circuitpython/ports/stm/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 "shared-bindings/alarm/pin/PinAlarm.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "peripherals/exti.h"
STATIC bool woke_up;
STATIC uint16_t alarm_pin_triggered;
STATIC bool deep_wkup_enabled;
STATIC bool reserved_alarms[STM32_GPIO_PORT_SIZE];
STATIC void pin_alarm_callback(uint8_t num) {
alarm_pin_triggered |= (1 << num);
woke_up = true;
HAL_GPIO_EXTI_IRQHandler(pin_mask(num));
}
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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) {
if (!edge) {
mp_raise_NotImplementedError(translate("Only edge detection is available on this hardware"));
}
if (!stm_peripherals_exti_is_free(pin->number)) {
mp_raise_RuntimeError(translate("Pin interrupt already in use"));
}
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = pin_mask(pin->number);
GPIO_InitStruct.Mode = value ? GPIO_MODE_IT_RISING : GPIO_MODE_IT_FALLING;
// Pull is automatically set to oppose value.
// TODO: match digitalIO API instead?
if (value) {
GPIO_InitStruct.Pull = pull ? GPIO_PULLDOWN : GPIO_NOPULL;
} else {
GPIO_InitStruct.Pull = pull ? GPIO_PULLUP : GPIO_NOPULL;
}
HAL_GPIO_Init(pin_port(pin->port), &GPIO_InitStruct);
// EXTI is set up and enabled in set_alarm
self->pin = pin;
self->value = value;
self->pull = pull;
}
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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_us_up(void) {
return woke_up;
}
mp_obj_t alarm_pin_pinalarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *alarms) {
for (size_t i = 0; i < n_alarms; i++) {
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if (!mp_obj_is_type(alarms[i], &alarm_pin_pinalarm_type)) {
continue;
}
alarm_pin_pinalarm_obj_t *alarm = MP_OBJ_TO_PTR(alarms[i]);
if (alarm_pin_triggered & (1 << alarm->pin->number)) {
return alarms[i];
}
}
// If the above isn't true, we woke from deep sleep, so create a new alarm
alarm_pin_pinalarm_obj_t *alarm = m_new_obj(alarm_pin_pinalarm_obj_t);
alarm->base.type = &alarm_pin_pinalarm_type;
// TODO: replace this if/when other WKUP pins are supported
alarm->pin = &pin_PA00;
return alarm;
}
void alarm_pin_pinalarm_reset(void) {
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HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
alarm_pin_triggered = 0;
woke_up = false;
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deep_wkup_enabled = false;
for (uint8_t i = 0; i < STM32_GPIO_PORT_SIZE; i++) {
if (reserved_alarms[i]) {
stm_peripherals_exti_reset_exti(i);
reserved_alarms[i] = false;
}
}
}
// Deep sleep alarms don't actually make use of EXTI, but we pretend they're the same.
void alarm_pin_pinalarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms) {
for (size_t i = 0; i < n_alarms; i++) {
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if (mp_obj_is_type(alarms[i], &alarm_pin_pinalarm_type)) {
alarm_pin_pinalarm_obj_t *alarm = MP_OBJ_TO_PTR(alarms[i]);
if (deep_sleep) {
// Deep sleep only wakes on a rising edge from one pin, WKUP (PA00)
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// All pin settings are handled automatically.
if (alarm->pin != &pin_PA00) {
mp_raise_ValueError(translate("Pin cannot wake from Deep Sleep"));
}
if (alarm->value == false || alarm->pull == false) {
// Enabling WakeUp automatically sets this, but warn anyway to set expectations
mp_raise_ValueError(translate("Deep sleep pins must use a rising edge with pulldown"));
}
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// We can't actually turn WakeUp on here, since enabling it disables EXTI,
// so we put it off until right before sleeping.
deep_wkup_enabled = true;
// EXTI needs to persist past the VM cleanup for fake deep sleep
stm_peripherals_exti_never_reset(alarm->pin->number);
}
if (!stm_peripherals_exti_reserve(alarm->pin->number)) {
mp_raise_RuntimeError(translate("Pin interrupt already in use"));
}
stm_peripherals_exti_set_callback(pin_alarm_callback,alarm->pin->number);
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stm_peripherals_exti_enable(alarm->pin->number);
reserved_alarms[alarm->pin->number] = true;
}
}
}
// If we don't have WKUP enabled, ensure it's disabled
// TODO; is this really required?
void alarm_pin_pinalarm_prepare_for_deep_sleep(void) {
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if (deep_wkup_enabled) {
HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
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__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
}
}