DSP5402之倒塌的"数组"访问

2万 · 2008-5-16 20:51

#define FLASH(x)  (*((volatile unsigned char *) 0x8000 + x))
/*----------------------------------------------------------
另类的"数组"访问，外扩的SST39VF800A从0x8000开始
void FlashObj::ChipErase(void)
{
  FLASH(0x5555) = 0xaa;
  FLASH(0x2AAA) = 0x55;
  FLASH(0x5555) = 0x80;
  FLASH(0x5555) = 0xaa;
  FLASH(0x2AAA) = 0x55;
  FLASH(0x5555) = 0x10;
  Wait(0x5555);
}
void FlashObj::Wait(unsigned int address)
{
unsigned int temp, val;
  do {
    val = FLASH(address);
    __nop();
    temp = FLASH(address);
    __nop();
  }
  while(((val ^ temp) & (1 << BIT6)) != 0);
}
----------------------------------------------------------*/

2万 · 2008-5-18 07:32

simon21ic 发表于 2008-5-17 22:21 侃单片机 ←返回版面   举报该贴

所以讨论一个没人用的写法没意义啊

映像中途只有看到过一次&a的用法
#define sizeof(a)  ((char*)(&(a)+1) - (char*)&(a))

顺便提一下32楼的宏：
#define FLASH(x)  (*((volatile unsigned char *) 0x8000 + x))
最好写成
#define FLASH(x)  (*((volatile unsigned char *) 0x8000 + (x)))

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DSP5402之倒塌的"数组"访问

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非常感谢simon21ic对宏bug的纠错!!!!