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LibrePilot/flight/pios/common/pios_iap.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_IAP IAP Functions
* @brief Common IAP 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>
#include <pios_bkp.h>
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#ifdef PIOS_INCLUDE_IAP
/****************************************************************************************
* 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
****************************************************************************************/
const uint16_t pios_iap_cmd_list[] = {
IAP_CMD1,
IAP_CMD2,
IAP_CMD3
};
/****************************************************************************************
* 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)
{
PIOS_BKP_Init();
PIOS_BKP_EnableWrite();
}
/*!
* \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;
reg1 = PIOS_BKP_ReadRegister(MAGIC_REG_1);
reg2 = PIOS_BKP_ReadRegister(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)
{
PIOS_BKP_WriteRegister(MAGIC_REG_1, IAP_MAGIC_WORD_1);
}
void PIOS_IAP_SetRequest2(void)
{
PIOS_BKP_WriteRegister(MAGIC_REG_2, IAP_MAGIC_WORD_2);
}
void PIOS_IAP_ClearRequest(void)
{
PIOS_BKP_WriteRegister(MAGIC_REG_1, 0);
PIOS_BKP_WriteRegister(MAGIC_REG_2, 0);
}
uint16_t PIOS_IAP_ReadBootCount(void)
{
return PIOS_BKP_ReadRegister(IAP_BOOTCOUNT);
}
void PIOS_IAP_WriteBootCount(uint16_t boot_count)
{
PIOS_BKP_WriteRegister(IAP_BOOTCOUNT, boot_count);
}
/**
* @brief Return one of the IAP command values passed from bootloader.
* @param number: the index of the command value (0..2).
* @retval the selected command value.
*/
uint32_t PIOS_IAP_ReadBootCmd(uint8_t number)
{
if (PIOS_IAP_CMD_COUNT < number) {
PIOS_Assert(0);
} else {
return PIOS_BKP_ReadRegister(pios_iap_cmd_list[number]);
}
}
/**
* @brief Write one of the IAP command values to be passed to firmware from bootloader.
* @param number: the index of the command value (0..2).
* @param value: value to be written.
*/
void PIOS_IAP_WriteBootCmd(uint8_t number, uint32_t value)
{
if (PIOS_IAP_CMD_COUNT < number) {
PIOS_Assert(0);
} else {
PIOS_BKP_WriteRegister(pios_iap_cmd_list[number], value);
}
}
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#endif /* PIOS_INCLUDE_IAP */