主函数中调用：
Msg_Register(InkeyTest_MsgProc, Msg_Key0,Msg_Key1);//InkeyTest_MsgProc是Msg处理函数
//---------------------------------------------
//消息处理程序的登记
//入口:消息字，函数指针
//开始消息字和结束消息字之间的处理函数指针设置
//---------------------------------------------
void Msg_Register(void(* Function)(), const unsigned char mEnumMin, const unsigned char mEnumMax)
{
unsigned char min=mEnumMin;
unsigned char max=mEnumMax;
unsigned char i;
while(min<=max)
{
sInMsg.aMessage_Function[min++]=Function;
}
}
上面的子函数汇编后是这样的：
void Msg_Register(void(* Function)(), const unsigned char mEnumMin, const unsigned char mEnumMax)
{
3F8427 Msg_Register:
3F8427 FE06 ADDB SP,#6
3F8428 9744 MOV *-SP[4],AH
3F8429 9643 MOV *-SP[3],AL
3F842A A842 MOVL *-SP[2],XAR4
unsigned char min=mEnumMin;
3F842B 9243 MOV AL,*-SP[3]
3F842C 9645 MOV *-SP[5],AL
unsigned char max=mEnumMax;
3F842D 9244 MOV AL,*-SP[4]
3F842E 9646 MOV *-SP[6],AL
unsigned char i;
// for(i=min;i<=max;i++)
while(min<=max)
3F842F 6F0C SB DW$L$_Msg_Register$2$E,UNC
3F843B DW$L$_Msg_Register$2$E:
3F843B 9246 MOV AL,*-SP[6]
3F843C 5445 CMP AL,*-SP[5]
3F843D 67F3 SB DW$L$_Msg_Register$2$B,HIS
{
sInMsg.aMessage_Function[min++]=Function;
3F8430 DW$L$_Msg_Register$2$B:
3F8430 761F MOVW DP,#0x0203
3F8432 9345 MOV AH,*-SP[5]
3F8433 C400 MOVL XAR6,@0
3F8434 0EA8 MOVU ACC,@AH
3F8435 0A45 INC *-SP[5]
3F8436 FF30 LSL ACC,1
3F8437 07A6 ADDL ACC,@XAR6
3F8438 8AA9 MOVL XAR4,@ACC
3F8439 C442 MOVL XAR6,*-SP[2]
3F843A C2C4 MOVL *+XAR4[0],XAR6
}
}
3F843E DW$L$_Msg_Register$3$E:
3F843E FE86 SUBB SP,#6
3F843F 0006 LRETR
//===============================================
当min=3时进入循环体运行到3F843A C2C4 MOVL *+XAR4[0],XAR6处，栈里的min和max就改变了,min成了3f,max 成了838C（3f838c是XAR6寄存器的内容。）也就是将XAR6的数据移到*+XAR4[0]，却改变了min和max的值。
百思不得其解。不知何故？
sInMsg结构体是这样的：
struct InMsg{
void (**aMessage_Function)(); //对应消息字的函数指针数组开始指针
unsigned char *aMsgBufStart; //消息缓冲区开始
unsigned char *aMsgBufEnd; //消息缓冲区结束位置
unsigned char *pMsgIn;
unsigned char *pMsgOut;
unsigned char aReadMsgBuffer[5]; //用户使用的消息信息缓冲区，只读[0]消息字，[1]-[4]为参数
};
struct InMsg sInMsg; |
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