begriffs open source - cmsis-freertos/blob - Demo/ARM7_LPC2138

1 /*

4

5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

6

7 This file is part of the FreeRTOS distribution.

8

9 FreeRTOS is free software; you can redistribute it and/or modify it under

10 the terms of the GNU General Public License (version 2) as published by the

11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.

12

13 ***************************************************************************

14 >>! NOTE: The modification to the GPL is included to allow you to !<<

15 >>! distribute a combined work that includes FreeRTOS without being !<<

16 >>! obliged to provide the source code for proprietary components !<<

17 >>! outside of the FreeRTOS kernel. !<<

18 ***************************************************************************

19

20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY

21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

22 FOR A PARTICULAR PURPOSE. Full license text is available on the following

23 link: http://www.freertos.org/a00114.html

24

25 ***************************************************************************

26 * *

27 * FreeRTOS provides completely free yet professionally developed, *

28 * robust, strictly quality controlled, supported, and cross *

29 * platform software that is more than just the market leader, it *

30 * is the industry's de facto standard. *

31 * *

32 * Help yourself get started quickly while simultaneously helping *

33 * to support the FreeRTOS project by purchasing a FreeRTOS *

34 * tutorial book, reference manual, or both: *

35 * http://www.FreeRTOS.org/Documentation *

36 * *

37 ***************************************************************************

38

39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading

40 the FAQ page "My application does not run, what could be wrong?". Have you

41 defined configASSERT()?

42

43 http://www.FreeRTOS.org/support - In return for receiving this top quality

44 embedded software for free we request you assist our global community by

45 participating in the support forum.

46

47 http://www.FreeRTOS.org/training - Investing in training allows your team to

48 be as productive as possible as early as possible. Now you can receive

49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers

50 Ltd, and the world's leading authority on the world's leading RTOS.

51

52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,

53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS

54 compatible FAT file system, and our tiny thread aware UDP/IP stack.

55

56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.

57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

58

59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High

60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS

61 licenses offer ticketed support, indemnification and commercial middleware.

62

63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety

64 engineered and independently SIL3 certified version for use in safety and

65 mission critical applications that require provable dependability.

66

67 1 tab == 4 spaces!

68 */

69 #include "FreeRTOS.h"

70 #include "semphr.h"

71

72 #define isrCLEAR_EINT_1 2

73

74 /*

75 * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt

76 * generated by a push of the built in button. The wrapper takes care of

77 * the ISR entry. This then calls the actual handler function to perform

78 * the work. This work should not be done in the wrapper itself unless

79 * you are absolutely sure that no stack space is used.

80 */

81 void vButtonISRWrapper( void ) __attribute__ ((naked));

82 void vButtonHandler( void ) __attribute__ ((noinline));

83

84 void vButtonHandler( void )

85 {

86 extern SemaphoreHandle_t xButtonSemaphore;

87 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

88

89 xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );

90

91 if( xHigherPriorityTaskWoken )

92 {

93 /* We have woken a task. Calling "yield from ISR" here will ensure

94 the interrupt returns to the woken task if it has a priority higher

95 than the interrupted task. */

96 portYIELD_FROM_ISR();

97 }

98

99 EXTINT = isrCLEAR_EINT_1;

100 VICVectAddr = 0;

101 }

102 /*-----------------------------------------------------------*/

103

104 void vButtonISRWrapper( void )

105 {

106 /* Save the context of the interrupted task. */

107 portSAVE_CONTEXT();

108

109 /* Call the handler to do the work. This must be a separate function to

110 the wrapper to ensure the correct stack frame is set up. */

111 __asm volatile( "bl vButtonHandler" );

112

113 /* Restore the context of whichever task is going to run once the interrupt

114 completes. */

115 portRESTORE_CONTEXT();

116 }

117

118

119