circuitpython/ports/samd/samd_isr.c

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