STM32F407 模拟IIC 驱动24c128 无法读写-lui515520的回答

STM32F407 模拟IIC 驱动24c128 无法读写

2019-07-20 14:05发布

站内问答 / STM32/STM8

2478 9

我用的是STM32f4 探索者开发板， 24c02 能正常读写，换了24c128 ，不能正常读写，每次读出来的数据都是255；
程序如下：大神帮我分析一下程序哪里有问题，我监测每次的应答消息都能正确！

u8 okflag = 0;

#define SDA_IN()  {GPIOB->MODER&=~(3<<(9*2));GPIOB->MODER|=0<<9*2;}    //PB9êäèëÄ￡ê½
#define SDA_OUT() {GPIOB->MODER&=~(3<<(9*2));GPIOB->MODER|=1<<9*2;}  //PB9êä3öÄ￡ê½

#define IIC_SCL PBout(8) //SCL
#define IIC_SDA PBout(9) //SDA
#define READ_SDA PBin(9)  //êäèëSDA

void IIC_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//ê1ÄüGPIOBê±Öó

  //GPIOB8,B93õê¼»ˉéèÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//ÆÕí¨êä3öÄ￡ê½
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//íÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//éÏà-
  GPIO_Init(GPIOB, &GPIO_InitStructure);//3õê¼»ˉ
IIC_SCL=1;
IIC_SDA=1;
}

void IIC_Start(void)
{
SDA_OUT();    //sdaÏßêä3ö
IIC_SDA=1;
IIC_SCL=1;
delay_us(4);
IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC_SCL=0;//Çˉ×¡I2C×üÏß￡¬×¼±¸·￠Ëí»ò½óêÕêy¾Y
}
//2úéúIICí￡Ö1DÅoÅ
void IIC_Stop(void)
{
SDA_OUT();//sdaÏßêä3ö
IIC_SCL=0;
IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL=1;
IIC_SDA=1;//·￠ËíI2C×üÏß½áêøDÅoÅ
delay_us(4);
}

u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN();
IIC_SDA=1;delay_us(1);
IIC_SCL=1;delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL=0;
return 0;
}

void IIC_Ack(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=0;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//2»2úéúACKó|′e
void IIC_NAck(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=1;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}

void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL=0;//à-μíê±Öó¿aê¼êy¾Y′«êä
for(t=0;t<8;t++)
{
      IIC_SDA=(txd&0x80)>>7;
      txd<<=1;
delay_us(2); //¶ÔTEA5767Õaèy¸öÑóê±¶¼êÇ±ØDëμÄ
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
delay_us(2);
}
}
//¶á1¸ö×Ö½ú￡¬ack=1ê±￡¬·￠ËíACK￡¬ack=0￡¬·￠ËínACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDAéèÖÃÎaêäèë
for(i=0;i<8;i++ )
{
      IIC_SCL=0;
      delay_us(2);
IIC_SCL=1;
      receive<<=1;
      if(READ_SDA)receive++;
delay_us(1);
}
if (!ack)
      IIC_NAck();//·￠ËínACK
else
      IIC_Ack(); //·￠ËíACK
return receive;
}

//3õê¼»ˉIIC½ó¿ú
void AT24CXX_Init(void)
{
IIC_Init();//IIC3õê¼»ˉ
}
//ÔúAT24CXXÖ¸¶¨μØÖ·¶á3öò»¸öêy¾Y
//ReadAddr:¿aê¼¶áêyμÄμØÖ·
//·μ»ØÖμ  :¶áμ½μÄêy¾Y
u8 AT24CXX_ReadOneByte(u16 ReadAddr)
{
u8 temp=0;
IIC_Start();

IIC_Send_Byte(0XA0);    //·￠ËíD′Ãüáî
IIC_Wait_Ack();//1

IIC_Send_Byte(ReadAddr>>8);//·￠Ëí¸ßμØÖ·
IIC_Wait_Ack();

