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//*****************************************************************************
//
//! @file startup_gcc.c
//!
//! @brief Definitions for interrupt handlers, the vector table, and the stack.
//
//*****************************************************************************
//*****************************************************************************
//
// Copyright (c) 2017, Ambiq Micro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. 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.
//
// 3. Neither the name of the copyright holder 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 HOLDER 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.
//
// This is part of revision 1.2.9 of the AmbiqSuite Development Package.
//
//*****************************************************************************
#include <stdint.h>
//*****************************************************************************
//
// Forward declaration of interrupt handlers.
//
//*****************************************************************************
extern void am_reset_isr(void) __attribute ((naked));
extern void am_nmi_isr(void) __attribute ((weak));
extern void am_fault_isr(void) __attribute ((weak));
extern void am_mpufault_isr(void) __attribute ((weak, alias ("am_fault_isr")));
extern void am_busfault_isr(void) __attribute ((weak, alias ("am_fault_isr")));
extern void am_usagefault_isr(void) __attribute ((weak, alias ("am_fault_isr")));
extern void am_svcall_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_debugmon_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_pendsv_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_systick_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_brownout_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_watchdog_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_clkgen_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_vcomp_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_ioslave_ios_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_ioslave_acc_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster0_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster1_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster2_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster3_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster4_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_iomaster5_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_gpio_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_ctimer_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_uart_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_uart1_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_adc_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_pdm_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr0_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr1_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr2_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr3_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr4_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr5_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr6_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_stimer_cmpr7_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_flash_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_software0_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_software1_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_software2_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_software3_isr(void) __attribute ((weak, alias ("am_default_isr")));
extern void am_default_isr(void) __attribute ((weak));
//*****************************************************************************
//
// The entry point for the application.
//
//*****************************************************************************
extern int main(void);
//*****************************************************************************
//
// Reserve space for the system stack.
//
//*****************************************************************************
__attribute__ ((section(".stack")))
static uint32_t g_pui32Stack[1024];
//*****************************************************************************
//
// The vector table. Note that the proper constructs must be placed on this to
// ensure that it ends up at physical address 0x0000.0000.
//
// Note: Aliasing and weakly exporting am_mpufault_isr, am_busfault_isr, and
// am_usagefault_isr does not work if am_fault_isr is defined externally.
// Therefore, we'll explicitly use am_fault_isr in the table for those vectors.
//
//*****************************************************************************
__attribute__ ((section(".isr_vector")))
void (* const g_am_pfnVectors[])(void) =
{
(void (*)(void))((uint32_t)g_pui32Stack + sizeof(g_pui32Stack)),
// The initial stack pointer
am_reset_isr, // The reset handler
am_nmi_isr, // The NMI handler
am_fault_isr, // The hard fault handler
am_fault_isr, // The MPU fault handler
am_fault_isr, // The bus fault handler
am_fault_isr, // The usage fault handler
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
am_svcall_isr, // SVCall handle
am_debugmon_isr, // Debug monitor handler
0, // Reserved
am_pendsv_isr, // The PendSV handler
am_systick_isr, // The SysTick handler
//
// Peripheral Interrupts
//
am_brownout_isr, // 0: Brownout
am_watchdog_isr, // 1: Watchdog
am_clkgen_isr, // 2: CLKGEN
am_vcomp_isr, // 3: Voltage Comparator
am_ioslave_ios_isr, // 4: I/O Slave general
am_ioslave_acc_isr, // 5: I/O Slave access
am_iomaster0_isr, // 6: I/O Master 0
am_iomaster1_isr, // 7: I/O Master 1
am_iomaster2_isr, // 8: I/O Master 2
am_iomaster3_isr, // 9: I/O Master 3
am_iomaster4_isr, // 10: I/O Master 4
am_iomaster5_isr, // 11: I/O Master 5
am_gpio_isr, // 12: GPIO
am_ctimer_isr, // 13: CTIMER
am_uart_isr, // 14: UART
am_uart1_isr, // 15: UART
am_adc_isr, // 16: ADC
am_pdm_isr, // 17: ADC
am_stimer_isr, // 18: SYSTEM TIMER
am_stimer_cmpr0_isr, // 19: SYSTEM TIMER COMPARE0
am_stimer_cmpr1_isr, // 20: SYSTEM TIMER COMPARE1
am_stimer_cmpr2_isr, // 21: SYSTEM TIMER COMPARE2
am_stimer_cmpr3_isr, // 22: SYSTEM TIMER COMPARE3
am_stimer_cmpr4_isr, // 23: SYSTEM TIMER COMPARE4
am_stimer_cmpr5_isr, // 24: SYSTEM TIMER COMPARE5
am_stimer_cmpr6_isr, // 25: SYSTEM TIMER COMPARE6
am_stimer_cmpr7_isr, // 26: SYSTEM TIMER COMPARE7
am_flash_isr, // 27: FLASH
am_software0_isr, // 28: SOFTWARE0
am_software1_isr, // 29: SOFTWARE1
am_software2_isr, // 30: SOFTWARE2
am_software3_isr // 31: SOFTWARE3
};
//*****************************************************************************
//
// The following are constructs created by the linker, indicating where the
// the "data" and "bss" segments reside in memory. The initializers for the
// "data" segment resides immediately following the "text" segment.
//
//*****************************************************************************
extern uint32_t _etext;
extern uint32_t _sdata;
extern uint32_t _edata;
extern uint32_t _sbss;
extern uint32_t _ebss;
//*****************************************************************************
//
// 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.
//
//*****************************************************************************
#if defined(__GNUC_STDC_INLINE__)
void
am_reset_isr(void)
{
//
// Set the vector table pointer.
//
__asm(" ldr r0, =0xE000ED08\n"
" ldr r1, =g_am_pfnVectors\n"
" str r1, [r0]");
//
// Set the stack pointer.
//
__asm(" ldr sp, [r1]");
#ifndef NOFPU
//
// Enable the FPU.
//
__asm("ldr r0, =0xE000ED88\n"
"ldr r1,[r0]\n"
"orr r1,#(0xF << 20)\n"
"str r1,[r0]\n"
"dsb\n"
"isb\n");
#endif
//
// Copy the data segment initializers from flash to SRAM.
//
__asm(" ldr r0, =_init_data\n"
" ldr r1, =_sdata\n"
" ldr r2, =_edata\n"
"copy_loop:\n"
" ldr r3, [r0], #4\n"
" str r3, [r1], #4\n"
" cmp r1, r2\n"
" blt copy_loop\n");
//
// Zero fill the bss segment.
//
__asm(" ldr r0, =_sbss\n"
" ldr r1, =_ebss\n"
" mov r2, #0\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();
//
// If main returns then execute a break point instruction
//
__asm(" bkpt ");
}
#else
#error GNU STDC inline not supported.
#endif
//*****************************************************************************
//
// This is the code that gets called when the processor receives a NMI. This
// simply enters an infinite loop, preserving the system state for examination
// by a debugger.
//
//*****************************************************************************
void
am_nmi_isr(void)
{
//
// Go into an infinite loop.
//
while(1)
{
}
}
//*****************************************************************************
//
// This is the code that gets called when the processor receives a fault
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
void
am_fault_isr(void)
{
//
// Go into an infinite loop.
//
while(1)
{
}
}
//*****************************************************************************
//
// 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
am_default_isr(void)
{
//
// Go into an infinite loop.
//
while(1)
{
}
}
|
