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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [CORTEX_LM3S102_GCC/] [main.c] - Blame information for rev 596

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1 581 jeremybenn
/*
2
    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
    *                                                                         *
23
    ***************************************************************************
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.
30
    ***NOTE*** The exception to the GPL is included to allow you to distribute
31
    a combined work that includes FreeRTOS without being obliged to provide the
32
    source code for proprietary components outside of the FreeRTOS kernel.
33
    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
34
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
35
    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
37
    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
39
    by writing to Richard Barry, contact details for whom are available on the
40
    FreeRTOS WEB site.
41
 
42
    1 tab == 4 spaces!
43
 
44
    http://www.FreeRTOS.org - Documentation, latest information, license and
45
    contact details.
46
 
47
    http://www.SafeRTOS.com - A version that is certified for use in safety
48
    critical systems.
49
 
50
    http://www.OpenRTOS.com - Commercial support, development, porting,
51
    licensing and training services.
52
*/
53
 
54
/*
55
 * This demo application creates six co-routines and two tasks (three including
56
 * the idle task).  The co-routines execute as part of the idle task hook.
57
 *
58
 * Five of the created co-routines are the standard 'co-routine flash'
59
 * co-routines contained within the Demo/Common/Minimal/crflash.c file and
60
 * documented on the FreeRTOS.org WEB site.
61
 *
62
 * The 'LCD Task' rotates a string on the LCD, delaying between each character
63
 * as necessitated by the slow interface, and delaying between each string just
64
 * long enough to enable the text to be read.
65
 *
66
 * The sixth co-routine and final task control the transmission and reception
67
 * of a string to UART 0.  The co-routine periodically sends the first
68
 * character of the string to the UART, with the UART's TxEnd interrupt being
69
 * used to transmit the remaining characters.  The UART's RxEnd interrupt
70
 * receives the characters and places them on a queue to be processed by the
71
 * 'COMs Rx' task.  An error is latched should an unexpected character be
72
 * received, or any character be received out of sequence.
73
 *
74
 * A loopback connector is required to ensure that each character transmitted
75
 * on the UART is also received on the same UART.  For test purposes the UART
76
 * FIFO's are not utalised in order to maximise the interrupt overhead.  Also
77
 * a pseudo random interval is used between the start of each transmission in
78
 * order that the resultant interrupts are more randomly distributed and
79
 * therefore more likely to highlight any problems.
80
 *
81
 * The flash co-routines control LED's zero to four.  LED five is toggled each
82
 * time the string is transmitted on the UART.  LED six is toggled each time
83
 * the string is CORRECTLY received on the UART.  LED seven is latched on should
84
 * an error be detected in any task or co-routine.
85
 *
86
 * In addition the idle task makes repetative calls to
87
 * prvSetAndCheckRegisters().  This simply loads the general purpose registers
88
 * with a known value, then checks each register to ensure the held value is
89
 * still correct.  As a low priority task this checking routine is likely to
90
 * get repeatedly swapped in and out.  A register being found to contain an
91
 * incorrect value is therefore indicative of an error in the task switching
92
 * mechansim.
93
 *
94
 */
95
 
96
/* Scheduler include files. */
97
#include "FreeRTOS.h"
98
#include "task.h"
99
#include "queue.h"
100
#include "croutine.h"
101
 
102
/* Demo application include files. */
103
#include "partest.h"
104
#include "crflash.h"
105
 
106
/* Library include files. */
107
#include "DriverLib.h"
108
 
109
/* The time to delay between writing each character to the LCD. */
110
#define mainCHAR_WRITE_DELAY            ( 2 / portTICK_RATE_MS )
111
 
112
/* The time to delay between writing each string to the LCD. */
113
#define mainSTRING_WRITE_DELAY          ( 400 / portTICK_RATE_MS )
114
 
115
/* The number of flash co-routines to create. */
116
#define mainNUM_FLASH_CO_ROUTINES       ( 5 )
117
 
118
/* The length of the queue used to pass received characters to the Comms Rx
119
task. */
120
#define mainRX_QUEUE_LEN                        ( 5 )
121
 
