stm32f030 模拟IIC

#define read_SDA (GPIOA->IDR&GPIO_Pin_10) >>10 //PA10 SDA
#define set_SDA GPIO_SetBits(GPIOA, GPIO_Pin_10) //PA10 SDA
#define clr_SDA GPIO_ResetBits(GPIOA, GPIO_Pin_10) //PA10 SDA
#define set_SCL GPIO_SetBits(GPIOA, GPIO_Pin_9) //PA9 SCL
#define clr_SCL GPIO_ResetBits(GPIOA, GPIO_Pin_9) //PA9 SCL

/*******************************************************************************
** IO¿ÚÅäÖÃ
*******************************************************************************/
void IO_Confing(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4;//Òý½ÅÑ¡Ôñ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//Êä³öģʽ
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³öģʽ
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//´øÉÏÀ­µç×è
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;//Êä³öËÙ¶È
GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯ÅäÖÃ

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;//
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_9|GPIO_Pin_10);

}
/*******************************************************************************
** SDA¿ÚÅäÖÃ
*******************************************************************************/
void SDA_MODE_IN(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//Òý½ÅÑ¡Ôñ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//ÊäÈëģʽ
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯ÅäÖÃ
}
void SDA_MODE_OUT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//Òý½ÅÑ¡Ôñ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//Êä³öģʽ
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;//
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//²»´øÉÏÀ­µç×è
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;//Êä³öËÙ¶È
GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯ÅäÖÃ
}

//*******************************************************************
// Æð¶¯×ÜÏߺ¯Êý
//º¯ÊýÔ­ÐÍ: void Start_I2c();
//¹¦ÄÜ: Æô¶¯I2C×ÜÏß,¼´·¢ËÍI2CÆðʼÌõ¼þ.
//*******************************************************************
void Start_I2c(void)
{
SDA_MODE_OUT();
clr_SDA; //·¢ËÍÆðʼÐźÅ
delay_us(2); //ÑÓʱ2us
clr_SCL; //ǯסI2C×ÜÏߣ¬×¼±¸·¢ËÍ»ò½ÓÊÕÊý¾Ý
delay_us(2); //ÑÓʱ2us
}
//*******************************************************************
// ½áÊø×ÜÏߺ¯Êý
//º¯ÊýÔ­ÐÍ: void Stop_I2c();
//¹¦ÄÜ: ½áÊøI2C×ÜÏß,¼´·¢ËÍI2C½áÊøÌõ¼þ.
//*******************************************************************
void Stop_I2c(void)
{
SDA_MODE_OUT();
clr_SDA; //·¢ËÍÆðʼÐźÅ
delay_us(2); //ÑÓʱ2us
set_SCL;
delay_us(2); //ÑÓʱ2us
set_SDA; //·¢ËÍI2C×ÜÏß½áÊøÐźÅ
delay_us(5); //ÑÓʱ5us
}
//********************************************************************
// Ó¦´ð×Óº¯Êý
//º¯ÊýÔ­ÐÍ: void Ack_I2c(bit a);
//¹¦ÄÜ: Ö÷¿ØÆ÷½øÐÐÓ¦´ðÐźÅ(¿ÉÒÔÊÇÓ¦´ð»ò·ÇÓ¦´ðÐźţ¬ÓÉλ²ÎÊýa¾ö¶¨)
//********************************************************************
void Ack_I2c(u8 a) //Ó¦´ð»òÕß²»Ó¦´ð SDA=0Ó¦´ð£¬SDA=1·ÇÓ¦´ð
{
SDA_MODE_OUT();
clr_SCL; //ÇåʱÖÓÏߣ¬Ç¯×¡I2C×ÜÏßÒÔ±ã¼ÌÐø½ÓÊÕ
delay_us(2); //ÑÓʱ2us
if(a==0)
clr_SDA; //ÔÚ´Ë·¢³öÓ¦´ð»ò·ÇÓ¦´ðÐźÅ
else
set_SDA;
delay_us(2); //ÑÓʱ2us
set_SCL;
delay_us(2); //ÑÓʱ2us
clr_SCL; //ÇåʱÖÓÏߣ¬Ç¯×¡I2C×ÜÏßÒÔ±ã¼ÌÐø½ÓÊÕ
delay_us(2); //ÑÓʱ2us
clr_SDA; //·¢ËͽáÊøÌõ¼þµÄÊý¾ÝÐźÅ
delay_us(2); //ÑÓʱ2us
}
//*******************************************************************
// ×Ö½ÚÊý¾Ý·¢Ëͺ¯Êý
//¹¦ÄÜ: ½«Êý¾Ýc·¢ËͳöÈ¥,¿ÉÒÔÊǵØÖ·,Ò²¿ÉÒÔÊÇÊý¾Ý,·¢ÍêºóµÈ´ýÓ¦´ð,²¢¶Ô
// ´Ë״̬λ½øÐвÙ×÷.(²»Ó¦´ð»ò·ÇÓ¦´ð¶¼Ê¹ack=0)
// ·¢ËÍÊý¾ÝÕý³££¬ack=1; ack=0±íʾ±»¿ØÆ÷ÎÞÓ¦´ð»òË𻵡£
//*******************************************************************
void SendByte(unsigned char dat)
{
unsigned char BitCnt;
for(BitCnt=0;BitCnt<8;BitCnt++) //Òª´«Ë͵ÄÊý¾Ý³¤¶ÈΪ8λ
{
if((dat<<BitCnt)&0x80)
set_SDA; //ÅжϷ¢ËÍλ
else
clr_SDA;

