diff options
author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-03-10 00:15:45 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-03-10 00:15:45 +0000 |
commit | a50ae367b480371a0eefd6efe83f7d46e61b71a7 (patch) | |
tree | bc6c3135f9f82e6fefbd1408a4a0dc9e149d4a7a /nuttx/configs/stm3220g-eval/src/up_buttons.c | |
parent | 58914ea2eec69cf5a4243bc7e579bd29d92e9c27 (diff) |
Add support for the STM3220G-EVAL board
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4472 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/configs/stm3220g-eval/src/up_buttons.c')
-rw-r--r-- | nuttx/configs/stm3220g-eval/src/up_buttons.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/nuttx/configs/stm3220g-eval/src/up_buttons.c b/nuttx/configs/stm3220g-eval/src/up_buttons.c new file mode 100644 index 0000000000..03cb57dbde --- /dev/null +++ b/nuttx/configs/stm3220g-eval/src/up_buttons.c @@ -0,0 +1,170 @@ +/**************************************************************************** + * configs/stm3220g-eval/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 <arch/board/board.h> +#include "stm3220g-internal.h" + +#ifdef CONFIG_ARCH_BUTTONS + +/**************************************************************************** + * 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 uint16_t g_buttons[NUM_BUTTONS] = +{ + GPIO_BTN_WAKEUP, GPIO_BTN_TAMPER, GPIO_BTN_USER +}; + +/**************************************************************************** + * 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. NOTE that EXTI interrupts are + * configured for all pins. + */ + + for (i = 0; i < NUM_BUTTONS; i++) + { + stm32_configgpio(g_buttons[i]); + } +} + +/**************************************************************************** + * Name: up_buttons + ****************************************************************************/ + +uint8_t up_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: + * 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 + * 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_* 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). + * + ************************************************************************************/ + +#ifdef CONFIG_ARCH_IRQBUTTONS +xcpt_t up_irqbutton(int id, xcpt_t irqhandler) +{ + 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); + } + return oldhandler; +} +#endif +#endif /* CONFIG_ARCH_BUTTONS */ |