122
/* The priority of the co-routine used to initiate the transmission of the
123
string on UART 0. */
124
#define mainTX_CO_ROUTINE_PRIORITY      ( 1 )
125
 
126
/* Only one co-routine is created so its index is not important. */
127
#define mainTX_CO_ROUTINE_INDEX         ( 0 )
128
 
129
/* The time between transmissions of the string on UART 0.   This is pseudo
130
random in order to generate a bit or randomness to when the interrupts occur.*/
131
#define mainMIN_TX_DELAY                        ( 40 / portTICK_RATE_MS )
132
#define mainMAX_TX_DELAY                        ( ( portTickType ) 0x7f )
133
#define mainOFFSET_TIME                         ( ( portTickType ) 3 )
134
 
135
/* The time the Comms Rx task should wait to receive a character.  This should
136
be slightly longer than the time between transmissions.  If we do not receive
137
a character after this time then there must be an error in the transmission or
138
the timing of the transmission. */
139
#define mainCOMMS_RX_DELAY                      ( mainMAX_TX_DELAY + 20 )
140
 
141
/* The task priorites. */
142
#define mainLCD_TASK_PRIORITY           ( tskIDLE_PRIORITY )
143
#define mainCOMMS_RX_TASK_PRIORITY      ( tskIDLE_PRIORITY + 1 )
144
 
145
/* The LED's toggled by the various tasks. */
146
#define mainCOMMS_FAIL_LED                      ( 7 )
147
#define mainCOMMS_RX_LED                        ( 6 )
148
#define mainCOMMS_TX_LED                        ( 5 )
149
 
150
/* The baud rate used by the UART comms tasks/co-routine. */
151
#define mainBAUD_RATE                           ( 57600 )
152
 
153
/* FIFO setting for the UART.  The FIFO is not used to create a better test. */
154
#define mainFIFO_SET                            ( 0x10 )
155
 
156
/* The string that is transmitted on the UART contains sequentially the
157
characters from mainFIRST_TX_CHAR to mainLAST_TX_CHAR. */
158
#define mainFIRST_TX_CHAR '0'
159
#define mainLAST_TX_CHAR 'z'
160
 
161
/* Just used to walk through the program memory in order that some random data
162
can be generated. */
163
#define mainTOTAL_PROGRAM_MEMORY ( ( unsigned long * ) ( 8 * 1024 ) )
164
#define mainFIRST_PROGRAM_BYTES ( ( unsigned long * ) 4 )
165
 
166
/* The error routine that is called if the driver library encounters an error. */
167
#ifdef DEBUG
168
void
169
__error__(char *pcFilename, unsigned long ulLine)
170
{
171
}
172
#endif
173
 
174
/*-----------------------------------------------------------*/
175
 
176
/*
177
 * The task that rotates text on the LCD.
178
 */
179
static void vLCDTask( void * pvParameters );
180
 
181
/*
182
 * The task that receives the characters from UART 0.
183
 */
184
static void vCommsRxTask( void * pvParameters );
185
 
186
/*
187
 * The co-routine that periodically initiates the transmission of the string on
188
 * the UART.
189
 */
190
static void vSerialTxCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex );
191
 
192
/*
193
 * Writes a string the the LCD.
194
 */
195
static void prvWriteString( const char *pcString );
196
 
197
/*
198
 * Initialisation routine for the UART.
199
 */
200
static void vSerialInit( void );
201
 
202
/*
203
 * Thread safe write to the PDC.
204
 */
205
static void prvPDCWrite( char cAddress, char cData );
206
 
207
/*
208
 * Function to simply set a known value into the general purpose registers
209
 * then read them back to ensure they remain set correctly.  An incorrect value
210
 * being indicative of an error in the task switching mechanism.
211
 */
212
void prvSetAndCheckRegisters( void );
213
 
214
/*
215
 * Latch the LED that indicates that an error has occurred.
216
 */
217
void vSetErrorLED( void );
218
 
219
/*
220
 * Sets up the PLL and ports used by the demo.
221
 */
222
static void prvSetupHardware( void );
223
 
