volatile 源代码

volatile是一个特征修饰符(typespecifier).volatile的作用是作为指令关键字,确保本条指令不会因编译器的优化而省略,且要求每次直接读值。

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/************************************************************************************ FILENAME: SEED-DEC2407.h ****************…

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/************************************************************************************ FILENAME: SEED-DEC2407.h ****************…

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/************************************************************************************ FILENAME: SEED-DEC2407.h ****************…

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/************************************************************************************ FILENAME: SEED-DEC2407.h ****************…

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/* WOTCH DOG register */ #define WTCON (*(volatile unsigned long *)0x53000000) /* SDRAM regisers */ #define MEM_CTL_BASE 0x…

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#define GPBCON (*(volatile unsigned long *)0x56000010) #define GPBDAT (*(volatile unsigned long *)0x56000014) int main(…

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#define GPBCON (*(volatile unsigned long *)0x56000010) #define GPBDAT (*(volatile unsigned long *)0x56000014) int main(…

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/* * Copyright 2005 by Spectrum Digital Incorporated. * All rights reserved. Property of Spectrum Digital Incorporated. * …

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/* * Copyright 2005 by Spectrum Digital Incorporated. * All rights reserved. Property of Spectrum Digital Incorporated. * …

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/* * Copyright 2005 by Spectrum Digital Incorporated. * All rights reserved. Property of Spectrum Digital Incorporated. * …