133 lines
4.2 KiB
C
133 lines
4.2 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) 2018 Scott Shawcroft for Adafruit Industries
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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 "peripherals/external_interrupts.h"
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#include "peripherals/clocks.h"
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#include "sam.h"
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void turn_on_external_interrupt_controller(void) {
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MCLK->APBAMASK.bit.EIC_ = true;
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// We use the 48mhz clock to lightly filter the incoming pulse to reduce spurious interrupts.
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connect_gclk_to_peripheral(GCLK_PCHCTRL_GEN_GCLK1_Val, EIC_GCLK_ID);
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eic_set_enable(true);
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}
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void turn_off_external_interrupt_controller(void) {
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eic_set_enable(false);
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MCLK->APBAMASK.bit.EIC_ = false;
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disconnect_gclk_from_peripheral(GCLK_PCHCTRL_GEN_GCLK1_Val, EIC_GCLK_ID);
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}
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void turn_on_cpu_interrupt(uint8_t eic_channel) {
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// Ignore the channel since the CPU interrupt line is shared.
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(void) eic_channel;
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NVIC_DisableIRQ(EIC_0_IRQn + eic_channel);
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NVIC_ClearPendingIRQ(EIC_0_IRQn + eic_channel);
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NVIC_EnableIRQ(EIC_0_IRQn + eic_channel);
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}
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bool eic_get_enable(void) {
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return EIC->CTRLA.bit.ENABLE;
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}
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void eic_set_enable(bool value) {
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EIC->CTRLA.bit.ENABLE = value;
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while (EIC->SYNCBUSY.bit.ENABLE != 0) {}
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// This won't actually block long enough in Rev A of SAMD51 and will miss edges in the first
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// three cycles of the peripheral clock. See the errata for details. It shouldn't impact us.
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}
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void eic_reset(void) {
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EIC->CTRLA.bit.SWRST = true;
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while (EIC->SYNCBUSY.bit.SWRST != 0) {}
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// This won't actually block long enough in Rev A of SAMD51 and will miss edges in the first
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// three cycles of the peripheral clock. See the errata for details. It shouldn't impact us.
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for (int i = 0; i < EIC_EXTINT_NUM; i++) {
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set_eic_channel_data(i, NULL);
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NVIC_DisableIRQ(EIC_0_IRQn + i);
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NVIC_ClearPendingIRQ(EIC_0_IRQn + i);
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}
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}
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bool eic_channel_free(uint8_t eic_channel) {
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uint32_t mask = 1 << eic_channel;
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return get_eic_channel_data(eic_channel) == NULL &&
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(EIC->INTENSET.bit.EXTINT & mask) == 0 &&
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(EIC->EVCTRL.bit.EXTINTEO & mask) == 0;
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}
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void EIC_0_Handler(void) {
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external_interrupt_handler(0);
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}
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void EIC_1_Handler(void) {
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external_interrupt_handler(1);
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}
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void EIC_2_Handler(void) {
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external_interrupt_handler(2);
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}
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void EIC_3_Handler(void) {
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external_interrupt_handler(3);
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}
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void EIC_4_Handler(void) {
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external_interrupt_handler(4);
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}
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void EIC_5_Handler(void) {
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external_interrupt_handler(5);
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}
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void EIC_6_Handler(void) {
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external_interrupt_handler(6);
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}
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void EIC_7_Handler(void) {
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external_interrupt_handler(7);
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}
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void EIC_8_Handler(void) {
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external_interrupt_handler(8);
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}
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void EIC_9_Handler(void) {
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external_interrupt_handler(9);
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}
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void EIC_10_Handler(void) {
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external_interrupt_handler(10);
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}
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void EIC_11_Handler(void) {
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external_interrupt_handler(11);
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}
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void EIC_12_Handler(void) {
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external_interrupt_handler(12);
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}
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void EIC_13_Handler(void) {
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external_interrupt_handler(13);
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}
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void EIC_14_Handler(void) {
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external_interrupt_handler(14);
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}
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void EIC_15_Handler(void) {
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external_interrupt_handler(15);
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}
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