begriffs open source - cmsis-freertos/blob - Demo/RL78_E2Studio_GCC/src/main

1 /*

2 * FreeRTOS Kernel V10.0.1

4 *

5 * Permission is hereby granted, free of charge, to any person obtaining a copy of

6 * this software and associated documentation files (the "Software"), to deal in

7 * the Software without restriction, including without limitation the rights to

8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

9 * the Software, and to permit persons to whom the Software is furnished to do so,

10 * subject to the following conditions:

11 *

12 * The above copyright notice and this permission notice shall be included in all

13 * copies or substantial portions of the Software.

14 *

15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS

17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR

18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER

19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

21 *

22 * http://www.FreeRTOS.org

23 * http://aws.amazon.com/freertos

24 *

25 * 1 tab == 4 spaces!

26 */

27

28 /******************************************************************************

29 * NOTE 1: This project provides two demo applications. A simple blinky style

30 * project, and a more comprehensive test and demo application. The

31 * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting in main.c is used to select

32 * between the two. See the notes on using mainCREATE_SIMPLE_BLINKY_DEMO_ONLY

33 * in main.c. This file implements the simply blinky style version.

34 *

35 * NOTE 2: This file only contains the source code that is specific to the

36 * basic demo. Generic functions, such FreeRTOS hook functions, and functions

37 * required to configure the hardware, along with an example interrupt service

38 * routine, are defined in main.c.

39 ******************************************************************************

40 *

41 * main_blinky() creates one queue, and two tasks. It then starts the

42 * scheduler.

43 *

44 * The Queue Send Task:

45 * The queue send task is implemented by the prvQueueSendTask() function in

46 * this file. prvQueueSendTask() sits in a loop that causes it to repeatedly

47 * block for 200 milliseconds, before sending the value 100 to the queue that

48 * was created within main_blinky(). Once the value is sent, the task loops

49 * back around to block for another 200 milliseconds.

50 *

51 * The Queue Receive Task:

52 * The queue receive task is implemented by the prvQueueReceiveTask() function

53 * in this file. prvQueueReceiveTask() sits in a loop where it repeatedly

54 * blocks on attempts to read data from the queue that was created within

55 * main_blinky(). When data is received, the task checks the value of the

56 * data, and if the value equals the expected 100, toggles the LED. The 'block

57 * time' parameter passed to the queue receive function specifies that the

58 * task should be held in the Blocked state indefinitely to wait for data to

59 * be available on the queue. The queue receive task will only leave the

60 * Blocked state when the queue send task writes to the queue. As the queue

61 * send task writes to the queue every 200 milliseconds, the queue receive

62 * task leaves the Blocked state every 200 milliseconds, and therefore toggles

63 * the LED every 200 milliseconds.

64 */

65

66 /* Standard includes. */

67 #include <stdio.h>

68

69 /* Kernel includes. */

70 #include "FreeRTOS.h"

71 #include "task.h"

72 #include "semphr.h"

73

74 /* Eval board specific definitions. */

75 #include "demo_specific_io.h"

76

77 /* Priorities at which the tasks are created. */

78 #define mainQUEUE_RECEIVE_TASK_PRIORITY ( tskIDLE_PRIORITY + 2 )

79 #define mainQUEUE_SEND_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )

80

81 /* The rate at which data is sent to the queue. The 200ms value is converted

82 to ticks using the portTICK_PERIOD_MS constant. */

83 #define mainQUEUE_SEND_FREQUENCY_MS ( 200 / portTICK_PERIOD_MS )

84

85 /* The number of items the queue can hold. This is 1 as the receive task

86 will remove items as they are added, meaning the send task should always find

87 the queue empty. */

88 #define mainQUEUE_LENGTH ( 1 )

89

90 /* Used to check the task parameter passing in both supported memory models. */

91 #define mainQUEUE_SEND_PARAMETER ( ( void * ) 0x1234U )

92 #define mainQUEUE_RECEIVE_PARAMETER ( ( void * ) 0x1122U )

93 /*-----------------------------------------------------------*/

94

95 /*

96 * The tasks as described in the comments at the top of this file.