224
/*-----------------------------------------------------------*/
225
 
226
/* Error flag set to pdFAIL if an error is encountered in the tasks/co-routines
227
defined within this file. */
228
unsigned portBASE_TYPE uxErrorStatus = pdPASS;
229
 
230
/* The next character to transmit. */
231
static char cNextChar;
232
 
233
/* The queue used to transmit characters from the interrupt to the Comms Rx
234
task. */
235
static xQueueHandle xCommsQueue;
236
 
237
/*-----------------------------------------------------------*/
238
 
239
void Main( void )
240
{
241
        /* Create the queue used to communicate between the UART ISR and the Comms
242
        Rx task. */
243
        xCommsQueue = xQueueCreate( mainRX_QUEUE_LEN, sizeof( char ) );
244
 
245
        /* Setup the ports used by the demo and the clock. */
246
        prvSetupHardware();
247
 
248
        /* Create the co-routines that flash the LED's. */
249
        vStartFlashCoRoutines( mainNUM_FLASH_CO_ROUTINES );
250
 
251
        /* Create the co-routine that initiates the transmission of characters
252
        on the UART. */
253
        xCoRoutineCreate( vSerialTxCoRoutine, mainTX_CO_ROUTINE_PRIORITY, mainTX_CO_ROUTINE_INDEX );
254
 
255
        /* Create the LCD and Comms Rx tasks. */
256
        xTaskCreate( vLCDTask, "LCD", configMINIMAL_STACK_SIZE, NULL, mainLCD_TASK_PRIORITY, NULL );
257
        xTaskCreate( vCommsRxTask, "CMS", configMINIMAL_STACK_SIZE, NULL, mainCOMMS_RX_TASK_PRIORITY, NULL );
258
 
259
        /* Start the scheduler running the tasks and co-routines just created. */
260
        vTaskStartScheduler();
261
 
262
        /* Should not get here unless we did not have enough memory to start the
263
        scheduler. */
264
        for( ;; );
265
}
266
/*-----------------------------------------------------------*/
267
 
268
static void prvSetupHardware( void )
269
{
270
        /* Setup the PLL. */
271
        SysCtlClockSet( SYSCTL_SYSDIV_10 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ );
272
 
273
        /* Initialise the hardware used to talk to the LCD, LED's and UART. */
274
        PDCInit();
275
        vParTestInitialise();
276
        vSerialInit();
277
}
278
/*-----------------------------------------------------------*/
279
 
280
void vApplicationIdleHook( void )
281
{
282
        /* The co-routines are executed in the idle task using the idle task
283
        hook. */
284
        for( ;; )
285
        {
286
                /* Schedule the co-routines. */
287
                vCoRoutineSchedule();
288
 
289
                /* Run the register check function between each co-routine. */
290
                prvSetAndCheckRegisters();
291
        }
292
}
293
/*-----------------------------------------------------------*/
294
 
295
static void prvWriteString( const char *pcString )
296
{
297
        /* Write pcString to the LED, pausing between each character. */
298
        prvPDCWrite(PDC_LCD_CSR, LCD_CLEAR);
299
        while( *pcString )
300
        {
301
                vTaskDelay( mainCHAR_WRITE_DELAY );
302
                prvPDCWrite( PDC_LCD_RAM, *pcString );
303
                pcString++;
304
        }
305
}
306
/*-----------------------------------------------------------*/
307
 
308
void vLCDTask( void * pvParameters )
309
{
310
unsigned portBASE_TYPE uxIndex;
311
const unsigned char ucCFGData[] = {
312
                                                                                        0x30,   /* Set data bus to 8-bits. */
313
                                                                                        0x30,
314
                                                                                        0x30,
315
                                                                                        0x3C,   /* Number of lines/font. */
316
                                                                                        0x08,   /* Display off. */
317
                                                                                        0x01,   /* Display clear. */
318
                                                                                        0x06,   /* Entry mode [cursor dir][shift]. */
319
                                                                                        0x0C    /* Display on [display on][curson on][blinking on]. */
320
                                                                          };
321
 
