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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [CORTEX_LM3S811_IAR/] [main.c] - Blame information for rev 610

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1 581 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
3
 
4
    ***************************************************************************
5
    *                                                                         *
6
    * If you are:                                                             *
7
    *                                                                         *
8
    *    + New to FreeRTOS,                                                   *
9
    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
10
    *    + Looking for basic training,                                        *
11
    *    + Wanting to improve your FreeRTOS skills and productivity           *
12
    *                                                                         *
13
    * then take a look at the FreeRTOS books - available as PDF or paperback  *
14
    *                                                                         *
15
    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
16
    *                  http://www.FreeRTOS.org/Documentation                  *
17
    *                                                                         *
18
    * A pdf reference manual is also available.  Both are usually delivered   *
19
    * to your inbox within 20 minutes to two hours when purchased between 8am *
20
    * and 8pm GMT (although please allow up to 24 hours in case of            *
21
    * exceptional circumstances).  Thank you for your support!                *
22
    *                                                                         *
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    ***************************************************************************
24
 
25
    This file is part of the FreeRTOS distribution.
26
 
27
    FreeRTOS is free software; you can redistribute it and/or modify it under
28
    the terms of the GNU General Public License (version 2) as published by the
29
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
36
    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
38
    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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/*
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 * This project contains an application demonstrating the use of the
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 * FreeRTOS.org mini real time scheduler on the Luminary Micro LM3S811 Eval
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 * board.  See http://www.FreeRTOS.org for more information.
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 *
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 * main() simply sets up the hardware, creates all the demo application tasks,
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 * then starts the scheduler.  http://www.freertos.org/a00102.html provides
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 * more information on the standard demo tasks.
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 *
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 * In addition to a subset of the standard demo application tasks, main.c also
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 * defines the following tasks:
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 *
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 * + A 'Print' task.  The print task is the only task permitted to access the
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 * LCD - thus ensuring mutual exclusion and consistent access to the resource.
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 * Other tasks do not access the LCD directly, but instead send the text they
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 * wish to display to the print task.  The print task spends most of its time
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 * blocked - only waking when a message is queued for display.
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 *
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 * + A 'Button handler' task.  The eval board contains a user push button that
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 * is configured to generate interrupts.  The interrupt handler uses a
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 * semaphore to wake the button handler task - demonstrating how the priority
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 * mechanism can be used to defer interrupt processing to the task level.  The
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 * button handler task sends a message both to the LCD (via the print task) and
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 * the UART where it can be viewed using a dumb terminal (via the UART to USB
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 * converter on the eval board).  NOTES:  The dumb terminal must be closed in
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 * order to reflash the microcontroller.  A very basic interrupt driven UART
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 * driver is used that does not use the FIFO.  19200 baud is used.
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 *
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 * + A 'check' task.  The check task only executes every five seconds but has a
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 * high priority so is guaranteed to get processor time.  Its function is to
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 * check that all the other tasks are still operational and that no errors have
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 * been detected at any time.  If no errors have every been detected 'PASS' is
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 * written to the display (via the print task) - if an error has ever been
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 * detected the message is changed to 'FAIL'.  The position of the message is
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 * changed for each write.
90
 */
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92
 
93
 
94
/* Environment includes. */
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#include "DriverLib.h"
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97
/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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#include "semphr.h"
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/* Demo app includes. */
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#include "integer.h"
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#include "PollQ.h"
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#include "semtest.h"
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#include "BlockQ.h"
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109
/* Delay between cycles of the 'check' task. */
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#define mainCHECK_DELAY                                         ( ( portTickType ) 5000 / portTICK_RATE_MS )
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112
/* UART configuration - note this does not use the FIFO so is not very
113
efficient. */
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#define mainBAUD_RATE                           ( 19200 )
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#define mainFIFO_SET                            ( 0x10 )
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/* Demo task priorities. */
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#define mainQUEUE_POLL_PRIORITY         ( tskIDLE_PRIORITY + 2 )
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#define mainCHECK_TASK_PRIORITY         ( tskIDLE_PRIORITY + 3 )
120
#define mainSEM_TEST_PRIORITY           ( tskIDLE_PRIORITY + 1 )
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#define mainBLOCK_Q_PRIORITY            ( tskIDLE_PRIORITY + 2 )
122
 
123
/* Demo board specifics. */
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#define mainPUSH_BUTTON             GPIO_PIN_4
125
 
126
/* Misc. */
127
#define mainQUEUE_SIZE                          ( 3 )
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#define mainDEBOUNCE_DELAY                      ( ( portTickType ) 150 / portTICK_RATE_MS )
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#define mainNO_DELAY                            ( ( portTickType ) 0 )
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/*
131
 * Configure the processor and peripherals for this demo.
132
 */
133
static void prvSetupHardware( void );
134
 
135
/*
136
 * The 'check' task, as described at the top of this file.
137
 */
138
static void vCheckTask( void *pvParameters );
139
 
