/**************************************************************************** * configs/sama5d3-xplained/src/sam_buttons.c * * Copyright (C) 2014 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. * ****************************************************************************/ /* There are five push button switches on the SAMA5D3-Xplained base board: * * 1. One Reset, board reset (BP1) * 2. One Wake up, push button to bring the processor out of low power mode * (BP2) * 3. One User momentary Push Button * 4. One Disable CS Push Button * * Only the momentary push button is controllable by software (labeled * "PB_USER1" on the board): * * - PE27. Pressing the switch connect PE27 to grounded. Therefore, PE27 * must be pulled high internally. When the button is pressed the SAMA5 * will sense "0" is on PE27. */ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "sam_pio.h" #include "sama5d3-xplained.h" #ifdef CONFIG_ARCH_BUTTONS /**************************************************************************** * Definitions ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ #if defined(CONFIG_SAMA5_PIOE_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS) static xcpt_t g_irquser1; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * 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) { (void)sam_configpio(PIO_USER); } /**************************************************************************** * Name: board_buttons * * Description: * 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* * definitions above for the meaning of each bit in the returned value. * ****************************************************************************/ uint8_t board_buttons(void) { return sam_pioread(PIO_USER) ? 0 : BUTTON_USER_BIT; } /**************************************************************************** * Name: board_button_irq * * Description: * This function may be called to register an interrupt handler that will * be called when a button is depressed or released. The ID value is one * of the BUTTON* definitions provided above. The previous interrupt * handler address isreturned (so that it may restored, if so desired). * * Configuration Notes: * Configuration CONFIG_SAMA5_PIO_IRQ must be selected to enable the * overall PIO IRQ feature and CONFIG_SAMA5_PIOE_IRQ must be enabled to * select PIOs to support interrupts on PIOE. * ****************************************************************************/ #if defined(CONFIG_SAMA5_PIOE_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS) xcpt_t board_button_irq(int id, xcpt_t irqhandler) { xcpt_t oldhandler = NULL; if (id == BUTTON_USER) { irqstate_t flags; /* Disable interrupts until we are done. This guarantees that the * following operations are atomic. */ flags = irqsave(); /* Get the old button interrupt handler and save the new one */ oldhandler = g_irquser1; g_irquser1 = irqhandler; /* Configure the interrupt */ sam_pioirq(IRQ_USER1); (void)irq_attach(IRQ_USER1, irqhandler); sam_pioirqenable(IRQ_USER1); irqrestore(flags); } /* Return the old button handler (so that it can be restored) */ return oldhandler; } #endif #endif /* CONFIG_ARCH_BUTTONS */