delay_us(2); //ÑÓʱ2us
set_SCL; //ÖÃʱÖÓÏßΪ¸ß£¬Í¨Öª±»¿ØÆ÷¿ªÊ¼½ÓÊÕÊý¾Ýλ
delay_us(2); //ÑÓʱ3us
clr_SCL;
delay_us(2); //ÑÓʱ1us
}
SDA_MODE_IN();
set_SCL;
delay_us(2); //ÑÓʱ2us
if(read_SDA==1)
ack=0;
else
ack=1; //ÅжÏÊÇ·ñ½ÓÊÕµ½Ó¦´ðÐźÅ
clr_SCL;
delay_us(2); //ÑÓʱ2us
SDA_MODE_OUT();
delay_us(2); //ÑÓʱ2us
clr_SDA;
}

//*******************************************************************
// ×Ö½ÚÊý¾Ý½ÓÊÕº¯Êý
//º¯ÊýÔ­ÐÍ: UCHAR RcvByte();
//¹¦ÄÜ: ÓÃÀ´½ÓÊÕ´ÓÆ÷¼þ´«À´µÄÊý¾Ý,²¢ÅжÏ×ÜÏß´íÎó(²»·¢Ó¦´ðÐźÅ)£¬
// ·¢ÍêºóÇëÓÃÓ¦´ðº¯ÊýÓ¦´ð´Ó»ú¡£
//*******************************************************************
unsigned char RcvByte(void)
{
unsigned char retc=0;
unsigned char BitCnt;
SDA_MODE_IN();
delay_us(1);
for(BitCnt=0;BitCnt<8;BitCnt++)
{
clr_SCL; //ÖÃʱÖÓÏßΪµÍ£¬×¼±¸½ÓÊÕÊý¾Ýλ
delay_us(2); //ÑÓʱ5us
set_SCL; //ÖÃʱÖÓÏßΪ¸ßʹÊý¾ÝÏßÉÏÊý¾ÝÓÐЧ
delay_us(2); //ÑÓʱ2us
retc=retc<<1;
if(read_SDA==1)
retc=retc+1; //¶ÁÊý¾Ýλ,½ÓÊÕµÄÊý¾Ýλ·ÅÈëretcÖÐ
delay_us(2); //ÑÓʱ2us
}
clr_SCL;
delay_us(2); //ÑÓʱ2us
return(retc);
}
//*******************************************************************
// ÏòÓÐ×ÓµØÖ·Æ÷¼þ¶ÁÈ¡¶à×Ö½ÚÊý¾Ýº¯Êý
//º¯ÊýÔ­ÐÍ: bit RecndStr(UCHAR sla,UCHAR suba,ucahr *s,UCHAR no);
//¹¦ÄÜ: ´ÓÆô¶¯×ÜÏßµ½·¢Ë͵ØÖ·£¬×ÓµØÖ·,¶ÁÊý¾Ý£¬½áÊø×ÜÏßµÄÈ«¹ý³Ì,´ÓÆ÷¼þ
// µØÖ·sla£¬×ÓµØÖ·suba£¬¶Á³öµÄÄÚÈÝ·ÅÈësÖ¸ÏòµÄ´æ´¢Çø£¬¶Áno¸ö×Ö½Ú¡£
// Èç¹û·µ»Ø1±íʾ²Ù×÷³É¹¦£¬·ñÔò²Ù×÷ÓÐÎó¡£
//×¢Ò⣺ ʹÓÃÇ°±ØÐëÒѽáÊø×ÜÏß¡£
//********************************************************************
u8 IRcvStr(unsigned char sla,unsigned char *s,unsigned char no)
{
unsigned char i;

Start_I2c(); //Æô¶¯×ÜÏß
SendByte(sla); //·¢ËÍÆ÷¼þµØÖ·
if(ack==0)//ÎÞÓ¦´ð
{
Stop_I2c();
return 0;
}
for(i=0;i<no-1;i++)
{
*s=RcvByte(); //
Ack_I2c(0); //½ÓÊվʹðλ
s++;
}
*s=RcvByte();
Ack_I2c(1); //·¢ËÍ·ÇӦλ
Stop_I2c(); //½áÊø×ÜÏß
return 1;
}