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1、* * file HTU20.x* brief HTU20 function* cpu STM32F051* compiler KeiluVision V5.01* author Hanney* copyright* version V1.0.1* date 18-Sept-2015* modifydate20-Sept-2015* * attention*/STM32F051 模擬IIC/#include boardAPI.h/#include stm32f0xx.h/#include HTU20.h/#include uart.h/#include delay.h#include stm3
2、2f0xx.h#include 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 /RH 8 TH 12#define RESOLUTION_13b 0x80 /RH 10 T
3、H 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 MeasureDelay 12 /解析延時時間單位mstypedef unsigned char BYTE;typedef unsigned int WORD;BYTE Delayms;GPIO_InitTypeDef GPIO_InitStructure;voiddelayms(BY
4、TE ms;/* brief Start HTU GPIO port CLK* retvalNone*/voidHTUInit(voidRCC_AHBPeriphClockCmd(HTU20_CLK, ENABLE;/*=IIC address=*/ #define SHT20ADDR 0x80/*= ACK and NACK defination=*/ #define ACK 0#define NACK 1/*=HTU20D Command Code=*/ /*Command Code Comment Trigger Temperature Measurement 0xe3 Hold mas
5、ter Trigger Humidity Measurement 0xe5 Hold master Trigger Temperature Measuremeng 0xf3 No Hold master Trigger Humidity Measurement 0xf5 No Hold master Write user register 0xe6Read user register 0xe7Soft Reset 0xfe*/#define SOFT_RESET 0xfe#define READ_REGISTER 0xe7#define WRITE_REGISTER 0xe6#define T
6、RIGGER_TEMP 0xf3#define TRIGGER_HUMI 0xf5/*=HTU20 operate interface=*/#define HTU20_SCL GPIO_ReadInputDataBit(HTU20_SCL_PORT,HTU20_SCL_PIN #define HTU20_SDA GPIO_ReadInputDataBit(HTU20_SDA_PORT,HTU20_SDA_PIN/* brief Set SDA pin dircate as output* retvalNone*/void HTU20_SDA_OUT(GPIO_StructInit(&GPIO_
7、InitStructure;GPIO_InitStructure.GPIO_Pin = HTU20_SDA_PIN;GPIO_InitStructure.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
8、 Set SDA pin dircate as intput* retvalNone*/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;GPIO_Init(HTU20_S
9、DA_PORT, &GPIO_InitStructure;/* brief Set SDA pin as high* retvalNone*/void HTU20_SDA_1(GPIO_SetBits(HTU20_SDA_PORT,HTU20_SDA_PIN;/* brief Set SDA pin as low* retvalNone*/void HTU20_SDA_0(GPIO_ResetBits(HTU20_SDA_PORT,HTU20_SDA_PIN; /* brief Set SCL pin dircate as output* retvalNone*/void HTU20_SCL_
10、OUT(GPIO_StructInit(&GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = HTU20_SCL_PIN; GPIO_InitStructure.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_SCL_POR
11、T, &GPIO_InitStructure;/* brief Set SCL pin as high* retvalNone*/void HTU20_SCL_1(GPIO_SetBits(HTU20_SCL_PORT,HTU20_SCL_PIN;/* brief Set SCL pin as low* retvalNone*/void HTU20_SCL_0(GPIO_ResetBits(HTU20_SCL_PORT,HTU20_SCL_PIN;/*=Simulation I2C Function=*/* brief A short delay for iic synchronization
12、* param t us* retvalNone*/void I2CDelay (BYTE twhile(t-_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;_nop(; _nop(; _nop(; _nop(; _nop(;/* brie
13、f I2Cinit* retvalNone*/void I2CInit(voidHTUInit(;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(voidHTU20_SDA_OUT(;HTU20_SDA_1(;HTU20_SCL_1(;I2CDelay(5; /大于4.7usHTU20_SDA_0(;I2C
