为什么I2C中SR寄存器的ADDR位一直读不出来

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kaloulin|

楼主 | 2020-3-28 15:04 | 只看该作者回帖奖励

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ADDR, 寄存器, I2c, ST, TE

完全按照例程来的，验证过程中I2C_EE_ByteWrite函数能正确执行，但就是卡在 waitEepromStandbyState函数处，经过断点调试后发现
运行完语句I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);后即使SR1寄存器是0x0482，即ADDR位为1，
往下执行SR1_Tmp = I2C_ReadRegister(EEPROM_I2Cx, I2C_Register_SR1);的时候ADDR会跳变为0，一开始以为是读操作会使ADDR为0，结果
发现读出来的的SR1寄存器的ADDR也位始终为0。把SR1_Tmp = I2C_ReadRegister(EEPROM_I2Cx, I2C_Register_SR1);换成
SR1_Tmp =I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED);或者
SR1_Tmp =I2C_GetFlagStatus (EEPROM_I2C,I2C_FLAG_ADDR);也不行。求各位大神给个解释。

int main(void)
{
      // 程序来到main函数之前，启动文件：statup_stm32f10x_hd.s已经调用
      // SystemInit()函数把系统时钟初始化成72MHZ
      // SystemInit()在system_stm32f10x.c中定义
      // 如果用户想修改系统时钟，可自行编写程序修改
      uint8_t String[20]=&quot;transmit begin\n&quot;;
      uint8_t String1[20]=&quot;transmit complete\n&quot;;
      uint8_t String2[20]=&quot;receive begin\n&quot;;
      uint8_t String3[20]=&quot;receive complete\n&quot;;
  uint8_t aChar=0;
      USART_Config();
  I2C_EEPROM_config();
      USART_SendString(DEBUG_USARTx,String);
      EEPROM_ByteWrite(0x00,'a');
      USART_SendString(DEBUG_USARTx,String1);
  EEPROM_WaitStandbyState();
      USART_SendString(DEBUG_USARTx,String2);
      aChar=EEPROM_ByteRead(0x00);
      USART_SendString(DEBUG_USARTx,String3);
      USART_SendByte(DEBUG_USARTx,aChar);
      while(1)
      {
      }
}

void I2C_EE_WaitEepromStandbyState(void)
{
  vu16 SR1_Tmp = 0;

  do
  {
/* Send START condition */
I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);
      /* Read I2C1 SR1 register */
SR1_Tmp = I2C_ReadRegister(EEPROM_I2Cx, I2C_Register_SR1 & 0x0002));
  }while(！SR1_Tmp);

  /* Clear AF flag */
  I2C_ClearFlag(EEPROM_I2Cx, I2C_FLAG_AF);
/* STOP condition */
I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);
}

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