技术标签: STM32 温湿度传感器 SHT2x 电子电路 SHT21
#include "stm32f0xx.h"
代替SHT2x.h
#ifndef SHT2x_H
#define SHT2x_H
//---------- Includes ----------------------------------------------------------
#include "I2C_HAL.h"
#include "database.h"
//---------- Defines -----------------------------------------------------------
#define LITTLE_ENDIAN //一定要设置大小端,当设置错误会出现比较大的数据跳动
typedef union {
uint16_t u16; // element specifier for accessing whole u16
int16_t i16; // element specifier for accessing whole i16
struct {
#ifdef LITTLE_ENDIAN // Byte-order is little endian
uint8_t u8L; // element specifier for accessing low u8
uint8_t u8H; // element specifier for accessing high u8
#else // Byte-order is big endian
uint8_t u8H; // element specifier for accessing low u8
uint8_t u8L; // element specifier for accessing high u8
#endif
} s16; // element spec. for acc. struct with low or high u8
} nt16;
// Error codes
typedef enum{
ACK_ERROR = 0x01,
TIME_OUT_ERROR = 0x02,
CHECKSUM_ERROR = 0x04,
UNIT_ERROR = 0x08
}etError;
// CRC
#define SHT2xPOLYNOMIAL 0x131 //P(x)=x^8+x^5+x^4+1 = 100110001
// sensor command
typedef enum{
TRIG_T_MEASUREMENT_HM = 0xE3, // command trig. temp meas. hold master
TRIG_RH_MEASUREMENT_HM = 0xE5, // command trig. humidity meas. hold master
TRIG_T_MEASUREMENT_POLL = 0xF3, // command trig. temp meas. no hold master
TRIG_RH_MEASUREMENT_POLL = 0xF5, // command trig. humidity meas. no hold master
USER_REG_W = 0xE6, // command writing user register
USER_REG_R = 0xE7, // command reading user register
SOFT_RESET = 0xFE // command soft reset
}etSHT2xCommand;
typedef enum {
SHT2x_RES_12_14BIT = 0x00, // RH=12bit, T=14bit
SHT2x_RES_8_12BIT = 0x01, // RH= 8bit, T=12bit
SHT2x_RES_10_13BIT = 0x80, // RH=10bit, T=13bit
SHT2x_RES_11_11BIT = 0x81, // RH=11bit, T=11bit
SHT2x_RES_MASK = 0x81 // Mask for res. bits (7,0) in user reg.
} etSHT2xResolution;
typedef enum {
SHT2x_EOB_ON = 0x40, // end of battery
SHT2x_EOB_MASK = 0x40, // Mask for EOB bit(6) in user reg.
} etSHT2xEob;
typedef enum {
SHT2x_HEATER_ON = 0x04, // heater on
SHT2x_HEATER_OFF = 0x00, // heater off
SHT2x_HEATER_MASK = 0x04, // Mask for Heater bit(2) in user reg.
} etSHT2xHeater;
// measurement signal selection
typedef enum{
HUMIDITY,
TEMP
}etSHT2xMeasureType;
typedef enum{
I2C_ADR_W = 128, // sensor I2C address + write bit
I2C_ADR_R = 129 // sensor I2C address + read bit
}etI2cHeader;
uint8_t SHT2x_ReadUserRegister(uint8_t *pRegisterValue);
uint8_t SHT2x_WriteUserRegister(uint8_t *pRegisterValue);
void SHT2x_InitUserRegister(void);
uint8_t SHT2x_MeasureHM(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand);
float SHT2x_CalcRH(uint16_t u16sRH);
float SHT2x_CalcTemperatureC(uint16_t u16sT);
void SHT2x_Process();
#endif
SHT2x.c
//==============================================================================
// SH2x 温湿度采集程序
//==============================================================================
// File : SHT2x.c
// Author : MC
// Compiler : Keil 5
//==============================================================================
//---------- Includes ----------------------------------------------------------
#include "SHT2x.h"
#include <assert.h> // assert functions
/*
校验
data 校验的数据
nbrOfBytes 数据长度
checksum 校验对比数
返回 0 成功 CHECKSUM_ERROR 4 失败
*/
//==============================================================================
uint8_t SHT2x_CheckCrc(uint8_t data[], uint8_t nbrOfBytes, uint8_t checksum)
//==============================================================================
{
uint8_t crc = 0;
uint8_t byteCtr;
//calculates 8-Bit checksum with given polynomial
for (byteCtr = 0; byteCtr < nbrOfBytes; ++byteCtr)