97 */

98 static void prvQueueReceiveTask( void *pvParameters );

99 static void prvQueueSendTask( void *pvParameters );

100

101 /*

102 * Called by main() to create the simply blinky style application if

103 * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.

104 */

105 void main_blinky( void );

106

107 /*-----------------------------------------------------------*/

108

109 /* The queue used by both tasks. */

110 static QueueHandle_t xQueue = NULL;

111

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

113

114 void main_blinky( void )

115 {

116 /* Create the queue. */

117 xQueue = xQueueCreate( mainQUEUE_LENGTH, sizeof( unsigned long ) );

118

119 if( xQueue != NULL )

120 {

121 /* Start the two tasks as described in the comments at the top of this

122 file. */

123 xTaskCreate( prvQueueReceiveTask, /* The function that implements the task. */

124 "Rx", /* The text name assigned to the task - for debug only as it is not used by the kernel. */

125 configMINIMAL_STACK_SIZE, /* The size of the stack to allocate to the task. */

126 mainQUEUE_RECEIVE_PARAMETER, /* The parameter passed to the task - just used to check the port in this case. */

127 mainQUEUE_RECEIVE_TASK_PRIORITY,/* The priority assigned to the task. */

128 NULL ); /* The task handle is not required, so NULL is passed. */

129

130 xTaskCreate( prvQueueSendTask, "TX", configMINIMAL_STACK_SIZE, mainQUEUE_SEND_PARAMETER, mainQUEUE_SEND_TASK_PRIORITY, NULL );

131

132 /* Start the tasks and timer running. */

133 vTaskStartScheduler();

134 }

135

136 /* If all is well, the scheduler will now be running, and the following

137 line will never be reached. If the following line does execute, then

138 there was insufficient FreeRTOS heap memory available for the idle and/or

139 timer tasks to be created. See the memory management section on the

140 FreeRTOS web site for more details. http://www.freertos.org/a00111.html. */

141 for( ;; );

142 }

143 /*-----------------------------------------------------------*/

144

145 static void prvQueueSendTask( void *pvParameters )

146 {

147 TickType_t xNextWakeTime;

148 const unsigned long ulValueToSend = 100UL;

149

150 /* Check the parameter was passed in correctly. */

151 configASSERT( pvParameters == mainQUEUE_SEND_PARAMETER )

152

153 /* Initialise xNextWakeTime - this only needs to be done once. */

154 xNextWakeTime = xTaskGetTickCount();

155

156 for( ;; )

157 {

158 /* Place this task in the blocked state until it is time to run again. */

159 vTaskDelayUntil( &xNextWakeTime, mainQUEUE_SEND_FREQUENCY_MS );

160

161 /* Send to the queue - causing the queue receive task to unblock and

162 toggle the LED. 0 is used as the block time so the sending operation

163 will not block - it shouldn't need to block as the queue should always

164 be empty at this point in the code. */

165 xQueueSend( xQueue, &ulValueToSend, 0U );

166 }

167 }

168 /*-----------------------------------------------------------*/

169

170 static void prvQueueReceiveTask( void *pvParameters )

171 {

172 unsigned long ulReceivedValue;

173 const unsigned long ulExpectedValue = 100UL;

174

175 /* Check the parameter was passed in correctly. */

176 configASSERT( pvParameters == mainQUEUE_RECEIVE_PARAMETER )

177

178 for( ;; )

179 {

180 /* Wait until something arrives in the queue - this task will block

181 indefinitely provided INCLUDE_vTaskSuspend is set to 1 in

182 FreeRTOSConfig.h. */

183 xQueueReceive( xQueue, &ulReceivedValue, portMAX_DELAY );

184

185 /* To get here something must have been received from the queue, but

186 is it the expected value? If it is, toggle the LED. */

187 if( ulReceivedValue == ulExpectedValue )

188 {

189 LED_BIT = !LED_BIT;

190 ulReceivedValue = 0U;

191 }

192 }

193 }

194 /*-----------------------------------------------------------*/

195