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EEPW首頁(yè) > 嵌入式系統 > 設計應用 > 按鍵開(kāi)關(guān)消抖程序

按鍵開(kāi)關(guān)消抖程序

作者: 時(shí)間:2016-11-25 來(lái)源:網(wǎng)絡(luò ) 收藏
實(shí)踐中,單片機端口在連接開(kāi)關(guān)器件時(shí)都要考慮消抖的問(wèn)題,或在硬件上增加延遲,或是增加軟件延遲查詢(xún)的功能模塊。這里,我們考慮這樣一個(gè)檢測電路:單片機連接一個(gè)開(kāi)關(guān)和兩個(gè)LED。程序是這樣的,如果開(kāi)關(guān)的消抖正確,就點(diǎn)亮LED1,否則就閃亮LED2。按下開(kāi)關(guān),點(diǎn)亮LED1,釋放開(kāi)關(guān),LED1即熄滅。我們加入20毫秒的消抖延遲時(shí)間。當檢測到開(kāi)關(guān)為低電平時(shí),單片機在延遲20毫秒后再次檢測開(kāi)關(guān)的狀態(tài)。如果此時(shí)開(kāi)關(guān)狀態(tài)為高,則LED2就閃亮,如為低則點(diǎn)亮LED1。

源代碼:

本文引用地址:http://dyxdggzs.com/article/201611/321250.htm

led1bitP2.0
led2bitP2.1
switch1bitP1.0
ORG 0000h
setb switch1//initialize switch 1 as input
setb led1//Turn OFF LED1
setb led2//Turn OFF LED2

wait:
jb switch1,wait// Wait till switch1 has been pressed
call debounce_delay
jb switch1,c1_wait
//switch low even after debouncing period
//switch has been succesfully debounced
clr led1//Turn ON LED1
jnb switch1,$//wait till switch has been released
setb led1//Turn OFF LED1
ajmp wait

c1_wait:
//Switch PIN high after debounce period so error in debouncing
cpl led2
ajmp wait

debounce_delay://Subroutine for generating 20ms delay
mov r7,#245
l1_debounce_delay:
mov r6,#40
djnz r6,$
djnz r7,l1_debounce_delay
ret

END




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