{
crc ^= (data[byteCtr]);
for (uint8_t bit = 8; bit > 0; --bit)
{
if (crc & 0x80) crc = (crc << 1) ^ SHT2xPOLYNOMIAL;
else crc = (crc << 1);
}
}
if (crc != checksum) return CHECKSUM_ERROR;
else return 0;
}
/*
轮询模式采集温湿度
eSHT2xMeasureType 需要采集的项, HUMIDITY湿度 TEMP温度
pMeasurand 采集回来的原始值
*/
//===========================================================================
uint8_t SHT2x_MeasurePoll(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
//===========================================================================
{
uint8_t checksum; //checksum
uint8_t data[2]; //data array for checksum verification
uint8_t error=0; //error variable
uint16_t i=0; //counting variable
//-- write I2C sensor address and command --
I2c_StartCondition();
I2c_WriteByte (I2C_ADR_W); // I2C Adr
IIC_Wait_Ack();
switch(eSHT2xMeasureType)
{
case HUMIDITY: I2c_WriteByte (TRIG_RH_MEASUREMENT_POLL); break;
case TEMP : I2c_WriteByte (TRIG_T_MEASUREMENT_POLL); break;
}
IIC_Wait_Ack();
//-- poll every 10ms for measurement ready. Timeout after 20 retries (200ms)--
do
{
delay_us(10000); //delay 10ms
I2c_StartCondition();
I2c_WriteByte(I2C_ADR_R);
if(i++ >= 20) break;
} while(IIC_Wait_Ack());
if (i>=20) error |= TIME_OUT_ERROR;
//-- read two data bytes and one checksum byte --
pMeasurand->s16.u8H = data[0] = I2c_ReadByte(ACK);
pMeasurand->s16.u8L = data[1] = I2c_ReadByte(ACK);
checksum=I2c_ReadByte(NO_ACK);
I2c_StopCondition();
//-- verify checksum --
error |= SHT2x_CheckCrc (data,2,checksum);
return error;
}
/*
主机模式采集温度或适度
eSHT2xMeasureType 需要采集的项, HUMIDITY湿度 TEMP温度
pMeasurand 采集回来的原始值
*/
//===========================================================================
uint8_t SHT2x_MeasureHM(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
//===========================================================================
{
uint8_t checksum; //checksum
uint8_t data[2]; //data array for checksum verification
uint8_t error=0; //error variable
uint16_t i; //counting variable
//-- write I2C sensor address and command --
I2c_StartCondition();
error |= I2c_WriteByte (I2C_ADR_W); // I2C Adr
IIC_Wait_Ack();
switch(eSHT2xMeasureType)
{
case HUMIDITY: I2c_WriteByte(TRIG_RH_MEASUREMENT_HM); break;
case TEMP : I2c_WriteByte(TRIG_T_MEASUREMENT_HM); break;
default: assert(0);
}
IIC_Wait_Ack();
I2c_StartCondition();
I2c_WriteByte (I2C_ADR_R);
IIC_Wait_Ack();
//-- read two data bytes and one checksum byte --
pMeasurand->s16.u8H = data[0] = I2c_SHT21WithSCLReadByte(ACK);
pMeasurand->s16.u8L = data[1] = I2c_ReadByte(ACK);
checksum=I2c_ReadByte(NO_ACK);
I2c_StopCondition();
// //-- verify checksum --
error |= SHT2x_CheckCrc (data,2,checksum);
return error;
}
/*
原始值转换为湿度
u16sRH 原始值
返回 湿度
*/
//==============================================================================
float SHT2x_CalcRH(uint16_t u16sRH)
//==============================================================================
{
float humidityRH; // variable for result
u16sRH &= ~0x0003; // clear bits [1..0] (status bits)
//-- calculate relative humidity [%RH] --
humidityRH = -6.0 + (125.0*(float)u16sRH)/65536; // RH= -6 + 125 * SRH/2^16
return humidityRH;
}
/*
原始值转换为温度
u16sRH 原始值
返回 温度
*/
//==============================================================================
float SHT2x_CalcTemperatureC(uint16_t u16sT)
//==============================================================================
{
float temperatureC; // variable for result
u16sT &= ~0x0003; // clear bits [1..0] (status bits)
//-- calculate temperature --
temperatureC= -46.85 + (175.72*(float)u16sT)/65536; //T= -46.85 + 175.72 * ST/2^16
return temperatureC;
}
/*
读取用户寄存器
