circuitpython/ports/atmel-samd/events.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
*
* 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 "events.h"
#include "clocks.h"
#include "py/runtime.h"
#ifdef SAMD21
#include "hpl/pm/hpl_pm_base.h"
#endif
#ifdef SAMD51
#include "hri/hri_mclk_d51.h"
#endif
void turn_on_event_system(void) {
#ifdef SAMD51
hri_mclk_set_APBBMASK_EVSYS_bit(MCLK);
#endif
#ifdef SAMD21
_pm_enable_bus_clock(PM_BUS_APBC, EVSYS);
#endif
}
void reset_event_system(void) {
#ifdef SAMD51
EVSYS->CTRLA.bit.SWRST = true;
hri_mclk_clear_APBBMASK_EVSYS_bit(MCLK);
#endif
#ifdef SAMD21
EVSYS->CTRL.bit.SWRST = true;
_pm_disable_bus_clock(PM_BUS_APBC, EVSYS);
#endif
}
static bool channel_free(int8_t channel) {
uint8_t generator;
#ifdef SAMD51
generator = EVSYS->Channel[channel].CHANNEL.bit.EVGEN;
#endif
#ifdef SAMD21
// Explicitly do a byte write so the peripheral knows we're just wanting to read the channel
// rather than write to it.
*((uint8_t*) &EVSYS->CHANNEL.reg) = channel;
generator = (EVSYS->CHANNEL.reg & EVSYS_CHANNEL_EVGEN_Msk) >> EVSYS_CHANNEL_EVGEN_Pos;
#endif
return generator == 0;
}
uint8_t find_async_event_channel(void) {
int8_t channel;
for (channel = EVSYS_CHANNELS - 1; channel > 0; channel--) {
if (channel_free(channel)) {
break;
}
}
if (channel < 0) {
mp_raise_RuntimeError("All event channels in use");
}
return channel;
}
#ifdef SAMD21
#define EVSYS_SYNCH_NUM EVSYS_CHANNELS
#endif
uint8_t find_sync_event_channel(void) {
int8_t channel;
for (channel = 0; channel < EVSYS_SYNCH_NUM; channel++) {
if (channel_free(channel)) {
break;
}
}
if (channel >= EVSYS_SYNCH_NUM) {
mp_raise_RuntimeError("All sync event channels in use");
}
return channel;
}
void disable_event_channel(uint8_t channel_number) {
#ifdef SAMD51
EVSYS->Channel[channel_number].CHANNEL.reg = 0;
#endif
#ifdef SAMD21
EVSYS->CHANNEL.reg = EVSYS_CHANNEL_CHANNEL(channel_number);
#endif
}
void disable_event_user(uint8_t user_number) {
#ifdef SAMD51
EVSYS->USER[user_number].reg = 0;
#endif
#ifdef SAMD21
EVSYS->USER.reg = EVSYS_USER_USER(user_number);
#endif
}
void connect_event_user_to_channel(uint8_t user, uint8_t channel) {
#ifdef SAMD51
EVSYS->USER[user].reg = channel + 1;
#endif
#ifdef SAMD21
EVSYS->USER.reg = EVSYS_USER_USER(user) | EVSYS_USER_CHANNEL(channel + 1);
#endif
}
void init_async_event_channel(uint8_t channel, uint8_t generator) {
#ifdef SAMD51
EVSYS->Channel[channel].CHANNEL.reg = EVSYS_CHANNEL_EVGEN(generator) | EVSYS_CHANNEL_PATH_ASYNCHRONOUS;
#endif
#ifdef SAMD21
EVSYS->CHANNEL.reg = EVSYS_CHANNEL_CHANNEL(channel) | EVSYS_CHANNEL_EVGEN(generator) | EVSYS_CHANNEL_PATH_ASYNCHRONOUS;
#endif
}
void init_event_channel_interrupt(uint8_t channel, uint8_t gclk, uint8_t generator) {
connect_gclk_to_peripheral(gclk, EVSYS_GCLK_ID_0 + channel);
#ifdef SAMD51
EVSYS->Channel[channel].CHANNEL.reg = EVSYS_CHANNEL_EVGEN(generator) |
EVSYS_CHANNEL_PATH_SYNCHRONOUS |
EVSYS_CHANNEL_EDGSEL_RISING_EDGE;
#endif
#ifdef SAMD21
EVSYS->CHANNEL.reg = EVSYS_CHANNEL_CHANNEL(channel) |
EVSYS_CHANNEL_EVGEN(generator) |
EVSYS_CHANNEL_PATH_RESYNCHRONIZED |
EVSYS_CHANNEL_EDGSEL_RISING_EDGE;
if (channel > 7) {
uint8_t value = 1 << (channel - 7);
EVSYS->INTFLAG.reg = EVSYS_INTFLAG_EVDp8(value) | EVSYS_INTFLAG_OVRp8(value);
EVSYS->INTENSET.reg = EVSYS_INTENSET_EVDp8(value) | EVSYS_INTENSET_OVRp8(value);
} else {
uint8_t value = 1 << channel;
EVSYS->INTFLAG.reg = EVSYS_INTFLAG_EVD(value) | EVSYS_INTFLAG_OVR(value);
EVSYS->INTENSET.reg = EVSYS_INTENSET_EVD(value) | EVSYS_INTENSET_OVR(value);
}
#endif
}
bool event_interrupt_active(uint8_t channel) {
bool active = false;
#ifdef SAMD21
if (channel > 7) {
uint8_t value = 1 << (channel - 7);
active = (EVSYS->INTFLAG.reg & EVSYS_INTFLAG_EVDp8(value)) != 0;
// Only clear if we know its active, otherwise there is the possibility it becomes active
// after we check but before we clear.
if (active) {
EVSYS->INTFLAG.reg = EVSYS_INTFLAG_EVDp8(value) | EVSYS_INTFLAG_OVRp8(value);
}
} else {
uint8_t value = 1 << channel;
active = (EVSYS->INTFLAG.reg & EVSYS_INTFLAG_EVD(value)) != 0;
if (active) {
EVSYS->INTFLAG.reg = EVSYS_INTFLAG_EVD(value) | EVSYS_INTFLAG_OVR(value);
}
}
#endif
#ifdef SAMD51
active = EVSYS->Channel[channel].CHINTFLAG.bit.EVD;
// Only clear if we know its active, otherwise there is the possibility it becomes after we
// check but before we clear.
if (active) {
EVSYS->Channel[channel].CHINTFLAG.reg = EVSYS_CHINTFLAG_EVD;
}
#endif
return active;
}