forked from Archive/PX4-Autopilot
152 lines
5.3 KiB
C
152 lines
5.3 KiB
C
/****************************************************************************
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* libc/msic/lib_kbdencode.c
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* Encoding side of the Keyboard CODEC
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <stdint.h>
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#include <assert.h>
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#include <nuttx/streams.h>
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#include <nuttx/ascii.h>
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#include <nuttx/input/kbd_codec.h>
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Name: kbd_encode
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*
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* Description:
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* Encode one special special sequence command into the output stream.
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*
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* Input Parameters:
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* keycode - The command to be added to the output stream.
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* stream - An instance of lib_outstream_s to do the low-level put
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* operation.
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* terminator - Escape sequence terminating character.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void kbd_encode(uint8_t keycode, FAR struct lib_outstream_s *stream,
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uint8_t terminator)
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{
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stream->put(stream, ASCII_ESC);
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stream->put(stream, '[');
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stream->put(stream, (int)keycode);
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stream->put(stream, terminator);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: kbd_release
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*
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* Description:
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* Encode the release of a normal key.
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*
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* Input Parameters:
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* ch - The character associated with the key that was releared.
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* stream - An instance of lib_outstream_s to do the low-level put
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* operation.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void kbd_release(uint8_t ch, FAR struct lib_outstream_s *stream)
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{
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kbd_encode(ch, stream, ('a' + KBD_RELEASE));
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}
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/****************************************************************************
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* Name: kbd_specpress
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*
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* Description:
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* Denotes a special key press event. Put one special keyboard command
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* into the output stream.
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*
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* Input Parameters:
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* keycode - The command to be added to the output stream.
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* stream - An instance of lib_outstream_s to do the low-level put
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* operation.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void kbd_specpress(enum kbd_keycode_e keycode,
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FAR struct lib_outstream_s *stream)
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{
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DEBUGASSERT(stream && keycode >= KEYCODE_FWDDEL && keycode <= LAST_KEYCODE);
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kbd_encode((uint8_t)keycode, stream, ('a' + KBD_SPECPRESS));
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}
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/****************************************************************************
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* Name: kbd_specrel
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*
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* Description:
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* Denotes a special key release event. Put one special keyboard
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* command into the output stream.
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*
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* Input Parameters:
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* keycode - The command to be added to the output stream.
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* stream - An instance of lib_outstream_s to do the low-level put
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* operation.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void kbd_specrel(enum kbd_keycode_e keycode,
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FAR struct lib_outstream_s *stream)
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{
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DEBUGASSERT(stream && keycode >= KEYCODE_FWDDEL && keycode <= LAST_KEYCODE);
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kbd_encode((uint8_t)keycode, stream, ('a' + KBD_SPECREL));
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}
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