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Add logic to encode/decode special SLCD actions

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This commit is contained in:
Gregory Nutt 2013-05-23 10:23:41 -06:00
parent b5dd706120
commit c1f6d50093
7 changed files with 820 additions and 12 deletions
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6
ChangeLog
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@ -3819,8 +3819,8 @@
there is a issue of ARM9 systems with low vectors and large memories
that will have to be addressed in the future.
* libc/misc/lib_kbdencode.c and lib_kbddecode.c: Add logic to marshal
and serialized "out-of-band" keyboard commands intermixed with normal
ASCII data (not yet hooked into anything).
and serialize speical keyboard commands intermixed with normal ASCII
data (not yet hooked into anything).
* drivers/usbhost/usbhost_hidkbd.c: If CONFIG_HIDKBD_ENCODED is
defined, this driver will now use libc/misc/lib_kbdencode.c to
encode special function keys.
@ -4779,3 +4779,5 @@
(2013-5-23)
* fs/fs_poll.c: Actually, it should not ignore invlid descriptors, it
should set the POLLNVAL event and return immediately (2013-5-23).
* libc/misc/lib_slcdencode.c and lib_slcddecode.c: Add logic to marshal
and serialized special SLCD intermixed with normal ASCII data (2013-5-23)

212
include/nuttx/lcd/slcd_codec.h Normal file
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@ -0,0 +1,212 @@
/************************************************************************************
* include/nuttx/input/slcd_codec.h
* Serialize and marshaling data and events for character-based, segment LCDs
*
* Copyright (C) 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 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.
*
************************************************************************************/
#ifndef __INCLUDE_NUTTX_INPUT_SLCD_CODEC_H
#define __INCLUDE_NUTTX_INPUT_SLCD_CODEC_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/streams.h>
#ifdef CONFIG_LIB_SLCDCODEC
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Types
****************************************************************************/
/* These are the special SLCD commands recognized by the CODEC. NOTE: that
* some require a a count argument, N.
*/
enum slcdcode_e
{
SLCDCODE_NORMAL = 0, /* Not a special keycode */
/* Delete and Backspace keycodes (in case they may be different than the
* ASCII BKSP and DEL values.
*/
SLCDCODE_FWDDEL, /* DELete (forward delete) N characters moving cursor */
SLCDCODE_BACKDEL, /* Backspace (backward delete) N characters */
SLCDCODE_ERASE, /* Erase N characters from the cursor position */
SLCDCODE_ERASEEOL, /* Erase from the cursor position to the end of line */
SLCDCODE_CLEAR, /* Home the cursor and erase the entire display */
/* Cursor movement */
SLCDCODE_HOME, /* Cursor home */
SLCDCODE_END, /* Cursor end */
SLCDCODE_LEFT, /* Cursor left by N characters */
SLCDCODE_RIGHT, /* Cursor right by N characters */
SLCDCODE_UP, /* Cursor up by N lines */
SLCDCODE_DOWN, /* Cursor down by N lines */
SLCDCODE_PAGEUP, /* Cursor up by N pages */
SLCDCODE_PAGEDOWN, /* Cursor down by N pages */
/* Blinking */
SLCDCODE_BLINKSTART, /* Start blinking with current cursor position */
SLCDCODE_BLINKEND, /* End blinking after the current cursor position */
SLCDCODE_BLINKOFF /* Turn blinking off */
};
#define FIRST_SLCDCODE SLCDCODE_FWDDEL
#define LAST_SLCDCODE SLCDCODE_BLINKOFF
/* Values returned by slcd_decode() */
enum slcdret_e
{
SLCDRET_CHAR = 0, /* A normal character was returned */
SLCDRET_SPEC, /* A special SLCD action was returned */
SLCDRET_EOF /* An EOF (or possibly an error) occurred */
};
/****************************************************************************
* Public Types
****************************************************************************/
/* Working data needed by slcd_encode that must be provided and initialized
* by the caller.
*/
struct slcdstate_s
{
uint8_t nch; /* Number of characters in the buffer */
uint8_t ndx; /* Index to next character in the buffer */
uint8_t buf[5]; /* Buffer of ungotten data */
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
extern "C"
{
#endif
/****************************************************************************
* The following functions are intended for use by "producer", application
* code to encode information into driver I/O buffers.
