begriffs open source - cmsis-freertos/blob

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

70 /**

71 * Manages a queue of strings that are waiting to be displayed. This is used to

72 * ensure mutual exclusion of console output.

73 *

74 * A task wishing to display a message will call vPrintDisplayMessage (), with a

75 * pointer to the string as the parameter. The pointer is posted onto the

76 * xPrintQueue queue.

77 *

78 * The task spawned in main. c blocks on xPrintQueue. When a message becomes

79 * available it calls pcPrintGetNextMessage () to obtain a pointer to the next

80 * string, then uses the functions defined in the portable layer FileIO. c to

81 * display the message.

82 *

83 * <b>NOTE:</b>

84 * Using console IO can disrupt real time performance - depending on the port.

85 * Standard C IO routines are not designed for real time applications. While

86 * standard IO is useful for demonstration and debugging an alternative method

87 * should be used if you actually require console IO as part of your application.

88 *

89 * \page PrintC print.c

90 * \ingroup DemoFiles

91 * <HR>

92 */

93

94 /*

95 Changes from V2.0.0

96

97 + Delay periods are now specified using variables and constants of

98 TickType_t rather than unsigned long.

99 */

100

101 #include <stdlib.h>

102

103 /* Scheduler include files. */

104 #include "FreeRTOS.h"

105 #include "queue.h"

106

107 /* Demo program include files. */

108 #include "print.h"

109

110 static QueueHandle_t xPrintQueue;

111

112 /*-----------------------------------------------------------*/

113

114 void vPrintInitialise( void )

115 {

116 const unsigned portBASE_TYPE uxQueueSize = 20;

117

118 /* Create the queue on which errors will be reported. */

119 xPrintQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( char * ) );

120 }

121 /*-----------------------------------------------------------*/

122

123 void vPrintDisplayMessage( const char * const * ppcMessageToSend )

124 {

125 #ifdef USE_STDIO

126 xQueueSend( xPrintQueue, ( void * ) ppcMessageToSend, ( TickType_t ) 0 );

127 #else

128 /* Stop warnings. */

129 ( void ) ppcMessageToSend;

130 #endif

131 }

132 /*-----------------------------------------------------------*/

133

134 const char *pcPrintGetNextMessage( TickType_t xPrintRate )

135 {

136 char *pcMessage;

137

138 if( xQueueReceive( xPrintQueue, &pcMessage, xPrintRate ) == pdPASS )

139 {

140 return pcMessage;

141 }

142 else

143 {

144 return NULL;

145 }

146 }

147

148