89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
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/*
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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/events.h"
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#include "peripherals/clocks.h"
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#include "py/runtime.h"
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#include "hri/hri_mclk_d51.h"
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void turn_on_event_system(void) {
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hri_mclk_set_APBBMASK_EVSYS_bit(MCLK);
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}
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void reset_event_system(void) {
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EVSYS->CTRLA.bit.SWRST = true;
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hri_mclk_clear_APBBMASK_EVSYS_bit(MCLK);
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}
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bool event_channel_free(uint8_t channel) {
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uint8_t generator;
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generator = EVSYS->Channel[channel].CHANNEL.bit.EVGEN;
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return generator == 0;
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}
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void disable_event_channel(uint8_t channel_number) {
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EVSYS->Channel[channel_number].CHANNEL.reg = 0;
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}
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void disable_event_user(uint8_t user_number) {
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EVSYS->USER[user_number].reg = 0;
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}
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void connect_event_user_to_channel(uint8_t user, uint8_t channel) {
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EVSYS->USER[user].reg = channel + 1;
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}
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void init_async_event_channel(uint8_t channel, uint8_t generator) {
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EVSYS->Channel[channel].CHANNEL.reg = EVSYS_CHANNEL_EVGEN(generator) | EVSYS_CHANNEL_PATH_ASYNCHRONOUS;
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}
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void init_event_channel_interrupt(uint8_t channel, uint8_t gclk, uint8_t generator) {
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connect_gclk_to_peripheral(gclk, EVSYS_GCLK_ID_0 + channel);
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EVSYS->Channel[channel].CHANNEL.reg = EVSYS_CHANNEL_EVGEN(generator) |
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EVSYS_CHANNEL_PATH_SYNCHRONOUS |
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EVSYS_CHANNEL_EDGSEL_RISING_EDGE;
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EVSYS->Channel[channel].CHINTFLAG.reg = EVSYS_CHINTFLAG_EVD | EVSYS_CHINTFLAG_OVR;
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EVSYS->Channel[channel].CHINTENSET.reg = EVSYS_CHINTENSET_EVD | EVSYS_CHINTENSET_OVR;
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}
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bool event_interrupt_active(uint8_t channel) {
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bool active = false;
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active = EVSYS->Channel[channel].CHINTFLAG.bit.EVD;
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// Only clear if we know its active, otherwise there is the possibility it becomes after we
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// check but before we clear.
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if (active) {
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EVSYS->Channel[channel].CHINTFLAG.reg = EVSYS_CHINTFLAG_EVD | EVSYS_CHINTFLAG_OVR;
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}
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return active;
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}
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bool event_interrupt_overflow(uint8_t channel) {
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return EVSYS->Channel[channel].CHINTFLAG.bit.OVR;
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}
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