关于STM8l读取AT24C512的数读取错误

只看该作者 · 2015-8-4 09:57

在使用STM8L与EEPROM芯片AT24C512通信的时候，出现了一点问题
因为STM8和STM32的库函数相似，所以参考了野火教程里EEPROM的代码，修改移植到STM8L上

STM8L_I2C.zip (2.69 KB)

读函数
void EEPROM_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t NumByteToRead)
{

/*!< While the bus is busy */
while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
/*!< Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/*!< Test on EV5 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/*!< Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, 0xa0, I2C_Direction_Transmitter);
/*!< Test on EV6 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_Cmd(I2C1, ENABLE);
I2C_SendData(I2C1, ReadAddr);
/*!< Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/*!< Send STRAT condition a second time */
I2C_GenerateSTART(I2C1, ENABLE);
/*!< Test on EV5 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/*!< Send EEPROM address for read */
I2C_Send7bitAddress(I2C1, 0xa0, I2C_Direction_Receiver);
/*!< Test on EV6 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

/* While there is data to be read */
while (NumByteToRead)
{
      if (NumByteToRead == 1)
      {
         /* Disable Acknowledgement */
         I2C_AcknowledgeConfig(I2C1, DISABLE);

         /* Send STOP Condition */
         I2C_GenerateSTOP(I2C1, ENABLE);
      }
      /* Test on EV7 and clear it */
      if (I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
      {
         /* Read a byte from the EEPROM */
         *pBuffer = I2C_ReceiveData(I2C1);
         /* Point to the next location where the byte read will be
         68 saved */
         pBuffer++;
         /* Decrement the read bytes counter */
         NumByteToRead--;
      }
}
I2C_AcknowledgeConfig(I2C1, ENABLE);
}

写函数
void EEPROM_WriteBuffer(uint8_t* pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
{
uint8_t NumOfPage = 0, NumOfSingle = 0, count = 0;
uint16_t Addr = 0;

Addr = WriteAddr % I2C_PageSize;
count = (uint8_t)(I2C_PageSize - (uint16_t)Addr);
NumOfPage =  (uint8_t)(NumByteToWrite / I2C_PageSize);
NumOfSingle = (uint8_t)(NumByteToWrite % I2C_PageSize);

if (Addr == 0)
{
      if (NumOfPage == 0)
      {
      EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)NumOfSingle);
      EEPROM_WaitEepromStandbyState();
   }
else
{
      while (NumOfPage--)
      {
         EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)I2C_PageSize);
         EEPROM_WaitEepromStandbyState();
         WriteAddr +=  I2C_PageSize;
         pBuffer += I2C_PageSize;
      }

      if (NumOfSingle != 0)
      {
         EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)NumOfSingle);
         EEPROM_WaitEepromStandbyState();
      }
   }
}
  else
  {
if (NumOfPage == 0)
{
      EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)NumOfSingle);
      EEPROM_WaitEepromStandbyState();
}
else
{
      NumByteToWrite -= count;
      NumOfPage = (uint8_t)(NumByteToWrite / I2C_PageSize);
      NumOfSingle = (uint8_t)(NumByteToWrite % I2C_PageSize);

      if (count != 0)
      {
         EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)count);
         EEPROM_WaitEepromStandbyState();
         WriteAddr += count;
         pBuffer += count;
      }

      while (NumOfPage--)
      {
         EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)I2C_PageSize);
         EEPROM_WaitEepromStandbyState();
         WriteAddr +=  I2C_PageSize;
         pBuffer += I2C_PageSize;
      }
      if (NumOfSingle != 0)
      {
         EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)NumOfSingle);
         EEPROM_WaitEepromStandbyState();
      }
}
  }
}

写页函数

void EEPROM_WritePage(uint8_t* pBuffer, uint16_t WriteAddr, uint8_t* NumByteToWrite)
{
   while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
   /*!< Send START condition */
   I2C_GenerateSTART(I2C1, ENABLE);
   /*!< Test on EV5 and clear it */
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
   /*!< Send EEPROM address for write */
   I2C_Send7bitAddress(I2C1, 0xA0, I2C_Direction_Transmitter);
   /*!< Test on EV6 and clear it */
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

   I2C_SendData(I2C1, WriteAddr);
   /*!< Test on EV8 and clear it */
   while (! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

   while (NumByteToWrite--)
   {
      /* Send the current byte */
      I2C_SendData(I2C1, *pBuffer);
      /* Point to the next byte to be written */
      pBuffer++;
      /* Test on EV8 and clear it */
      while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
   }
   /*!< Send STOP condition */
   I2C_GenerateSTOP(I2C1, ENABLE);

}

测试函数
void EEPROM_Test()
{
uint16_t i = 0;

for(i = 0; i < 5; i++)
{
      printf("The Write Data is %d\n", test_Write);
}

EEPROM_WriteBuffer(test_Write, EEPROM_Firstpage, 5);
printf("Write success!\r\n");
delay_ms(50);
printf("Read Data\r\n");
delay_ms(10);
EEPROM_ReadBuffer(test_Read, 0x01, 5);
delay_ms(10);
for(i = 0; i < 5; i++)
{
      printf("The Read Data is %d\n", test_Read);
}

}

但是出现写完成后，读数始终为ff的结果
现在有点迷糊，我该如何判断是写函数出问题还是读函数出问题，或者是都有问题呢？
请各位大大指教