2 FreeRTOS V7.3.0 - Copyright (C) 2012 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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32 >>>NOTE<<< The modification to the GPL is included to allow you to
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33 distribute a combined work that includes FreeRTOS without being obliged to
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34 provide the source code for proprietary components outside of the FreeRTOS
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35 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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36 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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37 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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38 more details. You should have received a copy of the GNU General Public
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39 License and the FreeRTOS license exception along with FreeRTOS; if not it
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40 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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41 by writing to Richard Barry, contact details for whom are available on the
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46 ***************************************************************************
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48 * Having a problem? Start by reading the FAQ "My application does *
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49 * not run, what could be wrong?" *
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51 * http://www.FreeRTOS.org/FAQHelp.html *
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53 ***************************************************************************
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56 http://www.FreeRTOS.org - Documentation, training, latest versions, license
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57 and contact details.
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59 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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60 including FreeRTOS+Trace - an indispensable productivity tool.
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62 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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63 the code with commercial support, indemnification, and middleware, under
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64 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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65 provide a safety engineered and independently SIL3 certified version under
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66 the SafeRTOS brand: http://www.SafeRTOS.com.
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69 /*-----------------------------------------------------------
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70 * Implementation of functions defined in portable.h for the SH2A port.
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71 *----------------------------------------------------------*/
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73 /* Scheduler includes. */
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74 #include "FreeRTOS.h"
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77 /* Library includes. */
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80 /* Hardware specifics. */
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81 #include <iorx62n.h>
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83 /*-----------------------------------------------------------*/
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85 /* Tasks should start with interrupts enabled and in Supervisor mode, therefore
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86 PSW is set with U and I set, and PM and IPL clear. */
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87 #define portINITIAL_PSW ( ( portSTACK_TYPE ) 0x00030000 )
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88 #define portINITIAL_FPSW ( ( portSTACK_TYPE ) 0x00000100 )
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90 /*-----------------------------------------------------------*/
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93 * Function to start the first task executing - written in asm code as direct
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94 * access to registers is required.
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96 extern void prvStartFirstTask( void );
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99 * The tick ISR handler. The peripheral used is configured by the application
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100 * via a hook/callback function.
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102 __interrupt void vTickISR( void );
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104 /*-----------------------------------------------------------*/
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106 extern void *pxCurrentTCB;
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108 /*-----------------------------------------------------------*/
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111 * See header file for description.
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113 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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115 /* R0 is not included as it is the stack pointer. */
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117 *pxTopOfStack = 0x00;
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119 *pxTopOfStack = portINITIAL_PSW;
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121 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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123 /* When debugging it can be useful if every register is set to a known
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124 value. Otherwise code space can be saved by just setting the registers
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125 that need to be set. */
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126 #ifdef USE_FULL_REGISTER_INITIALISATION
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129 *pxTopOfStack = 0xffffffff; /* r15. */
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131 *pxTopOfStack = 0xeeeeeeee;
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133 *pxTopOfStack = 0xdddddddd;
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135 *pxTopOfStack = 0xcccccccc;
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137 *pxTopOfStack = 0xbbbbbbbb;
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139 *pxTopOfStack = 0xaaaaaaaa;
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141 *pxTopOfStack = 0x99999999;
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143 *pxTopOfStack = 0x88888888;
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145 *pxTopOfStack = 0x77777777;
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147 *pxTopOfStack = 0x66666666;
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149 *pxTopOfStack = 0x55555555;
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151 *pxTopOfStack = 0x44444444;
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153 *pxTopOfStack = 0x33333333;
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155 *pxTopOfStack = 0x22222222;
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160 pxTopOfStack -= 15;
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164 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R1 */
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166 *pxTopOfStack = portINITIAL_FPSW;
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168 *pxTopOfStack = 0x12345678; /* Accumulator. */
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170 *pxTopOfStack = 0x87654321; /* Accumulator. */
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172 return pxTopOfStack;
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174 /*-----------------------------------------------------------*/
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176 portBASE_TYPE xPortStartScheduler( void )
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178 extern void vApplicationSetupTimerInterrupt( void );
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180 /* Use pxCurrentTCB just so it does not get optimised away. */
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181 if( pxCurrentTCB != NULL )
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183 /* Call an application function to set up the timer that will generate the
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184 tick interrupt. This way the application can decide which peripheral to
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185 use. A demo application is provided to show a suitable example. */
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186 vApplicationSetupTimerInterrupt();
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188 /* Enable the software interrupt. */
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189 _IEN( _ICU_SWINT ) = 1;
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191 /* Ensure the software interrupt is clear. */
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192 _IR( _ICU_SWINT ) = 0;
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194 /* Ensure the software interrupt is set to the kernel priority. */
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195 _IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;
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197 /* Start the first task. */
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198 prvStartFirstTask();
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201 /* Should not get here. */
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204 /*-----------------------------------------------------------*/
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206 #pragma vector = configTICK_VECTOR
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207 __interrupt void vTickISR( void )
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209 /* Re-enable interrupts. */
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210 __enable_interrupt();
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212 /* Increment the tick, and perform any processing the new tick value
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214 __set_interrupt_level( configMAX_SYSCALL_INTERRUPT_PRIORITY );
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216 vTaskIncrementTick();
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218 __set_interrupt_level( configKERNEL_INTERRUPT_PRIORITY );
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220 /* Only select a new task if the preemptive scheduler is being used. */
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221 #if( configUSE_PREEMPTION == 1 )
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225 /*-----------------------------------------------------------*/
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227 void vPortEndScheduler( void )
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229 /* Not implemented as there is nothing to return to. */
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231 /*-----------------------------------------------------------*/
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