91 lines
2.8 KiB
C
91 lines
2.8 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 <reflow-controller/rotary-encoder.h>
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#include <stm-periph/clock-enable-manager.h>
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#include <stm-periph/stm32-gpio-macros.h>
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#include <helper-macros/helper-macros.h>
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static inline void rotary_encoder_setup_pins(void)
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{
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rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_RCC_MASK));
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ROTARY_ENCODER_PORT->MODER &= MODER_DELETE(ROTARY_ENCODER_PIN1) & MODER_DELETE(ROTARY_ENCODER_PIN2);
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ROTARY_ENCODER_PORT->MODER |= ALTFUNC(ROTARY_ENCODER_PIN1) | ALTFUNC(ROTARY_ENCODER_PIN2);
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SETAF(ROTARY_ENCODER_PORT, ROTARY_ENCODER_PIN1, ROTARY_ENCODER_PORT_ALTFUNC);
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SETAF(ROTARY_ENCODER_PORT, ROTARY_ENCODER_PIN2, ROTARY_ENCODER_PORT_ALTFUNC);
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}
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void rotary_encoder_setup(void)
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{
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rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_TIMER_RCC_MASK));
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rotary_encoder_setup_pins();
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ROTARY_ENCODER_TIMER->ARR = 0xFFFF;
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ROTARY_ENCODER_TIMER->CNT = 0;
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ROTARY_ENCODER_TIMER->CR2 = 0;
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ROTARY_ENCODER_TIMER->SMCR = TIM_SMCR_SMS_0 | TIM_SMCR_SMS_1;
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ROTARY_ENCODER_TIMER->CCMR1 = TIM_CCMR1_CC1S_0 | TIM_CCMR1_CC2S_0;
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ROTARY_ENCODER_TIMER->CCER = TIM_CCER_CC1P | TIM_CCER_CC2P;
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ROTARY_ENCODER_TIMER->PSC = 0;
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ROTARY_ENCODER_TIMER->CR1 = TIM_CR1_CEN;
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}
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uint32_t rotary_encoder_get_abs_val(void)
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{
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return (uint32_t)ROTARY_ENCODER_TIMER->CNT;
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}
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int32_t rotary_encoder_get_change_val(void)
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{
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static uint32_t last_val = 0;
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uint32_t val;
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int32_t diff;
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val = rotary_encoder_get_abs_val();
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diff = val - last_val;
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if (val > last_val) {
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if (diff > (0xFFFF/2))
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diff = -(last_val + 0x10000-val);
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} else {
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if (ABS(diff) > (0xFFFF/2))
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diff = 0x10000 - last_val + val;
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}
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last_val = val;
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return diff;
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}
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void rotary_encoder_stop(void)
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{
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ROTARY_ENCODER_TIMER->CR1 = 0;
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ROTARY_ENCODER_TIMER->CR2 = 0;
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ROTARY_ENCODER_TIMER->ARR = 0;
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rcc_manager_disable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_TIMER_RCC_MASK));
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rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_RCC_MASK));
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}
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void rotary_encoder_zero(void)
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{
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ROTARY_ENCODER_TIMER->CNT = 0UL;
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}
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