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LibrePilot/flight/PiOS/STM32F4xx/pios_iap.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_IAP IAP Functions
* @brief STM32F4xx Hardware dependent I2C functionality
* @{
*
* @file pios_iap.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief In application programming functions
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/****************************************************************************************
* Header files
****************************************************************************************/
#include <pios.h>
/****************************************************************************************
* Private Definitions/Macros
****************************************************************************************/
/* these definitions reside here for protection and privacy. */
#define IAP_MAGIC_WORD_1 0x1122
#define IAP_MAGIC_WORD_2 0xAA55
#define UPPERWORD16(lw) (uint16_t)((uint32_t)(lw)>>16)
#define LOWERWORD16(lw) (uint16_t)((uint32_t)(lw)&0x0000ffff)
#define UPPERBYTE(w) (uint8_t)((w)>>8)
#define LOWERBYTE(w) (uint8_t)((w)&0x00ff)
/****************************************************************************************
* Private Functions
****************************************************************************************/
/****************************************************************************************
* Private (static) Data
****************************************************************************************/
/****************************************************************************************
* Public/Global Data
****************************************************************************************/
/*!
* \brief PIOS_IAP_Init - performs required initializations for iap module.
* \param none.
* \return none.
* \retval none.
*
* Created: Sep 8, 2010 10:10:48 PM by joe
*/
void PIOS_IAP_Init( void )
{
/* Enable CRC clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_CRC, ENABLE);
/* Enable PWR and BKP clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_AHB1Periph_BKPSRAM, ENABLE);
/* Enable write access to Backup domain */
PWR_BackupAccessCmd(ENABLE);
/* Clear Tamper pin Event(TE) pending flag */
RTC_ClearFlag(RTC_FLAG_TAMP1F);
}
/*!
* \brief Determines if an In-Application-Programming request has been made.
* \param *comm - Which communication stream to use for the IAP (USB, Telemetry, I2C, SPI, etc)
* \return TRUE - if correct sequence found, along with 'comm' updated.
* FALSE - Note that 'comm' will have an invalid comm identifier.
* \retval
*
*/
uint32_t PIOS_IAP_CheckRequest( void )
{
uint32_t retval = false;
uint16_t reg1;
uint16_t reg2;
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reg1 = RTC_ReadBackupRegister( MAGIC_REG_1 );
reg2 = RTC_ReadBackupRegister( MAGIC_REG_2 );
if( reg1 == IAP_MAGIC_WORD_1 && reg2 == IAP_MAGIC_WORD_2 ) {
// We have a match.
retval = true;
} else {
retval = false;
}
return retval;
}
/*!
* \brief Sets the 1st word of the request sequence.
* \param n/a
* \return n/a
* \retval
*/
void PIOS_IAP_SetRequest1(void)
{
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RTC_WriteBackupRegister( MAGIC_REG_1, IAP_MAGIC_WORD_1);
}
void PIOS_IAP_SetRequest2(void)
{
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RTC_WriteBackupRegister( MAGIC_REG_2, IAP_MAGIC_WORD_2);
}
void PIOS_IAP_ClearRequest(void)
{
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RTC_WriteBackupRegister( MAGIC_REG_1, 0);
RTC_WriteBackupRegister( MAGIC_REG_2, 0);
}
uint16_t PIOS_IAP_ReadBootCount(void)
{
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return RTC_ReadBackupRegister ( IAP_BOOTCOUNT );
}
void PIOS_IAP_WriteBootCount (uint16_t boot_count)
{
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RTC_WriteBackupRegister ( IAP_BOOTCOUNT, boot_count );
}