savedata.c

系统在运行过程中,出现故障的情况下,需要对一些运行的中间状态参数进行保存,以备系统恢复后继续保持原先状态,这个代码主要就是完成这一功能

extern void autobaud(void);
extern char write_flash_chk (int faddr, char fdata, char fdm);
extern void put_string(char code *string);
#define PAGE_START 0x0400

char xdata* pFlashPage1,*pFlashPage2;
unsigned char pData1,pData2;
unsigned int mData;
#define DATA 1
#include <stdio.h>
main()
{
    autobaud();
	printf("Hello ,World\n");

 	pFlashPage1=(char xdata*)(PAGE_START);
	pData1=(unsigned char)*pFlashPage1;
	pFlashPage2=(char xdata*)(PAGE_START+1);
    pData2=(unsigned char)*pFlashPage2;
	mData=pData1*256+pData2;
    printf("flash write return mData %u\n",mData);


	if(0==write_flash_chk(0x400,(134>>8)&0x0FF,DATA))
	{	  
		if(0==write_flash_chk(0x401,134&0x0FF,DATA))
		{	
  	     	pFlashPage1=(char xdata*)(PAGE_START);
			pData1=(unsigned char)*pFlashPage1;
		    put_string("OK\n");	     	

			pFlashPage2=(char xdata*)(PAGE_START+1);
            pData2=(unsigned char)*pFlashPage2;

			mData=pData1*256+pData2;
	        printf("flash write return mData %u\n",mData);
	       
		}
	}
	else
	{
	    put_string("FAIL\n");
	}
	while(1) ;
}