flight/pios/stm32f4xx/pios_bkp.c

   1 /**
   2  ******************************************************************************
   3  * @addtogroup PIOS PIOS Core hardware abstraction layer
   4  * @{
   5  * @addtogroup PIOS_BKP Backup SRAM functions
   6  * @brief Hardware abstraction layer for backup sram
   7  * @{
   8  *
   9  * @file       pios_bkp.c
  10  * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2013.
  11  * @brief      IAP functions
  12  * @see        The GNU Public License (GPL) Version 3
  13  *
  14  *****************************************************************************/
  15 /*
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 3 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful, but
  22  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  23  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  24  * for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License along
  27  * with this program; if not, write to the Free Software Foundation, Inc.,
  28  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #include <pios.h>
  32 #include <pios_bkp.h>
  33 #include <stm32f4xx_rtc.h>
  34
  35 /****************************************************************************************
  36 *  Header files
  37 ****************************************************************************************/
  38
  39 /*****************************************************************************************
  40  *      Public Definitions/Macros
  41  ****************************************************************************************/
  42
  43 /****************************************************************************************
  44 *  Public Functions
  45 ****************************************************************************************/
  46 const uint32_t pios_bkp_registers_map[] = {
  47     RTC_BKP_DR0,
  48     RTC_BKP_DR1,
  49     RTC_BKP_DR2,
  50     RTC_BKP_DR3,
  51     RTC_BKP_DR4,
  52     RTC_BKP_DR5,
  53     RTC_BKP_DR6,
  54     RTC_BKP_DR7,
  55     RTC_BKP_DR8,
  56     RTC_BKP_DR9,
  57     RTC_BKP_DR10,
  58     RTC_BKP_DR11,
  59     RTC_BKP_DR12,
  60     RTC_BKP_DR13,
  61     RTC_BKP_DR14,
  62     RTC_BKP_DR15,
  63     RTC_BKP_DR16,
  64     RTC_BKP_DR17,
  65     RTC_BKP_DR18,
  66     RTC_BKP_DR19
  67 };
  68 #define PIOS_BKP_REGISTERS_COUNT NELEMENTS(pios_bkp_registers_map)
  69
  70 void PIOS_BKP_Init(void)
  71 {
  72     /* Enable CRC clock */
  73     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_CRC | RCC_AHB1Periph_BKPSRAM, ENABLE);
  74
  75     /* Enable PWR and BKP clock */
  76     RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  77
  78     /* Clear Tamper pin Event(TE) pending flag */
  79     RTC_ClearFlag(RTC_FLAG_TAMP1F);
  80 }
  81
  82 uint16_t PIOS_BKP_ReadRegister(uint32_t regnumber)
  83 {
  84     if (PIOS_BKP_REGISTERS_COUNT < regnumber) {
  85         PIOS_Assert(0);
  86     } else {
  87         return (uint16_t)RTC_ReadBackupRegister(pios_bkp_registers_map[regnumber]);
  88     }
  89 }
  90
  91 void PIOS_BKP_WriteRegister(uint32_t regnumber, uint16_t data)
  92 {
  93     if (PIOS_BKP_REGISTERS_COUNT < regnumber) {
  94         PIOS_Assert(0);
  95     } else {
  96         RTC_WriteBackupRegister(pios_bkp_registers_map[regnumber], (uint32_t)data);
  97     }
  98 }
  99
 100 void PIOS_BKP_EnableWrite(void)
 101 {
 102     /* Enable write access to Backup domain */
 103     PWR_BackupAccessCmd(ENABLE);
 104 }
 105
 106 void PIOS_BKP_DisableWrite(void)
 107 {
 108     /* Enable write access to Backup domain */
 109     PWR_BackupAccessCmd(DISABLE);
 110 }
 111
 112
 113 /****************************************************************************************
 114 *  Public Data
 115 ****************************************************************************************/