/**
*****************************************************************************
* @title BKP_BackupData.c
* @author CooCox
* @date 12 Nov 2013
* @brief This example shows how to store user data in the Backup data reg
* isters.As the Backup (BKP) domain still powered by VBAT when VDD
* is switched off, its contents are not lost if a battery is conn
* ected to VBAT pin. After an external reset , the LED PB8 is ligh
* ted up values in the BKP data registers are correct. This exampl
* e has been tested on MCBSTM32, STM32F103RB device.
*******************************************************************************
*/
////// The above comment is automatically generated by CoIDE ///////////////////
/**
******************************************************************************
* @file BKP/BKP_BackupData/main.c
* @author MCD Application Team
* @version V1.0.0
* @date 30-October-2010
* @brief Main program body
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_bkp.h"
#include "stm32f10x_pwr.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#define LED_PORT GPIOB
#define BKP_DR_NUMBER 42
/***************************************************************************//**
* Global variables
******************************************************************************/
GPIO_InitTypeDef GPIO_InitStructure;
uint16_t BKPDataReg[BKP_DR_NUMBER] = { BKP_DR1, BKP_DR2, BKP_DR3, BKP_DR4,
BKP_DR5, BKP_DR6, BKP_DR7, BKP_DR8, BKP_DR9, BKP_DR10, BKP_DR11,
BKP_DR12, BKP_DR13, BKP_DR14, BKP_DR15, BKP_DR16, BKP_DR17, BKP_DR18,
BKP_DR19, BKP_DR20, BKP_DR21, BKP_DR22, BKP_DR23, BKP_DR24, BKP_DR25,
BKP_DR26, BKP_DR27, BKP_DR28, BKP_DR29, BKP_DR30, BKP_DR31, BKP_DR32,
BKP_DR33, BKP_DR34, BKP_DR35, BKP_DR36, BKP_DR37, BKP_DR38, BKP_DR39,
BKP_DR40, BKP_DR41, BKP_DR42 };
/***************************************************************************//**
* Declare function prototype
******************************************************************************/
void WriteToBackupReg(uint16_t FirstBackupData);
uint8_t CheckBackupReg(uint16_t FirstBackupData);
void Delay(__IO uint32_t);
/***************************************************************************//**
* @brief This example shows how to store user data in the Backup data registers.
* As the Backup (BKP) domain still powered by VBAT when VDD is switched off, its
* contents are not lost if a battery is connected to VBAT pin.
******************************************************************************/
void BKP_BackupData(void)
{
/* Enable PWR and BKP clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Enable write access to Backup domain */
PWR_BackupAccessCmd(ENABLE);
/* Clear Tamper pin Event(TE) pending flag */
BKP_ClearFlag();
Delay(0xFFFFFF);
/* Check if the Power On Reset flag is set */
if (RCC_GetFlagStatus(RCC_FLAG_PORRST) == RESET)
{
/* Clear reset flags */
RCC_ClearFlag();
/* Check if Backup data registers are programmed */
if (CheckBackupReg(0x3210) == 0x00)
{ /* Backup data registers values are correct */
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_SET);
}
else
{ /* Backup data registers values are not correct or they are not yet
programmed (when the first time the program is executed) */
/* Write data to Backup data registers */
WriteToBackupReg(0x3210);
}
}
while (1)
{
}
}
/***************************************************************************//**
* @brief Writes data Backup DRx registers.
******************************************************************************/
void WriteToBackupReg(uint16_t FirstBackupData)
{
uint32_t index = 0;
for (index = 0; index < BKP_DR_NUMBER; index++)
{
BKP_WriteBackupRegister(BKPDataReg[index], FirstBackupData + (index
* 0x5A));
}
}
/***************************************************************************//**
* @brief Checks if the Backup DRx registers values are correct or not.
* @param FirstBackupData: data to be compared with Backup data registers.
* @retval
* - 0: All Backup DRx registers values are correct
* - Value different from 0: Number of the first Backup register
* which value is not correct
******************************************************************************/
uint8_t CheckBackupReg(uint16_t FirstBackupData)
{
uint32_t index = 0;
for (index = 0; index < BKP_DR_NUMBER; index++)
{
if (BKP_ReadBackupRegister(BKPDataReg[index]) != (FirstBackupData
+ (index * 0x5A)))
{
return (index + 1);
}
}
return 0;
}
/***************************************************************************//**
* @brief Inserts a delay time.
* @param nCount: specifies the delay time length.
* @retval None
******************************************************************************/
void Delay(__IO uint32_t nCount)
{
for (; nCount != 0; nCount--);
}
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