****************************************************************************/
/****************************************************************************
* Name: slcd_put
*
* Description:
* Put one byte of normal character data into the output data stream.
*
* Input Parameters:
* ch - The character to be added to the output stream.
* stream - An instance of lib_outstream_s to do the low-level put
* operation.
*
* Returned Value:
* None
*
****************************************************************************/
#define slcd_put(ch, stream) (stream)->put((stream), (int)(ch))
/****************************************************************************
* Name: slcd_encode
*
* Description:
* Encode one special action into the output data stream
*
* Input Parameters:
* code - The action to be taken
* count - The 8-bit unsigned count value N associated with some actions
* stream - An instance of lib_outstream_s to do the low-level put
* operation.
*
* Returned Value:
* None
*
****************************************************************************/
void slcd_encode(enum slcdcode_e code, uint8_t count,
FAR struct lib_outstream_s *stream);
/****************************************************************************
* The following functions are intended for use by "consumer" SLCD driver
* code to remove and decode information from the application provided
* buffer.
****************************************************************************/
/****************************************************************************
* Name: slcd_decode
*
* Description:
* Get one byte of data or special command from the application provided
* input buffer.
*
* Input Parameters:
* stream - An instance of lib_instream_s to do the low-level get
* operation.
* state - A user provided buffer to support parsing. This structure
* should be cleared the first time that slcd_decode is called.
* pch - The location to save the returned value. This may be
* either a normal, character code or a special command from enum
* slcdcode_e, depending on the return value from slcd_decode()
* parg - The location to save the count argument that accompanies some
* special actions
*
* Returned Value:
*
* See enum slcdret_e
*
****************************************************************************/
enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
FAR struct slcdstate_s *state, FAR uint8_t *pch,
FAR uint8_t *parg);
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_LIB_SLCDCODEC */
#endif /* __INCLUDE_NUTTX_INPUT_SLCD_CODEC_H */

35
libc/Kconfig
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@ -475,18 +475,37 @@ config LIB_KBDCODEC
may have an (optional) encoding/decoding layer on the data returned
by the character driver. A keyboard may return simple text data
(alphabetic, numeric, and punctuaction) or control characters
(enter, control-C, etc.). We can think about this the normal
"in-band" keyboard data stream. However, in addition, most
keyboards support actions that cannot be represented as text data.
Such actions include things like cursor controls (home, up arrow,
(enter, control-C, etc.). However, in addition, most keyboards
support actions that cannot be represented as text data. Such
actions include things like cursor controls (home, up arrow,
page down, etc.), editing functions (insert, delete, etc.), volume
controls, (mute, volume up, etc.) and other special functions. We
can think about this as special, "out-of-band" keyboard commands.
In this case, some special encoding may be required to multiplex
the in-band text data and out-of-band command streams.
controls, (mute, volume up, etc.) and other special functions.
Some special encoding may be required to multiplex these two classes
of data.
This option enables the functions that implement the encoding and
decoding of keyboard data. These are the interfaces prototyped in
include/nuttx/input/kbd_codec.h. While not correctly a part of
the C library, it is included here because the decoding side of this
interface must be accessible by end user programs.
config LIB_SLCDCODEC
bool "Segment LCD CODEC"
default n
---help---
In NuttX, a character-oriented, segment LCD (SLCD) driver is simply
a character device that may have an (optional) encoding/decoding
layer on the data provided to the SLCD driver. The application may
provide simple text data (alphabetic, numeric, and punctuaction) or
control characters (enter, control-C, etc.). However, in addition,
most SLCDs support actions that cannot be represented as text data.
Such actions include things like cursor controls (home, up arrow,
page down, etc.) and other special functions (e.g., blinking). Some
special encoding may be required to multiplex these two classes of
data.
This option enables the functions that implement the encoding and
decoding of SLCD data. These are the interfaces prototyped in
include/nuttx/lcd/slcd_codec.h. While not correctly a part of the C
library, it is included here because the encoding side of this
interface must be accessible by end user programs.