322
/* The strings that are written to the LCD. */
323
const char *pcStringsToDisplay[] = {
324
                                                                                        "Stellaris",
325
                                                                                        "Demo",
326
                                                                                        "One",
327
                                                                                        "www.FreeRTOS.org",
328
                                                                                        ""
329
                                                                           };
330
 
331
        /* Configure the LCD. */
332
        uxIndex = 0;
333
        while( uxIndex < sizeof( ucCFGData ) )
334
        {
335
                prvPDCWrite( PDC_LCD_CSR, ucCFGData[ uxIndex ] );
336
                uxIndex++;
337
                vTaskDelay( mainCHAR_WRITE_DELAY );
338
        }
339
 
340
        /* Turn the LCD Backlight on. */
341
        prvPDCWrite( PDC_CSR, 0x01 );
342
 
343
        /* Clear display. */
344
        vTaskDelay( mainCHAR_WRITE_DELAY );
345
        prvPDCWrite( PDC_LCD_CSR, LCD_CLEAR );
346
 
347
        uxIndex = 0;
348
        for( ;; )
349
        {
350
                /* Display the string on the LCD. */
351
                prvWriteString( pcStringsToDisplay[ uxIndex ] );
352
 
353
                /* Move on to the next string - wrapping if necessary. */
354
                uxIndex++;
355
                if( *( pcStringsToDisplay[ uxIndex ] ) == 0x00 )
356
                {
357
                        uxIndex = 0;
358
                        /* Longer pause on the last string to be sent. */
359
                        vTaskDelay( mainSTRING_WRITE_DELAY * 2 );
360
                }
361
 
362
                /* Wait until it is time to move onto the next string. */
363
                vTaskDelay( mainSTRING_WRITE_DELAY );
364
        }
365
}
366
/*-----------------------------------------------------------*/
367
 
368
static void vCommsRxTask( void * pvParameters )
369
{
370
static char cRxedChar, cExpectedChar;
371
 
372
        /* Set the char we expect to receive to the start of the string. */
373
        cExpectedChar = mainFIRST_TX_CHAR;
374
 
375
        for( ;; )
376
        {
377
                /* Wait for a character to be received. */
378
                xQueueReceive( xCommsQueue, ( void * ) &cRxedChar, mainCOMMS_RX_DELAY );
379
 
380
                /* Was the character recived (if any) the expected character. */
381
                if( cRxedChar != cExpectedChar )
382
                {
383
                        /* Got an unexpected character.  This can sometimes occur when
384
                        reseting the system using the debugger leaving characters already
385
                        in the UART regsters. */
386
                        uxErrorStatus = pdFAIL;
387
 
388
                        /* Resync by waiting for the end of the current string. */
389
                        while( cRxedChar != mainLAST_TX_CHAR )
390
                        {
391
                                while( !xQueueReceive( xCommsQueue, ( void * ) &cRxedChar, portMAX_DELAY ) );
392
                        }
393
 
394
                        /* The next expected character is the start of the string again. */
395
                        cExpectedChar = mainFIRST_TX_CHAR;
396
                }
397
                else
398
                {
399
                        if( cExpectedChar == mainLAST_TX_CHAR )
400
                        {
401
                                /* We have reached the end of the string - we now expect to
402
                                receive the first character in the string again.   The LED is
403
                                toggled to indicate that the entire string was received without
404
                                error. */
405
                                vParTestToggleLED( mainCOMMS_RX_LED );
406
                                cExpectedChar = mainFIRST_TX_CHAR;
407
                        }
408
                        else
409
                        {
410
                                /* We got the expected character, we now expect to receive the
411
                                next character in the string. */
412
                                cExpectedChar++;
413
                        }
414
                }
415
        }
416
}
417
/*-----------------------------------------------------------*/
418
 
419
static void vSerialTxCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex )
420
{
421
portTickType xDelayPeriod;
422
static unsigned long *pulRandomBytes = mainFIRST_PROGRAM_BYTES;
423
 
