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

1 /*

4

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

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7 This file is part of the FreeRTOS distribution.

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

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

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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

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

26 * *

27 * FreeRTOS provides completely free yet professionally developed, *

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

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38

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65 mission critical applications that require provable dependability.

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67 1 tab == 4 spaces!

68 */

69

70 /* Scheduler include files. */

71 #include "FreeRTOS.h"

72 #include "task.h"

73 #include "queue.h"

74

75 /* Constants required for interrupt management. */

76 #define tcpCLEAR_VIC_INTERRUPT ( 0 )

77 #define tcpEINT0_VIC_CHANNEL_BIT ( ( unsigned long ) 0x4000 )

78

79 /* EINT0 interrupt handler. This processes interrupts from the WIZnet device. */

80 void vEINT0_ISR_Wrapper( void ) __attribute__((naked));

81

82 /* The handler that goes with the EINT0 wrapper. */

83 void vEINT0_ISR_Handler( void );

84

85 /* Variable is required for its address, but does not otherwise get used. */

86 static long lDummyVariable;

87

88 /*

89 * When the WIZnet device asserts an interrupt we send an (empty) message to

90 * the TCP task. This wakes the task so the interrupt can be processed. The

91 * source of the interrupt has to be ascertained by the TCP task as this

92 * requires an I2C transaction which cannot be performed from this ISR.

93 * Note this code predates the introduction of semaphores, a semaphore should

94 * be used in place of the empty queue message.

95 */

96 void vEINT0_ISR_Handler( void )

97 {

98 extern QueueHandle_t xTCPISRQueue;

99 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

100

101 /* Just wake the TCP task so it knows an ISR has occurred. */

102 xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );

103

104 /* We cannot carry on processing interrupts until the TCP task has

105 processed this one - so for now interrupts are disabled. The TCP task will

106 re-enable it. */

107 VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;

108

109 /* Clear the interrupt bit. */

110 VICVectAddr = tcpCLEAR_VIC_INTERRUPT;

111

112 if( xHigherPriorityTaskWoken )

113 {

114 portYIELD_FROM_ISR();

115 }

116 }

117 /*-----------------------------------------------------------*/

118

119 void vEINT0_ISR_Wrapper( void )

120 {

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

122 portSAVE_CONTEXT();

123

124 /* The handler must be a separate function from the wrapper to

125 ensure the correct stack frame is set up. */

126 vEINT0_ISR_Handler();

127

128 /* Restore the context of whichever task is going to run next. */

129 portRESTORE_CONTEXT();

130 }

131

132