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nuttx-apps/examples/hidkbd/hidkbd_main.c

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/****************************************************************************
* examples/hidkbd/hidkbd_main.c
*
* Copyright (C) 2011, 2013 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 Gregory Nutt 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 <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sched.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/usb/usbhost.h>
#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
# include <nuttx/streams.h>
# include <nuttx/input/kbd_codec.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Sanity checking */
#ifndef CONFIG_USBHOST
# error "CONFIG_USBHOST is not defined"
#endif
#ifdef CONFIG_USBHOST_INT_DISABLE
# error "Interrupt endpoints are disabled (CONFIG_USBHOST_INT_DISABLE)"
#endif
#ifndef CONFIG_NFILE_DESCRIPTORS
# error "CONFIG_NFILE_DESCRIPTORS > 0 needed"
#endif
/* Provide some default values for other configuration settings */
#ifndef CONFIG_EXAMPLES_HIDKBD_DEFPRIO
# define CONFIG_EXAMPLES_HIDKBD_DEFPRIO 50
#endif
#ifndef CONFIG_EXAMPLES_HIDKBD_STACKSIZE
# define CONFIG_EXAMPLES_HIDKBD_STACKSIZE 1024
#endif
#ifndef CONFIG_EXAMPLES_HIDKBD_DEVNAME
# define CONFIG_EXAMPLES_HIDKBD_DEVNAME "/dev/kbda"
#endif
#if !defined(CONFIG_HIDKBD_ENCODED) || !defined(CONFIG_LIB_KBDCODEC)
# undef CONFIG_EXAMPLES_HIDKBD_ENCODED
#endif
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
struct hidbkd_instream_s
{
struct lib_instream_s stream;
FAR char *buffer;
ssize_t nbytes;
};
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static FAR struct usbhost_connection_s *g_usbconn;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/* The platform-specific code must provide a wrapper called
* arch_usbhost_initialize() that will perform the actual USB host
* initialization.
*/
FAR struct usbhost_connection_s *arch_usbhost_initialize(void);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: hidkbd_getstream
*
* Description:
* Get one character from the keyboard.
*
****************************************************************************/
#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
static int hidkbd_getstream(FAR struct lib_instream_s *this)
{
FAR struct hidbkd_instream_s *kbdstream = (FAR struct hidbkd_instream_s *)this;
DEBUGASSERT(kbdstream && kbdstream->buffer);
if (kbdstream->nbytes > 0)
{
kbdstream->nbytes--;
kbdstream->stream.nget++;
return (int)*kbdstream->buffer++;
}
return EOF;
}
#endif
/****************************************************************************
* Name: hidkbd_decode
*
* Description:
* Decode encoded keyboard input
*
****************************************************************************/
#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
static void hidkbd_decode(FAR char *buffer, ssize_t nbytes)
{
struct hidbkd_instream_s kbdstream;
struct kbd_getstate_s state;
uint8_t ch;
int ret;
/* Initialize */
memset(&state, 0, sizeof(struct kbd_getstate_s));
kbdstream.stream.get = hidkbd_getstream;
kbdstream.stream.nget = 0;
kbdstream.buffer = buffer;
kbdstream.nbytes = nbytes;
/* Loop until all of the bytes have been consumed. We implicitly assume
* that the the escaped sequences do not cross buffer boundaries. That
* might be true if the read buffer were small or the data rates high.
*/
for (;;)
{
/* Decode the next thing from the buffer */
ret = kbd_decode((FAR struct lib_instream_s *)&kbdstream, &state, &ch);
if (ret == KBD_ERROR) /* Error or end-of-file */
{
/* Break out when all of the data has been processed */
break;
}
/* Normal data? Or special key? Press? Or release? */
switch (ret)
{
case KBD_PRESS: /* Key press event */
printf("Normal Press: %c [%02x]\n", isprint(ch) ? ch : '.', ch);
break;
case KBD_RELEASE: /* Key release event */
printf("Normal Release: %c [%02x]\n", isprint(ch) ? ch : '.', ch);
break;
case KBD_SPECPRESS: /* Special key press event */
printf("Special Press: %d\n", ch);
break;
case KBD_SPECREL: /* Special key release event */
printf("Special Release: %d\n", ch);
break;
case KBD_ERROR: /* Error or end-of-file, already handled */
default:
printf("Unexpected: %d\n", ret);
break;
}
}
}
#endif
/****************************************************************************
* Name: hidkbd_waiter
*
* Description:
* Wait for USB devices to be connected.
