kopia lustrzana https://github.com/OpenRTX/OpenRTX
106 wiersze
3.6 KiB
C
106 wiersze
3.6 KiB
C
/***************************************************************************
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* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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 this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <interfaces/platform.h>
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#include <peripherals/gpio.h>
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#include <hwconfig.h>
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#include <qdec.h>
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#include "chSelector.h"
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static uint8_t last_state = 0; /* State storage */
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static int8_t knob_pos = 0; /* Knob position */
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/* Name of interrupt handler is mangled for C++ compatibility */
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void _Z20EXTI15_10_IRQHandlerv()
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{
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if(EXTI->PR & (EXTI_PR_PR11 | EXTI_PR_PR14))
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{
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/* Clear interrupt flags */
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EXTI->PR = EXTI_PR_PR11 | EXTI_PR_PR14;
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/* Read curent pin state */
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uint8_t pin_state = (gpio_readPin(CH_SELECTOR_1) << 1)
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| gpio_readPin(CH_SELECTOR_0);
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/* Look up next state */
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uint8_t next_state = HALF_STEP_STATE_TRANSITIONS[last_state][pin_state];
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/* update state for next call */
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last_state = next_state & QDECODER_STATE_BITMASK;
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/* Mask out events to switch on */
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uint8_t event = next_state & QDECODER_EVENT_BITMASK;
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/* Update knob_pos variable */
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switch(event)
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{
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case QDECODER_EVENT_CW:
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knob_pos++;
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break;
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case QDECODER_EVENT_CCW:
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knob_pos--;
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break;
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default:
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break;
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}
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}
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}
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void chSelector_init()
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{
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gpio_setMode(CH_SELECTOR_0, INPUT_PULL_UP);
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gpio_setMode(CH_SELECTOR_1, INPUT_PULL_UP);
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/*
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* Configure GPIO interrupts: encoder signal is on PB11 and PE14
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*/
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EXTI->IMR |= EXTI_IMR_MR11 | EXTI_IMR_MR14;
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EXTI->RTSR |= EXTI_RTSR_TR11 | EXTI_RTSR_TR14;
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EXTI->FTSR |= EXTI_FTSR_TR11 | EXTI_FTSR_TR14;
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SYSCFG->EXTICR[2] |= SYSCFG_EXTICR3_EXTI11_PB;
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SYSCFG->EXTICR[3] |= SYSCFG_EXTICR4_EXTI14_PE;
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NVIC_ClearPendingIRQ(EXTI15_10_IRQn);
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NVIC_SetPriority(EXTI15_10_IRQn, 15);
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NVIC_EnableIRQ(EXTI15_10_IRQn);
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}
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void chSelector_terminate()
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{
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EXTI->IMR &= ~(EXTI_IMR_MR1 | EXTI_IMR_MR14);
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NVIC_DisableIRQ(EXTI15_10_IRQn);
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}
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/*
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* This function is defined in platform.h
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*/
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int8_t platform_getChSelector()
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{
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/*
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* The knob_pos variable is set in the EXTI15_10 interrupt handler
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* this is safe because interrupt nesting is not allowed.
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*/
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return knob_pos;
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}
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