424
        /* Co-routine MUST start with a call to crSTART. */
425
        crSTART( xHandle );
426
 
427
        for(;;)
428
    {
429
                /* Was the previously transmitted string received correctly? */
430
                if( uxErrorStatus != pdPASS )
431
                {
432
                        /* An error was encountered so set the error LED. */
433
                        vSetErrorLED();
434
                }
435
 
436
                /* The next character to Tx is the first in the string. */
437
                cNextChar = mainFIRST_TX_CHAR;
438
 
439
                UARTIntDisable( UART0_BASE, UART_INT_TX );
440
                {
441
                        /* Send the first character. */
442
                        if( !( HWREG( UART0_BASE + UART_O_FR ) & UART_FR_TXFF ) )
443
                        {
444
                                HWREG( UART0_BASE + UART_O_DR ) = cNextChar;
445
                        }
446
 
447
                        /* Move the variable to the char to Tx on so the ISR transmits
448
                        the next character in the string once this one has completed. */
449
                        cNextChar++;
450
                }
451
                UARTIntEnable(UART0_BASE, UART_INT_TX);
452
 
453
                /* Toggle the LED to show a new string is being transmitted. */
454
        vParTestToggleLED( mainCOMMS_TX_LED );
455
 
456
                /* Delay before we start the string off again.  A pseudo-random delay
457
                is used as this will provide a better test. */
458
                xDelayPeriod = xTaskGetTickCount() + ( *pulRandomBytes );
459
 
460
                pulRandomBytes++;
461
                if( pulRandomBytes > mainTOTAL_PROGRAM_MEMORY )
462
                {
463
                        pulRandomBytes = mainFIRST_PROGRAM_BYTES;
464
                }
465
 
466
                /* Make sure we don't wait too long... */
467
                xDelayPeriod &= mainMAX_TX_DELAY;
468
 
469
                /* ...but we do want to wait. */
470
                if( xDelayPeriod < mainMIN_TX_DELAY )
471
                {
472
                        xDelayPeriod = mainMIN_TX_DELAY;
473
                }
474
 
475
                /* Block for the random(ish) time. */
476
                crDELAY( xHandle, xDelayPeriod );
477
    }
478
 
479
        /* Co-routine MUST end with a call to crEND. */
480
        crEND();
481
}
482
/*-----------------------------------------------------------*/
483
 
484
static void vSerialInit( void )
485
{
486
        /* Enable the UART.  GPIOA has already been initialised. */
487
        SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
488
 
489
        /* Set GPIO A0 and A1 as peripheral function.  They are used to output the
490
        UART signals. */
491
        GPIODirModeSet( GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1, GPIO_DIR_MODE_HW );
492
 
493
        /* Configure the UART for 8-N-1 operation. */
494
        UARTConfigSet( UART0_BASE, mainBAUD_RATE, UART_CONFIG_WLEN_8 | UART_CONFIG_PAR_NONE | UART_CONFIG_STOP_ONE );
495
 
496
        /* We dont want to use the fifo.  This is for test purposes to generate
497
        as many interrupts as possible. */
498
        HWREG( UART0_BASE + UART_O_LCR_H ) &= ~mainFIFO_SET;
499
 
500
        /* Enable both Rx and Tx interrupts. */
501
        HWREG( UART0_BASE + UART_O_IM ) |= ( UART_INT_TX | UART_INT_RX );
502
        IntEnable( INT_UART0 );
503
}
504
/*-----------------------------------------------------------*/
505
 
506
void vUART_ISR(void)
507
{
508
unsigned long ulStatus;
509
char cRxedChar;
510
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
511
 
512
        /* What caused the interrupt. */
513
        ulStatus = UARTIntStatus( UART0_BASE, pdTRUE );
514
 
515
        /* Clear the interrupt. */
516
        UARTIntClear( UART0_BASE, ulStatus );
517
 
