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31 + The created tasks now include calls to tskYIELD(), allowing them to be used
32 + with the cooperative scheduler.
36 * This does the same as flop. c, but uses variables of type long instead of
39 * As with flop. c, the tasks created in this file are a good test of the
40 * scheduler context switch mechanism. The processor has to access 32bit
41 * variables in two or four chunks (depending on the processor). The low
42 * priority of these tasks means there is a high probability that a context
43 * switch will occur mid calculation. See the flop. c documentation for
46 * \page IntegerC integer.c
54 + The constants used in the calculations are larger to ensure the
55 + optimiser does not truncate them to 16 bits.
60 /* Scheduler include files. */
65 /* Demo program include files. */
68 #define intgSTACK_SIZE ( ( unsigned short ) 256 )
69 #define intgNUMBER_OF_TASKS ( 8 )
71 /* Four tasks, each of which performs a different calculation on four byte
72 * variables. Each of the four is created twice. */
73 static void vCompeteingIntMathTask1( void * pvParameters );
74 static void vCompeteingIntMathTask2( void * pvParameters );
75 static void vCompeteingIntMathTask3( void * pvParameters );
76 static void vCompeteingIntMathTask4( void * pvParameters );
78 /* These variables are used to check that all the tasks are still running. If a
79 * task gets a calculation wrong it will stop incrementing its check variable. */
80 static volatile unsigned short usTaskCheck[ intgNUMBER_OF_TASKS ] = { ( unsigned short ) 0 };
81 /*-----------------------------------------------------------*/
83 void vStartIntegerMathTasks( unsigned portBASE_TYPE uxPriority )
85 xTaskCreate( vCompeteingIntMathTask1, "IntMath1", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 0 ] ), uxPriority, NULL );
86 xTaskCreate( vCompeteingIntMathTask2, "IntMath2", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 1 ] ), uxPriority, NULL );
87 xTaskCreate( vCompeteingIntMathTask3, "IntMath3", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 2 ] ), uxPriority, NULL );
88 xTaskCreate( vCompeteingIntMathTask4, "IntMath4", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 3 ] ), uxPriority, NULL );
89 xTaskCreate( vCompeteingIntMathTask1, "IntMath5", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 4 ] ), uxPriority, NULL );
90 xTaskCreate( vCompeteingIntMathTask2, "IntMath6", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 5 ] ), uxPriority, NULL );
91 xTaskCreate( vCompeteingIntMathTask3, "IntMath7", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 6 ] ), uxPriority, NULL );
92 xTaskCreate( vCompeteingIntMathTask4, "IntMath8", intgSTACK_SIZE, ( void * ) &( usTaskCheck[ 7 ] ), uxPriority, NULL );
94 /*-----------------------------------------------------------*/
96 static void vCompeteingIntMathTask1( void * pvParameters )
99 short sError = pdFALSE;
100 volatile unsigned short * pusTaskCheckVariable;
101 const long lAnswer = ( ( long ) 74565L + ( long ) 1234567L ) * ( long ) -918L;
102 const char * const pcTaskStartMsg = "Integer math task 1 started.\r\n";
103 const char * const pcTaskFailMsg = "Integer math task 1 failed.\r\n";
105 /* Queue a message for printing to say the task has started. */
106 vPrintDisplayMessage( &pcTaskStartMsg );
108 /* The variable this task increments to show it is still running is passed in
109 * as the parameter. */
110 pusTaskCheckVariable = ( unsigned short * ) pvParameters;
112 /* Keep performing a calculation and checking the result against a constant. */
115 l1 = ( long ) 74565L;
116 l2 = ( long ) 1234567L;
119 l4 = ( l1 + l2 ) * l3;
123 /* If the calculation does not match the expected constant, stop the
124 * increment of the check variable. */
127 vPrintDisplayMessage( &pcTaskFailMsg );
131 if( sError == pdFALSE )
133 /* If the calculation has always been correct, increment the check
134 * variable so we know this task is still running okay. */
135 ( *pusTaskCheckVariable )++;
139 /*-----------------------------------------------------------*/
141 static void vCompeteingIntMathTask2( void * pvParameters )
144 short sError = pdFALSE;
145 volatile unsigned short * pusTaskCheckVariable;
146 const long lAnswer = ( ( long ) -389000L / ( long ) 329999L ) * ( long ) -89L;
147 const char * const pcTaskStartMsg = "Integer math task 2 started.\r\n";
148 const char * const pcTaskFailMsg = "Integer math task 2 failed.\r\n";
150 /* Queue a message for printing to say the task has started. */
151 vPrintDisplayMessage( &pcTaskStartMsg );
153 /* The variable this task increments to show it is still running is passed in
154 * as the parameter. */
155 pusTaskCheckVariable = ( unsigned short * ) pvParameters;
