2 FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.
\r
4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
\r
5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
7 ***************************************************************************
\r
9 * FreeRTOS tutorial books are available in pdf and paperback. *
\r
10 * Complete, revised, and edited pdf reference manuals are also *
\r
13 * Purchasing FreeRTOS documentation will not only help you, by *
\r
14 * ensuring you get running as quickly as possible and with an *
\r
15 * in-depth knowledge of how to use FreeRTOS, it will also help *
\r
16 * the FreeRTOS project to continue with its mission of providing *
\r
17 * professional grade, cross platform, de facto standard solutions *
\r
18 * for microcontrollers - completely free of charge! *
\r
20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
\r
22 * Thank you for using FreeRTOS, and thank you for your support! *
\r
24 ***************************************************************************
\r
27 This file is part of the FreeRTOS distribution.
\r
29 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
30 the terms of the GNU General Public License (version 2) as published by the
\r
31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
\r
33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
\r
34 distribute a combined work that includes FreeRTOS without being obliged to
\r
35 provide the source code for proprietary components outside of the FreeRTOS
\r
38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
\r
39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
\r
40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
\r
41 details. You should have received a copy of the GNU General Public License
\r
42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
\r
43 viewed here: http://www.freertos.org/a00114.html and also obtained by
\r
44 writing to Real Time Engineers Ltd., contact details for whom are available
\r
45 on the FreeRTOS WEB site.
\r
49 ***************************************************************************
\r
51 * Having a problem? Start by reading the FAQ "My application does *
\r
52 * not run, what could be wrong?" *
\r
54 * http://www.FreeRTOS.org/FAQHelp.html *
\r
56 ***************************************************************************
\r
59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
\r
60 license and Real Time Engineers Ltd. contact details.
\r
62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
\r
64 fully thread aware and reentrant UDP/IP stack.
\r
66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
\r
67 Integrity Systems, who sell the code with commercial support,
\r
68 indemnification and middleware, under the OpenRTOS brand.
\r
70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
\r
71 engineered and independently SIL3 certified version for use in safety and
\r
72 mission critical applications that require provable dependability.
\r
75 /* Basic interrupt driven serial port driver for uart1.
\r
78 /* Standard includes. */
\r
81 /* Kernel includes. */
\r
82 #include "FreeRTOS.h"
\r
86 /* Demo application includes. */
\r
87 #include <machine/uart.h>
\r
88 #include <machine/ic.h>
\r
90 /*-----------------------------------------------------------*/
\r
92 #define comBLOCK_RETRY_TIME 10
\r
93 /*-----------------------------------------------------------*/
\r
95 /* The interrupt handlers are naked functions that call C handlers. The C
\r
96 handlers are marked as noinline to ensure they work correctly when the
\r
98 void interrupt5_handler( void ) __attribute__((naked));
\r
99 static void prvTxHandler( void ) __attribute__((noinline));
\r
100 void interrupt6_handler( void ) __attribute__((naked));
\r
101 static void prvRxHandler( void ) __attribute__((noinline));
\r
103 /*-----------------------------------------------------------*/
\r
105 /* Queues used to hold received characters, and characters waiting to be
\r
107 static xQueueHandle xRxedChars;
\r
108 static xQueueHandle xCharsForTx;
\r
109 extern unsigned portBASE_TYPE *pxVectorTable;
\r
110 /*-----------------------------------------------------------*/
\r
112 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
\r
114 /* Create the queues used to hold Rx and Tx characters. */
\r
115 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
116 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
118 if( ( xRxedChars ) && ( xCharsForTx ) )
\r
120 /* Set up interrupts */
\r
121 /* tx interrupt will be enabled when we need to send something */
\r
122 uart1->tx_mask = 0;
\r
123 uart1->rx_mask = 1;
\r
124 irq[IRQ_UART1_TX].ien = 1;
\r
125 irq[IRQ_UART1_TX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
\r
126 irq[IRQ_UART1_RX].ien = 1;
\r
127 irq[IRQ_UART1_RX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
\r
130 return ( xComPortHandle ) 0;
\r
132 /*-----------------------------------------------------------*/
\r
134 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
\r
136 /* The port handle is not required as this driver only supports uart1. */
\r
139 /* Get the next character from the buffer. Return false if no characters
\r
140 are available, or arrive before xBlockTime expires. */
\r
141 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
\r
150 /*-----------------------------------------------------------*/
\r
152 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
\r
155 signed char *pChNext;
\r
157 /* Send each character in the string, one at a time. */
\r
158 pChNext = ( signed char * )pcString;
\r
159 for( i = 0; i < usStringLength; i++ )
\r
161 /* Block until character has been transmitted. */
\r
162 while( xSerialPutChar( pxPort, *pChNext, comBLOCK_RETRY_TIME ) != pdTRUE ); pChNext++;
\r
165 /*-----------------------------------------------------------*/
\r
167 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
\r
171 /* Place the character in the queue of characters to be transmitted. */
\r
172 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
\r
177 /* Turn on the Tx interrupt so the ISR will remove the character from the
\r
178 queue and send it. This does not need to be in a critical section as
\r
179 if the interrupt has already removed the character the next interrupt
\r
180 will simply turn off the Tx interrupt again. */
\r
181 uart1->tx_mask = 1;
\r
185 /*-----------------------------------------------------------*/
\r
187 void vSerialClose( xComPortHandle xPort )
\r
189 /* Not supported as not required by the demo application. */
\r
192 /*-----------------------------------------------------------*/
\r
194 /* UART Tx interrupt handler. */
\r
195 void interrupt5_handler( void )
\r
197 /* This is a naked function. */
\r
198 portSAVE_CONTEXT();
\r
200 portRESTORE_CONTEXT();
\r
202 /*-----------------------------------------------------------*/
\r
204 static void prvTxHandler( void )
\r
207 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
\r
209 /* The interrupt was caused by the transmit fifo having space for at least one
\r
210 character. Are there any more characters to transmit? */
\r
211 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
\r
213 /* A character was retrieved from the queue so can be sent to the uart now. */
\r
214 uart1->tx_data = cChar;
\r
218 /* Queue empty, nothing to send so turn off the Tx interrupt. */
\r
219 uart1->tx_mask = 0;
\r
222 /* If an event caused a task to unblock then we call "Yield from ISR" to
\r
223 ensure that the unblocked task is the task that executes when the interrupt
\r
224 completes if the unblocked task has a priority higher than the interrupted
\r
226 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
\r
228 /*-----------------------------------------------------------*/
\r
230 /* UART Rx interrupt. */
\r
231 void interrupt6_handler( void )
\r
233 portSAVE_CONTEXT();
\r
235 portRESTORE_CONTEXT();
\r
237 /*-----------------------------------------------------------*/
\r
239 static void prvRxHandler( void )
\r
242 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
\r
244 /* The interrupt was caused by the receiver getting data. */
\r
245 cChar = uart1->rx_data;
\r
247 xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken );
\r
249 /* If an event caused a task to unblock then we call "Yield from ISR" to
\r
250 ensure that the unblocked task is the task that executes when the interrupt
\r
251 completes if the unblocked task has a priority higher than the interrupted
\r
253 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
\r
255 /*-----------------------------------------------------------*/
\r