QG4 FLASH

jannicem

以下的是对FLASH操作，当我单步执行时，能正确读写FLASH，当我全速度执行时，PC却走到了0X100出去，为什么呢？在unsigned char ROM_PGM(unsigned int address,unsigned char data,unsigned char cmd) 有一个指针，    (*((volatile unsigned char *)(address))) = data;//write to somewhere in flash  ，当我删了，程序可执行，问题就出在这里，请高手指点帮我讲解下，谢谢

 
#define FLASH_CMD_BYTEPROG 0x20
#define FLASH_CMD_PAGEERASE 0x40
void  pagehandle()
{
  flash_page_erase(0xf800);
  flash_byte_prog(0xf800,0x55);
  flash_byte_prog(0xf801,0xaa);
  flash_byte_prog(0xf802,0xa5); 
  tab[0] = flash_byte_read(0xf800);
  tab[1] = flash_byte_read(0xf801);
  tab[2] = flash_byte_read(0xf802);
}
unsigned char ROM_PGM(unsigned int address,unsigned char data,unsigned char cmd)
  {
   
    __RESET_WATCHDOG();
    DisableInterrupts;    
    if (FSTAT&0x10)
      {                     //Check to see if FACCERR is set
        FSTAT = FSTAT|0x10;            //write a 1 to FACCERR to clear
      }   
    (*((volatile unsigned char *)(address))) = data;//write to somewhere in flash   
    FCMD = cmd;   
    FSTAT = FSTAT|0x80;                //Put FCBEF at 1.
    asm  nop
    asm  nop
    asm  nop
    asm  nop
    if(FSTAT&0x30)
     {                     //check to see if FACCERR or FVIOL are set
      EnableInterrupts;
      return (0xFF);                         //if so, error.
     }    
     while ((FSTAT&0x40)==0);    
     EnableInterrupts;
     return(0);    
  }   

void flash_byte_prog(unsigned int addr, unsigned char data)
{
  //FCMD = 0X20;
  ROM_PGM(addr,data,FLASH_CMD_BYTEPROG);
}
static  void flash_page_erase(unsigned int addr)
{
  //FCMD = 0X40;
  ROM_PGM(addr,0,FLASH_CMD_PAGEERASE);
}
static unsigned char flash_byte_read(unsigned int addr)
{
  return *(unsigned char *)addr;
}

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mickeytest-1827

做读/写FLASH操作时,FLASH时钟要调低,大约在175KHZ左右.

jannicem

我用的是166.7K，不是时钟问题

安

要先写命令，后写入数据。如果先写入数据就进入死循环了。所以你不能操作。