pRegisterValue 存放数据的指针
返回 0 成功 CHECKSUM_ERROR 4 失败
*/
//===========================================================================
uint8_t SHT2x_ReadUserRegister(uint8_t *pRegisterValue)
//===========================================================================
{
uint8_t checksum; //variable for checksum byte
uint8_t error=0; //variable for error code
I2c_StartCondition();
error |= I2c_WriteByte (I2C_ADR_W);
IIC_Wait_Ack();
error |= I2c_WriteByte (USER_REG_R);
IIC_Wait_Ack();
I2c_StartCondition();
error |= I2c_WriteByte (I2C_ADR_R);
IIC_Wait_Ack();
*pRegisterValue = I2c_ReadByte(NO_ACK);
I2c_StopCondition();
return error;
}
/*
写入用户寄存器
pRegisterValue 待写入的数
返回 0 成功 CHECKSUM_ERROR 4 失败
*/
//===========================================================================
uint8_t SHT2x_WriteUserRegister(uint8_t *pRegisterValue)
//===========================================================================
{
uint8_t error=0; //variable for error code
I2c_StartCondition();
error |= I2c_WriteByte (I2C_ADR_W);
IIC_Wait_Ack();
error |= I2c_WriteByte (USER_REG_W);
IIC_Wait_Ack();
error |= I2c_WriteByte (*pRegisterValue);
IIC_Wait_Ack();
I2c_StopCondition();
return error;
}
/*
初始化用户寄存器
*/
//===========================================================================
void SHT2x_InitUserRegister(void)
//===========================================================================
{
uint8_t userRegister=0;
userRegister = 0x00;//(userRegister & ~SHT2x_RES_MASK) | SHT2x_RES_10_13BIT;
SHT2x_WriteUserRegister(&userRegister); //write changed user reg
}
/*
用户线程
*/
nt16 sRH={
0}; //variable for raw humidity ticks
nt16 sT={
0}; //variable for raw temperature ticks
void SHT2x_Process(){
int ret;
SHT2x_ReadUserRegister(&WorkUnion.input.userRegister); //get actual user reg
ret=SHT2x_MeasureHM(TEMP, &sT);
WorkUnion.input.Tempreture=SHT2x_CalcTemperatureC(sT.u16);
delay_ms(100);
ret=SHT2x_MeasureHM(HUMIDITY, &sRH);
WorkUnion.input.Humidity=SHT2x_CalcRH(sRH.u16);//if(ret==0)
}
I2C_HAL.h
#ifndef I2C_HAL_H
#define I2C_HAL_H
#ifndef I2C_HAL_H
#define I2C_HAL_H
//---------- Includes ----------------------------------------------------------
#include "database.h"
//---------- Defines -----------------------------------------------------------
//IO口操作宏定义
#define GPIOSCL GPIOA
#define PinSCL GPIO_Pin_2
#define GPIOSDA GPIOA
#define PinSDA GPIO_Pin_3
//IO方向设置
#define SDA_IN() {GPIOA->MODER&=0XFFFFFF3F;}
#define SDA_OUT() {uint32_t Temp=GPIOA->MODER;\
Temp&=0XFFFFFF3F;\
Temp|=0x00000040;\
GPIOA->MODER=Temp;}
#define SCL_IN() {GPIOA->MODER&=0XFFFFFFCF;}
#define SCL_OUT() {uint32_t Temp=GPIOA->MODER;\
Temp&=0XFFFFFFCF;\
Temp|=0x00000010;\
GPIOA->MODER=Temp;}
//IO操作函数
#define IIC_SCL1 GPIO_SetBits(GPIOSCL,PinSCL)
#define IIC_SCL0 GPIO_ResetBits(GPIOSCL,PinSCL) //SCL
#define IIC_SDAx(x) GPIO_WriteBit(GPIOSDA,PinSDA,x)
#define IIC_SDA1 GPIO_SetBits(GPIOSDA,PinSDA) //SDA
#define IIC_SDA0 GPIO_ResetBits(GPIOSDA,PinSDA) //SDA
#define READ_SDA GPIO_ReadInputDataBit(GPIOSDA,PinSDA) //输入SDA
#define READ_SCL GPIO_ReadInputDataBit(GPIOSDA,PinSCL) //输入SCL
//---------- Enumerations ------------------------------------------------------
// I2C level
typedef enum{
LOW = 0,
HIGH = 1,
}etI2cLevel;
// I2C acknowledge
typedef enum{
ACK = 0,
NO_ACK = 1,
}etI2cAck;
//==============================================================================
void I2c_Init ();
//==============================================================================
//Initializes the ports for I2C interface
//==============================================================================
void I2c_StartCondition ();