140
/*
141
 * The task that is woken by the ISR that processes GPIO interrupts originating
142
 * from the push button.
143
 */
144
static void vButtonHandlerTask( void *pvParameters );
145
 
146
/*
147
 * The task that controls access to the LCD.
148
 */
149
static void vPrintTask( void *pvParameter );
150
 
151
/* String that is transmitted on the UART. */
152
static portCHAR *cMessage = "Task woken by button interrupt! --- ";
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static volatile portCHAR *pcNextChar;
154
 
155
/* The semaphore used to wake the button handler task from within the GPIO
156
interrupt handler. */
157
xSemaphoreHandle xButtonSemaphore;
158
 
159
/* The queue used to send strings to the print task for display on the LCD. */
160
xQueueHandle xPrintQueue;
161
 
162
/*-----------------------------------------------------------*/
163
 
164
int main( void )
165
{
166
        /* Configure the clocks, UART and GPIO. */
167
        prvSetupHardware();
168
 
169
        /* Create the semaphore used to wake the button handler task from the GPIO
170
        ISR. */
171
        vSemaphoreCreateBinary( xButtonSemaphore );
172
        xSemaphoreTake( xButtonSemaphore, 0 );
173
 
174
        /* Create the queue used to pass message to vPrintTask. */
175
        xPrintQueue = xQueueCreate( mainQUEUE_SIZE, sizeof( portCHAR * ) );
176
 
177
        /* Start the standard demo tasks. */
178
        vStartIntegerMathTasks( tskIDLE_PRIORITY );
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        vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
180
        vStartSemaphoreTasks( mainSEM_TEST_PRIORITY );
181
        vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
182
 
183
        /* Start the tasks defined within the file. */
184
        xTaskCreate( vCheckTask, "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
185
        xTaskCreate( vButtonHandlerTask, "Status", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY + 1, NULL );
186
        xTaskCreate( vPrintTask, "Print", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY - 1, NULL );
187
 
188
        /* Start the scheduler. */
189
        vTaskStartScheduler();
190
 
191
        /* Will only get here if there was insufficient heap to start the
192
        scheduler. */
193
 
194
        return 0;
195
}
196
/*-----------------------------------------------------------*/
197
 
198
static void vCheckTask( void *pvParameters )
199
{
200
portBASE_TYPE xErrorOccurred = pdFALSE;
201
portTickType xLastExecutionTime;
202
const portCHAR *pcPassMessage = "PASS";
203
const portCHAR *pcFailMessage = "FAIL";
204
 
205
        /* Initialise xLastExecutionTime so the first call to vTaskDelayUntil()
206
        works correctly. */
207
        xLastExecutionTime = xTaskGetTickCount();
208
 
209
        for( ;; )
210
        {
211
                /* Perform this check every mainCHECK_DELAY milliseconds. */
212
                vTaskDelayUntil( &xLastExecutionTime, mainCHECK_DELAY );
213
 
214
                /* Has an error been found in any task? */
215
 
216
                if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
217
                {
218
                        xErrorOccurred = pdTRUE;
219
                }
220
 
221
                if( xArePollingQueuesStillRunning() != pdTRUE )
222
                {
223
                        xErrorOccurred = pdTRUE;
224
                }
225
 
226
                if( xAreSemaphoreTasksStillRunning() != pdTRUE )
227
                {
228
                        xErrorOccurred = pdTRUE;
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                }
230
 
231
                if( xAreBlockingQueuesStillRunning() != pdTRUE )
232
                {
233
                        xErrorOccurred = pdTRUE;
234
                }
235
 
236
                /* Send either a pass or fail message.  If an error is found it is
237
                never cleared again.  We do not write directly to the LCD, but instead
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                queue a message for display by the print task. */
239
                if( xErrorOccurred == pdTRUE )
240
                {
241
                        xQueueSend( xPrintQueue, &pcFailMessage, portMAX_DELAY );
242
                }
243
                else
244
                {
245
                        xQueueSend( xPrintQueue, &pcPassMessage, portMAX_DELAY );
246
                }
247
        }
248
}
249
/*-----------------------------------------------------------*/
250
 
251
static void prvSetupHardware( void )
252
{
253
        /* Setup the PLL. */
254
        SysCtlClockSet( SYSCTL_SYSDIV_10 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ );
255
 
256
        /* Setup the push button. */
257
        SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
258
    GPIODirModeSet(GPIO_PORTC_BASE, mainPUSH_BUTTON, GPIO_DIR_MODE_IN);
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        GPIOIntTypeSet( GPIO_PORTC_BASE, mainPUSH_BUTTON,GPIO_FALLING_EDGE );
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        IntPrioritySet( INT_GPIOC, configKERNEL_INTERRUPT_PRIORITY );
261
        GPIOPinIntEnable( GPIO_PORTC_BASE, mainPUSH_BUTTON );
262
        IntEnable( INT_GPIOC );
263
 
