STM32配置IIC接口通信方式參考源碼

1、STM32IICWEBSTM32IIC接口通信方式參考源碼90閱讀0評(píng)論2016-11-30zhuimengcanyangSHT3xsensorIICSTM32IICSTM32IICAck,NAckstm()#includeDev_SHT3X.h#includeglobalDef.h#includestdio.h#defineI2C1_OWN_ADDRESS70 x0A#defineI2C_Speed40000#defineSHT3X_ADDRESS0 x44/*readoutcommand*/0 x2c#defineCMD_READH_SHX0 x2c#defineCMD_READL_SHX

2、0 x06#defineCMD_READL_SHX0 x06SHXdevice:IIC1PB6-SCLPB7-SDA/staticvoidIIC_gpioConfig(void)GPIO_InitTypeDefGPIO_InitStructure;/*使能與I2C1有關(guān)的時(shí)鐘*/RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);/*PB6-I2C1_SCL、PB7-I2C1_SDA*/GPIO_InitStructure.GPIO_Pin=

3、GPIO_Pin_6|GPIO_Pin_7;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_OD;/開漏輸出GPIO_Init(GPIOB,&GPIO_InitStructure);staticvoidIIC_modeConfig(void)I2C_InitTypeDefI2C_InitStructure;I2C_InitStructure.I2C_Mode=I2C_Mode_I2C;/*I2C配置*/I2C_InitStructure.I2C_DutyCycle=

4、I2C_DutyCycle_2;/*高電平數(shù)據(jù)穩(wěn)定，低電平數(shù)據(jù)變化SCL時(shí)鐘線的占空比*/I2C_InitStructure.I2C_OwnAddress1=I2C1_OWN_ADDRESS7;/*settingmasteraddress.*/I2C_InitStructure.I2C_Ack=I2C_Ack_Enable;/*enableack*/I2C_InitStructure.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;/*7-bitaddressingmode*/I2C_InitStructure.I2C_ClockSpe

5、ed=I2C_Speed;/*communicationspeed=400k*/I2C_Init(I2C1,&I2C_InitStructure);I2C_Cmd(I2C1,ENABLE);voidSHT3X_InitDevice(void)IIC_gpioConfig();IIC_modeConfig();voidsht3x_readTempHumi(uint8_t*pBuffer,uint8_tNumByteToRead)while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY);/*detectIICbusy*/I2C_GenerateSTART(I2C1,E

6、NABLE);/*SendSTARTcondition*/*TestonEV5andclearit*/while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT);/*Sendslavedeviceaddressforwrite*/I2C_Send7bitAddress(I2C1,(SHT3X_ADDRESS1),I2C_Direction_Transmitter);/*TestonEV6andclearit*/while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELEC

7、TED);/*ClearEV6bysettingagainthePEbit*/I2C_Cmd(I2C1,ENABLE);/*Sendthedeviceaddresstowriteto*/I2C_SendData(I2C1,CMD_READH_SHX);/*TestonEV8andclearit*/while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED);/*Sendthedeviceaddresstowriteto*/I2C_SendData(I2C1,CMD_READL_SHX);/*TestonEV8andclearit*/

8、while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED);/*SendSTRATconditionasecondtime*/I2C_GenerateSTART(I2C1,ENABLE);/*TestonEV5andclearit*/while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT);/*Sendshxaddressforread*/I2C_Send7bitAddress(I2C1,(SHT3X_ADDRESS1)|0 x01),I2C_Direction_Receiv

9、er);/*TestonEV6andclearit*/while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED);/*Whilethereisdatatoberead*/while(NumByteToRead)if(NumByteToRead=1)/*DisableAcknowledgement*/I2C_AcknowledgeConfig(I2C1,DISABLE);/*SendSTOPCondition*/I2C_GenerateSTOP(I2C1,ENABLE);/*TestonEV7andclearit*/if

10、(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)/*ReadabytefromtheEEPROM*/*pBuffer=I2C_ReceiveData(I2C1);/*Pointtothenextlocationwherethebytereadwillbesaved*/pBuffer+;/*Decrementthereadbytescounter*/NumByteToRead-;/*EnableAcknowledgementtobereadyforanotherreception*/I2C_AcknowledgeConfig(I2C1,EN

11、ABLE);/staticfloatSHT3X_CalcTemperature(uint16_trawValue)/calculatetemperatureC/T=-45+175*rawValue/(2八16-1)return175.0f*(float)rawValue/65535.0f-45.0f;/-staticfloatSHT3X_CalcHumidity(uint16_trawValue)/calculaterelativehumidity%RH/RH=rawValue/(2八16-1)*100return100.0f*(float)rawValue/65535.0f;voidsht3

12、x_testTask(void)uint8_trecBuffer6;uint16_trawdata;floatfTemp,fHumi;sht3x_readTempHumi(&recBuffer0,6);rawdata=recBuffer0;rawdata=(rawdata8)+recBuffer1;fTemp=SHT3X_CalcTemperature(rawdata);rawdata=recBuffer3;rawdata=(rawdata8)+recBuffer4;fHumi=SHT3X_CalcHumidity(rawdata);enterCriticalSection();printf(T:%0.2f,H:%0.1frn,fTemp,fHumi);exitCriticalSection();點(diǎn)擊(此處)折疊或打開#ifndefDEV_SHT3X_H#