2 FreeRTOS V7.4.0 - 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 itcan 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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75 /* Standard includes. */
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78 /* Kernel includes. */
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79 #include "FreeRTOS.h"
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82 /* Machine includes */
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83 #include <machine/counter.h>
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84 #include <machine/ic.h>
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85 /*-----------------------------------------------------------*/
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87 /* The initial PSR has the Previous Interrupt Enabled (PIEN) flag set. */
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88 #define portINITIAL_PSR ( 0x00020000 )
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90 /*-----------------------------------------------------------*/
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93 * Perform any hardware configuration necessary to generate the tick interrupt.
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95 static void prvSetupTimerInterrupt( void );
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96 /*-----------------------------------------------------------*/
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98 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE * pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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100 /* Make space on the stack for the context - this leaves a couple of spaces
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102 pxTopOfStack -= 20;
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104 /* Fill the registers with known values to assist debugging. */
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105 pxTopOfStack[ 16 ] = portKERNEL_INTERRUPT_PRIORITY_LEVEL;
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106 pxTopOfStack[ 15 ] = portINITIAL_PSR;
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107 pxTopOfStack[ 14 ] = ( unsigned long ) pxCode;
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108 pxTopOfStack[ 13 ] = 0x00000000UL; /* R15. */
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109 pxTopOfStack[ 12 ] = 0x00000000UL; /* R14. */
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110 pxTopOfStack[ 11 ] = 0x0d0d0d0dUL;
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111 pxTopOfStack[ 10 ] = 0x0c0c0c0cUL;
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112 pxTopOfStack[ 9 ] = 0x0b0b0b0bUL;
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113 pxTopOfStack[ 8 ] = 0x0a0a0a0aUL;
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114 pxTopOfStack[ 7 ] = 0x09090909UL;
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115 pxTopOfStack[ 6 ] = 0x08080808UL;
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116 pxTopOfStack[ 5 ] = 0x07070707UL;
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117 pxTopOfStack[ 4 ] = 0x06060606UL;
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118 pxTopOfStack[ 3 ] = 0x05050505UL;
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119 pxTopOfStack[ 2 ] = 0x04040404UL;
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120 pxTopOfStack[ 1 ] = 0x03030303UL;
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121 pxTopOfStack[ 0 ] = ( unsigned long ) pvParameters;
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123 return pxTopOfStack;
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125 /*-----------------------------------------------------------*/
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127 portBASE_TYPE xPortStartScheduler( void )
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129 /* Set-up the timer interrupt. */
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130 prvSetupTimerInterrupt();
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132 /* Enable the TRAP yield. */
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133 irq[ portIRQ_TRAP_YIELD ].ien = 1;
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134 irq[ portIRQ_TRAP_YIELD ].ipl = portKERNEL_INTERRUPT_PRIORITY_LEVEL;
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136 /* Integrated Interrupt Controller: Enable all interrupts. */
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139 /* Restore callee saved registers. */
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140 portRESTORE_CONTEXT();
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142 /* Should not get here. */
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145 /*-----------------------------------------------------------*/
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147 static void prvSetupTimerInterrupt( void )
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149 /* Enable timer interrupts */
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150 counter1->reload = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1;
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151 counter1->value = counter1->reload;
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152 counter1->mask = 1;
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154 /* Set the IRQ Handler priority and enable it. */
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155 irq[ IRQ_COUNTER1 ].ien = 1;
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156 irq[ IRQ_COUNTER1 ].ipl = portKERNEL_INTERRUPT_PRIORITY_LEVEL;
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158 /*-----------------------------------------------------------*/
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160 /* Trap 31 handler. */
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161 void interrupt31_handler( void ) __attribute__((naked));
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162 void interrupt31_handler( void )
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164 portSAVE_CONTEXT();
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165 __asm volatile ( "call vTaskSwitchContext" );
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166 portRESTORE_CONTEXT();
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168 /*-----------------------------------------------------------*/
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170 static void prvProcessTick( void ) __attribute__((noinline));
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171 static void prvProcessTick( void )
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173 vTaskIncrementTick();
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175 #if configUSE_PREEMPTION == 1
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176 vTaskSwitchContext();
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179 /* Clear the Tick Interrupt. */
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180 counter1->expired = 0;
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182 /*-----------------------------------------------------------*/
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184 /* Timer 1 interrupt handler, used for tick interrupt. */
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185 void interrupt7_handler( void ) __attribute__((naked));
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186 void interrupt7_handler( void )
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188 portSAVE_CONTEXT();
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190 portRESTORE_CONTEXT();
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192 /*-----------------------------------------------------------*/
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194 void vPortEndScheduler( void )
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196 /* Nothing to do. Unlikely to want to end. */
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198 /*-----------------------------------------------------------*/
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