STM32用GPIO模拟IIC(I2C)通讯c语言源码实测可用

1、#include,myiic.hn#includedelay.hu8isBMI160=0,isPMU6050=0;voidl2C_delay(void)_NOP();初始化lievoidllCJnit(void)RCC-APB2ENR|=13;/先使能外设10PORTB时钟GPIOB-CRH&二OXFFFFOOFF;/PB1/11推挽输出GPIOB-CRH|=0X00003300;GPIOB-ODR|=310;/PB10J1输出高/lie起始信号u8IIC_Start(void)#ifdefBMI160SDA_H;SCL.H;l2C_delay();if(!SDA_read)returnFAL

2、SE;/SDA线为低电平则总线忙，退出SDA_L;l2C_delay();if(SDA_read)returnFALSE;/SDA线为高电平则总线岀错，退出SDA_L;l2C_delay();#elseSDA_OUT();/sda线输出IIC_SDA=1;IIC_SCL=1;Delay_us(l2C_Delayus);IIC_SDA=0;/START:whenCLKishigh,DATAchangeformhightolowDelay_us(l2C_Delayus);IIC_SCL=O;/钳住IIC总线，准备发送或接收数据#endif/lie停止信号voidIIC_Stop(void)#ifd

3、efBMI160SCL.L;l2C_delay();SDA_L;l2C_delay();SCL.H;l2C_delay();SDA_H;l2C_delay();#elseSDA_OUT();/sda线输出IIC_SCL=0;IIC_SDA=0;/STOP:whenCLKishighDATAchangeformlowtohighDelay_us(l2C_Delayus);IIC_SCL=1;IIC_SDA=1;/发送IIC总线结束信号Delay_us(l2C_Delayus);#endif*FunctionName:l2C_NoAckDescriptionInputOutputReturn:Ma

4、sterSendNoAcknowledgeSingle:None:None:None*/voidl2C_NoAck(void)#ifdefBMI160SCL_L;l2C_delay();SDA_H;l2C_delay();SCL_H;l2C_delay();SCL.L;l2C_delay();#elseIIC_SCL=O;l2C_delay();IIC_SDA=1;l2C_delay();IIC_SCL=1;l2C_delay();IIC_SCL=O;l2C_delay();#endif/)K*p*p*p)K*p*p*p*p*p*p)K*4c*4c*p)c*4c*p/lie发送应答信号入【I参

5、数:ack(O:ACKl:NAK)/)K*p*p*p)K*p*p*p*p*p*p)K*4c*4c*p)c*4c*pvoidIIC_SendACK(void)#ifdefBMI160SCL_L;l2C_delay();SDA_L;l2C_delay();SCL.H;l2C_delay();SCL_L;l2C_delay();写应答信号拉高时钟线延时拉低时钟线延时#elseIIC_SDA=1;IIC_SCL=1;Delay_us(5);IIC_SCL=O;Delay_us(5);#endif/)K*p*p*p)K*p*p*p*p*p*p)K*4c*4c*p)c*4c*p/lie接收应答信号/)K*

6、p*p*p)K*p*p*p*p*p*p)K*4c*4c*p)c*4c*pu8IIC_RecvACK(void)#ifdefBMI160SCL_L;l2C_delay();SDA_H;l2C_delay();SCL.H;l2C_delay();if(SDA_read)SCL.L;l2C_delay();returnFALSE;SCL_L;l2C_delay();return0;#elseu8ucErrTime=0;SDAJN();/SDA设置为输入IIC_SDA=l;Delay_us(l2C_Delayus);IIC_SCL=l;Delay_us(l2C_Delayus);while(READ_

7、SDA)ucErrTime+;if(ucErrTime250)IIC_Stop();return1;IIC_SCL=O;时钟输出0return0;#endif向lie总线发送一个字节数据/4c*p*p*p)K*p*p*p*p*p*4c*4c*p)K*4c*)K*p)K*4c*pvoidIIC_SendByte(u8dat)#ifdefBMI160u8i=8;while(i-)SCL.L;l2C_delay();if(dat&0 x80)SDA_H;elseSDA_L;dat=l;l2C_delay();SCL_H;l2C_delay();SCL_L;#elseu81;SDA_OUT();IIC

