TI中文支持网我在进行写操作时，程序一直处在I2caRegs.I2CMDR.bit.STP=1；状态，导致我无法进行写操作，
I2CA_WriteData(struct I2CMSG *msg)
{
int16 i;
while (I2caRegs.I2CMDR.bit.STP == 1)
{
return i_ERROR;
} }
mangui zhang：
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
我在进行写操作时，程序一直处在I2caRegs.I2CMDR.bit.STP=1；状态，导致我无法进行写操作，
I2CA_WriteData(struct I2CMSG *msg)
{
int16 i;
while (I2caRegs.I2CMDR.bit.STP == 1)
{
return i_ERROR;
} }
user3900194：
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;}
我在进行写操作时，程序一直处在I2caRegs.I2CMDR.bit.STP=1；状态，导致我无法进行写操作，
I2CA_WriteData(struct I2CMSG *msg)
{
int16 i;
while (I2caRegs.I2CMDR.bit.STP == 1)
{
return i_ERROR;
} }
rookiecalf：
回复 user3900194:
探索者
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;}
我在进行写操作时，程序一直处在I2caRegs.I2CMDR.bit.STP=1；状态，导致我无法进行写操作，
I2CA_WriteData(struct I2CMSG *msg)
{
int16 i;
while (I2caRegs.I2CMDR.bit.STP == 1)
{
return i_ERROR;
} }
user3900194：
回复 mangui zhang:
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
。。。。。。。。。。。。。。。。。。。
}
我在进行写操作时，程序一直处在I2caRegs.I2CMDR.bit.STP=1；状态，导致我无法进行写操作，
I2CA_WriteData(struct I2CMSG *msg)
{
int16 i;
while (I2caRegs.I2CMDR.bit.STP == 1)
{
return i_ERROR;
} }
user3900194：
回复 rookiecalf:
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
