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Re: STACK SIZE要如何才能超過 0x100
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版主
 
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請參考C18 User's Guide 3.2.4 章節的說明:
MPLAB C18 supports stack sizes greater than 256 bytes. The default linker scripts allocate one memory region per bank of memory, so to allocate a stack larger than 256 bytes requires combining two or more memory regions, as the stack section cannot cross memory region boundaries. For example, the default linker script for the PIC18C452 contains the definitions: DATABANK NAME=gpr4 START=0x400 END=0x4ff DATABANK NAME=gpr5 START=0x500 END=0x5ff ... STACK SIZE=0x100 RAM=gpr5 To allocate a 512 byte stack in banks 4 and 5, these definitions should be replaced with: DATABANK NAME=stackregion START=0x400 END=0x5ff PROTECTED STACK SIZE=0x200 RAM=stackregion If a stack larger than 256 bytes is used, the -ls option must be given to the compiler. There is a slight performance penalty that is incurred when using a large stack, as both bytes of the Frame Pointer (FSR2L and FSR2H) must be incremented/decremented when doing a push/pop, rather than just the low-byte.
發表於: 2006/11/13 11:01
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STACK SIZE要如何才能超過 0x100
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新會員
 
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請問版主：
我使用18F4550 須將stack 闊展到384 將 .lkr 內容相關部份修改為如下 DATABANK NAME=pgr2 START=0x200 END=0x3F3 STACK SIZE=0x180 RAM=pgr2 可是執行時發現還是在 256 範圍內 超過的部份從 0x200 開始覆蓋\r 請問修改部份有錯嗎 STACK SIZE要如何才能超過 0x100 thanks!!
發表於: 2006/11/10 21:11
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