STM32 模拟 IIC 读取 MPU6050 程序实现.rar

/******************************************************************\ ** 本程序只供学习使用，未经作者许可，不得用于其它任何用途 ** ** ** ** 硬件平台：STM32F407VGT6 ** ** 开发环境：MDK-ARM( 5.14 ) ** ** ** ** 作 者：Brendon Tan ** ** 完成日期：2016.11.30 ** ** ** ** 文件名称：iic.c ** ** 文件说明：模拟 IIC 驱动 ** ** ** ** Copyright(C) 2016-2026,@Brendon_Tan ** \******************************************************************/ /*********************** V1.0 - 2016.11.27 ***********************/ //1.支持发送一个字节数据,接收一个字节数据 //2.支持往多个连续地址发送多个数据 //3.支持从多个连续地址读取多个数据 /*********************** V1.1 - 2016.11.30 ***********************/ //4.支持对设备任一可写寄存器中数据任一位进行修改 //5.支持对设备任一可写寄存器中数据多个位进行修改 /************************* END of Record *************************/ #include "iic.h" /* IIC Init */ void IIC_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(IIC_RCC , ENABLE); //使能 IIC 时钟 GPIO_InitStructure.GPIO_Pin = IIC_SCL_Pin | IIC_SDA_Pin; //IIC对应IO口 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //普通输出模式 GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; //管脚推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //管脚频率2MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //管脚上拉 GPIO_Init(IIC_Port , &GPIO_InitStructure); //初始化IIC GPIO IIC_SCL_H; IIC_SDA_H; } /* IIC Start */ void IIC_Start(void) { IIC_SDA_H; IIC_SCL_H; IIC_delay(); // SDA -- __ __ IIC_SDA_L; IIC_delay(); // SCL -- -- __ IIC_SCL_L; IIC_delay(); } /* IIC Stop */ void IIC_Stop(void) { IIC_SCL_L; IIC_delay(); IIC_SDA_L; IIC_delay(); // SDA __ __ -- IIC_SCL_H; IIC_delay(); // SCL __ -- -- IIC_SDA_H; IIC_delay(); } /* IIC Send Ack */ void IIC_Ack(void) { IIC_SCL_L; IIC_SDA_L; IIC_delay(); IIC_SCL_H; IIC_delay(); // SDA __ __ __ -- IIC_SCL_L; IIC_delay(); // SCL __ -- __ __ IIC_SDA_H; } /* IIC Send NAck */ void IIC_NAck(void) { IIC_SCL_L; IIC_SDA_H; IIC_delay(); // SDA -- -- -- -- IIC_SCL_H; IIC_delay(); // SCL __ -- __ __ IIC_SCL_L; IIC_delay(); IIC_SDA_H; } /* IIC Wait a Ack */ /* return: */ /* ack=1 有应答 */ /* ack=0 无应答 */ unsigned char IIC_Wait_Ack(void) { u8 ucErrTime=0; IIC_SCL_L; IIC_delay(); IIC_SDA_H; IIC_delay(); IIC_SCL_H; IIC_delay(); while(IIC_SDA_READ()) { ucErrTime++; if(ucErrTime > 50) { IIC_Stop(); return 0; } } IIC_SCL_L; IIC_delay(); return 1; } /* IIC Send One Byte */ void IIC_Send_Byte(unsigned char data) { unsigned char i; IIC_SCL_L; IIC_delay(); for(i = 0; i < 8; i++) { if(data & 0x80) { IIC_SDA_H; IIC_delay(); } else { IIC_SDA_L; IIC_delay(); } IIC_SCL_H; IIC_delay(); IIC_SCL_L; IIC_delay(); data <<= 1; if(i == 7) { IIC_delay(); IIC_SDA_H; } } } /* IIC Read One Byte */ /* ack=1 发送Ack */ /* ack=0 发送NAck */ unsigned char IIC_Read_Byte(unsigned char ack) { unsigned char i; unsigned char data=0; for(i = 0; i < 8; i++) { data <<= 1; IIC_SCL_L; IIC_delay(); IIC_SCL_H; IIC_delay(); if(IIC_SDA_READ()) { data |=0x01; } } IIC_SCL_L; if(ack == 0) { IIC_NAck(); } else { IIC_Ack(); } return data; } /* A simple IIC delay */ static void IIC_delay(void) { unsigned char i; for(i = 0; i < 20; i++); //i>10,才能保证通讯时序 } /* Write One Data to Register */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* reg_data: 