reflow-oven-control-sw/stm-firmware/button.c

112 lines
3.2 KiB
C

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