/**************************************************************************** * configs/stm3220g-eval/src/stm32_buttons.c * * Copyright (C) 2012, 2014-2015, 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "stm3220g-eval.h" #ifdef CONFIG_ARCH_BUTTONS /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /* Pin configuration for each STM3210E-EVAL button. This array is indexed by * the BUTTON_* and JOYSTICK_* definitions in board.h */ static const uint32_t g_buttons[NUM_BUTTONS] = { GPIO_BTN_WAKEUP, GPIO_BTN_TAMPER, GPIO_BTN_USER }; /**************************************************************************** * 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. * ****************************************************************************/ void 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]); } } /**************************************************************************** * Name: board_buttons ****************************************************************************/ uint8_t board_buttons(void) { uint8_t ret = 0; int i; /* Check that state of each key */ for (i = 0; i < NUM_BUTTONS; i++) { /* A LOW value means that the key is pressed for most keys. The exception * is the WAKEUP button. */ bool released = stm32_gpioread(g_buttons[i]); if (i == BUTTON_WAKEUP) { released = !released; } /* Accumulate the set of depressed (not released) keys */ if (!released) { ret |= (1 << i); } } 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 8-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, FAR void *arg) { xcpt_t oldhandler = NULL; /* The following should be atomic */ if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON) { oldhandler = stm32_gpiosetevent(g_buttons[id], true, true, true, irqhandler, arg); } UNUSED(oldhandler); return OK; } #endif #endif /* CONFIG_ARCH_BUTTONS */