8、_SCL=O;/拉低时钟开始数据传输for(t=0;t7;dat=l;Delay_us(l2C_Delayus);对TEA5767这三个延时都是必须的IIC_SCL=1;Delay_us(l2C_Delayus);IIC_SCL=O;Delay_us(l2C_Delayus);IIC_RecvACK();#endif从lie总线接收一个字节数据u8IIC_RecvByte(void)#ifdefBMI160u8i=8;u8ReceiveByte=O;SDA_H;while(i-)ReceiveByte=l;SCL.L;l2C_delay();SCL_H;l2C_delay();if(SDA_r

9、ead)ReceiveByte|=0 x01;SCL_L;returnReceiveByte;#elseunsignedcharizreceive=O;SDA_IN();/SDA设置为输入for(i=0;iIIC_Start()/UART：l_Put_Char；returnFALSE;IIC_SendByte(SlaveAddress);/l2C_SendByte(REG_Address&0 x0700)7)|REG_Address&OxFFFE);设置高起始地址+器件地址if(川C_RecvACK()IIC_Stop();returnFALSE;IIC_SendByte(u8)REG_Add

10、ress);设置低起始地址IIC_RecvACK();IIC_Start();IIC_SendByte(SlaveAddress+l);IIC_RecvACK();REG_data=IIC_RecvByte();l2C_NoAck();IIC_Stop();/returnTRUE;returnREG_data;#elseu8REG_data;IIC_Start();IIC_SendByte(SlaveAddress);IIC_SendByte(REG_Address);IIC_Start();IIC_SendByte(SlaveAddress+l);REG_data=IIC_RecvByte(

11、);IIC_SendACK();IIC_Stop();returnREG_data;#endif起始信号发送设备地址+写信号发送存储单元地址，从0开始起始信号发送设备地址+读信号读出寄存器数据接收应答信号停止信号ThisisasamplecodeforreadandwritethedatabyusingI2C/SPIUseeitherI2CorSPIbasedonyourneedConfigurethebelowcodetoyourSPIorI2Cdriver*/*Brief:ThefunctionisusedasI2CbusreadReturn:StatusoftheI2Creadparam

12、dev_addr:Thedeviceaddressofthedeviceparamreg_addr:Addressoftheregisterparamreg_data:Thevalueoftheregisterparament:Thenoofdatatoberead*/s8i2c_bus_read(u8dev_addrzu8reg_addrzu8*reg_data,u8ent)#ifdefBMI160u8i;/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);II

13、C_RecvACK();/起始信号IIC_Start();发送设备地址+读信号IIC_SendByte(dev_addr+l);IIC_RecvACK();连续读取6个地址数据，存储中BUF/BUF0存储数据最后一个数据需要回回应ACK停止信号for(i=0;icnt;i+)*(reg_data+i)=IIC_RecvByte();if(i=cnt-1)l2C_NoAck();NOACKelseIIC_SendACK();IIC_Stop();l2C_delay();return0;#elses32ierror=0;u8stringpos=0;IIC_Start();IIC_SendByte(

14、dev_addr);IIC_SendByte(reg_addr);起始信号发送设备地址+写信号发送存储单元地址，从0开始IIC_Start();IIC_SendByte(dev_addr+l);起始信号发送设备地址+读信号for(stringpos=0;stringposent;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:ThefunctionisusedasI2CbuswriteReturn:StatusoftheI2Cwriteparamdev_addr:Thedeviceaddressofthedeviceparamreg_addr:Addressoftheregisterparamreg_data:Thevalueoftheregisterparament:Thenoofdatatoberead*/s8i2c_bus_write(u8dev_addou8reg_addGu8*reg_data,u8ent)s32ierror=0;u8stringpos=0;IIC