83 lines
2.8 KiB
C
83 lines
2.8 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) 2015 Glenn Ruben Bakke
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* Copyright (c) 2018 Artur Pacholec
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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 <string.h>
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#include "lib/tinyusb/src/device/usbd.h"
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#include "py/mphal.h"
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#include "py/mpstate.h"
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#include "py/gc.h"
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#include "supervisor/cpu.h"
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#include "supervisor/usb.h"
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#include "csr.h"
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#include "generated/soc.h"
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#include "irq.h"
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void mp_hal_delay_us(mp_uint_t delay) {
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mp_hal_delay_ms(delay / 1000);
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}
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extern void SysTick_Handler(void);
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// This value contains the number of times "common_hal_mcu_disable_interrupts()"
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// has been called without calling "common_hal_mcu_enable_interrupts()". Since
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// this is the interrupt handler, that means we're handling an interrupt, so
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// this value should be `0`.
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//
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// Interrupts should already be disabled when this handler is running, which means
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// this value is logically already `1`. If we didn't do this, then interrupts would
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// be prematurely enabled by interrupt handlers that enable and disable interrupts.
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extern volatile uint32_t nesting_count;
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void isr(void);
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__attribute__((section(".ramtext")))
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void isr(void) {
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uint8_t irqs = irq_pending() & irq_getmask();
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// Increase the "nesting count". Note: This should be going from 0 -> 1.
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nesting_count += 1;
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#ifdef CFG_TUSB_MCU
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if (irqs & (1 << USB_INTERRUPT)) {
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usb_irq_handler();
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}
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#endif
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if (irqs & (1 << TIMER0_INTERRUPT)) {
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SysTick_Handler();
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}
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// Decrease the "nesting count". Note: This should be going from 1 -> 0.
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nesting_count -= 1;
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}
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mp_uint_t cpu_get_regs_and_sp(mp_uint_t *regs) {
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unsigned long __tmp;
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asm volatile ("mv %0, x2" : "=r" (__tmp));
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return __tmp;
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}
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