发送的数据 */ unsigned char IIC_Write_Data(unsigned char slaveaddr, unsigned char reg_addr, unsigned char reg_data) { IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_WR); if(IIC_Wait_Ack() == 0) { IIC_Stop(); return 1; } IIC_Send_Byte(reg_addr); IIC_Wait_Ack(); IIC_Send_Byte(reg_data); IIC_Wait_Ack(); IIC_Stop(); return 0; } /* Write n Data to Register */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* num: 数据数量 */ /* reg_data: 发送的数据 */ unsigned char IIC_Write_nData(unsigned char slaveaddr, unsigned char reg_addr, unsigned int num, unsigned char *buf) { IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_WR); if(IIC_Wait_Ack() == 0) { IIC_Stop(); return 1; } IIC_Send_Byte(reg_addr); IIC_Wait_Ack(); while(num--) { IIC_Send_Byte(*buf); IIC_Wait_Ack(); buf++; } IIC_Stop(); return 0; } /* Read One Data from Register */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* *reg_data: 接收的数据地址 */ unsigned char IIC_Read_Data(unsigned char slaveaddr, unsigned char reg_addr, unsigned char *reg_data) { IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_WR); if( IIC_Wait_Ack() == 0 ) { IIC_Stop(); return 1; } IIC_Send_Byte(reg_addr); IIC_Wait_Ack(); IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_RD); IIC_Wait_Ack(); *reg_data = IIC_Read_Byte(0); IIC_Stop(); return 0; } /* Read n Data from Register */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* num: 数据数量 */ /* *buf: 接收的数据地址 */ unsigned char IIC_Read_nData(unsigned char slaveaddr, unsigned char reg_addr, unsigned int num, unsigned char *buf) { // unsigned int i=0; IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_WR); if( IIC_Wait_Ack() == 0 ) { IIC_Stop(); return 1; } IIC_Send_Byte(reg_addr); IIC_Wait_Ack(); IIC_Start(); IIC_Send_Byte(slaveaddr << 1 | IIC_RD); IIC_Wait_Ack(); while(num) { if(num == 1) { *buf = IIC_Read_Byte(0); } else { *buf = IIC_Read_Byte(1); } buf ++; num --; } // for(i = 0; i < (num -1); i++) // { // *buf = IIC_Read_Byte(1); // buf++; // } // *buf = IIC_Read_Byte(0); IIC_Stop(); return 0; } /* Write One Bit Data to REG Data */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* bit_num: 位的序号(第几位) */ /* bit_data: 位的数据(位的状态) */ void IIC_Write_Bit(unsigned char slaveaddr, unsigned char reg_addr, unsigned int bit_num, unsigned char bit_data) { unsigned char b; IIC_Read_Data(slaveaddr, reg_addr, &b); b=(bit_data != 0) ? (b | (1 << bit_num)) : (b & ~(1 << bit_num)); IIC_Write_Data(slaveaddr, reg_addr, b); } /* Write len Bit Data to REG Data */ /* slaveaddr: 器件地址 */ /* reg_addr: 寄存器地址 */ /* bit_start: 开始位的序号(第几位)*/ /* len: 修改位的个数 */ /* bit_data: 位的数据(位的状态) */ void IIC_Write_nBit(unsigned char slaveaddr, unsigned char reg_addr ,unsigned char bit_start,unsigned int len, unsigned char bit_data) { unsigned char b,temp; IIC_Read_Data(slaveaddr, reg_addr, &b); temp= (0xFF << (bit_start + 1)) | 0xFF >> ((8 - bit_start) + len -1); bit_data <<= (8 - len); bit_data >>= (7 - bit_start); b &=temp; b |=bit_data; IIC_Write_Data(slaveaddr, reg_addr, b); } /************************ END of the File *************************/