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 Post subject: global 變數被最佳化
PostPosted: Fri Feb 10, 2012 4:22 pm 
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Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
下面這個code在最佳化之後,程式編譯出來的結果不如預期。

有一個global變數variTest,在interrupt來時會改變。
程式碼:
Attachment:
p1.gif
p1.gif [ 18.93 KiB | Viewed 7188 times ]


其中我標起來的那一行,
只要一開始variTest的bit 3為0就會進入無窮迴圈。

解決方法:
將變數variTest前面加上volatile,就可以如預期中會抓取variTest的值做判斷。
如下:
Attachment:
p2.gif
p2.gif [ 18.96 KiB | Viewed 7187 times ]


程式碼如下:
Attachment:
Hello.zip [45.94 KiB]
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