264
 
265
 
266
        /* Enable the UART.  */
267
        SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
268
        SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
269
 
270
        /* Set GPIO A0 and A1 as peripheral function.  They are used to output the
271
        UART signals. */
272
        GPIODirModeSet( GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1, GPIO_DIR_MODE_HW );
273
 
274
        /* Configure the UART for 8-N-1 operation. */
275
        UARTConfigSetExpClk( UART0_BASE, SysCtlClockGet(), mainBAUD_RATE, UART_CONFIG_WLEN_8 | UART_CONFIG_PAR_NONE | UART_CONFIG_STOP_ONE );
276
 
277
        /* We don't want to use the fifo.  This is for test purposes to generate
278
        as many interrupts as possible. */
279
        HWREG( UART0_BASE + UART_O_LCR_H ) &= ~mainFIFO_SET;
280
 
281
        /* Enable Tx interrupts. */
282
        HWREG( UART0_BASE + UART_O_IM ) |= UART_INT_TX;
283
        IntPrioritySet( INT_UART0, configKERNEL_INTERRUPT_PRIORITY );
284
        IntEnable( INT_UART0 );
285
 
286
 
287
        /* Initialise the LCD> */
288
    OSRAMInit( false );
289
    OSRAMStringDraw("www.FreeRTOS.org", 0, 0);
290
        OSRAMStringDraw("LM3S811 demo", 16, 1);
291
}
292
/*-----------------------------------------------------------*/
293
 
294
static void vButtonHandlerTask( void *pvParameters )
295
{
296
const portCHAR *pcInterruptMessage = "Int";
297
 
298
        for( ;; )
299
        {
300
                /* Wait for a GPIO interrupt to wake this task. */
301
                while( xSemaphoreTake( xButtonSemaphore, portMAX_DELAY ) != pdPASS );
302
 
303
                /* Start the Tx of the message on the UART. */
304
                UARTIntDisable( UART0_BASE, UART_INT_TX );
305
                {
306
                        pcNextChar = cMessage;
307
 
308
                        /* Send the first character. */
309
                        if( !( HWREG( UART0_BASE + UART_O_FR ) & UART_FR_TXFF ) )
310
                        {
311
                                HWREG( UART0_BASE + UART_O_DR ) = *pcNextChar;
312
                        }
313
 
314
                        pcNextChar++;
315
                }
316
                UARTIntEnable(UART0_BASE, UART_INT_TX);
317
 
318
                /* Queue a message for the print task to display on the LCD. */
319
                xQueueSend( xPrintQueue, &pcInterruptMessage, portMAX_DELAY );
320
 
321
                /* Make sure we don't process bounces. */
322
                vTaskDelay( mainDEBOUNCE_DELAY );
323
                xSemaphoreTake( xButtonSemaphore, mainNO_DELAY );
324
        }
325
}
326
 
327
/*-----------------------------------------------------------*/
328
 
329
void vUART_ISR(void)
330
{
331
unsigned portLONG ulStatus;
332
 
333
        /* What caused the interrupt. */
334
        ulStatus = UARTIntStatus( UART0_BASE, pdTRUE );
335
 
336
        /* Clear the interrupt. */
337
        UARTIntClear( UART0_BASE, ulStatus );
338
 
339
        /* Was a Tx interrupt pending? */
340
        if( ulStatus & UART_INT_TX )
341
        {
342
                /* Send the next character in the string.  We are not using the FIFO. */
343
                if( *pcNextChar != NULL )
344
                {
345
                        if( !( HWREG( UART0_BASE + UART_O_FR ) & UART_FR_TXFF ) )
346
                        {
347
                                HWREG( UART0_BASE + UART_O_DR ) = *pcNextChar;
348
                        }
349
                        pcNextChar++;
350
                }
351
        }
352
}
353
/*-----------------------------------------------------------*/
354
 
355
void vGPIO_ISR( void )
356
{
357
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
358
 
359
        /* Clear the interrupt. */
360
        GPIOPinIntClear(GPIO_PORTC_BASE, mainPUSH_BUTTON);
361
 
362
        /* Wake the button handler task. */
363
        xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
364
        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
365
}
366
/*-----------------------------------------------------------*/
367
 
368
static void vPrintTask( void *pvParameters )
369
{
370
portCHAR *pcMessage;
371
unsigned portBASE_TYPE uxLine = 0, uxRow = 0;
372
 
373
        for( ;; )
374
        {
375
                /* Wait for a message to arrive. */
376
                xQueueReceive( xPrintQueue, &pcMessage, portMAX_DELAY );
377
 
378
                /* Write the message to the LCD. */
379
                uxRow++;
380
                uxLine++;
381
                OSRAMClear();
382
                OSRAMStringDraw( pcMessage, uxLine & 0x3f, uxRow & 0x01);
383
        }
384
}
385
 

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