1 int main(void)
 2 {
 3 #ifdef DEBUG
 4   debug();
 5 #endif
 6
 7   /* System Clocks Configuration */
 8   RCC_Configuration();
 9
10   /* NVIC configuration */
11   NVIC_Configuration();
12
13   /* GPIO configuration */
14   GPIO_Configuration();
15
16   /* Enable PWR and BKP clock */
17   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
18
19   /* Enable write access to Backup domain */
20   PWR_BackupAccessCmd(ENABLE);
21
22   /* Clear Tamper pin Event(TE) pending flag */
23   BKP_ClearFlag();
24
25   //首先判断是不是上电复位的
26   if(RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)
27   {
28     /* Clear reset flags */
29     RCC_ClearFlag();
30
31     /* Turn on led connected to GPIO_LED Pin8 */
32     GPIO_SetBits(GPIO_LED, GPIO_Pin_8);
33
34     /* Check if Backup data registers are programmed */
35     if(CheckBackupReg(0x3211) == 0x00)
36     { /* Backup data registers values are correct */
37
38       /* Turn on led connected to GPIO_LED Pin6 */
39       GPIO_SetBits(GPIO_LED, GPIO_Pin_6);
40     }
41     else
42     { /* Backup data registers values are not correct or they are not yet
43          programmed (when the first time the program is executed) */
44
45       /* Write data to Backup data registers */
46       WriteToBackupReg(0x3211);
47
48       /* Turn on led connected to GPIO_LED Pin7 */
49       GPIO_SetBits(GPIO_LED, GPIO_Pin_7);
50     }
51   }
52
53   /* Turn on led connected to GPIO_LED Pin9 */
54   GPIO_SetBits(GPIO_LED, GPIO_Pin_9);
55
56   while (1)
57   {
58   }
59 }