330 lines
9.3 KiB
C
330 lines
9.3 KiB
C
/****************************************************************************
|
|
* boards/arm/lpc17xx_40xx/open1788/src/lpc17_40_djoystick.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/input/djoystick.h>
|
|
|
|
#include "lpc17_40_gpio.h"
|
|
#include "open1788.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* The Open1788 supports several buttons.
|
|
* All will read "1" when open and "0" when closed
|
|
*
|
|
* USER1 Connected to P4[26]
|
|
* USER2 Connected to P2[22]
|
|
* USER3 Connected to P0[10]
|
|
*
|
|
* And a Joystick
|
|
*
|
|
* JOY_A Connected to P2[25]
|
|
* JOY_B Connected to P2[26]
|
|
* JOY_C Connected to P2[23]
|
|
* JOY_D Connected to P2[19]
|
|
* JOY_CTR Connected to P0[14]
|
|
*
|
|
* The switches are all connected to ground and should be pulled up and
|
|
* sensed with a value of '0' when closed.
|
|
*
|
|
* Mapping to DJOYSTICK buttons:
|
|
*
|
|
* DJOY_UP JOY_B
|
|
* DJOY_DOWN JOY_C
|
|
* DJOY_LEFT JOY_A
|
|
* DJOY_RIGHT JOY_D
|
|
* DJOY_BUTTON_1 JOY_CTR
|
|
* DJOY_BUTTON_2 USER1
|
|
* DJOY_BUTTON_3 USER2
|
|
* DJOY_BUTTON_4 USER3
|
|
*/
|
|
|
|
/* Number of Joystick discretes */
|
|
|
|
#define DJOY_NGPIOS 8
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
static djoy_buttonset_t djoy_supported(
|
|
FAR const struct djoy_lowerhalf_s *lower);
|
|
static djoy_buttonset_t djoy_sample(
|
|
FAR const struct djoy_lowerhalf_s *lower);
|
|
static void djoy_enable(FAR const struct djoy_lowerhalf_s *lower,
|
|
djoy_buttonset_t press, djoy_buttonset_t release,
|
|
djoy_interrupt_t handler, FAR void *arg);
|
|
|
|
static void djoy_disable(void);
|
|
static int djoy_interrupt(int irq, FAR void *context, FAR void *arg);
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* Pin configuration for each Open1788 joystick "button." Indexed using
|
|
* DJOY_* definitions in include/nuttx/input/djoystick.h.
|
|
*/
|
|
|
|
static const lpc17_40_pinset_t g_joygpio[DJOY_NGPIOS] =
|
|
{
|
|
GPIO_JOY_B, GPIO_JOY_C, GPIO_JOY_A, GPIO_JOY_D,
|
|
GPIO_JOY_CTR, GPIO_USER1, GPIO_USER2, GPIO_USER3
|
|
};
|
|
|
|
#ifdef CONFIG_LPC17_40_GPIOIRQ
|
|
/* This array provides the mapping from button ID numbers to button IRQ
|
|
* numbers. Indexed using DJOY_* definitions in
|
|
* include/nuttx/input/djoystick.h.
|
|
*/
|
|
|
|
static const uint8_t g_buttonirq[DJOY_NGPIOS] =
|
|
{
|
|
GPIO_JOY_B_IRQ, GPIO_JOY_C_IRQ, GPIO_JOY_A_IRQ, GPIO_JOY_D_IRQ,
|
|
GPIO_JOY_CTR_IRQ, 0, GPIO_USER2_IRQ, GPIO_USER3_IRQ
|
|
};
|
|
#endif
|
|
|
|
/* Current interrupt handler and argument */
|
|
|
|
static djoy_interrupt_t g_djoyhandler;
|
|
static FAR void *g_djoyarg;
|
|
|
|
/* This is the discrete joystick lower half driver interface */
|
|
|
|
static const struct djoy_lowerhalf_s g_djoylower =
|
|
{
|
|
.dl_supported = djoy_supported,
|
|
.dl_sample = djoy_sample,
|
|
.dl_enable = djoy_enable,
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: djoy_supported
|
|
*
|
|
* Description:
|
|
* Return the set of buttons supported on the discrete joystick device
|
|
*
|
|
****************************************************************************/
|
|
|
|
static djoy_buttonset_t djoy_supported(
|
|
FAR const struct djoy_lowerhalf_s *lower)
|
|
{
|
|
iinfo("Supported: %02x\n", DJOY_ALLBITS);
|
|
return (djoy_buttonset_t)DJOY_ALLBITS;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: djoy_sample
|
|
*
|
|
* Description:
|
|
* Return the current state of all discrete joystick buttons
|
|
*
|
|
****************************************************************************/
|
|
|
|
static djoy_buttonset_t djoy_sample(FAR const struct djoy_lowerhalf_s *lower)
|
|
