/**************************************************************************** * boards/arm/stm32/olimex-stm32-h405/src/stm32_buttons.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "olimex-stm32-h405.h" #ifdef CONFIG_ARCH_BUTTONS /**************************************************************************** * Private Data ****************************************************************************/ /* Pin configuration for each Olimex-STM32-H405 button. This array is indexed * by the BUTTON_* definitions in board.h */ static const uint32_t g_buttons[NUM_BUTTONS] = { GPIO_BTN_BUT }; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: board_button_initialize * * Description: * board_button_initialize() must be called to initialize button resources. * After that, board_buttons() may be called to collect the current state * of all buttons or board_button_irq() may be called to register button * interrupt handlers. * ****************************************************************************/ uint32_t board_button_initialize(void) { int i; /* Configure the GPIO pins as inputs. NOTE that EXTI interrupts are * configured for all pins. */ for (i = 0; i < NUM_BUTTONS; i++) { stm32_configgpio(g_buttons[i]); } return NUM_BUTTONS; } /**************************************************************************** * Name: board_buttons ****************************************************************************/ uint32_t board_buttons(void) { uint32_t ret = 0; /* Check that state of each key */ if (!stm32_gpioread(g_buttons[BUTTON_BUT])) { ret |= BUTTON_BUT_BIT; } return ret; } /**************************************************************************** * Button support. * * Description: * board_button_initialize() must be called to initialize button resources. * After that, board_buttons() may be called to collect the current state * of all buttons or board_button_irq() may be called to register button * interrupt handlers. * * After board_button_initialize() has been called, board_buttons() may be * called to collect the state of all buttons. board_buttons() returns an * 32-bit bit set with each bit associated with a button. See the * BUTTON_*_BIT definitions in board.h for the meaning of each bit. * * board_button_irq() may be called to register an interrupt handler that * will be called when a button is depressed or released. The ID value is a * button enumeration value that uniquely identifies a button resource. See * the BUTTON_* definitions in board.h for the meaning of enumeration * value. * ****************************************************************************/ #ifdef CONFIG_ARCH_IRQBUTTONS int board_button_irq(int id, xcpt_t irqhandler, void *arg) { int ret = -EINVAL; /* The following should be atomic */ if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON) { ret = stm32_gpiosetevent(g_buttons[id], true, true, true, irqhandler, arg); } return ret; } #endif #endif /* CONFIG_ARCH_BUTTONS */