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/******************************************************************************
*
* 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 "data" and "bss" segments reside in memory. The initializers 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)
;
}
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