diff options
Diffstat (limited to 'ports/samd/samd_isr.c')
| -rw-r--r-- | ports/samd/samd_isr.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/ports/samd/samd_isr.c b/ports/samd/samd_isr.c new file mode 100644 index 000000000..8341df8c6 --- /dev/null +++ b/ports/samd/samd_isr.c @@ -0,0 +1,252 @@ +/* + * 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 + 0, + 0, + 0, + 0, + 0, + 0, + #if defined(MCU_SAMD21) + USB_Handler_wrapper, // line 7 + #else + 0, + #endif + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + #if defined(MCU_SAMD51) + &USB_0_Handler_wrapper, // line 80 + &USB_1_Handler_wrapper, + &USB_2_Handler_wrapper, + &USB_3_Handler_wrapper, + #else + 0, + 0, + 0, + 0, + #endif + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 0, +}; |