//==============================================================================
// writes a start condition on I2C-bus
// input : -
// output: -
// return: -
// note : timing (delay) may have to be changed for different microcontroller
// _____
// SDA: |_____
// _______
// SCL : |___
//==============================================================================
void I2c_StopCondition ();
//==============================================================================
// writes a stop condition on I2C-bus
// input : -
// output: -
// return: -
// note : timing (delay) may have to be changed for different microcontroller
// _____
// SDA: _____|
// _______
// SCL : ___|
//===========================================================================
uint8_t I2c_WriteByte (uint8_t txByte);
//===========================================================================
// writes a byte to I2C-bus and checks acknowledge
// input: txByte transmit byte
// output: -
// return: error
// note: timing (delay) may have to be changed for different microcontroller
//===========================================================================
uint8_t I2c_ReadByte (etI2cAck ack);
//===========================================================================
// reads a byte on I2C-bus
// input: rxByte receive byte
// output: rxByte
// note: timing (delay) may have to be changed for different microcontroller
u8 IIC_Wait_Ack(void);
uint8_t I2c_SHT21WithSCLReadByte(etI2cAck ack);
#endif
I2C_HAL.c
//---------- Includes ----------------------------------------------------------
#include "I2C_HAL.h"
//==============================================================================
void I2c_Init ()
//==============================================================================
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA , ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
IIC_SDA0; // Set port as output for configuration
IIC_SCL0; // Set port as output for configuration
SDA_OUT(); // Set SDA level as low for output mode
SCL_OUT();
IIC_SDA1; // I2C-bus idle mode SDA released (input)
IIC_SCL1; // I2C-bus idle mode SCL released (input)
}
//==============================================================================
void I2c_StartCondition ()
//==============================================================================
{
SDA_OUT();
SCL_OUT();
IIC_SDA1;
IIC_SCL1;
delay_us(20); // hold time start condition (t_HD;STA)
IIC_SDA0;
delay_us(20); // hold time start condition (t_HD;STA)
IIC_SCL0;
delay_us(20);
}
//==============================================================================
void I2c_StopCondition ()
//==============================================================================
{
SDA_OUT();
SCL_OUT();
IIC_SDA0;
IIC_SCL0;
delay_us(20); // set-up time stop condition (t_SU;STO)
IIC_SCL1;
delay_us(20); // set-up time stop condition (t_SU;STO)
IIC_SDA1;
delay_us(20);
}
//不产生ACK应答
void IIC_NAck(void)
{
SCL_OUT();
SDA_OUT();
IIC_SCL0;
IIC_SDA1;
delay_us(10);
IIC_SCL1;
delay_us(10);
IIC_SCL0;
}
//产生ACK应答
void IIC_Ack(void)
{
SCL_OUT();
SDA_OUT();
IIC_SCL0;
IIC_SDA0;
delay_us(10);
IIC_SCL1;
delay_us(10);
IIC_SCL0;
}
//等待应答信号到来
//返回值:1,接收应答失败
// 0,接收应答成功
u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SCL1;delay_us(5);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
//I2c_StopCondition();
return 1;
}
delay_us(100);
}
IIC_SCL0;//时钟输出0
return 0;
}
//==============================================================================
uint8_t I2c_WriteByte (uint8_t txByte)
//==============================================================================
{
uint8_t mask,error=0;
u8 t;
SCL_OUT();
