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