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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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