kopia lustrzana https://github.com/micropython/micropython
253 wiersze
4.3 KiB
C
253 wiersze
4.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "samd_soc.h"
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typedef void (*ISR)(void);
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extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;
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const ISR isr_vector[];
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uint32_t systick_ms;
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void Reset_Handler(void) __attribute__((naked));
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void Reset_Handler(void) {
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// Set stack pointer
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#if __CORTEX_M >= 0x03
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__asm volatile ("ldr sp, =_estack");
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#else
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__asm volatile ("ldr r0, =_estack");
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__asm volatile ("mov sp, r0");
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#endif
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// Copy .data section from flash to RAM
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for (uint32_t *src = &_sidata, *dest = &_sdata; dest < &_edata;) {
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*dest++ = *src++;
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}
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// Zero out .bss section
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for (uint32_t *dest = &_sbss; dest < &_ebss;) {
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*dest++ = 0;
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}
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// When we get here: stack is initialised, bss is clear, data is copied
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#if __FPU_PRESENT == 1 && __FPU_USED == 1
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// Set CP10 and CP11 Full Access
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SCB->CPACR |= (3UL << 10 * 2) | (3UL << 11 * 2);
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#endif
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// SCB->VTOR
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*((volatile uint32_t *)0xe000ed08) = (uint32_t)&isr_vector;
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// SCB->CCR: enable 8-byte stack alignment for IRQ handlers, in accord with EABI
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*((volatile uint32_t *)0xe000ed14) |= 1 << 9;
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// Initialise the cpu and peripherals
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samd_init();
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// Now that we have a basic system up and running we can call main
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samd_main();
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// we must not return
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for (;;) {
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}
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}
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void Default_Handler(void) {
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for (;;) {
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}
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}
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void SysTick_Handler(void) {
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systick_ms += 1;
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}
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const ISR isr_vector[] __attribute__((section(".isr_vector"))) = {
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(ISR)&_estack,
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&Reset_Handler,
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&Default_Handler, // NMI_Handler
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&Default_Handler, // HardFault_Handler
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&Default_Handler, // MemManage_Handler
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&Default_Handler, // BusFault_Handler
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&Default_Handler, // UsageFault_Handler
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0,
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0,
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0,
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0,
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&Default_Handler, // SVC_Handler
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&Default_Handler, // DebugMon_Handler
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0,
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&Default_Handler, // PendSV_Handler
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&SysTick_Handler, // SysTick_Handler
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0, // line 0
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#if defined(MCU_SAMD21)
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USB_Handler_wrapper, // line 7
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#else
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0,
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#endif
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#if defined(MCU_SAMD51)
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&USB_0_Handler_wrapper, // line 80
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&USB_1_Handler_wrapper,
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&USB_2_Handler_wrapper,
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&USB_3_Handler_wrapper,
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#else
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#endif
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};
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