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Re: 請問C30 attribute的問題
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版主
 
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參照：
Maintain data through reset 有些知道的先回: 剛好相反，persistent 是告訴C30的啟動模組不要對 PrevData[5]作任何的清除或初始值的設定動作。一般是作為 Warm Start 的變數區域。 參照： Align begin or end to a multi-byte boundary aligned(32) 是臨界位址的界定，(32)的意思為2的5次方等於32, 也就是說本變數的起始位址必須為 B0~b4 為零的邊界位址開始，如界定 Self-Programming 的 Block start Address. reserve(64) 是保留 64 Bytes 位址給 EndArray 陣列。
發表於: 2007/9/3 10:57
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請問C30 attribute的問題
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新會員
 
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Dear 版主,
想請問一下attribute的問題 ,這是從203剪下來的 //------------------------------------------------------ Place in a specific section or space int Abc __attribute__((section(“ThePlace”))); int Def __attribute__((space(psv))); New section will be created, if needed ThePlace這section要自己這個名稱,但是要在哪裡建立呢? //------------------------------------------------------ Align begin or end to a multi-byte boundary char __attribute__((aligned(32))) MyArray[18]; int __attribute__((reverse(64))) EndArray[25]; 不太懂aligned和reverse的用法, 用watch windows看過這兩個陣列, 看不出哪裡不同? //------------------------------------------------------ Allow linker to fill memory gaps char __attribute__((unordered)) MidArray[15]; Allows linker to move variable unordered是代表這陣列可以移動嗎???? //------------------------------------------------------ Maintain data through reset int __attribute__((persistent)) PrevData[5]; C30 startup code will not initialize to zero Can maintain state information through reset Not for power cycle persistent在這指的是一開始Inital完會把PrevData陣列都清 為0? //------------------------------------------------------ 還有像boot, packed, noload, weak的用法? 感謝您的撥空回答 
發表於: 2007/8/31 23:43
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