I2C EEPROM

硬件设计有问题吗    IIC上有没有上拉电阻等  

附件是详细指导说明   看看

我再单步调试例子程序时，进行写操作：当运行完I2caRegs.I2CMDR.all = 0x6E20;-----当运行完这一步后，我通过watch window，看，为何I2caRegs.I2CMDR.all = 0x4220？，请看源程序：

Uint16 I2CA_WriteData(struct I2CMSG *msg)
{
   Uint16 i;

   // Wait until the STP bit is cleared from any previous master communication.
   // Clearing of this bit by the module is delayed until after the SCD bit is
   // set. If this bit is not checked prior to initiating a new message, the
   // I2C could get confused.
   if (I2caRegs.I2CMDR.bit.STP == 1)
   {
      return I2C_STP_NOT_READY_ERROR;
   }

   // Setup slave address
   I2caRegs.I2CSAR = msg->SlaveAddress;

   // Check if bus busy
   if (I2caRegs.I2CSTR.bit.BB == 1)
   {
      return I2C_BUS_BUSY_ERROR;
   }

   // Setup number of bytes to send
   // MsgBuffer + Address
   I2caRegs.I2CCNT = msg->NumOfBytes+2;

   // Setup data to send
   I2caRegs.I2CDXR = msg->MemoryHighAddr;
   I2caRegs.I2CDXR = msg->MemoryLowAddr;
// for (i=0; i<msg->NumOfBytes-2; i++)
   for (i=0; i<msg->NumOfBytes; i++)

   {
      I2caRegs.I2CDXR = *(msg->MsgBuffer+i);
   }

   // Send start as master transmitter
   I2caRegs.I2CMDR.all = 0x6E20;-----当运行完这一步后，我通过watch window，看，为何I2caRegs.I2CMDR.all = 0x4220？

   return I2C_SUCCESS;
}

探索者 说：

我再单步调试例子程序时，进行写操作：当运行完I2caRegs.I2CMDR.all = 0x6E20;-----当运行完这一步后，我通过watch window，看，为何I2caRegs.I2CMDR.all = 0x4220？，请看源程序：

Uint16 I2CA_WriteData(struct I2CMSG *msg)
{
   Uint16 i;

   // Wait until the STP bit is cleared from any previous master communication.
   // Clearing of this bit by the module is delayed until after the SCD bit is
   // set. If this bit is not checked prior to initiating a new message, the
   // I2C could get confused.
   if (I2caRegs.I2CMDR.bit.STP == 1)
   {
      return I2C_STP_NOT_READY_ERROR;
   }

   // Setup slave address
   I2caRegs.I2CSAR = msg->SlaveAddress;

   // Check if bus busy
   if (I2caRegs.I2CSTR.bit.BB == 1)
   {
      return I2C_BUS_BUSY_ERROR;
   }

   // Setup number of bytes to send
   // MsgBuffer + Address
   I2caRegs.I2CCNT = msg->NumOfBytes+2;

   // Setup data to send
   I2caRegs.I2CDXR = msg->MemoryHighAddr;
   I2caRegs.I2CDXR = msg->MemoryLowAddr;
// for (i=0; i<msg->NumOfBytes-2; i++)
   for (i=0; i<msg->NumOfBytes; i++)

   {
      I2caRegs.I2CDXR = *(msg->MsgBuffer+i);
   }

   // Send start as master transmitter
   I2caRegs.I2CMDR.all = 0x6E20;-----当运行完这一步后，我通过watch window，看，为何I2caRegs.I2CMDR.all = 0x4220？

   return I2C_SUCCESS;
}

bit13,11置位后自动清零，bit12位为保留位，读取始终为0

硬件加了上拉电阻10k，同样的程序在不同的2808板子上可以，但是在28035上就会I2caRegs.I2CMDR.bit.STP =1，是否等于1软件是无法配置的吧？

Uint16 I2CA_WriteData(struct I2CMSG *msg)
{
   Uint16 i;

   if (I2caRegs.I2CMDR.bit.STP == 1)
   {
      return I2C_STP_NOT_READY_ERROR;
   }

   // Setup slave address

。。。。。。。。。。。。。。。。。。。

}

恩，谢谢，我还发现在ccs中单步调试时 读取数据时 I2caRegs.I2CSTR.bit.ARDY=0；而全速运行模式时 I2caRegs.I2CSTR.bit.ARDY=1，为何有这样的区别啊