STM32配置IIC接口通信方式参考源码Word格式文档下载.docx

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STM32配置IIC接口通信方式参考源码Word格式文档下载.docx

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STM32配置IIC接口通信方式参考源码Word格式文档下载.docx

#defineI2C1_OWN_ADDRESS70x0A

#defineI2C_Speed40000

#defineSHT3X_ADDRESS0x44

/*readoutcommand*/

#defineCMD_READH_SHX0x2c

#defineCMD_READL_SHX0x06

/**

*SHXdevice:

IIC1

*PB6-SCL

*PB7-SDA

staticvoidIIC_gpioConfig（void）

{

GPIO_InitTypeDefGPIO_InitStructure;

/*使能与I2C1有关的时钟*/

RCC_APB2PeriphClockCmd（RCC_APB2Periph_GPIOB,ENABLE）;

RCC_APB1PeriphClockCmd（RCC_APB1Periph_I2C1,ENABLE）;

/*PB6-I2C1_SCL、PB7-I2C1_SDA*/

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_OD;

//开漏输出

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=I2C_DutyCycle_2;

/*高电平数据稳定，低电平数据变化SCL时钟线的占空比*/

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_ClockSpeed=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,ENABLE）;

/*SendSTARTcondition*/

/*TestonEV5andclearit*/

while（!

I2C_CheckEvent（I2C1,I2C_EVENT_MASTER_MODE_SELECT））;

/*Sendslavedeviceaddressforwrite*/

I2C_Send7bitAddress（I2C1,（SHT3X_ADDRESS1）,I2C_Direction_Transmitter）;

/*TestonEV6andclearit*/

I2C_CheckEvent（I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED））;

/*ClearEV6bysettingagainthePEbit*/

/*Sendthedeviceaddresstowriteto*/

I2C_SendData（I2C1,CMD_READH_SHX）;

/*TestonEV8andclearit*/

I2C_CheckEvent（I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED））;

I2C_SendData（I2C1,CMD_READL_SHX）;

//------------------------------------------------

/*SendSTRATconditionasecondtime*/

/*Sendshxaddressforread*/

I2C_Send7bitAddress（I2C1,（（SHT3X_ADDRESS1）|0x01）,I2C_Direction_Receiver）;

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（I2C_CheckEvent（I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED））

{

/*ReadabytefromtheEEPROM*/

*pBuffer=I2C_ReceiveData（I2C1）;

/*Pointtothenextlocationwherethebytereadwillbesaved*/

pBuffer++;

/*Decrementthereadbytescounter*/

NumByteToRead--;

}

/*EnableAcknowledgementtobereadyforanotherreception*/

I2C_AcknowledgeConfig（I2C1,ENABLE）;

//-----------------------------------------------------------------------------

staticfloatSHT3X_CalcTemperature（uint16_trawValue）

//calculatetemperature[°

//T=-45+175*rawValue/（2^16-1）

return175.0f*（float）rawValue/65535.0f-45.0f;

staticfloatSHT3X_CalcHumidity（uint16_trawValue）

//calculaterelativehumidity[%RH]

//RH=rawValue/（2^16-1）*100

return100.0f*（float）rawValue/65535.0f;

voidsht3x_testTask（void）

uint8_trecBuffer[6];

uint16_trawdata;

floatfTemp,fHumi;

sht3x_readTempHumi（&

recBuffer[0],6）;

rawdata=recBuffer[0];

rawdata=（rawdata8）+recBuffer[1];

fTemp=SHT3X_CalcTemperature（rawdata）;

rawdata=recBuffer[3];

rawdata=（rawdata8）+recBuffer[4];

fHumi=SHT3X_CalcHumidity（rawdata）;

enterCriticalSection（）;

printf（'

%0.2f,H:

%0.1f\r\n'

fTemp,fHumi）;

exitCriticalSection（）;

}点击（此处）折叠或打开#ifndef_DEV_SHT3X_H

#define_DEV_SHT3X_H

bsp_iic.h'

bsp_SysConfig.h'

externvoidSHT3X_InitDevice（void）;

externvoidsht3x_testTask（void）;

#endif/*_DEV_SHT3X_H*/上一篇：

STM32模拟IIC通信方式参考源码

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