2 FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
\r
4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
6 ***************************************************************************
\r
8 * FreeRTOS provides completely free yet professionally developed, *
\r
9 * robust, strictly quality controlled, supported, and cross *
\r
10 * platform software that has become a de facto standard. *
\r
12 * Help yourself get started quickly and support the FreeRTOS *
\r
13 * project by purchasing a FreeRTOS tutorial book, reference *
\r
14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
\r
18 ***************************************************************************
\r
20 This file is part of the FreeRTOS distribution.
\r
22 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
23 the terms of the GNU General Public License (version 2) as published by the
\r
24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
\r
26 >>! NOTE: The modification to the GPL is included to allow you to distribute
\r
27 >>! a combined work that includes FreeRTOS without being obliged to provide
\r
28 >>! the source code for proprietary components outside of the FreeRTOS
\r
31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
\r
32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
\r
33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
\r
34 link: http://www.freertos.org/a00114.html
\r
38 ***************************************************************************
\r
40 * Having a problem? Start by reading the FAQ "My application does *
\r
41 * not run, what could be wrong?" *
\r
43 * http://www.FreeRTOS.org/FAQHelp.html *
\r
45 ***************************************************************************
\r
47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
\r
48 license and Real Time Engineers Ltd. contact details.
\r
50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
\r
52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
\r
54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
\r
55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
\r
56 licenses offer ticketed support, indemnification and middleware.
\r
58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
\r
59 engineered and independently SIL3 certified version for use in safety and
\r
60 mission critical applications that require provable dependability.
\r
66 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
\r
68 NOTE: This driver is primarily to test the scheduler functionality. It does
\r
69 not effectively use the buffers or DMA and is therefore not intended to be
\r
70 an example of an efficient driver. */
\r
72 /* Standard include file. */
\r
75 /* Scheduler include files. */
\r
76 #include "FreeRTOS.h"
\r
80 /* Demo app include files. */
\r
83 /* Hardware setup. */
\r
86 #define serLOW_SPEED 0
\r
87 #define serONE_STOP_BIT 0
\r
88 #define serEIGHT_DATA_BITS_NO_PARITY 0
\r
89 #define serNORMAL_IDLE_STATE 0
\r
90 #define serAUTO_BAUD_OFF 0
\r
91 #define serLOOPBACK_OFF 0
\r
92 #define serWAKE_UP_DISABLE 0
\r
93 #define serNO_HARDWARE_FLOW_CONTROL 0
\r
94 #define serSTANDARD_IO 0
\r
95 #define serNO_IRDA 0
\r
96 #define serCONTINUE_IN_IDLE_MODE 0
\r
97 #define serUART_ENABLED 1
\r
98 #define serINTERRUPT_ON_SINGLE_CHAR 0
\r
99 #define serTX_ENABLE 1
\r
100 #define serINTERRUPT_ENABLE 1
\r
101 #define serINTERRUPT_DISABLE 0
\r
102 #define serCLEAR_FLAG 0
\r
103 #define serSET_FLAG 1
\r
106 /* The queues used to communicate between tasks and ISR's. */
\r
107 static xQueueHandle xRxedChars;
\r
108 static xQueueHandle xCharsForTx;
\r
110 static portBASE_TYPE xTxHasEnded;
\r
111 /*-----------------------------------------------------------*/
\r
113 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
\r
117 /* Create the queues used by the com test task. */
\r
118 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
