;
struct
{
volatile uint8_t CNV_RDY_FL :1; //low
volatile uint8_t NOP :2;
volatile uint8_t PULLUP :1;
volatile uint8_t TS_MODE :1;
volatile uint8_t DR :3;
volatile uint8_t MODE :1;
volatile uint8_t PGA :3;
volatile uint8_t MUX :3;
volatile uint8_t OS :1; //high
} stru;
volatile uint16_t word;
} ADS_InitTypeDef;
typedef enum
{
CONVERING = 0x0,
SINGLE_CONVER = 0x1
} ADS_OS_TypeDef;
typedef enum
{
AINPN_0_1 = 0x0,
AINPN_0_3 = 0x1,
AINPN_1_3 = 0x2,
AINPN_2_3 = 0x3,
AINPN_0_GND= 0x4,
AINPN_1_GND= 0x5,
AINPN_2_GND= 0x6,
AINPN_3_GND= 0x7
} ADS_MUX_TypeDef;
typedef enum
{
PGA_6144 = 0x0,
PGA_4096 = 0x1,
PGA_2048 = 0x2,
PGA_1024 = 0x3,
PGA_512 = 0x4,
PGA_256 = 0x5
} ADS_PGA_TypeDef;
typedef enum
{
CONTIOUS = 0x0,
SINGLE_SHOT = 0x1
} ADS_MODE_TypeDef;
typedef enum
{
DR_8_SPS = 0x0,
DR_16_SPS = 0x1,
DR_32_SPS = 0x2,
DR_64_SPS = 0x3,
DR_128_SPS = 0x4,
DR_250_SPS = 0x5,
DR_475_SPS = 0x6,
DR_860_SPS = 0x7
} ADS_DATARATE_TypeDef;
typedef enum
{
ADC_MODE = 0x0,
TEMPERATURE_MODE = 0x1
} ADS_TSMODE_TypeDef;
typedef enum
{
PULL_UP_DIS = 0x0,
PULL_UP_EN = 0x1
} ADS_PULL_TypeDef;
typedef enum
{
DATA_VALID = 0x1,
DATA_INVALID = 0x0
} ADS_NOP_TypeDef;
typedef enum
{
DATA_READY = 0x0,
DATA_NREADY = 0x1
} ADS_RDY_TypeDef;
/*******************************************************************
**** DO AS THE DIRECTION ****
*******************************************************************/
// There is no need to use this part when CS is tied to the Pin of GND.
/*
// ------ Public function prototypes -------------------------------
#define ads_cs_0() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
#define ads_cs_1() GPIO_SetBits(GPIOA, GPIO_Pin_4)
*/
void delay( uint32_t nCount );
/**
*IF you want to configuration ADS1118,you should add these two
*configuration function to your Process first .
**/
void GPIO_Configuration(void);
void SPI_Configuration(void);
/**
*You can config the ADS in the ADS_InitInstrcutre,when you use
*a parameter to rever a reval of this function;
* EXA: ADS_Con=ADS_configuration();
*Then,when you want to get a converted value ,just use a new
*parameter to do like this
* EXA: Converted_value=SPI_RW_Reg(ADS_Con);
*then the value is in this parameter "Converted_value"
**/
uint16_t ADS_configuration(void);
uint32_t SPI_RW_Reg(uint16_t CofigReg);
/**
*Private function
**/
uint8_t SPI1_SendByte(uint8_t byte);
#endif
/*******************************************************************
**** END OF FILE ****
*******************************************************************/
程序本来是从网上找的，我后来改的，唯一的优点是接上电路能检测单存在DRDY低电平，但是示数却总是卡住，每次按复位数字又变化，但是好像是随机数，拜托，希望高手给看看是不是程序的问题
你好，
在CS引脚一直拉低的情况下，ADS1118内部进行转换，当新的转换结果可以读取的时候，DOUT/DRDY 就被拉低了，可以用这个信号作为中断信号，触发MCU开始读取转换结果。
数据传送的具体细节可以参考数据手册23页 32-Bit Data Transmission Cycle 章节。
建议将 通信时序 用示波器采出来，跟数据手册第六页的SPI TIMING CHARACTERISTICS做比较，也可以上传以便分析。
不太清楚你所描述的具体问题，能否将你的测试过程详细地描述一下？
请问有没有参考程序，我想看看究竟是我电路板的问题还是程序的问题，因为一直采不到波形
sunzhengyuan@qq.com
你好，
没有C语言的参考程序，有ADS1118EVM的参考程序：ADS1118EVM Source Code
采不到波形？你的输入是什么样的信号？
这个ADC配置起来不复杂，先检查供电电压，输入电压；然后检查接口时序。一般读出数据来是没问题的。建议输入DC电压测试先。