STM32配置IIC接口通信方式參考源碼.doc

1、STM32 配置 IIC 接口通信方式參考源碼全部分類移動(dòng)開發(fā)與應(yīng)用WEB 前端架構(gòu)與運(yùn)維序設(shè)計(jì)數(shù)據(jù)庫(kù)操作系統(tǒng)熱點(diǎn)技術(shù)綜合STM32 配置接口通信方式參考源碼90 閱讀0 評(píng)論 2016-11-30程IICzhuimengcanyang分類：嵌入式最近在讀取SHT3x 系列 sensor 的溫度和濕度，用到的是IIC接口。順便寫了一下STM32的IIC接口。這次配置的是STM32內(nèi)部的IIC接口。注意：讀的時(shí)候，怎么發(fā)送Ack,和NAck信號(hào)，參考stm 的設(shè)計(jì)文檔。#include Dev_SHT3X.h點(diǎn)擊 (此處 )折疊或打開#include globalDef.h#include st

2、dio.h#define I2C1_OWN_ADDRESS7 0x0A#define I2C_Speed40000#define SHT3X_ADDRESS0x44/* read out command */#define CMD_READH_SHX0x2c#define CMD_READL_SHX0x06/* SHX device: IIC1* PB6 - SCL* PB7 - SDA*/static void IIC_gpioConfig(void)GPIO_InitTypeDef GPIO_InitStructure;/* 使能與I2C1 有關(guān)的時(shí)鐘*/RCC_APB2PeriphClo

3、ckCmd(RCC_APB2Periph_GPIOB,E NABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,EN ABLE);/* 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;/ 開漏輸出GPIO_Init(GPIOB, &GPIO_Init

4、Structure);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; /* setting master address. */I2

5、C_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 */I2C_Init(I2C1, &I2C_InitStructure);I2C_Cmd(I2C1, ENABLE);void S

6、HT3X_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 START condition */* Test on EV5 and clear it */while(!I2C_CheckEvent(I2C1

7、,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_TRANSMITTER_MODE_SELECT ED);/* Clear EV6 by setting again the PE bit */ I2C_Cmd(I2

8、C1, 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 write to */ I2C_SendData(I2C1, CMD_READL_SHX);/* Test on EV8 and clear it */ while(!I2C_

9、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_SELECT);/* Send shx address for read */I2C_Send7bitAddress(I2C1, (SHT3X_ADDRESS1) | 0x01), I2C

10、_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)/* Disable Acknowledgement */I2C_AcknowledgeConfig(I2C1,DISABLE);/* Send STOP Condition */I2C_GenerateST

11、OP(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 location where the byte read will be saved */pBuffer+;/* Decrement the read bytes counter */NumByteToRead-;/* En

12、able Acknowledgement to be ready for another reception */I2C_AcknowledgeConfig(I2C1, ENABLE);/-static float SHT3X_CalcTemperature(uint16_t rawValue)/ calculate temperature C/ T = -45 + 175 * rawValue / (216-1)return 175.0f * (float)rawValue / 65535.0f - 45.0f;/-static float SHT3X_CalcHumidity(uint16

13、_t rawValue)/ calculate relative humidity %RH/ RH = rawValue / (216-1) * 100return 100.0f * (float)rawValue / 65535.0f;void sht3x_testTask(void)uint8_t recBuffer6;uint16_t 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: %0.1frn, fTemp, fHumi); exitCriticalSection();點(diǎn)擊 (此處 )折疊或打開#ifndef_DEV_SHT3X_H#define _DEV_SHT3X_H#include b