ARM: LPC2000 APPLICATION DOES NOT REACH MAIN

byteman_wang

于 2009-01-12 23:12:00 发布

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分类专栏：编程匠艺文章标签： application compiler struct variables byte

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本文介绍了一种在使用CARM编译器时遇到的问题：声明全局变量导致程序进入DataAbort模式。原因是编译器自动初始化了位于VECTORED INTERRUPT CONTROLLER地址空间内的全局变量，触发了非法字节访问。文中提供了通过编译器指令避免自动初始化的方法。

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SYMPTOM

When I declare following global variable in my application, my program goes into DataAbort mode before it reaches main():

struct vectCntlFields {
  unsigned int source:5 ;
  unsigned int enable:1 ;
};

volatile struct vectCntlFields  vectCntlSlot0   __at 0xFFFFF200;

CAUSE

The CARM compiler automatically initializes global variables. This results in an illegal byte-access to an register of the VIC (VECTORED INTERRUPT CONTROLLER). All registers in the VIC are word registers. Byte and halfword reads and write are not supported.

RESOLUTION

Instruct the compiler not to initialize your variables in the VIC register address space. Your code above should read:

struct vectCntlFields {
  unsigned int source:5 ;
  unsigned int enable:1 ;
};

#pragma SAVE
#pragma NOINIT
volatile struct vectCntlFields  vectCntlSlot0   __at 0xFFFFF200;
#pragma INIT