2 FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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79 /*-----------------------------------------------------------
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80 * Port specific definitions.
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82 * The settings in this file configure FreeRTOS correctly for the
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83 * given hardware and compiler.
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85 * These settings should not be altered.
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86 *-----------------------------------------------------------
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89 /* Type definitions. */
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90 #define portCHAR char
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91 #define portFLOAT float
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92 #define portDOUBLE double
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93 #define portLONG long
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94 #define portSHORT short
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95 #define portSTACK_TYPE unsigned portCHAR
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96 #define portBASE_TYPE char
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98 #if( configUSE_16_BIT_TICKS == 1 )
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99 typedef unsigned portSHORT portTickType;
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100 #define portMAX_DELAY ( portTickType ) 0xffff
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102 typedef unsigned portLONG portTickType;
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103 #define portMAX_DELAY ( portTickType ) 0xffffffff
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105 /*-----------------------------------------------------------*/
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107 /* Hardware specifics. */
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108 #define portBYTE_ALIGNMENT 1
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109 #define portSTACK_GROWTH ( -1 )
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110 #define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
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111 #define portYIELD() __asm( "swi" );
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112 #define portNOP() __asm( "nop" );
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113 /*-----------------------------------------------------------*/
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115 /* Critical section handling. */
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116 #define portENABLE_INTERRUPTS() __asm( "cli" )
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117 #define portDISABLE_INTERRUPTS() __asm( "sei" )
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120 * Disable interrupts before incrementing the count of critical section nesting.
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121 * The nesting count is maintained so we know when interrupts should be
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122 * re-enabled. Once interrupts are disabled the nesting count can be accessed
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123 * directly. Each task maintains its own nesting count.
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125 #define portENTER_CRITICAL() \
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127 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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129 portDISABLE_INTERRUPTS(); \
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130 uxCriticalNesting++; \
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134 * Interrupts are disabled so we can access the nesting count directly. If the
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135 * nesting is found to be 0 (no nesting) then we are leaving the critical
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136 * section and interrupts can be re-enabled.
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138 #define portEXIT_CRITICAL() \
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140 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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142 uxCriticalNesting--; \
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143 if( uxCriticalNesting == 0 ) \
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145 portENABLE_INTERRUPTS(); \
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148 /*-----------------------------------------------------------*/
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150 /* Task utilities. */
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153 * These macros are very simple as the processor automatically saves and
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154 * restores its registers as interrupts are entered and exited. In
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155 * addition to the (automatically stacked) registers we also stack the
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156 * critical nesting count. Each task maintains its own critical nesting
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157 * count as it is legitimate for a task to yield from within a critical
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158 * section. If the banked memory model is being used then the PPAGE
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159 * register is also stored as part of the tasks context.
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162 #ifdef BANKED_MODEL
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164 * Load the stack pointer for the task, then pull the critical nesting
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165 * count and PPAGE register from the stack. The remains of the
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166 * context are restored by the RTI instruction.
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168 #define portRESTORE_CONTEXT() \
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170 extern volatile void * pxCurrentTCB; \
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171 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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173 __asm( "ldx pxCurrentTCB" ); \
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174 __asm( "lds 0, x" ); \
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176 __asm( "staa uxCriticalNesting" ); \
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178 __asm( "staa 0x30" ); /* 0x30 = PPAGE */ \
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182 * By the time this macro is called the processor has already stacked the
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183 * registers. Simply stack the nesting count and PPAGE value, then save
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184 * the task stack pointer.
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186 #define portSAVE_CONTEXT() \
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188 extern volatile void * pxCurrentTCB; \
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189 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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191 __asm( "ldaa 0x30" ); /* 0x30 = PPAGE */ \
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193 __asm( "ldaa uxCriticalNesting" ); \
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195 __asm( "ldx pxCurrentTCB" ); \
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196 __asm( "sts 0, x" ); \
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201 * These macros are as per the BANKED versions above, but without saving
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202 * and restoring the PPAGE register.
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205 #define portRESTORE_CONTEXT() \
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207 extern volatile void * pxCurrentTCB; \
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208 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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210 __asm( "ldx pxCurrentTCB" ); \
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211 __asm( "lds 0, x" ); \
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213 __asm( "staa uxCriticalNesting" ); \
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216 #define portSAVE_CONTEXT() \
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218 extern volatile void * pxCurrentTCB; \
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219 extern volatile unsigned portBASE_TYPE uxCriticalNesting; \
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221 __asm( "ldaa uxCriticalNesting" ); \
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223 __asm( "ldx pxCurrentTCB" ); \
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224 __asm( "sts 0, x" ); \
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229 * Utility macro to call macros above in correct order in order to perform a
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230 * task switch from within a standard ISR. This macro can only be used if
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231 * the ISR does not use any local (stack) variables. If the ISR uses stack
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232 * variables portYIELD() should be used in it's place.
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234 #define portTASK_SWITCH_FROM_ISR() \
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235 portSAVE_CONTEXT(); \
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236 vTaskSwitchContext(); \
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237 portRESTORE_CONTEXT();
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240 /* Task function macros as described on the FreeRTOS.org WEB site. */
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241 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
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242 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
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244 #endif /* PORTMACRO_H */
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