SDA_OUT();
IIC_SCL0;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
IIC_SDAx((txByte&0x80)>>7);
txByte<<=1;
delay_us(10); //对TEA5767这三个延时都是必须的
IIC_SCL1;
delay_us(10);
IIC_SCL0;
delay_us(10);
}
return error; //return error code
}
//==============================================================================
uint8_t I2c_ReadByte (etI2cAck ack)
//==============================================================================
{
unsigned char i,receive=0;
SCL_OUT();
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC_SCL0;
delay_us(5);
IIC_SCL1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(5);
}
if (ack==ACK)
IIC_Ack(); //发送ACK
else
IIC_NAck();//发送nACK
return receive;
}
//==============================================================================
uint8_t I2c_SHT21WithSCLReadByte(etI2cAck ack)
//==============================================================================
{
uint16_t i;
unsigned char receive=0;
SCL_IN(); // set SCL I/O port as input
SDA_IN();
for(i=0; i<10000; i++) // wait until master hold is released or
{
delay_us(10); // a timeout (~1s) is reached
if (READ_SCL==1){
if(READ_SDA)receive++;
break;
}
}
SCL_OUT();
SDA_IN();//SDA设置为输入
for(i=0;i<7;i++ )
{
IIC_SCL0;
delay_us(5);
IIC_SCL1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(5);
}
if (ack==ACK)
IIC_Ack(); //发送ACK
else
IIC_NAck();//发送nACK
return receive;
}
文章浏览阅读2w次,点赞7次,收藏51次。四个步骤1.创建C++ Win32项目动态库dll 2.在Win32项目动态库中添加 外部依赖项 lib头文件和lib库3.导出C接口4.c#调用c++动态库开始你的表演...①创建一个空白的解决方案,在解决方案中添加 Visual C++ , Win32 项目空白解决方案的创建:添加Visual C++ , Win32 项目这......_c#调用lib
文章浏览阅读4.6k次。苹方字体是苹果系统上的黑体,挺好看的。注重颜值的网站都会使用,例如知乎:font-family: -apple-system, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Microsoft YaHei, Source Han Sans SC, Noto Sans CJK SC, W..._ubuntu pingfang
文章浏览阅读159次。表单表单概述表单标签表单域按钮控件demo表单标签表单标签基本语法结构<form action="处理数据程序的url地址“ method=”get|post“ name="表单名称”></form><!--action,当提交表单时,向何处发送表单中的数据,地址可以是相对地址也可以是绝对地址--><!--method将表单中的数据传送给服务器处理,get方式直接显示在url地址中,数据可以被缓存,且长度有限制;而post方式数据隐藏传输,_html表单的处理程序有那些
文章浏览阅读1.2k次。使用说明:开启Google的登陆二步验证(即Google Authenticator服务)后用户登陆时需要输入额外由手机客户端生成的一次性密码。实现Google Authenticator功能需要服务器端和客户端的支持。服务器端负责密钥的生成、验证一次性密码是否正确。客户端记录密钥后生成一次性密码。下载谷歌验证类库文件放到项目合适位置(我这边放在项目Vender下面)https://github.com/PHPGangsta/GoogleAuthenticatorPHP代码示例://引入谷_php otp 验证器
文章浏览阅读4.3k次,点赞5次,收藏11次。matplotlib.plot画图横坐标混乱及间隔处理_matplotlib更改横轴间距
文章浏览阅读2.2k次。①Storage driver 处理各镜像层及容器层的处理细节,实现了多层数据的堆叠,为用户 提供了多层数据合并后的统一视图②所有 Storage driver 都使用可堆叠图像层和写时复制(CoW)策略③docker info 命令可查看当系统上的 storage driver主要用于测试目的,不建议用于生成环境。_docker 保存容器
文章浏览阅读834次,点赞27次,收藏13次。网络拓扑结构是指计算机网络中各组件(如计算机、服务器、打印机、路由器、交换机等设备)及其连接线路在物理布局或逻辑构型上的排列形式。这种布局不仅描述了设备间的实际物理连接方式,也决定了数据在网络中流动的路径和方式。不同的网络拓扑结构影响着网络的性能、可靠性、可扩展性及管理维护的难易程度。_网络拓扑csdn
文章浏览阅读1.8k次,点赞5次,收藏8次。IOS系统Date的坑要创建一个指定时间的new Date对象时,通常的做法是:new Date("2020-09-21 11:11:00")这行代码在 PC 端和安卓端都是正常的,而在 iOS 端则会提示 Invalid Date 无效日期。在IOS年月日中间的横岗许换成斜杠,也就是new Date("2020/09/21 11:11:00")通常为了兼容IOS的这个坑,需要做一些额外的特殊处理,笔者在开发的时候经常会忘了兼容IOS系统。所以就想试着重写Date函数,一劳永逸,避免每次ne_date.prototype 将所有 ios
文章浏览阅读5.3k次。方法一:用PLSQL Developer工具。 1 在PLSQL Developer的sql window里输入select * from test for update; 2 按F8执行 3 打开锁, 再按一下加号. 鼠标点到第一列的列头,使全列成选中状态,然后粘贴,最后commit提交即可。(前提..._excel导入pl/sql
文章浏览阅读83次。Git常用命令速查手册1、初始化仓库git init2、将文件添加到仓库git add 文件名 # 将工作区的某个文件添加到暂存区 git add -u # 添加所有被tracked文件中被修改或删除的文件信息到暂存区,不处理untracked的文件git add -A # 添加所有被tracked文件中被修改或删除的文件信息到暂存区,包括untracked的文件...
文章浏览阅读202次。分享119个ASP.NET源码总有一个是你想要的_千博二手车源码v2023 build 1120
文章浏览阅读1.8k次。版权声明:转载请注明出处 http://blog.csdn.net/irean_lau。目录(?)[+]1、缺省构造函数。2、缺省拷贝构造函数。3、 缺省析构函数。4、缺省赋值运算符。5、缺省取址运算符。6、 缺省取址运算符 const。[cpp] view plain copy_空类默认产生哪些类成员函数