157 /* Keep performing a calculation and checking the result against a constant. */
164 l4 = ( l1 / l2 ) * l3;
168 /* If the calculation does not match the expected constant, stop the
169 * increment of the check variable. */
172 vPrintDisplayMessage( &pcTaskFailMsg );
176 if( sError == pdFALSE )
178 /* If the calculation has always been correct, increment the check
179 * variable so we know this task is still running okay. */
180 ( *pusTaskCheckVariable )++;
184 /*-----------------------------------------------------------*/
186 static void vCompeteingIntMathTask3( void * pvParameters )
188 long * plArray, lTotal1, lTotal2;
189 short sError = pdFALSE;
190 volatile unsigned short * pusTaskCheckVariable;
191 const unsigned short usArraySize = ( unsigned short ) 250;
192 unsigned short usPosition;
193 const char * const pcTaskStartMsg = "Integer math task 3 started.\r\n";
194 const char * const pcTaskFailMsg = "Integer math task 3 failed.\r\n";
196 /* Queue a message for printing to say the task has started. */
197 vPrintDisplayMessage( &pcTaskStartMsg );
199 /* The variable this task increments to show it is still running is passed in
200 * as the parameter. */
201 pusTaskCheckVariable = ( unsigned short * ) pvParameters;
203 /* Create the array we are going to use for our check calculation. */
204 plArray = ( long * ) pvPortMalloc( ( size_t ) 250 * sizeof( long ) );
206 /* Keep filling the array, keeping a running total of the values placed in the
207 * array. Then run through the array adding up all the values. If the two totals
208 * do not match, stop the check variable from incrementing. */
211 lTotal1 = ( long ) 0;
212 lTotal2 = ( long ) 0;
214 for( usPosition = 0; usPosition < usArraySize; usPosition++ )
216 plArray[ usPosition ] = ( long ) usPosition + ( long ) 5;
217 lTotal1 += ( long ) usPosition + ( long ) 5;
222 for( usPosition = 0; usPosition < usArraySize; usPosition++ )
224 lTotal2 += plArray[ usPosition ];
227 if( lTotal1 != lTotal2 )
229 vPrintDisplayMessage( &pcTaskFailMsg );
235 if( sError == pdFALSE )
237 /* If the calculation has always been correct, increment the check
238 * variable so we know this task is still running okay. */
239 ( *pusTaskCheckVariable )++;
243 /*-----------------------------------------------------------*/
245 static void vCompeteingIntMathTask4( void * pvParameters )
247 long * plArray, lTotal1, lTotal2;
248 short sError = pdFALSE;
249 volatile unsigned short * pusTaskCheckVariable;
250 const unsigned short usArraySize = 250;
251 unsigned short usPosition;
252 const char * const pcTaskStartMsg = "Integer math task 4 started.\r\n";
253 const char * const pcTaskFailMsg = "Integer math task 4 failed.\r\n";
255 /* Queue a message for printing to say the task has started. */
256 vPrintDisplayMessage( &pcTaskStartMsg );
258 /* The variable this task increments to show it is still running is passed in
259 * as the parameter. */
260 pusTaskCheckVariable = ( unsigned short * ) pvParameters;
262 /* Create the array we are going to use for our check calculation. */
263 plArray = ( long * ) pvPortMalloc( ( size_t ) 250 * sizeof( long ) );
265 /* Keep filling the array, keeping a running total of the values placed in the
266 * array. Then run through the array adding up all the values. If the two totals
267 * do not match, stop the check variable from incrementing. */
270 lTotal1 = ( long ) 0;
271 lTotal2 = ( long ) 0;
273 for( usPosition = 0; usPosition < usArraySize; usPosition++ )
275 plArray[ usPosition ] = ( long ) usPosition * ( long ) 12;
276 lTotal1 += ( long ) usPosition * ( long ) 12;
281 for( usPosition = 0; usPosition < usArraySize; usPosition++ )
283 lTotal2 += plArray[ usPosition ];
286 if( lTotal1 != lTotal2 )
288 vPrintDisplayMessage( &pcTaskFailMsg );
294 if( sError == pdFALSE )
296 /* If the calculation has always been correct, increment the check
297 * variable so we know this task is still running okay. */
298 ( *pusTaskCheckVariable )++;
302 /*-----------------------------------------------------------*/
304 /* This is called to check that all the created tasks are still running. */
305 portBASE_TYPE xAreIntegerMathsTaskStillRunning( void )
307 /* Keep a history of the check variables so we know if they have been incremented
308 * since the last call. */
309 static unsigned short usLastTaskCheck[ intgNUMBER_OF_TASKS ] = { ( unsigned short ) 0 };
310 portBASE_TYPE xReturn = pdTRUE, xTask;
312 /* Check the maths tasks are still running by ensuring their check variables
313 * are still incrementing. */
314 for( xTask = 0; xTask < intgNUMBER_OF_TASKS; xTask++ )
316 if( usTaskCheck[ xTask ] == usLastTaskCheck[ xTask ] )
318 /* The check has not incremented so an error exists. */
322 usLastTaskCheck[ xTask ] = usTaskCheck[ xTask ];