157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/****************************************************************************
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* boards/risc-v/fe310/hifive1-revb/src/fe310_buttons.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/board.h>
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#include <nuttx/arch.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <assert.h>
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#include <debug.h>
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#include <errno.h>
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#include "fe310_gpio.h"
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#include "fe310.h"
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#include "hifive1-revb.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define GPIO_BTN (GPIO_MODE_INIRQ | GPIO_INT_BOTH | GPIO_PULLUP | GPIO_PIN23)
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#define BTN_IRQ FE310_IRQ_GPIO23
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_button_initialize
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*
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* Description:
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* board_button_initialize() must be called to initialize button resources.
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* After that, board_buttons() may be called to collect the current state
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* of all buttons or board_button_irq() may be called to register button
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* interrupt handlers.
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*
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****************************************************************************/
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uint32_t board_button_initialize(void)
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{
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fe310_gpio_config(GPIO_BTN);
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return 1;
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}
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/****************************************************************************
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* Name: board_buttons
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*
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* Description:
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* After board_button_initialize() has been called, board_buttons() may be
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* called to collect the state of all buttons. board_buttons() returns an
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* 8-bit bit set with each bit associated with a button. See the
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* BUTTON_*_BIT definitions in board.h for the meaning of each bit.
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*
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****************************************************************************/
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uint32_t board_buttons(void)
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{
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uint8_t ret = 0;
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int i = 0;
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int n = 0;
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bool b0 = fe310_gpio_read(GPIO_BTN);
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for (i = 0; i < 10; i++)
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{
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up_mdelay(1); /* TODO */
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bool b1 = fe310_gpio_read(GPIO_BTN);
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if (b0 == b1)
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{
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n++;
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}
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else
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{
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n = 0;
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}
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if (3 == n)
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{
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break;
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}
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b0 = b1;
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}
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iinfo("b=%d n=%d\n", b0, n);
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/* Low value means that the button is pressed */
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if (!b0)
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{
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ret = 0x1;
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}
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return ret;
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}
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/****************************************************************************
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* Name: board_button_irq
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*
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* Description:
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* board_button_irq() may be called to register an interrupt handler that
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* will be called when a button is depressed or released. The ID value is
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* a button enumeration value that uniquely identifies a button resource.
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* See the BUTTON_* definitions in board.h for the meaning of enumeration
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* value.
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*
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****************************************************************************/
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#ifdef CONFIG_ARCH_IRQBUTTONS
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int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
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{
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int ret = -EINVAL;
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ASSERT(id == 0);
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if (NULL != irqhandler)
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{
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/* Attach the new button handler. */
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ret = irq_attach(BTN_IRQ, irqhandler, arg);
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/* Then make sure that interrupts are enabled on the pin */
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up_enable_irq(BTN_IRQ);
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}
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else
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{
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up_disable_irq(BTN_IRQ);
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}
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return ret;
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}
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#endif
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