134 lines
5.7 KiB
C
134 lines
5.7 KiB
C
/****************************************************************************************
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| Description: bootloader cpu module source file
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| File Name: cpu.c
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|----------------------------------------------------------------------------------------
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| C O P Y R I G H T
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|----------------------------------------------------------------------------------------
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| Copyright (c) 2012 by Feaser http://www.feaser.com All rights reserved
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|----------------------------------------------------------------------------------------
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| L I C E N S E
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|----------------------------------------------------------------------------------------
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| This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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| modify it under the terms of the GNU General Public License as published by the Free
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| Software Foundation, either version 3 of the License, or (at your option) any later
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| version.
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| OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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| without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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| PURPOSE. See the GNU General Public License for more details.
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| You should have received a copy of the GNU General Public License along with OpenBLT.
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| If not, see <http://www.gnu.org/licenses/>.
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| A special exception to the GPL is included to allow you to distribute a combined work
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| that includes OpenBLT without being obliged to provide the source code for any
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| proprietary components. The exception text is included at the bottom of the license
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| file <license.html>.
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "boot.h" /* bootloader generic header */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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#define CPU_USER_PROGRAM_STARTADDR_PTR ((blt_addr) 0x00002004)
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#define CPU_USER_PROGRAM_VECTABLE_OFFSET ((blt_int32u)0x00002000)
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/****************************************************************************************
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* Register definitions
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****************************************************************************************/
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/* vector table offset register */
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#define SCB_VTOR (*((volatile blt_int32u *) 0xE000ED08))
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/****************************************************************************************
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* External functions
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****************************************************************************************/
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extern void reset_handler(void); /* implemented in cstart.s */
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/****************************************************************************************
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** NAME: CpuStartUserProgram
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Starts the user program, if one is present. In this case this function
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** does not return.
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**
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****************************************************************************************/
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void CpuStartUserProgram(void)
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{
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void (*pProgResetHandler)(void);
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/* check if a user program is present by verifying the checksum */
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if (NvmVerifyChecksum() == BLT_FALSE)
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{
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/* not a valid user program so it cannot be started */
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return;
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}
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/* release the communication interface */
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ComFree();
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/* remap user program's vector table */
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SCB_VTOR = CPU_USER_PROGRAM_VECTABLE_OFFSET & (blt_int32u)0x1FFFFF80;
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/* set the address where the bootloader needs to jump to. this is the address of
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* the 2nd entry in the user program's vector table. this address points to the
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* user program's reset handler.
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*/
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pProgResetHandler = (void(*)(void))(*((blt_addr*)CPU_USER_PROGRAM_STARTADDR_PTR));
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/* start the user program by activating its reset interrupt service routine */
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pProgResetHandler();
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} /*** end of CpuStartUserProgram ***/
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/****************************************************************************************
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** NAME: CpuMemCopy
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** PARAMETER: dest destination address for the data.
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** src source address of the data.
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** len length of the data in bytes.
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** RETURN VALUE: none
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** DESCRIPTION: Copies data from the source to the destination address.
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**
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****************************************************************************************/
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void CpuMemCopy(blt_addr dest, blt_addr src, blt_int16u len)
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{
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blt_int8u *from, *to;
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/* set casted pointers */
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from = (blt_int8u *)src;
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to = (blt_int8u *)dest;
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/* copy all bytes from source address to destination address */
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while(len-- > 0)
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{
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/* store byte value from source to destination */
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*to++ = *from++;
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/* keep the watchdog happy */
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CopService();
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}
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} /*** end of CpuMemCopy ***/
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/****************************************************************************************
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** NAME: CpuReset
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Perform a soft reset of the microcontroller by starting from the reset
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** ISR.
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**
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****************************************************************************************/
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void CpuReset(void)
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{
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/* perform a software reset by calling the reset ISR routine */
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reset_handler();
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} /*** end of CpuReset ***/
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/*********************************** end of cpu.c **************************************/
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