begriffs open source - cmsis-freertos/blob - Demo/NEC_78K0R

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

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45 participating in the support forum.

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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

70 /*

71 * This file defines the button push task and ISR as described at the top of

72 * main.c. The ISR is called from a wrapper function defined in ButtonISR.s26.

73 */

74

75 /* Kernel includes. */

76 #include "FreeRTOS.h"

77 #include "task.h"

78 #include "semphr.h"

79

80 /* The LED output used by the button push task. */

81 #define butLED1 P7_bit.no7

82

83 /* A short delay used for button debouncing. */

84 #define butDEBOUNCE_DELAY ( 200 / portTICK_PERIOD_MS )

85

86 /* The semaphore used to synchronise the button push task with the interrupt. */

87 static SemaphoreHandle_t xButtonSemaphore;

88

89 /*

90 * The definition of the button task itself. See the comments at the top of

91 * main.c.

92 */

93 void vButtonTask( void *pvParameters )

94 {

95 /* Ensure the semaphore is created before it gets used. */

96 vSemaphoreCreateBinary( xButtonSemaphore );

97

98 for( ;; )

99 {

100 /* Block on the semaphore to wait for an interrupt event. The semaphore

101 is 'given' from vButtonISRHandler() below. Using portMAX_DELAY as the

102 block time will cause the task to block indefinitely provided

103 INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h. */

104 xSemaphoreTake( xButtonSemaphore, portMAX_DELAY );

105

106 /* The button must have been pushed for this line to be executed.

107 Simply toggle the LED. */

108 butLED1 = !butLED1;

109

110 /* Wait a short time then clear any pending button pushes as a crude

111 method of debouncing the switch. xSemaphoreTake() uses a block time of

112 zero this time so it returns immediately rather than waiting for the

113 interrupt to occur. */

114 vTaskDelay( butDEBOUNCE_DELAY );

115 xSemaphoreTake( xButtonSemaphore, 0 );

116 }

117 }

118 /*-----------------------------------------------------------*/

119

120 /*

121 * The C portion of the interrupt handler. Interrupts are triggered by pushing

122 * the button on the target board. This interrupt can cause a context switch

123 * so has an assembly file wrapper defined within ButtonISR.s26.

124 */

125 void vButtonISRHandler( void )

126 {

127 short sHigherPriorityTaskWoken = pdFALSE;

128

129 /* 'Give' the semaphore to unblock the button task. */

130 xSemaphoreGiveFromISR( xButtonSemaphore, &sHigherPriorityTaskWoken );

131

132 /* If giving the semaphore unblocked a task, and the unblocked task has a

133 priority that is higher than the currently running task, then

134 sHigherPriorityTaskWoken will have been set to pdTRUE. Passing a pdTRUE

135 value to portYIELD_FROM_ISR() will cause this interrupt to return directly

136 to the higher priority unblocked task. */

137 portYIELD_FROM_ISR( sHigherPriorityTaskWoken );

138 }

139 /*-----------------------------------------------------------*/