SAMV71 Xplained Ultra Software Package 1.5

loader.c

00001 /* ----------------------------------------------------------------------------
00002  *         SAM Software Package License
00003  * ----------------------------------------------------------------------------
00004  * Copyright (c) 2015, Atmel Corporation
00005  *
00006  * All rights reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions are met:
00010  *
00011  * - Redistributions of source code must retain the above copyright notice,
00012  * this list of conditions and the disclaimer below.
00013  *
00014  * Atmel's name may not be used to endorse or promote products derived from
00015  * this software without specific prior written permission.
00016  *
00017  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00019  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
00020  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00022  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
00023  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00024  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00025  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
00026  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  * ----------------------------------------------------------------------------
00028  */
00029 
00030 
00031 /*----------------------------------------------------------------------------
00032  *        Headers
00033  *----------------------------------------------------------------------------*/
00034 #include "board.h"
00035 #include "loader.h"
00036 
00037 /*----------------------------------------------------------------------------
00038  *        Imported variables
00039  *----------------------------------------------------------------------------*/
00040 
00041 /*----------------------------------------------------------------------------
00042  *        Exported variables
00043  *----------------------------------------------------------------------------*/
00044 
00045 /*----------------------------------------------------------------------------
00046  *        Local variables
00047  *----------------------------------------------------------------------------*/
00048 
00049 /*----------------------------------------------------------------------------
00050  *        Local functions
00051  *----------------------------------------------------------------------------*/
00052 /**
00053  * \brief Run Application which is flashed at given address.
00054  */
00055 static void _RunApplication(uint32_t appAddress)
00056 {
00057     uint32_t __Start_SP;
00058     uint32_t (*__Start_New)(void);
00059     uint32_t *pCode = (uint32_t *)appAddress;
00060 
00061     /* set PC and SP */
00062     __Start_New = (uint32_t(*) (void) ) pCode[1];
00063     __Start_SP = pCode[0];
00064 
00065     printf("\n\r Starting application at flash 0x%08x! \n\r", (unsigned int)appAddress);
00066     printf("========================================================= \n\r");
00067 
00068     WDT_Restart(WDT);
00069     __disable_irq();
00070     __set_MSP(__Start_SP);
00071     __Start_New();
00072 }
00073 
00074 
00075 /*----------------------------------------------------------------------------
00076  *        Exported functions
00077  *----------------------------------------------------------------------------*/
00078 /**
00079  *  \brief Judge preconditions of applications and run one of them
00080  *
00081  *  \param pAppConfig   pointer to AppConfig instances.
00082  *  \param appNum       Number of applications
00083  *  \return void
00084  */
00085 void LOADER_AppSwitch(AppConfig *pAppConfig, uint32_t appNum)
00086 {
00087     uint32_t i;
00088     uint32_t rc = 0;
00089     for (i = 0; i < appNum; i++, pAppConfig++) {
00090         printf("\n\r APP %d: %s", (int)i, (char*)pAppConfig->appInfo);
00091 
00092         rc = (pAppConfig->funPreCondition) ? pAppConfig->funPreCondition() : 0;
00093 
00094         if ( 0 == rc) {
00095             printf("\n\r-I- preconditions satisfied.\n\r");
00096             _RunApplication(pAppConfig->appAddress);
00097         } else {
00098             printf("\n\r-I- preconditions not satisfied.\n\r");
00099         }
00100     }
00101     printf("\n\r-I- None of the preconditions are satisfied, applications won't be loaded.");
00102 }
00103 
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