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123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*!
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* @File iap.c
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* @Brief
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*
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* Created on: Sep 6, 2010
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* Author: joe
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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_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE);
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/* Enable PWR and BKP clock */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, 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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BKP_ClearFlag();
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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 = BKP_ReadBackupRegister( MAGIC_REG_1 );
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reg2 = BKP_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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BKP_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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BKP_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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BKP_WriteBackupRegister( MAGIC_REG_1, 0);
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BKP_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 BKP_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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BKP_WriteBackupRegister ( IAP_BOOTCOUNT, boot_count );
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}
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