BKP读写备份寄存器

一.BKP基本定义.

BKP备份寄存器:可用于存储用户应用程序数据.
VBAT:VDD电源被切由VBAT(备用电池电源)供电。
TAMPER引脚:可以产生的侵入事件将备份寄存器内容清除
RTC引脚:输出RTC校准时钟、RTC闹钟脉冲或者秒脉冲
BKP容量:20字节(中容量、小容量)/84字节(大容量、互联型)

二.BKP基本流程

开启PWR,BKP时钟

RCC_APB1PeriphClockCmd (RCC_APB1Periph_PWR ,ENABLE);//开启PWR时钟RCC_APB1PeriphClockCmd (RCC_APB1Periph_BKP ,ENABLE);//开启BPK时钟

使能PWR备份访问控制

PWR_BackupAccessCmd (ENABLE);//使能PWR

写BKP寄存器

BKP_WriteBackupRegister();

读BKP寄存器

BKP_ReadBackupRegister();

三.代码实现

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Key.h"

uint8_t KeyNum;//定义一个接收按键返回值

uint16_t ArrayWrite[] = {0x1234,0x5678};//定义一个写入数组
uint16_t ArrayRead[2];//定义一个接收数组

int main(void)
{
	OLED_Init ();//OLED函数
	Key_Init ();//Key函数
	
	OLED_ShowString (1,1,"W:");
	OLED_ShowString (2,1,"R:");
	
   //开启时钟
	RCC_APB1PeriphClockCmd (RCC_APB1Periph_PWR ,ENABLE);//开启PWR时钟
	RCC_APB1PeriphClockCmd (RCC_APB1Periph_BKP ,ENABLE);//开启BPK时钟
	
	//使能
	PWR_BackupAccessCmd (ENABLE);//使能PWR
		
	while(1)
	{
      KeyNum = Key_GetNum ();//使用KeyNum接收Key按键返回值
		
		if(KeyNum ==1)//
		{
			ArrayWrite [0] ++;
			ArrayWrite [1] ++;//按键按下写入数据自增
			
			BKP_WriteBackupRegister(BKP_DR1,ArrayWrite [0]);//写入BKP数组0数据
			BKP_WriteBackupRegister(BKP_DR2,ArrayWrite [1]);//写入BKP数组1数据
			
			OLED_ShowHexNum (1,3,ArrayWrite [0],4);
			OLED_ShowHexNum (1,8,ArrayWrite [1],4);
		}
	        ArrayRead[0] = BKP_ReadBackupRegister(BKP_DR1);//读取写入BKP数组0数据
	        ArrayRead[1] = BKP_ReadBackupRegister(BKP_DR2);//读取写入BKP数组1数据
	        
	        OLED_ShowHexNum (2,3,ArrayRead [0],4);
	        OLED_ShowHexNum (2,8,ArrayRead [1],4);
    }
}