119 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
121 /* Setup the UART. */
\r
122 U2MODEbits.BRGH = serLOW_SPEED;
\r
123 U2MODEbits.STSEL = serONE_STOP_BIT;
\r
124 U2MODEbits.PDSEL = serEIGHT_DATA_BITS_NO_PARITY;
\r
125 U2MODEbits.ABAUD = serAUTO_BAUD_OFF;
\r
126 U2MODEbits.LPBACK = serLOOPBACK_OFF;
\r
127 U2MODEbits.WAKE = serWAKE_UP_DISABLE;
\r
128 U2MODEbits.UEN = serNO_HARDWARE_FLOW_CONTROL;
\r
129 U2MODEbits.IREN = serNO_IRDA;
\r
130 U2MODEbits.USIDL = serCONTINUE_IN_IDLE_MODE;
\r
131 U2MODEbits.UARTEN = serUART_ENABLED;
\r
133 U2BRG = (unsigned short)(( (float)configCPU_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
\r
135 U2STAbits.URXISEL = serINTERRUPT_ON_SINGLE_CHAR;
\r
136 U2STAbits.UTXEN = serTX_ENABLE;
\r
137 U2STAbits.UTXINV = serNORMAL_IDLE_STATE;
\r
138 U2STAbits.UTXISEL0 = serINTERRUPT_ON_SINGLE_CHAR;
\r
139 U2STAbits.UTXISEL1 = serINTERRUPT_ON_SINGLE_CHAR;
\r
141 /* It is assumed that this function is called prior to the scheduler being
\r
142 started. Therefore interrupts must not be allowed to occur yet as they
\r
143 may attempt to perform a context switch. */
\r
144 portDISABLE_INTERRUPTS();
\r
146 IFS1bits.U2RXIF = serCLEAR_FLAG;
\r
147 IFS1bits.U2TXIF = serCLEAR_FLAG;
\r
148 IPC7bits.U2RXIP = configKERNEL_INTERRUPT_PRIORITY;
\r
149 IPC7bits.U2TXIP = configKERNEL_INTERRUPT_PRIORITY;
\r
150 IEC1bits.U2TXIE = serINTERRUPT_ENABLE;
\r
151 IEC1bits.U2RXIE = serINTERRUPT_ENABLE;
\r
153 /* Clear the Rx buffer. */
\r
154 while( U2STAbits.URXDA == serSET_FLAG )
\r
159 xTxHasEnded = pdTRUE;
\r
163 /*-----------------------------------------------------------*/
\r
165 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
\r
167 /* Only one port is supported. */
\r
170 /* Get the next character from the buffer. Return false if no characters
\r
171 are available or arrive before xBlockTime expires. */
\r
172 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
\r
181 /*-----------------------------------------------------------*/
\r
183 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
\r
185 /* Only one port is supported. */
\r
188 /* Return false if after the block time there is no room on the Tx queue. */
\r
189 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
\r
194 /* A critical section should not be required as xTxHasEnded will not be
\r
195 written to by the ISR if it is already 0 (is this correct?). */
\r
198 xTxHasEnded = pdFALSE;
\r
199 IFS1bits.U2TXIF = serSET_FLAG;
\r
204 /*-----------------------------------------------------------*/
\r
206 void vSerialClose( xComPortHandle xPort )
\r
209 /*-----------------------------------------------------------*/
\r
211 void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt( void )
\r
214 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
\r
216 /* Get the character and post it on the queue of Rxed characters.
\r
217 If the post causes a task to wake force a context switch as the woken task
\r
218 may have a higher priority than the task we have interrupted. */
\r
219 IFS1bits.U2RXIF = serCLEAR_FLAG;
\r
220 while( U2STAbits.URXDA )
\r
223 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
\r
226 if( xHigherPriorityTaskWoken != pdFALSE )
\r
231 /*-----------------------------------------------------------*/
\r
233 void __attribute__((__interrupt__, auto_psv)) _U2TXInterrupt( void )
\r
236 portBASE_TYPE xTaskWoken = pdFALSE;
\r
238 /* If the transmit buffer is full we cannot get the next character.
\r
239 Another interrupt will occur the next time there is space so this does
\r
241 IFS1bits.U2TXIF = serCLEAR_FLAG;
\r
242 while( !( U2STAbits.UTXBF ) )
\r
244 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWoken ) == pdTRUE )
\r
246 /* Send the next character queued for Tx. */
\r
251 /* Queue empty, nothing to send. */
\r
252 xTxHasEnded = pdTRUE;
\r
257 if( xTaskWoken != pdFALSE )
\r