backup_sram.cpp

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#include "backup_sram.h"

#include "stm32f4xx_pwr.h"
#include "stm32f4xx_rcc.h"

#include <cstring> //For memcpy

void backup_sram_init()
{
#pragma GCC diagnostic push // Ignore old style cast from included library
#pragma GCC diagnostic ignored "-Wold-style-cast"
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, DISABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_BKPSRAM, ENABLE);
#pragma GCC diagnostic pop
  PWR_BackupRegulatorCmd(ENABLE);
}

void backup_sram_write(const void *src, size_t len)
{
  PWR_BackupAccessCmd(ENABLE);
#pragma GCC diagnostic push // Ignore old style cast from included library
#pragma GCC diagnostic ignored "-Wold-style-cast"
  std::memcpy(reinterpret_cast<void *>(BKPSRAM_BASE), src, len);
#pragma GCC diagnostic pop
  PWR_BackupAccessCmd(DISABLE);
}

void backup_sram_read(void *dst, size_t len)
{
#pragma GCC diagnostic push // Ignore old style cast from included library
#pragma GCC diagnostic ignored "-Wold-style-cast"
  std::memcpy(dst, reinterpret_cast<const void *>(BKPSRAM_BASE), len);
#pragma GCC diagnostic pop
}

void backup_sram_clear(size_t len)
{
  PWR_BackupAccessCmd(ENABLE);
#pragma GCC diagnostic push // Ignore old style cast from included library
#pragma GCC diagnostic ignored "-Wold-style-cast"
  std::memset(reinterpret_cast<void *>(BKPSRAM_BASE), 0, len);
#pragma GCC diagnostic pop
  PWR_BackupAccessCmd(DISABLE);
}