IIC_Send_Byte(ReadAddr%256); //·￠ËíμíμØÖ·
IIC_Wait_Ack();    //2
// if(!IIC_Wait_Ack())
// {
// okflag = 12;
// }
// else
// {
// okflag = 47;
// }
IIC_Start();
IIC_Send_Byte(0XA1);          //½øèë½óêÕÄ￡ê½
IIC_Wait_Ack();

temp=IIC_Read_Byte(0);
IIC_Stop();//2úéúò»¸öí￡Ö1ìõ¼t
return temp;
}

u8 AT24C128ReadOneByte(void) //test
{
u8 temp=0;
IIC_Start();

IIC_Send_Byte(0XA0);    //·￠ËíD′Ãüáî
IIC_Wait_Ack();//1

IIC_Send_Byte(0);//·￠Ëí¸ßμØÖ·
IIC_Wait_Ack();

IIC_Send_Byte(0); //·￠ËíμíμØÖ·
IIC_Wait_Ack();    //2

IIC_Start();
IIC_Send_Byte(0XA1);          //½øèë½óêÕÄ￡ê½
//IIC_Wait_Ack();
if(!IIC_Wait_Ack())
okflag = 20;
else
okflag=55;
temp=IIC_Read_Byte(0);
IIC_Stop();//2úéúò»¸öí￡Ö1ìõ¼t
return temp;
}
void AT24C128WriteOneByte(u8 DataToWrite) //test
{
  IIC_Start();

IIC_Send_Byte(0XA0);             //·￠ËíD′Ãüáî
IIC_Wait_Ack(); // 1

IIC_Send_Byte(0); //·￠Ëí¸ßμØÖ·
IIC_Wait_Ack(); // 2

  IIC_Send_Byte(0); //·￠ËíμíμØÖ·
IIC_Wait_Ack(); //3

IIC_Send_Byte(DataToWrite);    //·￠Ëí×Ö½ú

if(!IIC_Wait_Ack()) okflag=10;
else okflag=33;//4)okflag

  IIC_Stop();                   //2úéúò»¸öí￡Ö1ìõ¼t
delay_ms(10);
}
//ÔúAT24CXXÖ¸¶¨μØÖ·D′èëò»¸öêy¾Y
//WriteAddr

′èëêy¾YμÄÄ¿μÄμØÖ·
//DataToWrite:òaD′èëμÄêy¾Y
void AT24CXX_WriteOneByte(u16 WriteAddr,u8 DataToWrite)
{
  IIC_Start();

IIC_Send_Byte(0XA0);             //·￠ËíD′Ãüáî
IIC_Wait_Ack(); // 1

IIC_Send_Byte(WriteAddr/0x0100); //·￠Ëí¸ßμØÖ·
IIC_Wait_Ack(); // 2

  IIC_Send_Byte(WriteAddr%256); //·￠ËíμíμØÖ·
IIC_Wait_Ack(); //3

IIC_Send_Byte(DataToWrite);    //·￠Ëí×Ö½ú
IIC_Wait_Ack();       //4

  IIC_Stop();                   //2úéúò»¸öí￡Ö1ìõ¼t
delay_ms(10);
}
//ÔúAT24CXXàïÃæμÄÖ¸¶¨μØÖ·¿aê¼D′èë3¤¶èÎaLenμÄêy¾Y
//¸ÃoˉêyóÃóúD′èë16bit»òÕß32bitμÄêy¾Y.
//WriteAddr  :¿aê¼D′èëμÄμØÖ·
//DataToWrite:êy¾Yêy×éê×μØÖ·
//Len       :òaD′èëêy¾YμÄ3¤¶è2,4
void AT24CXX_WriteLenByte(u16 WriteAddr,u32 DataToWrite,u8 Len)
{
u8 t;
for(t=0;t<Len;t++)
{
AT24CXX_WriteOneByte(WriteAddr+t,(DataToWrite>>(8*t))&0xff);
}
}

