/**************************************************************************** * configs/sure-pic32mx/src/up_buttons.c * * Copyright (C) 2011 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 "chip.h" #include "up_arch.h" #include "pic32mx-internal.h" #include "pic32mx-ioport.h" #include "pic32mx-adc.h" #include "sure-internal.h" #ifdef CONFIG_ARCH_BUTTONS /**************************************************************************** * Definitions ****************************************************************************/ /* The Sure DB_DP11215 PIC32 Storage Demo Board has three buttons. * * SW1 (SW_UP, left arrow) RB3 Pulled high, Grounded/low when depressed * SW2 (SW_DOWN, down/right arrow) RB2 Pulled high, Grounded/low when depressed * SW3 (SW_OK, right arrow) RB4 Pulled high, Grounded/low when depressed * * The Sure DB-DP11212 PIC32 General Purpose Demo Board also has three buttons, * but these are connected differently: * * SW2-1 RF0 Pulled high, Grounded/low when depressed * SW3-1 RF1 Pulled high, Grounded/low when depressed * SW5-1 RD6 Pulled high, Grounded/low when depressed * * Internal pull-ups are not required since the LEDs are pull-up externally. * Change notification interrupts are not *automatically* enabled. Change * notification will be enabled when pic32mx_gpioattach() is called. */ #ifdef CONFIG_ARCH_DBDP11215 # define GPIO_SW1 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN3) # define GPIO_SW2 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN2) # define GPIO_SW3 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN4) #else /* CONFIG_ARCH_DBDP11212 */ # define GPIO_SW1 (GPIO_INPUT|GPIO_INT|GPIO_PORTF|GPIO_PIN0) # define GPIO_SW2 (GPIO_INPUT|GPIO_INT|GPIO_PORTF|GPIO_PIN1) # define GPIO_SW3 (GPIO_INPUT|GPIO_INT|GPIO_PORTD|GPIO_PIN6) #endif /* Change notification numbers: * RB3 -> CN5 * RB2 -> CN2 * RB4 -> CN6 */ #define CN_SW1 5 #define CN_SW2 2 #define CN_SW3 6 /**************************************************************************** * Private Data ****************************************************************************/ /* Pin configuration for each button */ static const uint16_t g_buttonset[NUM_BUTTONS] = { GPIO_SW1 GPIO_SW2, GPIO_SW3 } /* Change notification number for each button */ #ifdef CONFIG_ARCH_IRQBUTTONS static const uint8_t g_buttoncn[NUM_BUTTONS] = { CN_SW1, CN_SW2, CN_SW3 } #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: up_buttoninit * * Description: * up_buttoninit() must be called to initialize button resources. After * that, up_buttons() may be called to collect the current state of all * buttons or up_irqbutton() may be called to register button interrupt * handlers. * ****************************************************************************/ void up_buttoninit(void) { int i; /* Configure input pins */ for (i = 0; i < NUM_BUTTONS; i++) { pic32mx_configgpio(g_buttonset[i]); } /* Change AN2/AN3/AN4 to digital */ putreg32(0xffff, PIC32MX_ADC_CFG); } /**************************************************************************** * Name: up_buttons ****************************************************************************/ uint8_t up_buttons(void) { uint8_t ret = 0; int id; /* Configure input pins */ for (id = 0; id < NUM_BUTTONS; id++) { if (pic32mx_gpioread(g_buttonset[id])) { ret |= (1 << id); } } return ret; } /************************************************************************************ * Button support. * * Description: * up_buttoninit() must be called to initialize button resources. After * that, up_buttons() may be called to collect the current state of all * buttons or up_irqbutton() may be called to register button interrupt * handlers. * * After up_buttoninit() has been called, up_buttons() may be called to * collect the state of all buttons. up_buttons() returns an 8-bit bit set * with each bit associated with a button. See the BUTTON_*_BIT and JOYSTICK_*_BIT * definitions in board.h for the meaning of each bit. * * up_irqbutton() 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_* and JOYSTICK_* definitions in board.h for the meaning of enumeration * value. The previous interrupt handler address is returned (so that it may * restored, if so desired). * * Interrupts are automatically enabled when the button handler is attached and * automatically disabled when the button handler is detached. * * When an interrupt occurs, it is due to a change on the GPIO input pin * associated with the button. In that case, all attached change * notification handlers will be called. Each handler must maintain state * and determine if the unlying GPIO button input value changed. * ************************************************************************************/ #ifdef CONFIG_ARCH_IRQBUTTONS xcpt_t up_irqbutton(int id, xcpt_t irqhandler) { xcpt_t oldhandler = NULL; if (id < NUM_BUTTONS) { oldhandler = pic32mx_gpioattach(g_buttonset[id], g_buttoncn[id], irqhandler); if (irqbuttron) { pic32mx_gpioirqenable(g_buttoncn[id]); } } return oldhandler; } #endif #endif /* CONFIG_ARCH_BUTTONS */