STM32配置IIC接口通信方式参考源码.docx

1、STM32配置IIC接口通信方式参考源码STM32配置IIC接口通信方式参考源码 全部分类 移动开发与应用 WEB前端 架构与运维 程序设计 数据库 操作系统 热点技术 综合 STM32配置IIC接口通信方式参考源码 90阅读0评论2016-11-30zhuimengcanyang 分类：嵌入式 最近在读取SHT3x系列sensor的温度和湿度，用到的是IIC接口。顺便写了一下STM32的IIC接口。这次配置的是STM32内部的IIC接口。注意：读的时候，怎么发送Ack, 和 NAck信号，参考stm的设计文档。 点击(此处)折叠或打开 #include Dev_SHT3X.h #includ

2、e globalDef.h #include stdio.h #define I2C1_OWN_ADDRESS7 0x0A #define I2C_Speed 40000 #define SHT3X_ADDRESS 0x44 /* read out command */ #define CMD_READH_SHX 0x2c #define CMD_READL_SHX 0x06 /* * SHX device: IIC1 * PB6 - SCL * PB7 - SDA */ static void IIC_gpioConfig(void) GPIO_InitTypeDef GPIO_InitSt

3、ructure; /* 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

4、= GPIO_Mode_AF_OD; / 开漏输出 GPIO_Init(GPIOB, &GPIO_InitStructure); static void IIC_modeConfig(void) I2C_InitTypeDef I2C_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_OwnA

5、ddress1 = I2C1_OWN_ADDRESS7; /* setting master address. */ I2C_InitStructure.I2C_Ack = I2C_Ack_Enable ; /* enable ack */ I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; /* 7-bit addressing mode */ I2C_InitStructure.I2C_ClockSpeed = I2C_Speed; /* communication speed = 400k *

6、/ I2C_Init(I2C1, &I2C_InitStructure); I2C_Cmd(I2C1, ENABLE); void SHT3X_InitDevice(void) IIC_gpioConfig(); IIC_modeConfig(); void sht3x_readTempHumi(uint8_t* pBuffer, uint8_t NumByteToRead) while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY); /* detect IIC busy */ I2C_GenerateSTART(I2C1, ENABLE); /* Send S

7、TART condition */ /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT); /* Send slave device address for write */ I2C_Send7bitAddress(I2C1, (SHT3X_ADDRESS 1), I2C_Direction_Transmitter); /* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_T

8、RANSMITTER_MODE_SELECTED); /* Clear EV6 by setting again the PE bit */ I2C_Cmd(I2C1, ENABLE); /* Send the device address to write to */ I2C_SendData(I2C1, CMD_READH_SHX); /* Test on EV8 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED); /* Send the device address to writ

9、e to */ I2C_SendData(I2C1, CMD_READL_SHX); /* Test on EV8 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED); /- /* Send STRAT condition a second time */ I2C_GenerateSTART(I2C1, ENABLE); /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELE

10、CT); /* Send shx address for read */ I2C_Send7bitAddress(I2C1, (SHT3X_ADDRESS 1) | 0x01), I2C_Direction_Receiver); /* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED); /* While there is data to be read */ while(NumByteToRead) if(NumByteToRead = 1) /* D

11、isable Acknowledgement */ I2C_AcknowledgeConfig(I2C1, DISABLE); /* Send STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE); /* Test on EV7 and clear it */ if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED) /* Read a byte from the EEPROM */ *pBuffer = I2C_ReceiveData(I2C1); /* Point to the next lo

12、cation where the byte read will be saved */ pBuffer+; /* Decrement the read bytes counter */ NumByteToRead-; /* Enable Acknowledgement to be ready for another reception */ I2C_AcknowledgeConfig(I2C1, ENABLE); /- static float SHT3X_CalcTemperature(uint16_t rawValue) / calculate temperature C / T = -4

13、5 + 175 * rawValue / (216-1) return 175.0f * (float)rawValue / 65535.0f - 45.0f; /- static float SHT3X_CalcHumidity(uint16_t rawValue) / calculate relative humidity %RH / RH = rawValue / (216-1) * 100 return 100.0f * (float)rawValue / 65535.0f; void sht3x_testTask(void) uint8_t recBuffer6; uint16_t

14、rawdata; float fTemp, fHumi; sht3x_readTempHumi(&recBuffer0, 6); rawdata = recBuffer0; rawdata = (rawdata 8) + recBuffer1; fTemp = SHT3X_CalcTemperature(rawdata); rawdata = recBuffer3; rawdata = (rawdata 8) + recBuffer4; fHumi = SHT3X_CalcHumidity(rawdata); enterCriticalSection(); printf(T: %0.2f, H

15、: %0.1frn, fTemp, fHumi); exitCriticalSection(); 点击(此处)折叠或打开 #ifndef _DEV_SHT3X_H #define _DEV_SHT3X_H #include bsp_iic.h #include bsp_SysConfig.h extern void SHT3X_InitDevice(void); extern void sht3x_testTask(void); #endif /* _DEV_SHT3X_H */ 上一篇：STM32模拟IIC通信方式参考源码 下一篇：linux grep命令ITPUB博客 | ITPUB论坛 | chinaunix论坛 北京皓辰网域网络信息技术有限公司. 版权所有