《STM32F030讀取溫濕度傳感器SHT20的C程序源碼經(jīng)實(shí)測實(shí)用過》由會員分享，可在線閱讀，更多相關(guān)《STM32F030讀取溫濕度傳感器SHT20的C程序源碼經(jīng)實(shí)測實(shí)用過（11頁珍藏版）》請?jiān)谘b配圖網(wǎng)上搜索。
1、/**
******************************************************************************
* @file HTU20.x
* @brief HTU20 function
* @cpu STM32F051
* @compiler Keil uVision V5.01
* @author Hanney
* @copyright
* @version V1.0.1
* @date 18-Sept-201
2、5
* @modifydate 20-Sept-2015
******************************************************************************
* @attention
*/
//STM32F051 模擬IIC
//#include "boardAPI.h"
//#include "stm32f0xx.h"
//#include "HTU20.h"
//#include "uart.h"
//#include "delay.h"
#include "stm32f0xx.h"
#in
3、clude "stm32lib.h"
#define HTU20_CLK RCC_AHBPeriph_GPIOB
#define HTU20_SDA_PORT GPIOB
#define HTU20_SCL_PORT GPIOB
#define HTU20_SDA_PIN GPIO_Pin_11
#define HTU20_SCL_PIN GPIO_Pin_10
#define RESOLUTION_11b 0x81 //RH 11 TH 11
#define RESOLUTION_12b 0x01
4、 //RH 8 TH 12
#define RESOLUTION_13b 0x80 //RH 10 TH 13
#define RESOLUTION_14b 0x00 //RH 12 TH 14
#define OTP_disEN 0x02 //不能啟動OPT加載
#define OTP_EN 0x00 //啟動OPT加載
#define RESh 16 //濕度解析度
#define RESt 16 //溫度解析度
#define Measur
5、eDelay 12 //解析延時(shí)時(shí)間 單位ms
typedef unsigned char BYTE;
typedef unsigned int WORD;
BYTE Delayms;
GPIO_InitTypeDef GPIO_InitStructure;
void delayms(BYTE ms);
/**
* @brief Start HTU GPIO port CLK
* @retval None
*/
void HTUInit(void)
{
RCC_AHBPeriphCloc
6、kCmd(HTU20_CLK, ENABLE);
}
/*================================================================
IIC address
================================================================*/
#define SHT20ADDR 0x80
/*==========================================================
7、======
ACK and NACK defination
================================================================*/
#define ACK 0
#define NACK 1
/*================================================================
HTU20D Command Code
=============
8、===================================================*/
/*
Command Code Comment
Trigger Temperature Measurement 0xe3 Hold master
Trigger Humidity Measurement 0xe5 Hold master
Trigger Temperature Measuremeng 0xf3
9、 No Hold master
Trigger Humidity Measurement 0xf5 No Hold master
Write user register 0xe6
Read user register 0xe7
Soft Reset 0xfe
*/
#define SOFT_RESET 0xfe
#define READ_REGISTER 0xe7
#define WRITE_REGISTER 0xe6
10、#define TRIGGER_TEMP 0xf3
#define TRIGGER_HUMI 0xf5
/*================================================================
HTU20 operate interface
================================================================*/
#define HTU20_SCL GPIO_ReadInputDataBit(HTU20_SCL
11、_PORT,HTU20_SCL_PIN)
#define HTU20_SDA GPIO_ReadInputDataBit(HTU20_SDA_PORT,HTU20_SDA_PIN)
/**
* @brief Set SDA pin dircate as output
* @retval None
*/
void HTU20_SDA_OUT()
{
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = HTU20_SDA_PIN;
GPIO_In
12、itStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_2;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(HTU20_SDA_PORT, &GPIO_InitStructure);
}
