求教如何断电保存一个U16的变量？

rockyhuo

原子的mini版，用II2和FLASH模拟EEPROM连个例程，都不能存储一个U16变量的数据,用例程下载下去是正常的，可以断电记忆

u16 a;
const u8 TEXT_Buffer[]={"Good,morning"};
#define SIZE sizeof(a)

 int main(void)
 { 
u8 key;
u16 i=0;
u8 datatemp;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2
delay_init();     //延时函数初始化  
uart_init(9600); //串口初始化为9600
LED_Init();   //初始化与LED连接的硬件接口
  LCD_Init();
KEY_Init(); //按键初始化
AT24CXX_Init(); //IIC初始化 

  POINT_COLOR=RED;//设置字体为红色 
LCD_ShowString(60,50,200,16,16,"Mini STM32");
LCD_ShowString(60,70,200,16,16,"IIC TEST");
LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(60,110,200,16,16,"2014/3/9");
LCD_ShowString(60,130,200,16,16,"WK_UP:Write  KEY0:Read"); //显示提示信息
  while(AT24CXX_Check())//检测不到24c02
{
LCD_ShowString(60,150,200,16,16,"24C02 Check Failed!");
delay_ms(500);
LCD_ShowString(60,150,200,16,16,"Please Check!      ");
delay_ms(500);
LED0=!LED0;//DS0闪烁
}
LCD_ShowString(60,150,200,16,16,"24C02 Ready!");    
  POINT_COLOR=BLUE;//设置字体为蓝色  
while(1)
{
key=KEY_Scan(0);
if(key==WKUP_PRES)//WK_UP 按下,写入24C02
{
a++;
LCD_Fill(0,170,239,319,WHITE);//清除半屏    
  LCD_ShowString(60,170,200,16,16,"Start Write 24C02....");
AT24CXX_Write(0,(u8*)a,SIZE);
LCD_ShowString(60,170,200,16,16,"24C02 Write Finished!");//提示传送完成
}
if(key==KEY0_PRES)//KEY0 按下,读取字符串并显示
{
  LCD_ShowString(60,170,200,16,16,"Start Read 24C02.... ");
AT24CXX_Read(0,(u8*)datatemp,SIZE);
LCD_ShowString(60,170,200,16,16,"The Data Readed Is:  ");//提示传送完成
//LCD_ShowString(60,190,200,16,16,datatemp);//显示读到的字符串
LCD_ShowxNum(90,170,datatemp,5,16,1);
}
i++;
delay_ms(10);
if(i==20)
{
LED0=!LED0;//提示系统正在运行
i=0;
}   
}
}

正点原子

你的方法有问题。