123 lines
4.6 KiB
C
123 lines
4.6 KiB
C
/******************************************************************************
|
|
*
|
|
* Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* Neither the name of Texas Instruments Incorporated nor the names of
|
|
* its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <stdint.h>
|
|
|
|
/* Entry point for the application. */
|
|
extern int main();
|
|
|
|
/* Reserve space for the system stack. */
|
|
extern uint32_t __stack_top;
|
|
|
|
typedef void(*pFunc)(void);
|
|
|
|
/* Interrupt handler prototypes */
|
|
void default_handler(void);
|
|
void reset_handler(void);
|
|
|
|
/*
|
|
* The vector table. Note that the proper constructs must be placed on this to
|
|
* ensure that it ends up at physical address 0x0000.0000 or at the start of
|
|
* the program if located at a start address other than 0.
|
|
*/
|
|
void (* const intr_vectors[])(void) __attribute__((section(".intvecs"))) = {
|
|
(pFunc)&__stack_top, /* The initial stack pointer */
|
|
reset_handler, /* The reset handler */
|
|
default_handler, /* The NMI handler */
|
|
default_handler, /* The hard fault handler */
|
|
default_handler, /* The MPU fault handler */
|
|
default_handler, /* The bus fault handler */
|
|
default_handler, /* The usage fault handler */
|
|
0, /* Reserved */
|
|
0, /* Reserved */
|
|
0, /* Reserved */
|
|
0, /* Reserved */
|
|
default_handler, /* SVCall handler */
|
|
default_handler, /* Debug monitor handler */
|
|
0, /* Reserved */
|
|
default_handler, /* The PendSV handler */
|
|
default_handler /* The SysTick handler */
|
|
};
|
|
|
|
/*
|
|
* The following are constructs created by the linker, indicating where the
|
|
* the "data" and "bss" segments reside in memory. The initializers for the
|
|
* for the "data" segment resides immediately following the "text" segment.
|
|
*/
|
|
extern uint32_t __bss_start__;
|
|
extern uint32_t __bss_end__;
|
|
|
|
/*
|
|
* This is the code that gets called when the processor first starts execution
|
|
* following a reset event. Only the absolutely necessary set is performed,
|
|
* after which the application supplied entry() routine is called. Any fancy
|
|
* actions (such as making decisions based on the reset cause register, and
|
|
* resetting the bits in that register) are left solely in the hands of the
|
|
* application.
|
|
*/
|
|
__attribute__((section(".reset"))) __attribute__((naked))
|
|
void reset_handler(void)
|
|
{
|
|
/* Set stack pointer */
|
|
__asm(" MOVW.W r0, #0x1700\n"
|
|
" MOVT.W r0, #0x0100\n"
|
|
" mov sp, r0\n");
|
|
|
|
/* Zero fill the bss segment. */
|
|
__asm(" ldr r0, =__bss_start__\n"
|
|
" ldr r1, =__bss_end__\n"
|
|
" mov r2, #0\n"
|
|
" .thumb_func\n"
|
|
"zero_loop:\n"
|
|
" cmp r0, r1\n"
|
|
" it lt\n"
|
|
" strlt r2, [r0], #4\n"
|
|
" blt zero_loop");
|
|
|
|
/* Call the application's entry point. */
|
|
main();
|
|
}
|
|
|
|
/*
|
|
* This is the code that gets called when the processor receives an unexpected
|
|
* interrupt. This simply enters an infinite loop, preserving the system state
|
|
* for examination by a debugger.
|
|
*/
|
|
void default_handler(void)
|
|
{
|
|
/* Enter an infinite loop. */
|
|
while (1)
|
|
;
|
|
}
|