关于STM32备份寄存器的问题！

gaoxiaohu110 · 发表于 2016-4-30 17:26:09

备份寄存器BKP保存数据,前10个读写都很正常，从11个往后写入数据，读出来全部是0,不知道为什么，还是我设置的有问题，求解释？

#define BKP_DR1                         ((uint16_t)0x0004)
#define BKP_DR2                         ((uint16_t)0x0008)
#define BKP_DR3                         ((uint16_t)0x000C)
#define BKP_DR4                         ((uint16_t)0x0010)
#define BKP_DR5                         ((uint16_t)0x0014)
#define BKP_DR6                         ((uint16_t)0x0018)
#define BKP_DR7                         ((uint16_t)0x001C)
#define BKP_DR8                         ((uint16_t)0x0020)
#define BKP_DR9                         ((uint16_t)0x0024)
#define BKP_DR10                         ((uint16_t)0x0028)

以下不正常，读出来的数据全是0；
#define BKP_DR11                         ((uint16_t)0x0040)
#define BKP_DR12                         ((uint16_t)0x0044)
#define BKP_DR13                         ((uint16_t)0x0048)
#define BKP_DR14                         ((uint16_t)0x004C)
#define BKP_DR15                         ((uint16_t)0x0050)
#define BKP_DR16                         ((uint16_t)0x0054)
#define BKP_DR17                         ((uint16_t)0x0058)
#define BKP_DR18                         ((uint16_t)0x005C)
#define BKP_DR19                         ((uint16_t)0x0060)
#define BKP_DR20                         ((uint16_t)0x0064)

void BKP_Init(void)
{
unsigned int i,j;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
  PWR_BackupAccessCmd(ENABLE);
//usRegHoldingBuf[0]  状态寄存器
for(i=1;i<11;i++)
{
usRegHoldingBuf= BKP_ReadBackupRegister(i*4);
}
   usRegHoldingBuf[12]= BKP_ReadBackupRegister(BKP_DR12);    //单独测试

// for(j=11;j<32;j++)
// {
//    usRegHoldingBuf[j]= BKP_ReadBackupRegister((j-11)*4+64);
// }
}

void Write_BKP(void)
{
u16 i,j;
for(i=1;i<11;i++)
{
   BKP_WriteBackupRegister(i*4, usRegHoldingBuf);
}
   BKP_WriteBackupRegister(BKP_DR12, usRegHoldingBuf[12]);  //单独测试

// for(j=11;j<32;j++)
// {
//    BKP_WriteBackupRegister((j-11)*4+64, usRegHoldingBuf[j]);
// }

}