// Copyright 2013 Emilie Gillet. // // Author: Emilie Gillet (emilie.o.gillet@gmail.com) // // 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. // // See http://creativecommons.org/licenses/MIT/ for more information. // // ----------------------------------------------------------------------------- // // Driver for rotary encoder. #include "midi2cv/drivers/encoder.h" #include "stm32f3xx_hal_gpio.h" void Encoder::Init() { __HAL_RCC_GPIOC_CLK_ENABLE(); GPIO_InitTypeDef gpio_init; gpio_init.Pin = GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15; gpio_init.Speed = GPIO_SPEED_FREQ_MEDIUM; gpio_init.Mode = GPIO_MODE_INPUT; gpio_init.Pull = GPIO_PULLUP; HAL_GPIO_Init(GPIOC, &gpio_init); switch_state_ = 0xff; quadrature_decoding_state_[0] = quadrature_decoding_state_[1] = 0xff; } void Encoder::Debounce() { switch_state_ = (switch_state_ << 1) | HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_15); quadrature_decoding_state_[0] = (quadrature_decoding_state_[0] << 1) | HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13); quadrature_decoding_state_[1] = (quadrature_decoding_state_[1] << 1) | HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_14); }