2 FreeRTOS V6.0.5 - Copyright (C) 2010 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 /* Library includes. */
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65 /*-----------------------------------------------------------*/
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67 /* Dimensions the array into which the floating point context is saved.
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68 Allocate enough space for FPR0 to FPR15, FPUL and FPSCR, each of which is 4
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69 bytes big. If this number is changed then the 72 in portasm.src also needs
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71 #define portFLOP_REGISTERS_TO_STORE ( 18 )
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72 #define portFLOP_STORAGE_SIZE ( portFLOP_REGISTERS_TO_STORE * 4 )
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74 /* Tasks should start with interrupts enabled, therefore PSW is set with U,I,PM
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75 flags set and IPL clear. */
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76 #define portINITIAL_PSW ( ( portSTACK_TYPE ) 0x00130000 )
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77 #define portINITIAL_FPSW ( ( portSTACK_TYPE ) 0x00000100 )
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80 /*-----------------------------------------------------------*/
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85 void vPortYield( void );
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88 * Function to start the first task executing.
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90 void vPortStartFirstTask( void );
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92 /*-----------------------------------------------------------*/
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95 * See header file for description.
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97 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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99 /* R0 is not included as it is the stack pointer. */
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101 *pxTopOfStack = 0xdeadbeef;
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103 *pxTopOfStack = portINITIAL_PSW;
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105 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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107 *pxTopOfStack = 0xffffffff; /* r15. */
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109 *pxTopOfStack = 0xeeeeeeee;
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111 *pxTopOfStack = 0xdddddddd;
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113 *pxTopOfStack = 0xcccccccc;
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115 *pxTopOfStack = 0xbbbbbbbb;
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117 *pxTopOfStack = 0xaaaaaaaa;
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119 *pxTopOfStack = 0x99999999;
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121 *pxTopOfStack = 0x88888888;
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123 *pxTopOfStack = 0x77777777;
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125 *pxTopOfStack = 0x66666666;
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127 *pxTopOfStack = 0x55555555;
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129 *pxTopOfStack = 0x44444444;
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131 *pxTopOfStack = 0x33333333;
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133 *pxTopOfStack = 0x22222222;
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135 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R1 */
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137 *pxTopOfStack = portINITIAL_FPSW;
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139 *pxTopOfStack = 0x12345678; /* Accumulator. */
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141 *pxTopOfStack = 0x87654321; /* Accumulator. */
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143 return pxTopOfStack;
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145 /*-----------------------------------------------------------*/
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147 portBASE_TYPE xPortStartScheduler( void )
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149 extern void vApplicationSetupTimerInterrupt( void );
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151 /* Call an application function to set up the timer that will generate the
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152 tick interrupt. This way the application can decide which peripheral to
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153 use. A demo application is provided to show a suitable example. */
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154 vApplicationSetupTimerInterrupt();
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156 /* Start the first task. This will only restore the standard registers and
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157 not the flop registers. This does not really matter though because the only
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158 flop register that is initialised to a particular value is fpscr, and it is
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159 only initialised to the current value, which will still be the current value
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160 when the first task starts executing. */
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161 //trapa( portSTART_SCHEDULER_TRAP_NO );
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163 /* Should not get here. */
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166 /*-----------------------------------------------------------*/
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168 void vPortEndScheduler( void )
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170 /* Not implemented as there is nothing to return to. */
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172 /*-----------------------------------------------------------*/
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174 void vPortYield( void )
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177 /*-----------------------------------------------------------*/
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