/**
* @brief Set SDA pin dircate as intpu
13、t
* @retval None
*/
void HTU20_SDA_IN()
{
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = HTU20_SDA_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_2;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
14、 GPIO_Init(HTU20_SDA_PORT, &GPIO_InitStructure);
}
/**
* @brief Set SDA pin as high
* @retval None
*/
void HTU20_SDA_1()
{
GPIO_SetBits(HTU20_SDA_PORT,HTU20_SDA_PIN);
}
/**
* @brief Set SDA pin as low
* @retval None
*/
void HTU20_SDA_0()
{
GPIO_ResetBits(HTU20_S
15、DA_PORT,HTU20_SDA_PIN);
}
/**
* @brief Set SCL pin dircate as output
* @retval None
*/
void HTU20_SCL_OUT()
{
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = HTU20_SCL_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType
16、= GPIO_OType_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_2;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(HTU20_SCL_PORT, &GPIO_InitStructure);
}
/**
* @brief Set SCL pin as high
* @retval None
*/
void HTU20_SCL_1()
{
GPIO_SetBits(HTU20_SCL_PORT,HTU
17、20_SCL_PIN);
}
/**
* @brief Set SCL pin as low
* @retval None
*/
void HTU20_SCL_0()
{
GPIO_ResetBits(HTU20_SCL_PORT,HTU20_SCL_PIN);
}
/*================================================================
Simulation I2C Function
================================
18、================================*/
/**
* @brief A short delay for iic synchronization
* @param t us
* @retval None
*/
void I2CDelay (BYTE t)
{
while(t--)
{
__nop(); __nop(); __nop(); __nop(); __nop();
__nop(); __nop(); __nop(); __nop(); __nop();
__nop(); _
19、_nop(); __nop(); __nop(); __nop();
__nop(); __nop(); __nop(); __nop(); __nop();
__nop(); __nop(); __nop(); __nop(); __nop();
__nop(); __nop(); __nop(); __nop(); __nop();
__nop(); __nop(); __nop(); __nop(); __nop();
}
}
/**
* @brief I2C init
* @retval None
*/
20、
void I2CInit(void)
{
HTUInit();
HTU20_SDA_OUT();
HTU20_SCL_OUT();
HTU20_SDA_1();
I2CDelay(1);
HTU20_SCL_1();
I2CDelay(1);
}
/**
* @brief IIC start signal
* @comment SCL、SDA同為高，SDA跳變成低之后，SCL跳變成低
* @retval None
*/
void I2CStart(void)
{
HTU20_SDA_OUT();
21、HTU20_SDA_1();
HTU20_SCL_1();
I2CDelay(5); //大于4.7us
HTU20_SDA_0();
I2CDelay(5); //大于4us
HTU20_SCL_0();
I2CDelay(5);
}
/**
* @brief IIC Stop Signal
* @commet SCL、SDA同為低，SCL跳變成高之后，SDA跳變成高
* @retval None
*/
void I2CStop(void)
{
HTU20_SDA_OUT();
HTU20_
22、SDA_0();
HTU20_SCL_0();
I2CDelay(5);
HTU20_SCL_1();
I2CDelay(5);
HTU20_SDA_1();
I2CDelay(5);
}
/**
* @brief simu IIC write byte
* @param Write_Byte: data
* @retval None
*/
BYTE I2C_Write_Byte(BYTE Write_Byte)
{
BYTE i;
HTU20_SDA_OUT();
for(i = 0; i <
23、8; ++i)
{
if(Write_Byte & SHT20ADDR)
{
HTU20_SDA_1();
}
else
{
HTU20_SDA_0();
}
I2CDelay(1);
HTU20_SCL_1(); //輸出SDA穩(wěn)定后拉高SCL，從機(jī)檢測到后采樣
I2CDelay(5); //保證足夠長鎖定時(shí)間，確保從機(jī)采樣成功
HTU20_SCL_0();
I2CDelay(1);
Write_Byte <<=
24、 1;
}
I2CDelay(4);
HTU20_SDA_1(); //8位發(fā)送完后釋放數(shù)據(jù)線，準(zhǔn)備接受應(yīng)答信號
HTU20_SCL_1(); //再次拉高SCL，告訴從機(jī)發(fā)送完畢，等待應(yīng)答
I2CDelay(5); //原來是5
HTU20_SDA_IN();
i = 100;
do
{
if(HTU20_SDA == 0) break;