6
libc/misc/Make.defs
View File

@ -69,6 +69,12 @@ ifeq ($(CONFIG_LIB_KBDCODEC),y)
CSRCS += lib_kbdencode.c lib_kbddecode.c
endif
# SLCD driver encoder/decoder
ifeq ($(CONFIG_LIB_SLCDCODEC),y)
CSRCS += lib_slcdencode.c lib_slcddecode.c
endif
# Add the misc directory to the build
DEPPATH += --dep-path misc

4
libc/misc/lib_kbddecode.c
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@ -74,8 +74,8 @@
* Name: kbd_reget
*
* Description:
* We have unused characters from the last, unsuccessful. Return one of
* these instead of the .
* We have unused characters from the last, unsuccessful decode attempt.
* Return one of these instead of the new character from the stream.
*
* Input Parameters:
* stream - An instance of lib_instream_s to do the low-level get

366
libc/misc/lib_slcddecode.c Normal file
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@ -0,0 +1,366 @@
/****************************************************************************
* libc/msic/lib_slcddecode.c
* Decoding side of the SLCD CODEC
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Authors: 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 <stdbool.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/streams.h>
#include <nuttx/ascii.h>
#include <nuttx/lcd/slcd_codec.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#define NDX_ESC 0
#define NDX_BRACKET 1
#define NDX_CODE3 2
#define NDX_COUNTH 2
#define NDX_COUNTL 3
#define NDX_CODE5 4
#define NCH_ESC 1
#define NCH_BRACKET 2
#define NCH_CODE3 3
#define NCH_COUNTH 3
#define NCH_COUNTL 4
#define NCH_CODE5 5
#define IS_HEX(a) ((((a) >= '0') && ((a) <= '9')) || \
(((a) >= 'a') && ((a) <= 'f')))
#define CODE_MIN ('A' + FIRST_SLCDCODE)
#define CODE_MAX ('A' + LAST_SLCDCODE)
#define IS_CODE(a) (((a) >= CODE_MIN) && ((a) <= CODE_MAX))
#define CODE_RETURN(a) (enum slcdcode_e)((a) - 'A')
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: slcd_nibble
*
* Description:
* Convert a ASCII hexadecimal character (using only lower case alphabetics
* into a binary nibble
*
* Input Parameters:
* ascii - The nibble characgter.
*
* Returned Value:
* The binary value of the nibble.
*
****************************************************************************/
static uint8_t slcd_nibble(uint8_t ascii)
{
if (ascii >= '0' && ascii <= '9')
{
return ascii - '0';
}
else
{
return ascii - 'a';
}
}
/****************************************************************************
* Name: slcd_reget
*
* Description:
* We have unused characters from the last, unsuccessful decode attempt.
* Return one of these instead of the new character from the stream.
*
* Input Parameters:
* stream - An instance of lib_instream_s to do the low-level get
* operation.
* pch - The location character to save the returned value. This may be
* either a normal, character code or a special command from enum
* slcd_keycode_e
*
* Returned Value:
* Always SLCDRET_CHAR
*
****************************************************************************/
static enum slcdret_e slcd_reget(FAR struct slcdstate_s *state,
FAR uint8_t *pch, FAR uint8_t *parg)
{
/* Return the next character */
*pch = state->buf[state->ndx];
*parg = 0;
/* Bump up the indices and return false (meaning a normal character) */
state->ndx++;
state->nch--;
return SLCDRET_CHAR;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: slcd_decode
*
* Description:
* Get one byte of data or special command from the application provided
* input buffer.
*
* Input Parameters:
* stream - An instance of lib_instream_s to do the low-level get
* operation.
* state - A user provided buffer to support parsing. This structure
* should be cleared the first time that slcd_decode is called.
