2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 ***************************************************************************
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8 * + New to FreeRTOS, *
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9 * + Wanting to learn FreeRTOS or multitasking in general quickly *
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10 * + Looking for basic training, *
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11 * + Wanting to improve your FreeRTOS skills and productivity *
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13 * then take a look at the FreeRTOS eBook *
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15 * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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16 * http://www.FreeRTOS.org/Documentation *
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18 * A pdf reference manual is also available. Both are usually delivered *
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19 * to your inbox within 20 minutes to two hours when purchased between 8am *
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20 * and 8pm GMT (although please allow up to 24 hours in case of *
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21 * exceptional circumstances). Thank you for your support! *
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23 ***************************************************************************
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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 exception to the GPL is included to allow you to distribute
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31 a combined work that includes FreeRTOS without being obliged to provide the
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32 source code for proprietary components outside of the FreeRTOS kernel.
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33 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 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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62 /*-----------------------------------------------------------
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63 * Port specific definitions.
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65 * The settings in this file configure FreeRTOS correctly for the
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66 * given hardware and compiler.
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68 * These settings should not be altered.
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69 *-----------------------------------------------------------
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72 /* Type definitions. */
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73 #define portCHAR char
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74 #define portFLOAT float
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75 #define portDOUBLE double
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76 #define portLONG long
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77 #define portSHORT short
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78 #define portSTACK_TYPE unsigned portCHAR
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79 #define portBASE_TYPE char
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81 #if( configUSE_16_BIT_TICKS == 1 )
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82 typedef unsigned portSHORT portTickType;
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83 #define portMAX_DELAY ( portTickType ) 0xffff
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85 typedef unsigned portLONG portTickType;
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86 #define portMAX_DELAY ( portTickType ) 0xffffffff
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88 /*-----------------------------------------------------------*/
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90 /* Hardware specifics. */
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91 #define portBYTE_ALIGNMENT 1
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92 #define portSTACK_GROWTH ( -1 )
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93 #define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
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94 #define portYIELD() __asm( "swi" );
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95 /*-----------------------------------------------------------*/
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97 /* Critical section handling. */
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98 #define portENABLE_INTERRUPTS() __asm( "cli" )
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99 #define portDISABLE_INTERRUPTS() __asm( "sei" )
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102 * Disable interrupts before incrementing the count of critical section nesting.
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103 * The nesting count is maintained so we know when interrupts should be
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104 * re-enabled. Once interrupts are disabled the nesting count can be accessed
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105 * directly. Each task maintains its own nesting count.
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107 #define portENTER_CRITICAL() \
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109 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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111 portDISABLE_INTERRUPTS(); \
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112 uxCriticalNesting++; \
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116 * Interrupts are disabled so we can access the nesting count directly. If the
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117 * nesting is found to be 0 (no nesting) then we are leaving the critical
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118 * section and interrupts can be re-enabled.
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120 #define portEXIT_CRITICAL() \
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122 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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124 uxCriticalNesting--; \
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125 if( uxCriticalNesting == 0 ) \
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127 portENABLE_INTERRUPTS(); \
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130 /*-----------------------------------------------------------*/
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132 /* Task utilities. */
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135 * These macros are very simple as the processor automatically saves and
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136 * restores its registers as interrupts are entered and exited. In
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137 * addition to the (automatically stacked) registers we also stack the
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138 * critical nesting count. Each task maintains its own critical nesting
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139 * count as it is legitimate for a task to yield from within a critical
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140 * section. If the banked memory model is being used then the PPAGE
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141 * register is also stored as part of the tasks context.
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144 #ifdef BANKED_MODEL
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146 * Load the stack pointer for the task, then pull the critical nesting
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147 * count and PPAGE register from the stack. The remains of the
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148 * context are restored by the RTI instruction.
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150 #define portRESTORE_CONTEXT() \
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153 .globl pxCurrentTCB ; void * \n\
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154 .globl uxCriticalNesting ; char \n\
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156 ldx pxCurrentTCB \n\
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157 lds 0,x ; Stack \n\
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159 movb 1,sp+,uxCriticalNesting \n\
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160 movb 1,sp+,0x30 ; PPAGE \n\
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165 * By the time this macro is called the processor has already stacked the
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166 * registers. Simply stack the nesting count and PPAGE value, then save
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167 * the task stack pointer.
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169 #define portSAVE_CONTEXT() \
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172 .globl pxCurrentTCB ; void * \n\
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173 .globl uxCriticalNesting ; char \n\
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175 movb 0x30, 1,-sp ; PPAGE \n\
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176 movb uxCriticalNesting, 1,-sp \n\
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178 ldx pxCurrentTCB \n\
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179 sts 0,x ; Stack \n\
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185 * These macros are as per the BANKED versions above, but without saving
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186 * and restoring the PPAGE register.
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189 #define portRESTORE_CONTEXT() \
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192 .globl pxCurrentTCB ; void * \n\
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193 .globl uxCriticalNesting ; char \n\
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195 ldx pxCurrentTCB \n\
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196 lds 0,x ; Stack \n\
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198 movb 1,sp+,uxCriticalNesting \n\
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202 #define portSAVE_CONTEXT() \
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205 .globl pxCurrentTCB ; void * \n\
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206 .globl uxCriticalNesting ; char \n\
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208 movb uxCriticalNesting, 1,-sp \n\
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210 ldx pxCurrentTCB \n\
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211 sts 0,x ; Stack \n\
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217 * Utility macros to save/restore correct software registers for GCC. This is
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218 * useful when GCC does not generate appropriate ISR head/tail code.
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220 #define portISR_HEAD() \
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223 movw _.frame, 2,-sp \n\
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224 movw _.tmp, 2,-sp \n\
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225 movw _.z, 2,-sp \n\
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226 movw _.xy, 2,-sp \n\
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227 ;movw _.d2, 2,-sp \n\
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228 ;movw _.d1, 2,-sp \n\
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232 #define portISR_TAIL() \
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235 movw 2,sp+, _.xy \n\
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236 movw 2,sp+, _.z \n\
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237 movw 2,sp+, _.tmp \n\
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238 movw 2,sp+, _.frame \n\
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239 ;movw 2,sp+, _.d1 \n\
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240 ;movw 2,sp+, _.d2 \n\
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246 * Utility macro to call macros above in correct order in order to perform a
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247 * task switch from within a standard ISR. This macro can only be used if
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248 * the ISR does not use any local (stack) variables. If the ISR uses stack
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249 * variables portYIELD() should be used in it's place.
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252 #define portTASK_SWITCH_FROM_ISR() \
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253 portSAVE_CONTEXT(); \
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254 vTaskSwitchContext(); \
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255 portRESTORE_CONTEXT();
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258 /* Task function macros as described on the FreeRTOS.org WEB site. */
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259 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
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260 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
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266 #endif /* PORTMACRO_H */
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