14、Delay(5; /大于4usHTU20_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* retvalNone*/void I2CStop(voidHTU20_SDA_OUT(;HTU20_SDA_0(;HTU20_SCL_0(;I2CDelay(5;HTU20_SCL_1(;I2CDelay(5;HTU20_SDA_1(;I2CDelay(5;/* brief simu IIC write byte* paramWrite_Byte: data* retvalNone*/BYTE
15、 I2C_Write_Byte(BYTE Write_ByteBYTE i;HTU20_SDA_OUT(;for(i = 0; i 8; +iif(Write_Byte& SHT20ADDRHTU20_SDA_1(;elseHTU20_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; /保證足夠長鎖定時間,確保從機(jī)采樣成功HTU20_SCL_0(;I2CDelay(1;Write_Byte0;HTU20_SCL_0(;if(i return ACK;else return NACK;/ if(HTU20_SDA
16、 = 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* retvalNone*/BYTE I2C_Read_Byte(BYTE AckValue/receivebyteBYTE 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_
17、IN(;for (i = 0; i 8; +iHTU20_SCL_1(; /拉高SCL期間,采樣I2CDelay(2;RDByte= 1;if(HTU20_SDA = 1RDByte |= 0x01;elseRDByte&= 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(; /接受完一個字節(jié),發(fā)送ACK or NACK if(AckValue = 1HTU20_SDA_1(;elseHTU20_SDA_0(;I2CDelay(3;HTU20_SCL_1(;I2CDelay(5;HTU20_SCL_0(;
18、/清時鐘線I2CDelay(15;/HTU20_SDA_1(;returnRDByte;/* brief soft reset by transmit reset command* retvalNone*/voidSoftReset(voidI2CInit(;I2CStart(;I2C_Write_Byte(SHT20ADDR & 0xfe; /I2C address + writeI2C_Write_Byte(SOFT_RESET; /soft resetI2CStop(;/* brief SET HTU20D resolution by write register* retvalNone
19、*/voidSET_Resolution(voidI2CStart(;if(I2C_Write_Byte(SHT20ADDR & 0xfe = ACK /I2C address + write + ACKif(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% 測量時間: 12ms(typ. / 11bit T測量時間: 9ms(typ.I2CStop(;/* brief read sht20s converted result* paramTempOrHumiCMD: ope
20、ration command for temperature or humidity* retvalNone*/float ReadSht20(char TempOrHumiCMDfloat temp;BYTE MSB,LSB;float Humidity, Temperature;SET_Resolution(;I2CStart(;if(I2C_Write_Byte(SHT20ADDR & 0xfe = ACK /I2C address + write + ACKif(I2C_Write_Byte(TempOrHumiCMD = ACK /command/ delayms(MeasureDe
21、lay; /*這兩行由下面屏蔽了的兩行改到上面來的*/ I2CStart(;dodelayms(MeasureDelay;I2CStart(; while(I2C_Write_Byte(SHT20ADDR | 0x01 = NACK; /I2C address + read + NACKMSB = I2C_Read_Byte(ACK;LSB = I2C_Read_Byte(ACK;I2C_Read_Byte(NACK; /Checksum + NACKI2CStop(;LSB &= 0xfc; /Data (LSB 的后兩位在進(jìn)行物理計算前前須置0temp = (MSB 8 + LSB;if
22、(TempOrHumiCMD = (charTRIGGER_HUMI/*- calculate relative humidity %RH -*/equation: RH% = -6 + 125 * SRH/2REShHumidity = (temp * 125 / 65536 - 6;return Humidity;else/*- calculate temperature C -*/equation:T = -46.85 + 175.72 * ST/2REStTemperature = (temp * 175.72 / 65536 - 46.85;return Temperature;return 0;voiddelayms(BYTE msBYTE t;for(t=0;t100;t+ I2CDelay(10; / / Delayms = ms; while(Delayms; / #define TRIGGER_TEMP #define TRIGGER_HUMI 0xf3 0xf5 void I2CInit(void; voidSoftReset(void; voidSET_Resolution(void; float ReadSht20(char TempOrHumiCMD;
STM32F030讀取溫濕度傳感器SHT20的C程序源碼經(jīng).
