2 FreeRTOS V7.1.0 - Copyright (C) 2011 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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54 /* Standard includes. */
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57 /* FreeRTOS includes. */
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58 #include "FreeRTOS.h"
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61 /* Utils includes. */
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62 #include "CommandInterpreter.h"
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64 typedef struct xCOMMAND_INPUT_LIST
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66 const xCommandLineInput *pxCommandLineDefinition;
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67 struct xCOMMAND_INPUT_LIST *pxNext;
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68 } xCommandLineInputListItem;
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71 * The callback function that is executed when "help" is entered. This is the
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72 * only default command that is always present.
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74 static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char *pcCommandString );
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77 * Return the number of parameters that follow the command name.
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79 static signed char prvGetNumberOfParameters( const signed char * pcCommandString );
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81 /* The definition of the "help" command. This command is always at the front
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82 of the list of registered commands. */
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83 static const xCommandLineInput xHelpCommand =
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85 ( const signed char * const ) "help",
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86 ( const signed char * const ) "help: Lists all the registered commands\r\n",
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91 /* The definition of the list of commands. Commands that are registered are
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92 added to this list. */
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93 static xCommandLineInputListItem xRegisteredCommands =
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95 &xHelpCommand, /* The first command in the list is always the help command, defined in this file. */
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96 NULL /* The next pointer is initialised to NULL, as there are no other registered commands yet. */
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99 /* A buffer into which command outputs can be written is declared here, rather
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100 than in the command console implementation, to allow multiple command consoles
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101 to share the same buffer. For example, an application may allow access to the
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102 command interpreter by UART and by Ethernet. Sharing a buffer is done purely
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103 to save RAM. Note, however, that the command console itself is not re-entrant,
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104 so only one command interpreter interface can be used at any one time. For that
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105 reason, no attempt at providing mutual exclusion to the cOutputBuffer array is
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107 static signed char cOutputBuffer[ configCOMMAND_INT_MAX_OUTPUT_SIZE ];
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109 /*-----------------------------------------------------------*/
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111 portBASE_TYPE xCmdIntRegisterCommand( const xCommandLineInput * const pxCommandToRegister )
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113 static xCommandLineInputListItem *pxLastCommandInList = &xRegisteredCommands;
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114 xCommandLineInputListItem *pxNewListItem;
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115 portBASE_TYPE xReturn = pdFAIL;
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117 /* Check the parameter is not NULL. */
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118 configASSERT( pxCommandToRegister );
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120 /* Create a new list item that will reference the command being registered. */
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121 pxNewListItem = ( xCommandLineInputListItem * ) pvPortMalloc( sizeof( xCommandLineInputListItem ) );
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122 configASSERT( pxNewListItem );
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124 if( pxNewListItem != NULL )
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126 taskENTER_CRITICAL();
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128 /* Reference the command being registered from the newly created
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130 pxNewListItem->pxCommandLineDefinition = pxCommandToRegister;
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132 /* The new list item will get added to the end of the list, so
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133 pxNext has nowhere to point. */
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134 pxNewListItem->pxNext = NULL;
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136 /* Add the newly created list item to the end of the already existing
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138 pxLastCommandInList->pxNext = pxNewListItem;
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140 /* Set the end of list marker to the new list item. */
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141 pxLastCommandInList = pxNewListItem;
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143 taskEXIT_CRITICAL();
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150 /*-----------------------------------------------------------*/
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152 portBASE_TYPE xCmdIntProcessCommand( const signed char * const pcCommandInput, signed char * pcWriteBuffer, size_t xWriteBufferLen )
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154 static const xCommandLineInputListItem *pxCommand = NULL;
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155 portBASE_TYPE xReturn = pdTRUE;
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156 const signed char *pcRegisteredCommandString;
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158 /* Note: This function is not re-entrant. It must not be called from more
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161 if( pxCommand == NULL )
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163 /* Search for the command string in the list of registered commands. */
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164 for( pxCommand = &xRegisteredCommands; pxCommand != NULL; pxCommand = pxCommand->pxNext )
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166 pcRegisteredCommandString = pxCommand->pxCommandLineDefinition->pcCommand;
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167 if( strncmp( ( const char * ) pcCommandInput, ( const char * ) pcRegisteredCommandString, strlen( ( const char * ) pcRegisteredCommandString ) ) == 0 )
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169 /* The command has been found. Check it has the expected
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170 number of parameters. If cExpectedNumberOfParameters is -1,
