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Diffstat (limited to 'contrib/loaders/flash/msp432/startup_msp432p4.c')
| -rw-r--r-- | contrib/loaders/flash/msp432/startup_msp432p4.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/contrib/loaders/flash/msp432/startup_msp432p4.c b/contrib/loaders/flash/msp432/startup_msp432p4.c new file mode 100644 index 00000000..ed7ea10a --- /dev/null +++ b/contrib/loaders/flash/msp432/startup_msp432p4.c @@ -0,0 +1,122 @@ +/****************************************************************************** +* +* 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) + ; +} |