2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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96 /* Scheduler includes. */
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97 #include "FreeRTOS.h"
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100 /*-----------------------------------------------------------
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101 * Implementation of functions defined in portable.h for the MSP430X port.
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102 *----------------------------------------------------------*/
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104 /* Constants required for hardware setup. The tick ISR runs off the ACLK,
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106 #define portACLK_FREQUENCY_HZ ( ( TickType_t ) 32768 )
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107 #define portINITIAL_CRITICAL_NESTING ( ( uint16_t ) 10 )
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108 #define portFLAGS_INT_ENABLED ( ( StackType_t ) 0x08 )
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110 /* We require the address of the pxCurrentTCB variable, but don't want to know
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111 any details of its type. */
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112 typedef void TCB_t;
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113 extern volatile TCB_t * volatile pxCurrentTCB;
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115 /* Each task maintains a count of the critical section nesting depth. Each
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116 time a critical section is entered the count is incremented. Each time a
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117 critical section is exited the count is decremented - with interrupts only
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118 being re-enabled if the count is zero.
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120 usCriticalNesting will get set to zero when the scheduler starts, but must
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121 not be initialised to zero as this will cause problems during the startup
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123 volatile uint16_t usCriticalNesting = portINITIAL_CRITICAL_NESTING;
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124 /*-----------------------------------------------------------*/
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128 * Sets up the periodic ISR used for the RTOS tick. This uses timer 0, but
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129 * could have alternatively used the watchdog timer or timer 1.
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131 void vPortSetupTimerInterrupt( void );
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132 /*-----------------------------------------------------------*/
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135 * Initialise the stack of a task to look exactly as if a call to
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136 * portSAVE_CONTEXT had been called.
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138 * See the header file portable.h.
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140 StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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142 uint16_t *pusTopOfStack;
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143 uint32_t *pulTopOfStack, ulTemp;
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146 Place a few bytes of known values on the bottom of the stack.
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147 This is just useful for debugging and can be included if required.
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149 *pxTopOfStack = ( StackType_t ) 0x1111;
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151 *pxTopOfStack = ( StackType_t ) 0x2222;
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153 *pxTopOfStack = ( StackType_t ) 0x3333;
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157 /* Data types are need either 16 bits or 32 bits depending on the data
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158 and code model used. */
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159 if( sizeof( pxCode ) == sizeof( uint16_t ) )
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161 pusTopOfStack = ( uint16_t * ) pxTopOfStack;
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162 ulTemp = ( uint32_t ) pxCode;
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163 *pusTopOfStack = ( uint16_t ) ulTemp;
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167 /* Make room for a 20 bit value stored as a 32 bit value. */
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168 pusTopOfStack = ( uint16_t * ) pxTopOfStack;
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170 pulTopOfStack = ( uint32_t * ) pusTopOfStack;
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171 *pulTopOfStack = ( uint32_t ) pxCode;
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175 *pusTopOfStack = portFLAGS_INT_ENABLED;
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176 pusTopOfStack -= ( sizeof( StackType_t ) / 2 );
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178 /* From here on the size of stacked items depends on the memory model. */
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179 pxTopOfStack = ( StackType_t * ) pusTopOfStack;
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181 /* Next the general purpose registers. */
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182 #ifdef PRELOAD_REGISTER_VALUES
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183 *pxTopOfStack = ( StackType_t ) 0xffff;
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185 *pxTopOfStack = ( StackType_t ) 0xeeee;
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187 *pxTopOfStack = ( StackType_t ) 0xdddd;
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189 *pxTopOfStack = ( StackType_t ) pvParameters;
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191 *pxTopOfStack = ( StackType_t ) 0xbbbb;
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193 *pxTopOfStack = ( StackType_t ) 0xaaaa;
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195 *pxTopOfStack = ( StackType_t ) 0x9999;
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197 *pxTopOfStack = ( StackType_t ) 0x8888;
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199 *pxTopOfStack = ( StackType_t ) 0x5555;
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201 *pxTopOfStack = ( StackType_t ) 0x6666;
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203 *pxTopOfStack = ( StackType_t ) 0x5555;
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205 *pxTopOfStack = ( StackType_t ) 0x4444;
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209 *pxTopOfStack = ( StackType_t ) pvParameters;
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213 /* A variable is used to keep track of the critical section nesting.
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214 This variable has to be stored as part of the task context and is
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215 initially set to zero. */
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216 *pxTopOfStack = ( StackType_t ) portNO_CRITICAL_SECTION_NESTING;
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218 /* Return a pointer to the top of the stack we have generated so this can
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219 be stored in the task control block for the task. */
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220 return pxTopOfStack;
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222 /*-----------------------------------------------------------*/
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224 void vPortEndScheduler( void )
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226 /* It is unlikely that the MSP430 port will get stopped. If required simply
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227 disable the tick interrupt here. */
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229 /*-----------------------------------------------------------*/
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232 * Hardware initialisation to generate the RTOS tick.
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234 void vPortSetupTimerInterrupt( void )
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236 vApplicationSetupTimerInterrupt();
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238 /*-----------------------------------------------------------*/
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240 #pragma vector=configTICK_VECTOR
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241 interrupt void vTickISREntry( void )
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243 extern void vPortTickISR( void );
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245 __bic_SR_register_on_exit( SCG1 + SCG0 + OSCOFF + CPUOFF );
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246 #if configUSE_PREEMPTION == 1
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247 extern void vPortPreemptiveTickISR( void );
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248 vPortPreemptiveTickISR();
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250 extern void vPortCooperativeTickISR( void );
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251 vPortCooperativeTickISR();
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