STM32用GPIO模拟IIC(I2C)通讯c语言源码-实测可用.docx

#include myiic.h#include delay.hu8 isBMI160=0, isPMU6050 =0;void I2C_delay(void)_NOP();/初始化IICvoid IIC_Init(void) RCC-APB2ENR|=1CRH&=0XFFFF00FF;/PB1/11 推挽输出GPIOB-CRH|=0X00003300; GPIOB-ODR|=3250)IIC_Stop();return 1;IIC_SCL=0;/时钟输出0 return 0; #endif/*/向IIC总线发送一个字节数据/*void IIC_SendByte(u8 dat)#ifdef BMI160 u8 i=8; while(i-) SCL_L; I2C_delay(); if(dat&0x80) SDA_H; else SDA_L; dat=1; I2C_delay();SCL_H; I2C_delay(); SCL_L;#else u8 t; SDA_OUT(); IIC_SCL=0;/拉低时钟开始数据传输 for(t=0;t7; dat=1; Delay_us(I2C_Delayus); /对TEA5767这三个延时都是必须的IIC_SCL=1;Delay_us(I2C_Delayus); IIC_SCL=0;Delay_us(I2C_Delayus); IIC_RecvACK(); #endif /*/从IIC总线接收一个字节数据/*u8 IIC_RecvByte(void)#ifdef BMI160 u8 i=8; u8 ReceiveByte=0; SDA_H; while(i-) ReceiveByte=1; SCL_L; I2C_delay(); SCL_H; I2C_delay(); if(SDA_read) ReceiveByte|=0x01; SCL_L; return ReceiveByte;#else unsigned char i,receive=0;SDA_IN();/SDA设置为输入 for(i=0;i8;i+ ) IIC_SCL=0; Delay_us(I2C_Delayus);IIC_SCL=1; receive7) | SlaveAddress & 0xFFFE);/设置高起始地址+器件地址 if(!IIC_RecvACK()IIC_Stop(); return FALSE; IIC_SendByte(REG_Address ); /设置低起始地址 IIC_RecvACK(); IIC_SendByte(REG_data); IIC_RecvACK(); IIC_Stop(); Delay_ms(5);#else IIC_Start(); /起始信号 IIC_SendByte(SlaveAddress); /发送设备地址+写信号 IIC_SendByte(REG_Address); /内部寄存器地址， IIC_SendByte(REG_data); /内部寄存器数据， IIC_Stop(); /发送停止信号 return 0;#endif/*/从IIC设备读取一个字节数据/*u8 Single_ReadIIC(u8 REG_Address)#ifdef BMI160unsigned char REG_data;/i=A; if(!IIC_Start()/UART1_Put_Char(1);return FALSE; IIC_SendByte(SlaveAddress); /I2C_SendByte(REG_Address & 0x0700) 7) | REG_Address & 0xFFFE);/设置高起始地址+器件地址 if(!IIC_RecvACK()IIC_Stop();return FALSE; IIC_SendByte(u8) REG_Address); /设置低起始地址 IIC_RecvACK(); IIC_Start(); IIC_SendByte(SlaveAddress+1); IIC_RecvACK(); REG_data= IIC_RecvByte(); I2C_NoAck(); IIC_Stop(); /return TRUE;return REG_data;#elseu8 REG_data;IIC_Start(); /起始信号IIC_SendByte(SlaveAddress); /发送设备地址+写信号IIC_SendByte(REG_Address); /发送存储单元地址，从0开始IIC_Start(); /起始信号IIC_SendByte(SlaveAddress+1); /发送设备地址+读信号REG_data=IIC_RecvByte(); /读出寄存器数据IIC_SendACK(); /接收应答信号IIC_Stop(); /停止信号return REG_data;#endif/*-*This is a sample code for read and write the data by using I2C/SPI*Use either I2C or SPI based on your need*Configure the below code to your SPI or I2C driver*-*/ /*Brief: The function is used as I2C bus read *Return : Status of the I2C read *param dev_addr : The device address of the device *param reg_addr : Address of the register *param reg_data : The value of the register *param cnt : The no of data to be read */s8 i2c_bus_read(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)#ifdef BMI160u8 i; / 起始信号IIC_Start();/ 发送设备地址IIC_SendByte(dev_addr); IIC_RecvACK();/发送存储单元地址IIC_SendByte(reg_addr); IIC_RecvACK();/ 起始信号IIC_Start();/发送设备地址+读信号IIC_SendByte(dev_addr+1); IIC_RecvACK();for (i=0; icnt; i+) /连续读取6个地址数据，存储中BUF*(reg_data+i) = IIC_RecvByte(); /BUF0存储数据if (i = cnt-1)I2C_NoAck(); /最后一个数据需要回NOACKelseIIC_SendACK(); /回应ACKIIC_Stop(); /停止信号I2C_delay();return 0;#elses32 ierror = 0;u8 stringpos = 0;IIC_Start(); /起始信号IIC_SendByte(dev_addr); /发送设备地址+写信号IIC_SendByte(reg_addr); /发送存储单元地址，从0开始IIC_Start(); /起始信号IIC_SendByte(dev_addr+1); /发送设备地址+读信号for (stringpos = 0; stringpos cnt; stringpos+)reg_datastringpos=IIC_RecvByte(); /读出寄存器数据IIC_SendACK(); /接收应答信号IIC_Stop(); /停止信号return (s8)ierror;#endif/*Brief: The function is used as I2C bus write *Return : Status of the I2C write *param dev_addr : The device address of the device *param reg_addr : Address of the register *param reg_data : The value of the register *param cnt : The no of data to be read */s8 i2c_bus_write(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)s32 ierror = 0;u8 stringpos = 0; IIC_Start(); /起始信号 IIC_SendByte(dev_addr); /发送设备地址+写信号 IIC_RecvACK(