//ÔúAT24CXXàïÃæμÄÖ¸¶¨μØÖ·¿aê¼¶á3ö3¤¶èÎaLenμÄêy¾Y
//¸ÃoˉêyóÃóú¶á3ö16bit»òÕß32bitμÄêy¾Y.
//ReadAddr :¿aê¼¶á3öμÄμØÖ·
//·μ»ØÖμ    :êy¾Y
//Len       :òa¶á3öêy¾YμÄ3¤¶è2,4
u32 AT24CXX_ReadLenByte(u16 ReadAddr,u8 Len)
{
u8 t;
u32 temp=0;
for(t=0;t<Len;t++)
{
temp<<=8;
temp+=AT24CXX_ReadOneByte(ReadAddr+Len-t-1);
}
return temp;
}
//¼ì2éAT24CXXêÇ·ñÕy3￡
//ÕaàïóÃáË24XXμÄ×îoóò»¸öμØÖ·(255)à′′æ′￠±êÖ¾×Ö.
//èç1ûóÃÆäËû24CÏμáD,Õa¸öμØÖ·òaDT¸Ä
//·μ»Ø1:¼ì2aê§°ü
//·μ»Ø0:¼ì2a3é1|
u8 AT24CXX_Check(void)
{
u8 temp;
temp=AT24CXX_ReadOneByte(16383);//±üÃaÃ¿′Î¿a»ú¶¼D′AT24CXX
if(temp==0X55)return 0;
else//ÅÅ3yμúò»′Î3õê¼»ˉμÄÇé¿ö
{
AT24CXX_WriteOneByte(16383,0X55);
      temp=AT24CXX_ReadOneByte(16383);
if(temp==0X55)return 0;
}
return 1;
}

//ÔúAT24CXXàïÃæμÄÖ¸¶¨μØÖ·¿aê¼¶á3öÖ¸¶¨¸öêyμÄêy¾Y
//ReadAddr :¿aê¼¶á3öμÄμØÖ· ¶Ô24c02Îa0~255
//pBuffer  :êy¾Yêy×éê×μØÖ·
//NumToRead:òa¶á3öêy¾YμÄ¸öêy
void AT24CXX_Read(u16 ReadAddr,u8 *pBuffer,u16 NumToRead)
{
while(NumToRead)
{
*pBuffer++=AT24CXX_ReadOneByte(ReadAddr++);
NumToRead--;
}
}
//ÔúAT24CXXàïÃæμÄÖ¸¶¨μØÖ·¿aê¼D′èëÖ¸¶¨¸öêyμÄêy¾Y
//WriteAddr :¿aê¼D′èëμÄμØÖ· ¶Ô24c02Îa0~255
//pBuffer :êy¾Yêy×éê×μØÖ·
//NumToWrite:òaD′èëêy¾YμÄ¸öêy
void AT24CXX_Write(u16 WriteAddr,u8 *pBuffer,u16 NumToWrite)
{
while(NumToWrite--)
{
AT24CXX_WriteOneByte(WriteAddr,*pBuffer);
WriteAddr++;
pBuffer++;
}
}

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9条回答

2019-07-20 20:38

单个字节读书我是用着两个函数，不知道有没有问题，IIC_Wait_Ack();能正常应答
u8 AT24CXX_ReadOneByte(u16 ReadAddr)
{
u8 temp=0;
IIC_Start();

IIC_Send_Byte(0XA0);    //·￠ËíD′Ãüáî
IIC_Wait_Ack();//1

IIC_Send_Byte(ReadAddr>>8);//·￠Ëí¸ßμØÖ·
IIC_Wait_Ack();

IIC_Send_Byte(ReadAddr%256); //·￠ËíμíμØÖ·
IIC_Wait_Ack();    //2

IIC_Start();
IIC_Send_Byte(0XA1);          //½øèë½óêÕÄ￡ê½
IIC_Wait_Ack();

temp=IIC_Read_Byte(0);
IIC_Stop();//2úéúò»¸öí￡Ö1ìõ¼t
return temp;
}

u8 AT24C128ReadOneByte(void) //test
{
u8 temp=0;
IIC_Start();

IIC_Send_Byte(0XA0);    //·￠ËíD′Ãüáî
IIC_Wait_Ack();//1

IIC_Send_Byte(0);//·￠Ëí¸ßμØÖ·
IIC_Wait_Ack();

IIC_Send_Byte(0); //·￠ËíμíμØÖ·
IIC_Wait_Ack();    //2

IIC_Start();
IIC_Send_Byte(0XA1);          //½øèë½óêÕÄ￡ê½
IIC_Wait_Ack();
temp=IIC_Read_Byte(0);
IIC_Stop();//2úéúò»¸öí￡Ö1ìõ¼t
return temp;
}

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