i--;
I2CDelay(4); //原來是5
}while(i>0);
HTU20_SCL_0();
if(i
25、) return ACK;
else return NACK;
// if(HTU20_SDA == 1) //SDA為高，收到NACK
// return NACK;
// else //SDA為低，收到ACK
// return ACK;
// HTU20_SCL_0();
// I2CDelay(15);
}
/**
* @brief simu read byte form IIC
* @param
* @retval None
*/
BYTE I2C_Read_Byte(
26、BYTE AckValue)//receivebyte
{
BYTE i, RDByte = 0;
HTU20_SCL_0(); /*后改的程序*/
HTU20_SDA_OUT();
// HTU20_SCL_0();
HTU20_SDA_1(); //釋放總線，并置數(shù)據(jù)線為輸入
HTU20_SDA_IN();
for (i = 0; i < 8; ++i)
{
HTU20_SCL_1(); //拉高SCL期間，采樣
I2CDelay(2);
RDByte <<= 1;
if(HTU2
27、0_SDA == 1)
{
RDByte |= 0x01;
}
else
{
RDByte &= 0xfe;
}
I2CDelay(1);
HTU20_SCL_0(); //下降沿告知從機(jī)發(fā)送下一位
I2CDelay(6);
}
HTU20_SDA_OUT(); //接受完一個(gè)字節(jié)，發(fā)送ACK or NACK
if(AckValue == 1)
{
HTU20_SDA_1();
}
else
{
HTU20_SDA_
28、0();
}
I2CDelay(3);
HTU20_SCL_1();
I2CDelay(5);
HTU20_SCL_0(); //清時(shí)鐘線
I2CDelay(15);
//HTU20_SDA_1();
return RDByte;
}
/**
* @brief soft reset by transmit reset command
* @retval None
*/
void SoftReset(void)
{
I2CInit();
I2CStart();
I2C_Write_Byte(
29、SHT20ADDR & 0xfe); //I2C address + write
I2C_Write_Byte(SOFT_RESET); //soft reset
I2CStop();
}
/**
* @brief SET HTU20D resolution by write register
* @retval None
*/
void SET_Resolution(void)
{
I2CStart();
if(I2C_Write_Byte(SHT20ADDR & 0xfe) == ACK) //I2C address
30、+ write + ACK
{
if(I2C_Write_Byte(WRITE_REGISTER)==ACK) //寫用戶寄存器
{
if(I2C_Write_Byte(0x83)==ACK); //設(shè)置分辨率 11bit RH% 測量時(shí)間：12ms(typ.)
} // 11bit T℃ 測量時(shí)間： 9ms(typ.)
}
I2CStop();
}
/**
* @brief read
31、sht20s converted result
* @param TempOrHumiCMD: operation command for temperature or humidity
* @retval None
*/
float ReadSht20(char TempOrHumiCMD)
{
float temp;
BYTE MSB,LSB;
float Humidity, Temperature;
SET_Resolution();
I2CStart();
if(I2C_Write_Byte(SHT20ADDR & 0xf
32、e) == ACK) //I2C address + write + ACK
{
if(I2C_Write_Byte(TempOrHumiCMD) == ACK) //command
{
// delayms(MeasureDelay); /*這兩行由下面屏蔽了的兩行改到上面來的*/
// I2CStart();
do
{
delayms(MeasureDelay);
I2CStart();
} while(I2C_Write_By
33、te(SHT20ADDR | 0x01) == NACK); //I2C address + read + NACK
MSB = I2C_Read_Byte(ACK);
LSB = I2C_Read_Byte(ACK);
I2C_Read_Byte(NACK); //Checksum + NACK
I2CStop();
LSB &= 0xfc; //Data (LSB) 的后兩位在進(jìn)行物理計(jì)算前前須置0
34、 temp = (MSB << 8) + LSB;
if (TempOrHumiCMD == ((char)TRIGGER_HUMI))
{
/*-- calculate relative humidity [%RH] --*/
//equation: RH% = -6 + 125 * SRH/2^RESh
Humidity = (temp * 125) / 65536 - 6;
return Humidity;
}
else
{
35、 /*-- calculate temperature [C] --*/
//equation:T = -46.85 + 175.72 * ST/2^RESt
Temperature = (temp * 175.72) / 65536 - 46.85;
return Temperature;
}
}
}
return 0;
}
void delayms(BYTE ms)
{
BYTE t;
for(t=0;t<100;t++)
{
I2CDelay(10);
}
36、// Delayms = ms;
// while(Delayms);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
#define TRIGGER_TEMP 0xf3
#define TRIGGER_HUMI 0xf5
void I2CInit(void);
void SoftReset(void);
void SET_Resolution(void);
float ReadSht20(char TempOrHumiCMD);
STM32F030讀取溫濕度傳感器SHT20的C程序源碼經(jīng)實(shí)測實(shí)用過
