circuitpython/ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Lucian Copeland 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 "py/runtime.h"
#include "samd/external_interrupts.h"
#include "eic_handler.h"
#include "atmel_start_pins.h"
#include "hal/include/hal_gpio.h"
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// #include <stdio.h>
#include "shared-bindings/alarm/pin/PinAlarm.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "common-hal/alarm/__init__.h"
// This variable stores whether a PinAlarm woke in light sleep or fake deep sleep
// It CANNOT detect if the program woke from deep sleep.
STATIC volatile bool woke_up;
// TODO: replace pinalarm_on with SAMD_ALARM_FLAG bit flags
STATIC volatile bool pinalarm_on;
// TODO: Create tables here reserving IRQ instances, and for the IRQ
// callback to store what pin triggered the interrupt
// STATIC bool reserved_alarms[SOME_VAL];
// STATIC uint16_t triggered_pins[SOME_VAL];
void pin_alarm_callback(uint8_t num) { // parameters can be changed
// TODO: This is responsible for resetting the IRQ (so it doesn't
// go off constantly, and recording what pin was responsible for
// the trigger. This will only work for light sleep/fake deep
// sleep, in conjunction with the find_triggered_alarm function
if (pinalarm_on) {
// clear flag and interrupt setting
RTC->MODE0.INTENCLR.reg = RTC_MODE0_INTENCLR_TAMPER;
pinalarm_on = false;
// QUESTION: How to reference the correct EIC?
// set_eic_handler(self->channel, EIC_HANDLER_NO_INTERRUPT);
// turn_off_eic_channel(self->channel);
// reset_pin_number(self->pin);
woke_up = true;
}
}
void common_hal_alarm_pin_pinalarm_construct(alarm_pin_pinalarm_obj_t *self, const mcu_pin_obj_t *pin, bool value, bool edge, bool pull) {
// Tamper Pins: IN0:PB00; IN1:PB02; IN2:PA02; IN3:PC00; IN4:PC01; OUT:PB01
// TODO: Catch edge or level mode if not supported
if (!pin->has_extint) {
mp_raise_RuntimeError(translate("No hardware support on pin"));
}
if (eic_get_enable()) {
if (!eic_channel_free(pin->extint_channel)) {
mp_raise_RuntimeError(translate("A hardware interrupt channel is already in use"));
}
} else {
turn_on_external_interrupt_controller();
}
// TODO: determine if pin has an interrupt channel available
// TODO: set pin pull settings, input/output, etc
// QUESTION: can PORT/EVSYS interrupts (lightsleep) coexist with RTC->TAMPER (deepsleep) settings?
// Actual initialization of the interrupt should be delayed until set_alarm
self->channel = pin->extint_channel;
self->pin = pin;
self->value = value;
self->pull = pull;
gpio_set_pin_function(pin->number, GPIO_PIN_FUNCTION_A);
if (self->pull) {
if (self->value) {
// detect rising edge means pull down
gpio_set_pin_pull_mode(pin->number, GPIO_PULL_DOWN);
} else {
// detect falling edge means pull up
gpio_set_pin_pull_mode(pin->number, GPIO_PULL_UP);
}
}
set_eic_channel_data(self->channel, (void *)self);
claim_pin(self->pin);
}
const mcu_pin_obj_t *common_hal_alarm_pin_pinalarm_get_pin(alarm_pin_pinalarm_obj_t *self) {
return self->pin;
}
bool common_hal_alarm_pin_pinalarm_get_value(alarm_pin_pinalarm_obj_t *self) {
return self->value;
}
bool common_hal_alarm_pin_pinalarm_get_edge(alarm_pin_pinalarm_obj_t *self) {
return true;
}
bool common_hal_alarm_pin_pinalarm_get_pull(alarm_pin_pinalarm_obj_t *self) {
return self->pull;
}
bool alarm_pin_pinalarm_woke_this_cycle(void) {
if (pinalarm_on && RTC->MODE0.INTFLAG.bit.TAMPER) {
woke_up = true;
}
return woke_up;
}
mp_obj_t alarm_pin_pinalarm_find_triggered_alarm(size_t n_alarms, const mp_obj_t *alarms) {
for (size_t i = 0; i < n_alarms; i++) {
if (!mp_obj_is_type(alarms[i], &alarm_pin_pinalarm_type)) {
continue;
}
alarm_pin_pinalarm_obj_t *alarm = MP_OBJ_TO_PTR(alarms[i]);
(void)alarm;
// TODO: Determine whether any pins have been marked as
// triggering the alarm (using the static vars at
// start of file) and if so return that alarm.
}
// Return nothing if no matching alarms are found.
return mp_const_none;
}
mp_obj_t alarm_pin_pinalarm_create_wakeup_alarm(void) {
alarm_pin_pinalarm_obj_t *alarm = m_new_obj(alarm_pin_pinalarm_obj_t);
alarm->base.type = &alarm_pin_pinalarm_type;
// TODO: Extract information about what pin woke the device.
