各位大侠，我在学习I2C模块的编程，我对头文件中的一个定义的结构体弄不明白，关键是源程序中的MsgStatus变量包含的各种状态，我实在弄不明白这是什么意思，希望大家指导一下：
结构体为：
struct I2CMSG {
uint16 MsgStatus; // Word stating what state msg is in:
// I2C_MSGCMD_INACTIVE = do not send msg
// I2C_MSGCMD_BUSY = msg start has been sent,
// awaiting stop
// I2C_MSGCMD_SEND_WITHSTOP = command to send
// master trans msg complete with a stop bit
// I2C_MSGCMD_SEND_NOSTOP = command to send
// master trans msg without the stop bit
// I2C_MSGCMD_RESTART = command to send a restart
// as a master receiver with a stop bit
uint16 SlaveAddress; // I2C address of slave msg is intended for
uint16 NumOfBytes; // Num of valid bytes in (or to be put in MsgBuffer)
uint16 MemoryAddr; // RTC address of data associated with msg (low byte)
uint16 MsgBuffer[I2C_MAX_BUFFER_SIZE]; // Array holding msg data - max that
// MAX_BUFFER_SIZE can be is 16 due to
// the FIFO's
};
这些是MsgStatus指向的各种状态变量，到底是跟I2C模块是怎样的关系，我应该在哪查到这些变量，希望大家帮我指导一下：
// I2C Message Commands for I2CMSG struct
#define I2C_MSGSTAT_INACTIVE 0x0000
#define I2C_MSGSTAT_SEND_WITHSTOP 0x0010
#define I2C_MSGSTAT_WRITE_BUSY 0x0011
#define I2C_MSGSTAT_SEND_NOSTOP 0x0020
#define I2C_MSGSTAT_SEND_NOSTOP_BUSY 0x0021
#define I2C_MSGSTAT_RESTART 0x0022
#define I2C_MSGSTAT_READ_BUSY 0x0023
希望大家能帮我解决这个疑惑点，谢谢了！
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