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Re: c30語法,,asm volatile
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管理員
 
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你好,
在 asm 後面加上 volatile 的目的和在變數宣告時加上 vilatile 是很相似的 ! 如果不希望 C30 在最佳化的過程將你自行加入的組合與言刪除或合併 . 那就須要加上它了 . 一般會自行加入嵌入式組語指令在 C 程式中都因為特定目的. 所以應該不想被最佳化程序更動才對 ! 所以加上的話比較好啦 :) Regards,
發表於: 2007/1/12 11:48
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c30語法,,asm volatile
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中級會員
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請教各位大哥:
unsigned int temp_count; void Delay( unsigned int delay_count ) { temp_count = delay_count +1; asm volatile("outer: dec _temp_count"); asm volatile("cp0 _temp_count"); asm volatile("bra z, done"); asm volatile("do #3200, inner" ); asm volatile("nop"); asm volatile("inner: nop"); asm volatile("bra outer"); asm volatile("done:"); } 程式段中的 asm volatile 是什麼意思啊?? 感謝!!
發表於: 2007/1/11 15:05
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