* pch - The location to save the returned value. This may be
* either a normal, character code or a special command from enum
* slcdcode_e, depending on the return value from slcd_decode()
* parg - The location to save the count argument that accompanies some
* special actions
*
* Returned Value:
*
* false: Normal character
* true: Special SLCD action code with possible argument
*
****************************************************************************/
enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
FAR struct slcdstate_s *state, FAR uint8_t *pch,
FAR uint8_t *parg)
{
enum slcdcode_e code;
uint8_t count;
int ch;
DEBUGASSERT(stream && state && pch && parg);
/* Are their ungotten characters from the last, failed parse? */
if (state->nch > 0)
{
/* Yes, return the next ungotten character */
return slcd_reget(state, pch, parg);
}
state->ndx = 0;
/* No, ungotten characters. Get the next character from the buffer. */
ch = stream->get(stream);
if (ch == EOF)
{
/* End of file/stream (or perhaps an I/O error) */
return SLCDRET_EOF;
}
/* Save the character (whatever it is) in case we fail parsing later */
state->buf[NDX_ESC] = (uint8_t)ch;
state->nch = NCH_ESC;
/* Check for the beginning of an escape sequence */
if (ch != ASCII_ESC)
{
/* Not the beginning of an escape sequence. Return the character. */
return slcd_reget(state, pch, parg);
}
/* Get the next character from the buffer */
ch = stream->get(stream);
if (ch == EOF)
{
/* End of file/stream. Return the escape character now. We will
* return the EOF indication next time.
*/
return slcd_reget(state, pch, parg);
}
/* Save the character (whatever it is) in case we fail parsing later */
state->buf[NDX_BRACKET] = ch;
state->nch = NCH_BRACKET;
/* Check for ESC-[ */
if (ch != '[')
{
/* Not the beginning of an escape sequence. Return the ESC now,
* return the following characters later.
*/
return slcd_reget(state, pch, parg);
}
/* Get the next character from the buffer */
ch = stream->get(stream);
if (ch == EOF)
{
/* End of file/stream. Return the ESC now; return the following
* characters later.
*/
return slcd_reget(state, pch, parg);
}
/* If the next character is a hexidecimal value (with lower case
* alphabetic characters), then we are parsing a 5-byte sequence.
*/
if (!IS_HEX(ch))
{
/* Verify the special CLCD action code */
if (ch < (int)FIRST_SLCDCODE || ch > (int)LAST_SLCDCODE)
{
/* Not a special command code.. put the character in the reget
* buffer.
*/
state->buf[NDX_CODE3] = (uint8_t)ch;
state->nch = NCH_CODE3;
/* Return the ESC now and the next two characters later. */
return slcd_reget(state, pch, parg);
}
/* Provide the return values */
code = CODE_RETURN(ch);
count = 0;
}
else
{
/* Save the first character of the two byte hexidecimal number */
state->buf[NDX_COUNTH] = (uint8_t)ch;
state->nch = NCH_COUNTH;
/* Get the next character from the buffer */
ch = stream->get(stream);
if (ch == EOF)
{
/* End of file/stream. Return the ESC now; return the following
* characters later.
*/
return slcd_reget(state, pch, parg);
}
/* We expect the next character to be the second byte of hexidecimal
* count value.
*/
if (!IS_HEX(ch))
{
/* Not a 5-byte escape sequence. Return the ESC now; return the
* following characters later.
*/
return slcd_reget(state, pch, parg);
}
/* Save the second character of the two byte hexidecimal number */
state->buf[NDX_COUNTL] = (uint8_t)ch;
state->nch = NCH_COUNTL;
/* Get the next character from the buffer */
ch = stream->get(stream);
if (ch == EOF)
{
/* End of file/stream. Return the ESC now; return the following
* characters later.
*/
return slcd_reget(state, pch, parg);
}
/* Verify the special CLCD action code */
if (ch < (int)FIRST_SLCDCODE || ch > (int)LAST_SLCDCODE)
{
/* Not a special command code.. put the character in the reget
* buffer.
*/
state->buf[NDX_CODE5] = (uint8_t)ch;
state->nch = NCH_CODE5;
/* Return the ESC now and the next two characters later. */
return slcd_reget(state, pch, parg);
}
/* Provide the return values */
code = CODE_RETURN(ch);
count = slcd_nibble(state->buf[NDX_COUNTH]) << 4;
slcd_nibble(state->buf[NDX_COUNTL]);
}
/* We have successfully parsed the the entire escape sequence. Return the
* CLCD value in pch, return the count in parg, and an indication that this
* is a special action.
