112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* Reflow Oven Controller
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*
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* Copyright (C) 2020 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of the Reflow Oven Controller Project.
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*
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* The reflow oven controller is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the reflow oven controller project.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stm32/stm32f4xx.h>
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#include <reflow-controller/button.h>
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#include <stm-periph/stm32-gpio-macros.h>
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#include <stm-periph/clock-enable-manager.h>
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#include <stdint.h>
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#include <helper-macros/helper-macros.h>
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#include <cmsis/core_cm4.h>
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#include <reflow-controller/systick.h>
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static volatile uint64_t IN_SECTION(.ccm.bss) to_active_timestamp;
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static volatile enum button_state IN_SECTION(.ccm.bss) int_state;
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static volatile enum button_state IN_SECTION(.ccm.bss) override_state;
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void button_init()
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{
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rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
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rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_SYSCFGEN));
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BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
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BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
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BUTTON_PORT->PUPDR |= PULLUP(BUTTON_PIN);
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to_active_timestamp = 0ULL;
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int_state = BUTTON_IDLE;
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override_state = BUTTON_IDLE;
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SYSCFG->EXTICR[1] |= 0x3;
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EXTI->IMR |= (1U<<4);
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EXTI->RTSR |= (1U<<4);
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EXTI->FTSR |= (1U<<4);
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NVIC_EnableIRQ(EXTI4_IRQn);
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}
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enum button_state button_read_event()
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{
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uint64_t time_delta;
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enum button_state temp_state;
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if (override_state != BUTTON_IDLE) {
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temp_state = override_state;
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override_state = BUTTON_IDLE;
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return temp_state;
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}
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if (BUTTON_PORT->IDR & (1U<<BUTTON_PIN)) {
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temp_state = int_state;
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int_state = BUTTON_IDLE;
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return temp_state;
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} else {
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time_delta = systick_get_global_tick() - to_active_timestamp;
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if (time_delta >= BUTTON_LONG_ON_TIME_MS)
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return BUTTON_LONG;
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else if (time_delta >= BUTTON_SHORT_ON_TIME_MS)
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return BUTTON_SHORT;
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else
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return BUTTON_IDLE;
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}
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}
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void button_deinit()
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{
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BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
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BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
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rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
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EXTI->IMR &= ~(1U<<4);
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rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_SYSCFGEN));
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}
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void EXTI4_IRQHandler(void)
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{
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uint64_t time_delta;
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/* Clear interrupts */
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EXTI->PR = EXTI->PR;
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__DSB();
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if (BUTTON_PORT->IDR & (1U<<BUTTON_PIN)) {
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time_delta = systick_get_global_tick() - to_active_timestamp;
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if (time_delta >= BUTTON_SHORT_ON_TIME_MS && time_delta < BUTTON_LONG_ON_TIME_MS) {
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int_state = BUTTON_SHORT_RELEASED;
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} else if (time_delta >= BUTTON_LONG_ON_TIME_MS) {
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int_state = BUTTON_LONG_RELEASED;
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}
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} else {
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to_active_timestamp = systick_get_global_tick();
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}
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}
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void button_override_event(enum button_state state)
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{
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override_state = state;
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}
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