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LibrePilot/flight/PiOS/STM32F10x/pios_iap.c
2013-03-24 13:03:55 +02:00

127 lines
3.4 KiB
C

/*!
* @File iap.c
* @Brief
*
* Created on: Sep 6, 2010
* Author: joe
*/
/****************************************************************************************
* Header files
****************************************************************************************/
#include <pios.h>
#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
****************************************************************************************/
/****************************************************************************************
* 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_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE);
/* Enable PWR and BKP clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Enable write access to Backup domain */
PWR_BackupAccessCmd(ENABLE);
/* Clear Tamper pin Event(TE) pending flag */
BKP_ClearFlag();
}
/*!
* \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 = BKP_ReadBackupRegister( MAGIC_REG_1 );
reg2 = BKP_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)
{
BKP_WriteBackupRegister( MAGIC_REG_1, IAP_MAGIC_WORD_1);
}
void PIOS_IAP_SetRequest2(void)
{
BKP_WriteBackupRegister( MAGIC_REG_2, IAP_MAGIC_WORD_2);
}
void PIOS_IAP_ClearRequest(void)
{
BKP_WriteBackupRegister( MAGIC_REG_1, 0);
BKP_WriteBackupRegister( MAGIC_REG_2, 0);
}
uint16_t PIOS_IAP_ReadBootCount(void)
{
return BKP_ReadBackupRegister ( IAP_BOOTCOUNT );
}
void PIOS_IAP_WriteBootCount (uint16_t boot_count)
{
BKP_WriteBackupRegister ( IAP_BOOTCOUNT, boot_count );
}
#endif /* PIOS_INCLUDE_IAP */