*
****************************************************************************/
static int hidkbd_waiter(int argc, char *argv[])
{
bool connected = false;
int rhpndx;
printf("hidkbd_waiter: Running\n");
for (;;)
{
/* Wait for the device to change state.
*
* REVISIT: This will not handle USB implementations (such as the the
* SAMA5) which have multiple downstream, root hub ports. In such cases,
* connected must be an array with dimension equal to the number of root
* hub ports.
*/
rhpndx = CONN_WAIT(g_usbconn, &connected);
DEBUGASSERT(rhpndx == OK);
connected = !connected;
printf("hidkbd_waiter: %s\n", connected ? "connected" : "disconnected");
/* Did we just become connected? */
if (connected)
{
/* Yes.. enumerate the newly connected device */
(void)CONN_ENUMERATE(g_usbconn, rhpndx);
}
}
/* Keep the compiler from complaining */
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: hidkbd_main
****************************************************************************/
int hidkbd_main(int argc, char *argv[])
{
char buffer[256];
pid_t pid;
ssize_t nbytes;
int fd;
int ret;
/* First, register all of the USB host HID keyboard class driver */
printf("hidkbd_main: Register class drivers\n");
ret = usbhost_kbdinit();
if (ret != OK)
{
printf("hidkbd_main: Failed to register the KBD class\n");
}
/* Then get an instance of the USB host interface. The platform-specific
* code must provide a wrapper called arch_usbhost_initialize() that will
* perform the actual USB host initialization.
*/
printf("hidkbd_main: Initialize USB host keyboard driver\n");
g_usbconn = arch_usbhost_initialize();
if (g_usbconn)
{
/* Start a thread to handle device connection. */
printf("hidkbd_main: Start hidkbd_waiter\n");
#ifndef CONFIG_CUSTOM_STACK
pid = task_create("usbhost", CONFIG_EXAMPLES_HIDKBD_DEFPRIO,
CONFIG_EXAMPLES_HIDKBD_STACKSIZE,
(main_t)hidkbd_waiter, (FAR char * const *)NULL);
#else
pid = task_create("usbhost", CONFIG_EXAMPLES_HIDKBD_DEFPRIO,
(main_t)hidkbd_waiter, (FAR char * const *)NULL);
#endif
/* Now just sleep. Eventually logic here will open the kbd device and
* perform the HID keyboard test.
*/
for (;;)
{
/* Open the keyboard device. Loop until the device is successfully
* opened.
*/
do
{
printf("Opening device %s\n", CONFIG_EXAMPLES_HIDKBD_DEVNAME);
fd = open(CONFIG_EXAMPLES_HIDKBD_DEVNAME, O_RDONLY);
if (fd < 0)
{
printf("Failed: %d\n", errno);
fflush(stdout);
sleep(3);
}
}
while (fd < 0);
printf("Device %s opened\n", CONFIG_EXAMPLES_HIDKBD_DEVNAME);
fflush(stdout);
/* Loop until there is a read failure (or EOF?) */
do
{
/* Read a buffer of data */
nbytes = read(fd, buffer, 256);
if (nbytes > 0)
{
/* On success, echo the buffer to stdout */
#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
hidkbd_decode(buffer, nbytes);
#else
(void)write(1, buffer, nbytes);
#endif
}
}
while (nbytes > 0);
printf("Closing device %s: %d\n", CONFIG_EXAMPLES_HIDKBD_DEVNAME, (int)nbytes);
fflush(stdout);
close(fd);
}
}
return 0;
}
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