2 FreeRTOS V6.0.1 - 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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54 /*-----------------------------------------------------------
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55 * Implementation of functions defined in portable.h for the SH2A port.
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56 *----------------------------------------------------------*/
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58 /* Scheduler includes. */
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59 #include "FreeRTOS.h"
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62 #define portINITIAL_SR 0UL /* No interrupts masked. */
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65 /*-----------------------------------------------------------*/
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68 * Setup a peripheral timer to generate the RTOS tick interrupt.
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70 static void prvSetupTimerInterrupt( void );
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73 * The TRAPA handler used to force a context switch.
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75 void vPortYield( void );
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78 * Function to start the first task executing - defined in portasm.src.
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80 extern void vPortStartFirstTask( void );
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83 * Obtains the current GBR value - defined in portasm.src.
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85 extern unsigned long ulPortGetGBR( void );
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87 /*-----------------------------------------------------------*/
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90 * See header file for description.
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92 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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94 *pxTopOfStack = 0x11111111UL;
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96 *pxTopOfStack = 0x22222222UL;
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98 *pxTopOfStack = 0x33333333UL;
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102 *pxTopOfStack = portINITIAL_SR;
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105 /* PC then MACL, MACH. */
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106 // *pxTopOfStack = ( unsigned long ) pxCode;
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107 // pxTopOfStack -= 3;
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108 *pxTopOfStack = ( unsigned long ) pxCode;
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110 *pxTopOfStack = 0xffffUL;
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112 *pxTopOfStack = 0xeeeeUL;
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115 /* GBR then PR, R14-R5. */
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116 // *pxTopOfStack = ulPortGetGBR();
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117 // pxTopOfStack -= 12;
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118 *pxTopOfStack = 0x00UL;
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120 *pxTopOfStack = 0x11UL;
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122 *pxTopOfStack = 0x22UL;
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124 *pxTopOfStack = 0x33UL;
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126 *pxTopOfStack = 0x44UL;
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128 *pxTopOfStack = 0x55UL;
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130 *pxTopOfStack = 0x66UL;
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132 *pxTopOfStack = 0x77UL;
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134 *pxTopOfStack = 0x88UL;
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136 *pxTopOfStack = 0x99UL;
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138 *pxTopOfStack = 0xaaUL;
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140 *pxTopOfStack = 0xbbUL;
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144 /* Parameters in R4 then R3-R0. */
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145 // *pxTopOfStack = ( unsigned long ) pvParameters;
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146 // pxTopOfStack -= 5;
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148 *pxTopOfStack = 0x1UL;
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150 *pxTopOfStack = 0x2UL;
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152 *pxTopOfStack = 0x3UL;
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154 *pxTopOfStack = 0x4UL;
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156 *pxTopOfStack = 0x5UL;
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160 /* GBR = global base register.
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161 VBR = vector base register.
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162 TBR = jump table base register.
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163 R15 is the stack pointer. */
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165 return pxTopOfStack;
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167 /*-----------------------------------------------------------*/
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169 portBASE_TYPE xPortStartScheduler( void )
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171 /* Start the tick interrupt. */
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172 // prvSetupTimerInterrupt();
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174 /* Start the first task. */
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177 /* Should not get here. */
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180 /*-----------------------------------------------------------*/
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182 void vPortEndScheduler( void )
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184 /* Not implemented as there is nothing to return to. */
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186 /*-----------------------------------------------------------*/
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188 void vPortTickInterrupt( void )
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190 vTaskIncrementTick();
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191 #if configUSE_PREEMPTION == 1
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192 vTaskSwitchContext();
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195 /*-----------------------------------------------------------*/
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197 static void prvSetupTimerInterrupt( void )
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199 extern void vApplicationSetupTimerInterrupt( void );
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201 /* Call an application function to set up the timer. This way the application
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202 can decide which peripheral to use. A demo application is provided to show a
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203 suitable example. */
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204 vApplicationSetupTimerInterrupt();
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206 /*-----------------------------------------------------------*/
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