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一、映射表在串口数据解析中的应用1、数据结构typedef struct { char CMD[CMDLen]; unsigned char (*cmd_operate)(char *data);}Usart_Tab;2、指令、函数映射表static const Usart_Tab InstructionList[CMDMax]={ {"PWON",PowOn}, {"PWOFF",PowOff}, {"HDCP",HdcpOnOff}, {"/V",QueryKaVersion}, {"EDIDUpgrade",UpdataEDID}, {"Psave",Psave}, {"Precall",Precall}, {"Pclear",Pclear},};3、串口解析函数实现unsigned char DataAnalysis(char *buf){ unsigned char i,Result; char *NEXT=NULL; for(i=0;i<CMDMax;i++) { NEXT=StrCmp(buf,(char*)InstructionList.CMD); if(NEXT!=NULL) { usartfuncp=InstructionList.cmd_operate; Result=(*usartfuncp)(NEXT); } } return Result;}二、映射表在UI设计中的应用1、数据结构 菜单枚举： typedef enum{ stage1=0, stage2, stage3, stage4, stage5, stage6, stage7, stage8, stage9,}SCENE;数据结构： typedef struct { void (*current_operate)(); //当前场景的处理函数 SCENE Index; //当前场景的标签 SCENE Up; //按下Up键跳转的场景 SCENE Down; //按下Down键跳转的场景 SCENE Right; //按下Left键跳转的场景 SCENE Left; //按下Right键跳转的场景}STAGE_TAB;2、函数映射表STAGE_TAB stage_tab[]={ #. operate Index Up Down Left Right {Stage1_Handler, stage1, stage4, stage7, stage3, stage2}, {Stage2_Handler, stage2, stage5, stage8, stage1, stage3}, {Stage3_Handler, stage3, stage6, stage9, stage2, stage1}, {Stage4_Handler, stage4, stage7, stage1, stage6, stage5}, {Stage5_Handler, stage5, stage8, stage2, stage4, stage6}, {Stage6_Handler, stage6, stage9, stage3, stage5, stage4}, {Stage7_Handler, stage7, stage1, stage4, stage9, stage8}, {Stage8_Handler, stage8, stage2, stage5, stage7, stage9}, {Stage9_Handler, stage9, stage3, stage6, stage8, stage7},};3、定义两个变量保存当前场景和上一个场景char current_stage=stage1;char prev_stage=current_stage;4、按下Up按键 跳转到指定场景current_stage的值根据映射表改变current_stage =stage_tab[current_stage].Up;5、场景改变后 根据映射表执行相应的函数Handlerif(current_stage!=prev_stage){ stage_tab[current_stage].current_operate(); prev_stage=current_stage;}
来源：物联网IoT技术 |
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