*/
*pch = code;
*parg = count;
state->nch = 0;
return SLCDRET_SPEC;
}

203
libc/misc/lib_slcdencode.c Normal file
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@ -0,0 +1,203 @@
/****************************************************************************
* libc/msic/lib_slcdencode.c
* Encoding side of the SLCD CODEC
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Authors: 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 <assert.h>
#include <nuttx/streams.h>
#include <nuttx/ascii.h>
#include <nuttx/lcd/slcd_codec.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Name: slcd_nibble
*
* Description:
* Convert a binary nibble to a hexadecimal character (using only lower
* case alphabetics).
*
* Input Parameters:
* binary - The nibble value.
*
* Returned Value:
* The ASCII hexadecimal character representing the nibble.
*
****************************************************************************/
static uint8_t slcd_nibble(uint8_t binary)
{
binary &= 0x0f;
if (binary > 9)
{
return '0' + binary;
}
else
{
return 'a' + binary;
}
}
/****************************************************************************
* Name: slcd_put3
*
* Description:
* Encode one special special 3-byte sequence command into the output
* stream.
*
* Input Parameters:
* slcdcode - The special action to be added to the output stream.
* stream - An instance of lib_outstream_s to do the low-level put
* operation.
*
* Returned Value:
* None
*
****************************************************************************/
static inline void slcd_put3(uint8_t slcdcode,
FAR struct lib_outstream_s *stream)
{
/* Put the 3-byte escape sequences into the output buffer */
stream->put(stream, ASCII_ESC);
stream->put(stream, '[');
stream->put(stream, 'A' + (int)slcdcode);
}
/****************************************************************************
* Name: slcd_putarg
*
* Description:
* Encode one special special 5-byte sequence command into the output
* stream.
*
* Input Parameters:
* slcdcode - The command to be added to the output stream.
* stream - An instance of lib_outstream_s to do the low-level put
* operation.
* terminator - Escape sequence terminating character.
*
* Returned Value:
* None
*
****************************************************************************/
static inline void slcd_put5(uint8_t slcdcode, uint8_t count,
FAR struct lib_outstream_s *stream)
{
/* The minimum value of the count argument is one */
if (count < 1)
{
count = 1;
}
/* Put the 5-byte escape sequences into the output buffer */
stream->put(stream, ASCII_ESC);
stream->put(stream, '[');
stream->put(stream, slcd_nibble(count >> 4));
stream->put(stream, slcd_nibble(count));
stream->put(stream, 'A' + (int)slcdcode);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: slcd_encode
*
* Description:
* Encode one special action into the output data stream
*
* Input Parameters:
* code - The action to be taken
* count - The count value N associated with some actions
* stream - An instance of lib_outstream_s to do the low-level put
* operation.
*
* Returned Value:
* None
*
****************************************************************************/
void slcd_encode(enum slcdcode_e code, uint8_t count,
FAR struct lib_outstream_s *stream)
{
switch (code)
{
/* Codes with no argument */
case SLCDCODE_ERASEEOL: /* Erase from the cursor position to the end of line */
case SLCDCODE_CLEAR: /* Home the cursor and erase the entire display */
case SLCDCODE_HOME: /* Cursor home */
case SLCDCODE_END: /* Cursor end */
case SLCDCODE_BLINKSTART: /* Start blinking with current cursor position */
case SLCDCODE_BLINKEND: /* End blinking after the current cursor position */
case SLCDCODE_BLINKOFF: /* Turn blinking off */
slcd_put3(code, stream); /* Generate the 3-byte encoding */
break;
/* Codes with an 8-bit count argument */
case SLCDCODE_FWDDEL: /* DELete (forward delete) N characters moving cursor */
case SLCDCODE_BACKDEL: /* Backspace (backward delete) N characters */
case SLCDCODE_ERASE: /* Erase N characters from the cursor position */
case SLCDCODE_LEFT: /* Cursor left by N characters */
case SLCDCODE_RIGHT: /* Cursor right by N characters */
case SLCDCODE_UP: /* Cursor up by N lines */
case SLCDCODE_DOWN: /* Cursor down by N lines */
case SLCDCODE_PAGEUP: /* Cursor up by N pages */
case SLCDCODE_PAGEDOWN: /* Cursor down by N pages */
slcd_put5(code, count, stream); /* Generate the 5-byte sequence */
break;
default:
case SLCDCODE_NORMAL: /* Not a special slcdcode */
break;
}
}