99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/**************************************************************************//**
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* @file boot.c
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* @brief Functions for booting another application
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* @author Silicon Labs
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* @version 1.03
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******************************************************************************
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* @section License
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* <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
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* obligation to support this Software. Silicon Labs is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Silicon Labs will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#include "em_device.h"
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#include "em_gpio.h"
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#include "em_cmu.h"
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#include "app.h"
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/******************************************************************************
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* This function sets up the Cortex-M3 with a new SP and PC.
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*****************************************************************************/
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#if defined ( __CC_ARM )
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__asm void BOOT_jump(uint32_t sp, uint32_t pc)
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{
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/* Set new MSP, PSP based on SP (r0)*/
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msr msp, r0
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msr psp, r0
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/* Jump to PC (r1)*/
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bx r1
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}
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#else
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void __attribute__((optimize("O0"))) BOOT_jump(uint32_t sp, uint32_t pc)
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{
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(void) sp;
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(void) pc;
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/* Set new MSP, PSP based on SP (r0)*/
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__asm("msr msp, r0");
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__asm("msr psp, r0");
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/* Jump to PC (r1)*/
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__asm("mov pc, r1");
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}
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#endif
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/* Resets any peripherals that have been in use by
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* the bootloader before booting the appliation */
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static void resetPeripherals(void)
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{
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}
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/******************************************************************************
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* Boots the firmware. This function will activate the vector table
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* of the firmware application and set the PC and SP from this table.
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*****************************************************************************/
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void __attribute__((optimize("O0"))) BOOT_boot(void)
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{
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uint32_t pc, sp;
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uint32_t *bootAddress = (uint32_t *)(JUMP_LOC);
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resetPeripherals();
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/* Set new vector table */
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SCB->VTOR = (uint32_t)bootAddress;
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/* Read new SP and PC from vector table */
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sp = bootAddress[0];
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pc = bootAddress[1];
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/* Do a jump by loading the PC and SP into the CPU registers */
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BOOT_jump(sp, pc);
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}
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