[精品]按键实验指导书.doc

精品按键实验指导书 按健实验实验一按下一个健，红色LED亮，绿色灭，按下另一个键，红色LED灭，绿色亮 一、新建项目key_1.prj，加入以下模块文件key_1.asm;定义变量g_KeyValue EQU34H b_PressKey BIT00H b_KeyValid BIT01H;定义代码段org0000H Reset:ljmp Mainorg0050H Main:lcall InitSystemMainLoop:lcall ScanKeylcall ReleaseKeylcall ControlKeyjmp MainLoop;子程序-InitSystem:clr b_PressKey clr b_KeyValid retScanKey:jnb b_PressKey,Ke0;若键已按下，则无需扫描ret Ke0:mov A,#03H orlP3,A mov A,P3anl A,#03H cjnea,#03H,Ke2Ke1:clr b_PressKey retKe2:lcall Delay_1ms mov a,P3anl a,#03H cjnea,#03H,Ke3sjmp Ke1Ke3:mov g_KeyValue,a setb b_PressKey setbb_KeyValid ret;-ReleaseKey:jb b_PressKey,RK1ret RK1:mov a,P3anl a,#03H cjnea,#03H,RK2clr b_PressKey;键释放RK2:ret;-ControlKey:jb b_KeyValid,CK1ret CK1:mov a,g_KeyValue cjnea,#01H,CK2clr p3.2setb p3.3sjmp CK3CK2:clr p3.3setb p3.2CK3:clr b_KeyValid ret;-Delay_1ms:mov r7,#200D_1ms1:nop djnzr7,D_1ms1ret END 二、编译，全速运行 三、按下一个健，看其显示如何变化，再按另一个健，看其显示如何变化 四、分析此程序如何实现按健功能 五、修改源程序，原来红色亮健改成绿色亮健，原来绿色亮健改成红色亮健实验二按下一个健，数码管显示增加一；按下另一个健，数码管显示减少 一一、新建项目key_1.prj，加入以下模块文件key_2.asm;定义变量g_DisplayBuff_1EQU30H g_DisplayBuff_2EQU31H g_Counter EQU32H g_KeyValue EQU34H b_PressKey BIT00H b_KeyValid BIT01H;定义代码段org0000H Reset:ljmp Mainorg0050H Main:lcall InitSystemMainLoop:lcall ScanKeylcall ReleaseKeylcall ControlKeylcall DisplayCounterjmp MainLoop;子程序-InitSystem:mov g_Counter,#50clr b_PressKey clr b_KeyValid retScanKey:jb b_PressKey,Ke1mov A,#03H orlP3,A movA,P3anl A,#03H cjnea,#03H,Ke2Ke0:clr b_PressKey Ke1:mov g_KeyValue,#0FFH retKe2:lcall Delay_1ms mov a,P3anl a,#03H cjnea,#03H,Ke3sjmp Ke0Ke3:mov g_KeyValue,a setbb_PressKey setbb_KeyValid ret;-ReleaseKey:jb b_PressKey,RK1ret RK1:mov a,P3anl a,#03H cjnea,#03H,RK2clr b_PressKey RK2:ret;-ControlKey:jb b_KeyValid,CK1ret CK1:mov a,g_KeyValue cjnea,#01H,CK2dec g_Counter sjmp CK3CK2:inc g_Counter CK3:clr b_KeyValid ret;-DisplayCounter:mov a,g_Counter movb,#10div abmov g_DisplayBuff_1,a mov g_DisplayBuff_2,b lcallDisplay ret;-Display:mov dptr,#charOnLED mov a,g_DisplayBuff_1movc a,a+dptr movp1,a setbp1.7lcall Delay_1ms movp1,#0FFH lcall Delay_1ms mova,g_DisplayBuff_2movc a,a+dptr movp1,a clrp1.7lcall Delay_1ms movp1,#7FH lcall Delay_1ms ret;-Delay_1ms:mov r7,#200D_1ms1:nop djnzr7,D_1ms1ret;-;-定义数据段-charOnLED:DB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H DB80H,90H,88h,83h,0C6H,0A1H,86H,8EH END 二、编译，全速运行 三、按下一个健，看其显示如何变化，再按另一个健，看其显示如何变化 四、分析此程序如何实现按健功能 五、修改源程序，原来增一健变成减一健，原来减一健变成增一健 六、将此程序用编程器写入89C51后放入系统中运行实验三一个健为On健，当按下此健时数码管每隔1秒显示1，另一个健为Off健，当按下此健时数码管停止加1显示 一、新建项目key_2.prj，加入以下模块文件key_3.asm;定义变量g_DisplayBuff_1EQU30H g_DisplayBuff_2EQU31H g_Counter EQU32H g_KeyValue EQU34H g_Timer_1s EQU35H b_PressKey BIT00H b_KeyValid BIT01H b_IncCounter BIT02H;定义代码段org0000H Reset:ljmp Mainorg0050H Main:lcall InitSystemMainLoop:lcall ScanKeylcall ReleaseKeylcall ControlKeylcall DisplayCounterlcall IncCounterjmp MainLoop;子程序-InitSystem:mov g_Counter,#00clr b_PressKey clr b_KeyValid clr b_IncCounter retScanKey:jb b_PressKey,Ke1movA,#03H orlP3,A movA,P3anl A,#03H cjnea,#03H,Ke2Ke0:clrb_PressKey Ke1:mov g_KeyValue,#0FFH retKe2:lcall Delay_1ms mova,P3anl a,#03H cjnea,#03H,Ke3sjmp Ke0Ke3:mov g_KeyValue,a setbb_PressKey setbb_KeyValid ret;-ReleaseKey:jb b_PressKey,RK1ret RK1:mova,P3anl a,#03H cjnea,#03H,RK2clrb_PressKey RK2:ret;-ControlKey:jb b_KeyValid,CK1ret CK1:mova,g_KeyValue cjnea,#01H,CK2setbb_IncCounter mov g_Timer_1s,#255sjmpCK3CK2:clrb_IncCounter CK3:clrb_KeyValid ret;-IncCounter:jb b_IncCounter,IC1ret IC1:dec g_Timer_1s mova,g_Timer_1s jnzIC2mov g_Timer_1s,#255inc g_Counter mova,g_Counter cjnea,#100,IC2movg_Counter,#0IC2:ret;-DisplayCounter:mova,g_Counter movb,#10div abmovg_DisplayBuff_1,a movg_DisplayBuff_2,b lcallDisplay ret;-Display:mov dptr,#charOnLED mova,g_DisplayBuff_1movc a,a+dptr movp1,a setbp1.7lcallDelay_1ms mova,g_DisplayBuff_2movc a,a+dptr movp1,a clrp1.7lcallDelay_1ms ret;-Delay_1ms:mov r7,#200D_1ms1:nop nopnop djnzr7,D_1ms1ret;-;-定义数据段-charOnLED:DB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H DB80H,90H,88h,83h,0C6H,0A1H