基于單片機(jī)的多級(jí)菜單實(shí)現(xiàn)方法改進(jìn)

1、1基于單片機(jī)的多級(jí)菜單實(shí)現(xiàn)方法改進(jìn) 基于單片機(jī)的多級(jí)菜單實(shí)現(xiàn)方法改進(jìn)摘 要： 要：介紹了一種在 C 語言環(huán)境下,基于單片機(jī)的多級(jí)菜單實(shí)現(xiàn)方法.該方法從單的功能結(jié)構(gòu)出發(fā),在程序設(shè)計(jì)中做了幾點(diǎn)改進(jìn).首先對(duì)菜單數(shù)據(jù)項(xiàng)和功能函數(shù)各自進(jìn)行獨(dú)立設(shè)計(jì),通過在數(shù)據(jù)結(jié)構(gòu)中增加按鍵有效標(biāo)志、字符串指針、存儲(chǔ)器地址以及與復(fù)用相關(guān)的元素,實(shí)現(xiàn)了兩者源代碼空間的有效分離,從而大大提高了程序的可維護(hù)性;其次引入菜單項(xiàng)復(fù)用的思想,簡(jiǎn)化了程序結(jié)構(gòu).該設(shè)計(jì)的多級(jí)菜單

2、在自動(dòng)售貨機(jī)的服務(wù)模式的實(shí)際應(yīng)用表明,此改進(jìn)方法使菜單設(shè)計(jì)變得更為簡(jiǎn)單方便,軟件通用性更高,維護(hù)更容易.關(guān)鍵詞： 關(guān)鍵詞：?jiǎn)纹瑱C(jī);C 語言;多級(jí)菜單;函數(shù)指針I(yè)mproved method ofmultilevelmenu realization based on SCMAbstract:A new method of designingmultilevelmenus applied in single-chip micro compu

3、ter (SCM)systems byC language is introduced. Taking function structure of menu as a starting point the method made several improvements in software design. Firstly,menu data items andmenu functionwere designed separate

4、ly. Eefficientbreakaway between their codes space was implemented by increasing key-pressed ign, string pointer, memory address and elements correlativewith reuse, and thus themaintainability of oftwarewas enhanced great

5、ly; Secondly, the introduction ofmenu data items reuse made the software tructure simple. A practicalapplication of the designedmenu to servicemode of the vendingmachine in-dicates that the design ofmultilevelmenus by th

6、ismethod ismuch simpler and easier, with higher interconvertibility andmaintainability.Key words:single-chipmicro computer; C language; multilevelmenu; function pointer一、 一、 引言 引言3接在* display-str1/2 的位置處填上用“”括起來的所要顯示的字符串

7、. data-addr 為所設(shè)參數(shù)存放在 EEPROM 中的首地址.當(dāng)此地址發(fā)生改變時(shí),也只須修改初始化表中的相應(yīng)內(nèi)容.此改進(jìn)可以帶來以下好處:1)把菜單項(xiàng)數(shù)據(jù)和菜單項(xiàng)的功能函數(shù)分開大大加強(qiáng)了軟件的可維護(hù)性,整個(gè)菜單項(xiàng)的顯示內(nèi)容和所需設(shè)置的參數(shù)均在初始化表中直觀地體現(xiàn)了出來.如果需要更改某個(gè)菜單項(xiàng)的固定顯示內(nèi)容,則只須在結(jié)構(gòu)數(shù)組的初始化表(以下簡(jiǎn)稱初始化表)中相應(yīng)索引號(hào)對(duì)應(yīng)條目處修改對(duì)應(yīng)字符串的內(nèi)容,而不必去修改菜單項(xiàng)的功能函數(shù).如存儲(chǔ)

8、地址發(fā)生改變時(shí),同樣也只需修改初始化表的相應(yīng)內(nèi)容.2)使復(fù)用功能函數(shù)成為可能.多級(jí)菜單中往往存在許多結(jié)構(gòu)相同而僅僅是所設(shè)參數(shù)不同的情況,例如,實(shí)例中有大量設(shè)置開關(guān)的菜單項(xiàng),不同的僅為第 1 行顯示的主題內(nèi)容和開關(guān)數(shù)據(jù)保存的 EEPROM 地址,如采用傳統(tǒng)方法,則只能分別編寫功能函數(shù).不同之處僅在于初始化表中字符串和存儲(chǔ)器地址相關(guān)的元素取值.利用此改進(jìn)可以使這些菜單項(xiàng)共用一個(gè)功能函數(shù).1·2 采用復(fù)用策略 采用復(fù)用策略考慮存在一