// Because this interrupt occurs in deep sleep, the callback
// cannot be used to store this information. It must be extracted
// from the registers, if possible. It may be impossible to
// obtain, in which case return a dummy value.
return alarm;
}
void alarm_pin_pinalarm_reset(void) {
// TODO: this is responsible for resetting ALL pinalarms. Make
// sure to clear any reserved tables, deinit both PORT and TAMPER
// settings, etc. If flags are set to indicate this module is in
// use, reset them.
pinalarm_on = false;
woke_up = false;
SAMD_ALARM_FLAG &= ~SAMD_ALARM_FLAG_PIN; // clear flag
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// Disable TAMPER interrupt
RTC->MODE0.INTENCLR.reg = RTC_MODE0_INTENCLR_TAMPER;
// Disable TAMPER control
common_hal_mcu_disable_interrupts();
RTC->MODE0.CTRLA.bit.ENABLE = 0; // Disable the RTC
while (RTC->MODE0.SYNCBUSY.bit.ENABLE) { // Wait for synchronization
;
}
RTC->MODE0.TAMPCTRL.reg = 0; // reset everything
RTC->MODE0.CTRLA.bit.ENABLE = 1; // Enable the RTC
while (RTC->MODE0.SYNCBUSY.bit.ENABLE) { // Wait for synchronization
;
}
common_hal_mcu_enable_interrupts();
}
void alarm_pin_pinalarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms) {
// The outer layer of this loop simply checks if there are any pin
// alarms in the parameter array
for (size_t i = 0; i < n_alarms; i++) {
if (mp_obj_is_type(alarms[i], &alarm_pin_pinalarm_type)) {
alarm_pin_pinalarm_obj_t *alarm = MP_OBJ_TO_PTR(alarms[i]);
gpio_set_pin_function(alarm->pin->number, GPIO_PIN_FUNCTION_A);
if (alarm->pull) {
if (alarm->value) {
// detect rising edge means pull down
gpio_set_pin_pull_mode(alarm->pin->number, GPIO_PULL_DOWN);
} else {
// detect falling edge means pull up
gpio_set_pin_pull_mode(alarm->pin->number, GPIO_PULL_UP);
}
}
if (deep_sleep) {
// Tamper Pins: IN0:PB00; IN1:PB02; IN2:PA02; IN3:PC00; IN4:PC01; OUT:PB01
// Only these pins can do TAMPER
if (
#ifdef PIN_PB00
alarm->pin != &pin_PB00
#else
true
#endif
#ifdef PIN_PB02
&& alarm->pin != &pin_PB02
#endif
&& alarm->pin != &pin_PA02) {
mp_raise_ValueError(translate("Pin cannot wake from Deep Sleep"));
}
pinalarm_on = true;
SAMD_ALARM_FLAG |= SAMD_ALARM_FLAG_PIN;
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// Set tamper interrupt so deep sleep knows that's the intent
RTC->MODE0.INTENSET.reg = RTC_MODE0_INTENSET_TAMPER;
common_hal_mcu_disable_interrupts();
RTC->MODE0.CTRLA.bit.ENABLE = 0; // Disable the RTC
while (RTC->MODE0.SYNCBUSY.bit.ENABLE) { // Wait for synchronization
;
}
// TODO: map requested pin to limited selection of TAMPER pins
// PA02 is n=2: IN2, LVL2, etc...
RTC->MODE0.TAMPCTRL.bit.DEBNC2 = 1; // Edge triggered when INn is stable for 4 CLK_RTC_DEB periods
RTC->MODE0.TAMPCTRL.bit.TAMLVL2 = alarm->value; // rising or falling edge
RTC->MODE0.TAMPCTRL.bit.IN2ACT = 1; // WAKE on IN2 (doesn't save timestamp)
common_hal_mcu_enable_interrupts();
RTC->MODE0.INTENSET.reg = RTC_MODE0_INTENSET_TAMPER;
RTC->MODE0.CTRLA.bit.ENABLE = 1; // Enable the RTC
while (RTC->MODE0.SYNCBUSY.bit.ENABLE) { // Wait for synchronization
;
}
// TODO: Set up deep sleep alarms.
// For deep sleep alarms, first check if the
// alarm pin value is valid for RTC->TAMPER. Ensure
// that the PULL and VALUE values are possible to
// implement with TAMPER, and throw value errors if
// not.
// A VM reset will occur before deep sleep
// starts, so either init these settings now and
// protect them with a `never_reset` function, or
// store them all in static variables and only
// actually implement the settings in
// `alarm_pin_pinalarm_prepare_for_deep_sleep`
// below.
} // use else-if here if RTC-TAMPER can wake from IDLE
else {
// Light sleep so turn on EIC channel
set_eic_handler(alarm->channel, EIC_HANDLER_ALARM);
turn_on_eic_channel(alarm->channel, EIC_CONFIG_SENSE0_RISE_Val);
}
// TODO: Set up light sleep / fake deep sleep alarms.
// PORT/EVSYS should have more valid pin combinations
// than the TAMPER system. Check if there is a valid
// PORT/EVSYS combination, set it up, and reserve it with
// the tables at the start of this file so it can't be
// reused. Also set up IRQ callbacks and any other
// busywork.
// TODO: Might want to reserve or otherwise interact with
// peripherals/sam_d5x/external_interrupts.c or events.c here
// TODO: Even if an alarm is being set for deep sleep, it
// still needs to be able to wake from fake deep sleep,
// which is actually just like a light sleep. If the
// RTC Tamper IRQs are capable of waking from IDLE mode,
// this isn't a big deal, and there can be a strict
// if-else statement here. Otherwise, it will need to
// either set PORT and TAMPER IRQs simultaniously, or if that
// isn't possible, make a new function that can shunt fake deep
// sleep setup to common_hal_alarm_pretending_deep_sleep
}
}
}
void alarm_pin_pinalarm_prepare_for_deep_sleep(void) {
// TODO: This function is called after the VM reset, right before
// the program actually enters deep sleep. If the VM reset
// (see port_reset) resets any pins/EVSYS settings/RTC values
// needed by the pinalarms, this function is responsible for setting them
// back up again.
}