STM32 模拟 I2C

不多说了，直接上代码，注释都成这样了

/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:void IIC_Init(void)*¹¦¡¡¡¡ÄÜ:³õʼ»¯I2C¶ÔÓ¦µÄ½Ó¿ÚÒý½Å¡£*******************************************************************************/void IIC_Init(void){  GPIO_InitTypeDef GPIO_InitStructure;  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //ʹÄÜPB¶Ë¿ÚʱÖÓ  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9;//¶Ë¿ÚÅäÖà  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;      //ÍÆÍìÊä³öGPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;     //50M  GPIO_Init(GPIOB, &GPIO_InitStructure);      //¸ù¾ÝÉ趨²ÎÊý³õʼ»¯GPIO }int IIC_Start(void){SDA_OUT();     //sdaÏßÊä³öIIC_SDA=1;if(!READ_SDA)return 0;IIC_SCL=1;delay_us(1); IIC_SDA=0;//START:when CLK is high,DATA change form high to low if(READ_SDA)return 0;delay_us(1);IIC_SCL=0;//ǯסI2C×ÜÏߣ¬×¼±¸·¢ËÍ»ò½ÓÊÕÊý¾Ý return 1;}  void IIC_Stop(void){SDA_OUT();//sdaÏßÊä³öIIC_SCL=0;IIC_SDA=0;//STOP:when CLK is high DATA change form low to high delay_us(1);IIC_SCL=1; IIC_SDA=1;//·¢ËÍI2C×ÜÏß½áÊøÐźÅdelay_us(1);   }int IIC_Wait_Ack(void)//µÈ´ýÓ¦´ð{u8 ucErrTime=0;SDA_IN();      //SDAÉèÖÃΪÊäÈë  IIC_SDA=1;delay_us(1);   IIC_SCL=1;delay_us(1); while(READ_SDA){ucErrTime++;if(ucErrTime>50){IIC_Stop();return 0;}  delay_us(1);}IIC_SCL=0;//ʱÖÓÊä³ö0    return 1;  } void IIC_Ack(void) //²úÉúÓ¦´ð{IIC_SCL=0;SDA_OUT();IIC_SDA=0;delay_us(1);IIC_SCL=1;delay_us(1);IIC_SCL=0;}  void IIC_NAck(void)// ²úÉúNACKÓ¦´ð{IIC_SCL=0;SDA_OUT();IIC_SDA=1;delay_us(1);IIC_SCL=1;delay_us(1);IIC_SCL=0;}  void IIC_Send_Byte(u8 txd)// IIC·¢ËÍÒ»¸ö×Ö½Ú{                            u8 t;   SDA_OUT();         IIC_SCL=0;//À­µÍʱÖÓ¿ªÊ¼Êý¾Ý´«Êä    for(t=0;t<8;t++)    {                      IIC_SDA=(txd&0x80)>>7;        txd<<=1;   delay_us(1);   IIC_SCL=1;delay_us(1); IIC_SCL=0;delay_us(1);    } }    int i2cWrite(uint8_t addr, uint8_t reg, uint8_t len, uint8_t *data){int i;    if (!IIC_Start())        return 1;    IIC_Send_Byte(addr << 1 );    if (!IIC_Wait_Ack()) {        IIC_Stop();        return 1;    }    IIC_Send_Byte(reg);    IIC_Wait_Ack();for (i = 0; i < len; i++) {        IIC_Send_Byte(data[i]);        if (!IIC_Wait_Ack()) {            IIC_Stop();            return 0;        }    }    IIC_Stop();    return 0;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:bool i2cWrite(uint8_t addr, uint8_t reg, uint8_t data)*¹¦¡¡¡¡ÄÜ:*******************************************************************************/int i2cRead(uint8_t addr, uint8_t reg, uint8_t len, uint8_t *buf){    if (!IIC_Start())        return 1;    IIC_Send_Byte(addr << 1);    if (!IIC_Wait_Ack()) {        IIC_Stop();        return 1;    }    IIC_Send_Byte(reg);    IIC_Wait_Ack();    IIC_Start();    IIC_Send_Byte((addr << 1)+1);    IIC_Wait_Ack();    while (len) {        if (len == 1)            *buf = IIC_Read_Byte(0);        else            *buf = IIC_Read_Byte(1);        buf++;        len--;    }    IIC_Stop();    return 0;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IIC_Read_Byte(unsigned char ack)*¹¦¡¡¡¡ÄÜ:    //¶Á1¸ö×Ö½Ú£¬ack=1ʱ£¬·¢ËÍACK£¬ack=0£¬·¢ËÍnACK *******************************************************************************/  u8 IIC_Read_Byte(unsigned char ack){unsigned char i,receive=0;SDA_IN();//SDAÉèÖÃΪÊäÈë    for(i=0;i<8;i++ ){        IIC_SCL=0;         delay_us(2);IIC_SCL=1;        receive<<=1;        if(READ_SDA)receive++;   delay_us(2);     }     if (ack)        IIC_Ack(); //·¢ËÍACK     else        IIC_NAck();//·¢ËÍnACK      return receive;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:unsigned char I2C_ReadOneByte(unsigned char I2C_Addr,unsigned char addr)*¹¦¡¡¡¡ÄÜ:    ¶ÁÈ¡Ö¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷µÄÒ»¸öÖµÊäÈëI2C_Addr  Ä¿±êÉ豸µØÖ·addr   ¼Ä´æÆ÷µØÖ··µ»Ø   ¶Á³öÀ´µÄÖµ*******************************************************************************/ unsigned char I2C_ReadOneByte(unsigned char I2C_Addr,unsigned char addr){unsigned char res=0;IIC_Start();IIC_Send_Byte(I2C_Addr);   //·¢ËÍдÃüÁîres++;IIC_Wait_Ack();IIC_Send_Byte(addr); res++;  //·¢Ë͵ØÖ·IIC_Wait_Ack();  //IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þIIC_Start();IIC_Send_Byte(I2C_Addr+1); res++;          //½øÈë½ÓÊÕģʽ   IIC_Wait_Ack();res=IIC_Read_Byte(0);       IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þreturn res;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IICreadBytes(u8 dev, u8 reg, u8 length, u8 *data)*¹¦¡¡¡¡ÄÜ:    ¶ÁÈ¡Ö¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷µÄ length¸öÖµÊäÈëdev  Ä¿±êÉ豸µØÖ·reg  ¼Ä´æÆ÷µØÖ·length Òª¶ÁµÄ×Ö½ÚÊý*data  ¶Á³öµÄÊý¾Ý½«Òª´æ·ÅµÄÖ¸Õë·µ»Ø   ¶Á³öÀ´µÄ×Ö½ÚÊýÁ¿*******************************************************************************/ u8 IICreadBytes(u8 dev, u8 reg, u8 length, u8 *data){    u8 count = 0;IIC_Start();IIC_Send_Byte(dev);   //·¢ËÍдÃüÁîIIC_Wait_Ack();IIC_Send_Byte(reg);   //·¢Ë͵ØÖ·    IIC_Wait_Ack();  IIC_Start();IIC_Send_Byte(dev+1);  //½øÈë½ÓÊÕģʽIIC_Wait_Ack();    for(count=0;count<length;count++){  if(count!=length-1)data[count]=IIC_Read_Byte(1);  //´øACKµÄ¶ÁÊý¾Ý else  data[count]=IIC_Read_Byte(0); //×îºóÒ»¸ö×Ö½ÚNACK}    IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þ    return count;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IICwriteBytes(u8 dev, u8 reg, u8 length, u8* data)*¹¦¡¡¡¡ÄÜ:    ½«¶à¸ö×Ö½ÚдÈëÖ¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷ÊäÈëdev  Ä¿±êÉ豸µØÖ·reg  ¼Ä´æÆ÷µØÖ·length ҪдµÄ×Ö½ÚÊý*data  ½«ÒªÐ´µÄÊý¾ÝµÄÊ×µØÖ··µ»Ø   ·µ»ØÊÇ·ñ³É¹¦*******************************************************************************/ u8 IICwriteBytes(u8 dev, u8 reg, u8 length, u8* data){   u8 count = 0;IIC_Start();IIC_Send_Byte(dev);   //·¢ËÍдÃüÁîIIC_Wait_Ack();IIC_Send_Byte(reg);   //·¢Ë͵ØÖ·    IIC_Wait_Ack();  for(count=0;count<length;count++){IIC_Send_Byte(data[count]); IIC_Wait_Ack();  }IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þ    return 1; //status == 0;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IICreadByte(u8 dev, u8 reg, u8 *data)*¹¦¡¡¡¡ÄÜ:    ¶ÁÈ¡Ö¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷µÄÒ»¸öÖµÊäÈëdev  Ä¿±êÉ豸µØÖ·reg   ¼Ä´æÆ÷µØÖ·*data  ¶Á³öµÄÊý¾Ý½«Òª´æ·ÅµÄµØÖ··µ»Ø   1*******************************************************************************/ u8 IICreadByte(u8 dev, u8 reg, u8 *data){*data=I2C_ReadOneByte(dev, reg);    return 1;}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:unsigned char IICwriteByte(unsigned char dev, unsigned char reg, unsigned char data)*¹¦¡¡¡¡ÄÜ:    дÈëÖ¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷Ò»¸ö×Ö½ÚÊäÈëdev  Ä¿±êÉ豸µØÖ·reg   ¼Ä´æÆ÷µØÖ·data  ½«ÒªÐ´ÈëµÄ×Ö½Ú·µ»Ø   1*******************************************************************************/ unsigned char IICwriteByte(unsigned char dev, unsigned char reg, unsigned char data){    return IICwriteBytes(dev, reg, 1, &data);}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IICwriteBits(u8 dev,u8 reg,u8 bitStart,u8 length,u8 data)*¹¦¡¡¡¡ÄÜ:    ¶Á ÐÞ¸Ä Ð´ Ö¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷Ò»¸ö×Ö½Ú ÖеĶà¸öλÊäÈëdev  Ä¿±êÉ豸µØÖ·reg   ¼Ä´æÆ÷µØÖ·bitStart  Ä¿±ê×Ö½ÚµÄÆðʼλlength   볤¶Èdata    ´æ·Å¸Ä±äÄ¿±ê×Ö½ÚλµÄÖµ·µ»Ø   ³É¹¦ Ϊ1  ʧ°ÜΪ0*******************************************************************************/ u8 IICwriteBits(u8 dev,u8 reg,u8 bitStart,u8 length,u8 data){    u8 b;    if (IICreadByte(dev, reg, &b) != 0) {        u8 mask = (0xFF << (bitStart + 1)) | 0xFF >> ((8 - bitStart) + length - 1);        data <<= (8 - length);        data >>= (7 - bitStart);        b &= mask;        b |= data;        return IICwriteByte(dev, reg, b);    } else {        return 0;    }}/**************************ʵÏÖº¯Êý*********************************************º¯ÊýÔ­ÐÍ:u8 IICwriteBit(u8 dev, u8 reg, u8 bitNum, u8 data)*¹¦¡¡¡¡ÄÜ:    ¶Á ÐÞ¸Ä Ð´ Ö¸¶¨É豸 Ö¸¶¨¼Ä´æÆ÷Ò»¸ö×Ö½Ú ÖеÄ1¸öλÊäÈëdev  Ä¿±êÉ豸µØÖ·reg   ¼Ä´æÆ÷µØÖ·bitNum  ÒªÐÞ¸ÄÄ¿±ê×Ö½ÚµÄbitNumλdata  Ϊ0 ʱ£¬Ä¿±ê뽫±»Çå0 ·ñÔò½«±»ÖÃλ·µ»Ø   ³É¹¦ Ϊ1  ʧ°ÜΪ0*******************************************************************************/ u8 IICwriteBit(u8 dev, u8 reg, u8 bitNum, u8 data){    u8 b;    IICreadByte(dev, reg, &b);    b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));    return IICwriteByte(dev, reg, b);}

//IO¿Ú²Ù×÷ºê¶¨Òå#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) #define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) #define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum))  //IO¿ÚµØÖ·Ó³Éä#define GPIOA_ODR_Addr    (GPIOA_BASE+12) //0x4001080C #define GPIOB_ODR_Addr    (GPIOB_BASE+12) //0x40010C0C #define GPIOC_ODR_Addr    (GPIOC_BASE+12) //0x4001100C #define GPIOD_ODR_Addr    (GPIOD_BASE+12) //0x4001140C #define GPIOE_ODR_Addr    (GPIOE_BASE+12) //0x4001180C #define GPIOF_ODR_Addr    (GPIOF_BASE+12) //0x40011A0C    #define GPIOG_ODR_Addr    (GPIOG_BASE+12) //0x40011E0C    #define GPIOA_IDR_Addr    (GPIOA_BASE+8) //0x40010808 #define GPIOB_IDR_Addr    (GPIOB_BASE+8) //0x40010C08 #define GPIOC_IDR_Addr    (GPIOC_BASE+8) //0x40011008 #define GPIOD_IDR_Addr    (GPIOD_BASE+8) //0x40011408 #define GPIOE_IDR_Addr    (GPIOE_BASE+8) //0x40011808 #define GPIOF_IDR_Addr    (GPIOF_BASE+8) //0x40011A08 #define GPIOG_IDR_Addr    (GPIOG_BASE+8) //0x40011E08 #define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)  //Êä³ö #define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)  //ÊäÈë #define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)  //Êä³ö #define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)  //ÊäÈë #define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)  //Êä³ö #define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)  //ÊäÈë //IO·½ÏòÉèÖÃ#define SDA_IN()  {GPIOB->CRH&=0XFFFFFF0F;GPIOB->CRH|=8<<4;}#define SDA_OUT() {GPIOB->CRH&=0XFFFFFF0F;GPIOB->CRH|=3<<4;}//IO²Ù×÷º¯Êý #define IIC_SCL    PBout(8) //SCL#define IIC_SDA    PBout(9) //SDA #define READ_SDA   PBin(9)  //ÊäÈëSDA