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Diffstat (limited to 'nuttx/configs/olimex-lpc1766stk/src/up_buttons.c')
| -rw-r--r-- | nuttx/configs/olimex-lpc1766stk/src/up_buttons.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/nuttx/configs/olimex-lpc1766stk/src/up_buttons.c b/nuttx/configs/olimex-lpc1766stk/src/up_buttons.c new file mode 100644 index 000000000..65fe89dfc --- /dev/null +++ b/nuttx/configs/olimex-lpc1766stk/src/up_buttons.c @@ -0,0 +1,201 @@ +/**************************************************************************** + * configs/olimex-lpc1766stk/src/up_buttons.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <nuttx/config.h> + +#include <stdint.h> + +#include <nuttx/irq.h> + +#include <arch/board/board.h> +#include "lpc1766stk_internal.h" + +#ifdef CONFIG_ARCH_BUTTONS + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ +/* Pin configuration for each STM3210E-EVAL button. This array is indexed by + * the BUTTON_* and JOYSTICK_* definitions in board.h + */ + +static const uint16_t g_buttoncfg[BOARD_NUM_BUTTONS] = +{ + LPC1766STK_BUT1, LPC1766STK_BUT2, LPC1766STK_WAKEUP, LPC1766STK_CENTER, + LPC1766STK_UP, LPC1766STK_DOWN, LPC1766STK_LEFT, LPC1766STK_RIGHT +}; + +/* This array defines all of the interupt handlers current attached to + * button events. + */ + +#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ) +static xcpt_t g_buttonisr[BOARD_NUM_BUTTONS]; + +/* This array provides the mapping from button ID numbers to button IRQ + * numbers. + */ + +static uint8_t g_buttonirq[BOARD_NUM_BUTTONS] = +{ + LPC1766STK_BUT1_IRQ, LPC1766STK_BUT2_IRQ, LPC1766STK_WAKEUP_IRQ, + LPC1766STK_CENTER_IRQ, LPC1766STK_UP_IRQ, LPC1766STK_DOWN_IRQ, + LPC1766STK_LEFT_IRQ, LPC1766STK_RIGHT_IRQ +}; +#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 the GPIO pins as inputs. */ + + for (i = 0; i < BOARD_NUM_BUTTONS; i++) + { + lpc17_configgpio(g_buttoncfg[i]); + } +} + +/**************************************************************************** + * Name: up_buttons + * + * Description: + * up_buttons() may be called at any time to harvest the state of every + * button. The state of the buttons is returned as a bitset with one + * bit corresponding to each button: If the bit is set, then the button + * is pressed. See the BOARD_BUTTON_*_BIT and BOARD_JOYSTICK_*_BIT + * definitions in board.h for the meaning of each bit. + * + ****************************************************************************/ + +uint8_t up_buttons(void) +{ + uint8_t ret = 0; + int i; + + /* Check that state of each key */ + + for (i = 0; i < BOARD_NUM_BUTTONS; i++) + { + /* A LOW value means that the key is pressed. */ + + bool released = lpc17_gpioread(g_buttoncfg[i]); + + /* Accumulate the set of depressed (not released) keys */ + + if (!released) + { + ret |= (1 << i); + } + } + + 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. + * + * 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 + * BOARD_BUTTON_* and BOARD_JOYSTICK_* definitions in board.h for the meaning + * of enumeration values. The previous interrupt handler address is returned + * (so that it may restored, if so desired). + * + ************************************************************************************/ + +#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ) +xcpt_t up_irqbutton(int id, xcpt_t irqhandler) +{ + xcpt_t oldhandler = NULL; + irqstate_t flags; + + /* Verify that the button ID is within range */ + + if ((unsigned)id < BOARD_NUM_BUTTONS) + { + /* Return the current button handler and set the new interrupt handler */ + + oldhandler = g_buttonisr[id]; + g_buttonisr = irqhandler; + + /* Disable interrupts until we are done */ + + flags = irqsave(); + + /* Configure the interrupt */ + + (void)irq_attach(g_buttonirq[id], irqhandler); + up_enable_irq(g_buttonirq[id]); + irqrestore(flags); + } + return oldhandler; +} +#endif + +#endif /* CONFIG_ARCH_BUTTONS */ |