marlin/Marlin/src/HAL/HAL_STM32F1/fastio_STM32F1.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 * Copyright (C) 2017 Victor Perez
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#pragma once

/**
 * Fast I/O interfaces for STM32F1
 * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
 */

#include <libmaple/gpio.h>

#define READ(IO)              (PIN_MAP[IO].gpio_device->regs->IDR & (1U << PIN_MAP[IO].gpio_bit) ? HIGH : LOW)
#define WRITE(IO,V)           (PIN_MAP[IO].gpio_device->regs->BSRR = (1U << PIN_MAP[IO].gpio_bit) << (16 * !((bool)V)))
#define TOGGLE(IO)            (PIN_MAP[IO].gpio_device->regs->ODR = PIN_MAP[IO].gpio_device->regs->ODR ^ (1U << PIN_MAP[IO].gpio_bit))
#define WRITE_VAR(IO,V)       WRITE(IO,V)

#define _GET_MODE(IO)         gpio_get_mode(PIN_MAP[IO].gpio_device, PIN_MAP[IO].gpio_bit)
#define _SET_MODE(IO,M)       gpio_set_mode(PIN_MAP[IO].gpio_device, PIN_MAP[IO].gpio_bit, M)
#define _SET_OUTPUT(IO)       _SET_MODE(IO, GPIO_OUTPUT_PP)

#define OUT_WRITE(IO,V)       do{ _SET_OUTPUT(IO); WRITE(IO,V); }while(0)

#define SET_INPUT(IO)         _SET_MODE(IO, GPIO_INPUT_FLOATING)
#define SET_INPUT_PULLUP(IO)  _SET_MODE(IO, GPIO_INPUT_PU)
#define SET_OUTPUT(IO)        OUT_WRITE(IO, LOW)
#define SET_PWM(IO)           pinMode(IO, PWM)    // do{ gpio_set_mode(PIN_MAP[pin].gpio_device, PIN_MAP[pin].gpio_bit, GPIO_AF_OUTPUT_PP); timer_set_mode(PIN_MAP[pin].timer_device, PIN_MAP[pin].timer_channel, TIMER_PWM); }while(0)

#define IS_INPUT(IO)          (_GET_MODE(IO) == GPIO_INPUT_FLOATING || _GET_MODE(IO) == GPIO_INPUT_ANALOG || _GET_MODE(IO) == GPIO_INPUT_PU || _GET_MODE(IO) == GPIO_INPUT_PD)
#define IS_OUTPUT(IO)         (_GET_MODE(IO) == GPIO_OUTPUT_PP)
#define HAS_TIMER(IO)         (PIN_MAP[IO].timer_device != nullptr)

#define PWM_PIN(P)              HAS_TIMER(P)
#define USEABLE_HARDWARE_PWM(P) PWM_PIN(P)

// digitalRead/Write wrappers
#define extDigitalRead(IO)    digitalRead(IO)
#define extDigitalWrite(IO,V) digitalWrite(IO,V)