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