{
|
|
djoy_buttonset_t ret = 0;
|
|
int i;
|
|
|
|
/* Read each joystick GPIO value */
|
|
|
|
for (i = 0; i < DJOY_NGPIOS; i++)
|
|
{
|
|
/* A LOW value means that the key is pressed. */
|
|
|
|
bool released = lpc17_40_gpioread(g_joygpio[i]);
|
|
|
|
/* Accumulate the set of depressed (not released) keys */
|
|
|
|
if (!released)
|
|
{
|
|
ret |= (1 << i);
|
|
}
|
|
}
|
|
|
|
iinfo("Returning: %02x\n", DJOY_ALLBITS);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: djoy_enable
|
|
*
|
|
* Description:
|
|
* Enable interrupts on the selected set of joystick buttons. And empty
|
|
* set will disable all interrupts.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void djoy_enable(FAR const struct djoy_lowerhalf_s *lower,
|
|
djoy_buttonset_t press, djoy_buttonset_t release,
|
|
djoy_interrupt_t handler, FAR void *arg)
|
|
{
|
|
#ifdef CONFIG_LPC17_40_GPIOIRQ
|
|
irqstate_t flags;
|
|
djoy_buttonset_t either = press | release;
|
|
int irq;
|
|
int i;
|
|
|
|
iinfo("press: %02x release: %02x handler: %p arg: %p\n",
|
|
press, release, handler, arg);
|
|
|
|
/* Start with all interrupts disabled */
|
|
|
|
flags = enter_critical_section();
|
|
djoy_disable();
|
|
|
|
/* If no events are indicated or if no handler is provided, then this
|
|
* must really be a request to disable interrupts.
|
|
*/
|
|
|
|
/* REVISIT: Currently does not distinguish press/release selections */
|
|
|
|
if (either && handler != NULL)
|
|
{
|
|
/* Save the new the handler and argument */
|
|
|
|
g_djoyhandler = handler;
|
|
g_djoyarg = arg;
|
|
|
|
/* Attach and enable interrupts each GPIO. */
|
|
|
|
for (i = 0; i < DJOY_NGPIOS; i++)
|
|
{
|
|
irq = g_buttonirq[i];
|
|
if (irq > 0)
|
|
{
|
|
irq_attach(irq, djoy_interrupt, arg);
|
|
up_enable_irq(irq);
|
|
}
|
|
}
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: djoy_disable
|
|
*
|
|
* Description:
|
|
* Disable all joystick interrupts
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void djoy_disable(void)
|
|
{
|
|
#ifdef CONFIG_LPC17_40_GPIOIRQ
|
|
irqstate_t flags;
|
|
int irq;
|
|
int i;
|
|
|
|
/* Disable and detach all button handlers for each GPIO */
|
|
|
|
flags = enter_critical_section();
|
|
for (i = 0; i < DJOY_NGPIOS; i++)
|
|
{
|
|
irq = g_buttonirq[i];
|
|
if (irq > 0)
|
|
{
|
|
up_disable_irq(irq);
|
|
irq_detach(irq);
|
|
}
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
#endif
|
|
|
|
/* Nullify the handler and argument */
|
|
|
|
g_djoyhandler = NULL;
|
|
g_djoyarg = NULL;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: djoy_interrupt
|
|
*
|
|
* Description:
|
|
* Discrete joystick interrupt handler
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int djoy_interrupt(int irq, FAR void *context, FAR void *arg)
|
|
{
|
|
DEBUGASSERT(g_djoyhandler != NULL);
|
|
if (g_djoyhandler != NULL)
|
|
{
|
|
g_djoyhandler(&g_djoylower, g_djoyarg);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lpc17_40_djoy_initialization
|
|
*
|
|
* Description:
|
|
* Initialize and register the discrete joystick driver
|
|
*
|
|
****************************************************************************/
|
|
|
|
int lpc17_40_djoy_initialization(void)
|
|
{
|
|
int i;
|
|
|
|
/* Configure the GPIO pins as inputs. NOTE: This is unnecessary for
|
|
* interrupting pins since it will also be done by lpc17_40_gpiosetevent().
|
|
*/
|
|
|
|
for (i = 0; i < DJOY_NGPIOS; i++)
|
|
{
|
|
lpc17_40_configgpio(g_joygpio[i]);
|
|
}
|
|
|
|
/* Make sure that all interrupts are disabled */
|
|
|
|
djoy_disable();
|
|
|
|
/* Register the joystick device as /dev/djoy0 */
|
|
|
|
return djoy_register(CONFIG_OPEN1788_DJOYDEV, &g_djoylower);
|
|
}
|