]> git.sur5r.net Git - freertos/blob - FreeRTOS/Demo/ARM7_STR75x_GCC/serial/serialISR.c
Update FreeRTOS version number to V7.5.3
[freertos] / FreeRTOS / Demo / ARM7_STR75x_GCC / serial / serialISR.c
1 /*\r
2     FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd. \r
3     All rights reserved\r
4 \r
5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
6 \r
7     ***************************************************************************\r
8      *                                                                       *\r
9      *    FreeRTOS provides completely free yet professionally developed,    *\r
10      *    robust, strictly quality controlled, supported, and cross          *\r
11      *    platform software that has become a de facto standard.             *\r
12      *                                                                       *\r
13      *    Help yourself get started quickly and support the FreeRTOS         *\r
14      *    project by purchasing a FreeRTOS tutorial book, reference          *\r
15      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *\r
16      *                                                                       *\r
17      *    Thank you!                                                         *\r
18      *                                                                       *\r
19     ***************************************************************************\r
20 \r
21     This file is part of the FreeRTOS distribution.\r
22 \r
23     FreeRTOS is free software; you can redistribute it and/or modify it under\r
24     the terms of the GNU General Public License (version 2) as published by the\r
25     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
26 \r
27     >>! NOTE: The modification to the GPL is included to allow you to distribute\r
28     >>! a combined work that includes FreeRTOS without being obliged to provide\r
29     >>! the source code for proprietary components outside of the FreeRTOS\r
30     >>! kernel.\r
31 \r
32     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
33     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
34     FOR A PARTICULAR PURPOSE.  Full license text is available from the following\r
35     link: http://www.freertos.org/a00114.html\r
36 \r
37     1 tab == 4 spaces!\r
38 \r
39     ***************************************************************************\r
40      *                                                                       *\r
41      *    Having a problem?  Start by reading the FAQ "My application does   *\r
42      *    not run, what could be wrong?"                                     *\r
43      *                                                                       *\r
44      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
45      *                                                                       *\r
46     ***************************************************************************\r
47 \r
48     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
49     license and Real Time Engineers Ltd. contact details.\r
50 \r
51     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
52     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
53     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
54 \r
55     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
56     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
57     licenses offer ticketed support, indemnification and middleware.\r
58 \r
59     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
60     engineered and independently SIL3 certified version for use in safety and\r
61     mission critical applications that require provable dependability.\r
62 \r
63     1 tab == 4 spaces!\r
64 */\r
65 \r
66 /*-----------------------------------------------------------\r
67  * Components that can be compiled to either ARM or THUMB mode are\r
68  * contained in serial.c  The ISR routines, which can only be compiled\r
69  * to ARM mode, are contained in this file.\r
70  *----------------------------------------------------------*/\r
71 \r
72 \r
73 \r
74 /* Library includes. */\r
75 #include "75x_uart.h"\r
76 \r
77 /* Scheduler includes. */\r
78 #include "FreeRTOS.h"\r
79 #include "queue.h"\r
80 \r
81 static xQueueHandle xRxedChars;\r
82 static xQueueHandle xCharsForTx;\r
83 static portBASE_TYPE volatile *pxQueueEmpty;\r
84 \r
85 void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, portBASE_TYPE volatile *pxEmptyFlag )\r
86 {\r
87         xRxedChars = xQForRx;\r
88         xCharsForTx = xQForTx;\r
89         pxQueueEmpty = pxEmptyFlag;\r
90 }\r
91 /*-----------------------------------------------------------*/\r
92 \r
93 void vSerialISR( void )\r
94 {\r
95 signed char cChar;\r
96 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;\r
97 \r
98         do\r
99         {\r
100                 if( UART0->MIS & UART_IT_Transmit )\r
101                 {\r
102                         /* The interrupt was caused by the THR becoming empty.  Are there any\r
103                         more characters to transmit? */\r
104                         if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )\r
105                         {\r
106                                 /* A character was retrieved from the queue so can be sent to the\r
107                                 THR now. */\r
108                                 UART0->DR = cChar;\r
109                         }\r
110                         else\r
111                         {\r
112                                 *pxQueueEmpty = pdTRUE;         \r
113                         }               \r
114 \r
115                         UART_ClearITPendingBit( UART0, UART_IT_Transmit );\r
116                 }\r
117         \r
118                 if( UART0->MIS & UART_IT_Receive )\r
119                 {\r
120                         /* The interrupt was caused by a character being received.  Grab the\r
121                         character from the RHR and place it in the queue of received\r
122                         characters. */\r
123                         cChar = UART0->DR;\r
124                         xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );\r
125                         UART_ClearITPendingBit( UART0, UART_IT_Receive );\r
126                 }\r
127         } while( UART0->MIS );\r
128 \r
129         /* If a task was woken by either a character being received or a character\r
130         being transmitted then we may need to switch to another task. */\r
131         portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );\r
132 }\r
133 \r
134 \r