518
        /* Was an Rx interrpt pending? */
519
        if( ulStatus & UART_INT_RX )
520
        {
521
                if( ( HWREG(UART0_BASE + UART_O_FR ) & UART_FR_RXFF ) )
522
                {
523
                        /* Get the char from the buffer and post it onto the queue of
524
                        Rxed chars.  Posting the character should wake the task that is
525
                        blocked on the queue waiting for characters. */
526
                        cRxedChar = ( char ) HWREG( UART0_BASE + UART_O_DR );
527
                        xQueueSendFromISR( xCommsQueue, &cRxedChar, &xHigherPriorityTaskWoken );
528
                }
529
        }
530
 
531
        /* Was a Tx interrupt pending? */
532
        if( ulStatus & UART_INT_TX )
533
        {
534
                /* Send the next character in the string.  We are not using the FIFO. */
535
                if( cNextChar <= mainLAST_TX_CHAR )
536
                {
537
                        if( !( HWREG( UART0_BASE + UART_O_FR ) & UART_FR_TXFF ) )
538
                        {
539
                                HWREG( UART0_BASE + UART_O_DR ) = cNextChar;
540
                        }
541
                        cNextChar++;
542
                }
543
        }
544
 
545
        /* If a task was woken by the character being received then we force
546
        a context switch to occur in case the task is of higher priority than
547
        the currently executing task (i.e. the task that this interrupt
548
        interrupted.) */
549
        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
550
}
551
/*-----------------------------------------------------------*/
552
 
553
static void prvPDCWrite( char cAddress, char cData )
554
{
555
        vTaskSuspendAll();
556
        {
557
                PDCWrite( cAddress, cData );
558
        }
559
        xTaskResumeAll();
560
}
561
/*-----------------------------------------------------------*/
562
 
563
void vSetErrorLED( void )
564
{
565
        vParTestSetLED( mainCOMMS_FAIL_LED, pdTRUE );
566
}
567
/*-----------------------------------------------------------*/
568
 
569
void prvSetAndCheckRegisters( void )
570
{
571
        /* Fill the general purpose registers with known values. */
572
        __asm volatile( "    mov r11, #10\n"
573
                  "    add r0, r11, #1\n"
574
                  "    add r1, r11, #2\n"
575
                        "    add r2, r11, #3\n"
576
                        "    add r3, r11, #4\n"
577
                        "    add r4, r11, #5\n"
578
                        "    add r5, r11, #6\n"
579
                        "    add r6, r11, #7\n"
580
                        "    add r7, r11, #8\n"
581
                        "    add r8, r11, #9\n"
582
                        "    add r9, r11, #10\n"
583
                        "    add r10, r11, #11\n"
584
                        "    add r12, r11, #12" );
585
 
586
        /* Check the values are as expected. */
587
        __asm volatile( "    cmp r11, #10\n"
588
                        "    bne set_error_led\n"
589
                        "    cmp r0, #11\n"
590
                        "    bne set_error_led\n"
591
                        "    cmp r1, #12\n"
592
                        "    bne set_error_led\n"
593
                        "    cmp r2, #13\n"
594
                        "    bne set_error_led\n"
595
                        "    cmp r3, #14\n"
596
                        "    bne set_error_led\n"
597
                        "    cmp r4, #15\n"
598
                        "    bne set_error_led\n"
599
                        "    cmp r5, #16\n"
600
                        "    bne set_error_led\n"
601
                        "    cmp r6, #17\n"
602
                        "    bne set_error_led\n"
603
                        "    cmp r7, #18\n"
604
                        "    bne set_error_led\n"
605
                        "    cmp r8, #19\n"
606
                        "    bne set_error_led\n"
607
                        "    cmp r9, #20\n"
608
                        "    bne set_error_led\n"
609
                        "    cmp r10, #21\n"
610
                        "    bne set_error_led\n"
611
                        "    cmp r12, #22\n"
612
                        "    bne set_error_led\n"
613
                        "    bx lr" );
614
 
615
  __asm volatile( "set_error_led:\n"
616
                        "    push {r14}\n"
617
                        "    ldr r1, =vSetErrorLED\n"
618
                        "    blx r1\n"
619
                        "    pop {r14}\n"
620
                        "    bx lr" );
621
}
622
/*-----------------------------------------------------------*/

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