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171 then there could be a variable number of parameters and no
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173 if( pxCommand->pxCommandLineDefinition->cExpectedNumberOfParameters >= 0 )
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175 if( prvGetNumberOfParameters( pcCommandInput ) != pxCommand->pxCommandLineDefinition->cExpectedNumberOfParameters )
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186 if( ( pxCommand != NULL ) && ( xReturn == pdFALSE ) )
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188 /* The command was found, but the number of parameters with the command
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190 strncpy( ( char * ) pcWriteBuffer, "Incorrect command parameter(s). Enter \"help\" to view a list of available commands.\r\n\r\n", xWriteBufferLen );
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193 else if( pxCommand != NULL )
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195 /* Call the callback function that is registered to this command. */
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196 xReturn = pxCommand->pxCommandLineDefinition->pxCommandInterpreter( pcWriteBuffer, xWriteBufferLen, pcCommandInput );
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198 /* If xReturn is pdFALSE, then no further strings will be returned
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199 after this one, and pxCommand can be reset to NULL ready to search
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200 for the next entered command. */
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201 if( xReturn == pdFALSE )
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208 /* pxCommand was NULL, the command was not found. */
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209 strncpy( ( char * ) pcWriteBuffer, ( const char * const ) "Command not recognised. Enter \"help\" to view a list of available commands.\r\n\r\n", xWriteBufferLen );
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215 /*-----------------------------------------------------------*/
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217 signed char *pcCmdIntGetOutputBuffer( void )
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219 return cOutputBuffer;
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221 /*-----------------------------------------------------------*/
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223 unsigned portBASE_TYPE uxCmdIntGetOutputBufferSizeBytes( void )
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225 return configCOMMAND_INT_MAX_OUTPUT_SIZE;
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227 /*-----------------------------------------------------------*/
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229 const signed char *pcCmdIntGetParameter( const signed char *pcCommandString, unsigned portBASE_TYPE uxWantedParameter, portBASE_TYPE *pxParameterStringLength )
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231 unsigned portBASE_TYPE uxParametersFound = 0;
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232 const signed char *pcReturn = NULL;
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234 *pxParameterStringLength = 0;
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236 while( uxParametersFound < uxWantedParameter )
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238 /* Index the character pointer past the current word. If this is the start
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239 of the command string then the first word is the command itself. */
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240 while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) != ' ' ) )
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245 /* Find the start of the next string. */
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246 while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) == ' ' ) )
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251 /* Was a string found? */
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252 if( *pcCommandString != 0x00 )
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254 /* Is this the start of the required parameter? */
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255 uxParametersFound++;
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257 if( uxParametersFound == uxWantedParameter )
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259 /* How long is the parameter? */
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260 pcReturn = pcCommandString;
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261 while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) != ' ' ) )
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263 ( *pxParameterStringLength )++;
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278 /*-----------------------------------------------------------*/
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280 static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char *pcCommandString )
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282 static const xCommandLineInputListItem * pxCommand = NULL;
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283 signed portBASE_TYPE xReturn;
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285 ( void ) pcCommandString;
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287 if( pxCommand == NULL )
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289 /* Reset the pxCommand pointer back to the start of the list. */
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290 pxCommand = &xRegisteredCommands;
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293 /* Return the next command help string, before moving the pointer on to
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294 the next command in the list. */
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295 strncpy( ( char * ) pcWriteBuffer, ( const char * ) pxCommand->pxCommandLineDefinition->pcHelpString, xWriteBufferLen );
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296 pxCommand = pxCommand->pxNext;
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298 if( pxCommand == NULL )
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300 /* There are no more commands in the list, so there will be no more
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301 strings to return after this one and pdFALSE should be returned. */
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311 /*-----------------------------------------------------------*/
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313 static signed char prvGetNumberOfParameters( const signed char * pcCommandString )
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315 signed char cParameters = 0;
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316 portBASE_TYPE xLastCharacterWasSpace = pdFALSE;
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318 /* Count the number of space delimited words in pcCommandString. */
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319 while( *pcCommandString != 0x00 )
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321 if( ( *pcCommandString ) == ' ' )
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323 if( xLastCharacterWasSpace != pdTRUE )
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326 xLastCharacterWasSpace = pdTRUE;
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331 xLastCharacterWasSpace = pdFALSE;
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337 /* The value returned is one less than the number of space delimited words,
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338 as the first word should be the command itself. */
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339 return cParameters;
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