2 FreeRTOS V7.3.0 - Copyright (C) 2012 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
32 >>>NOTE<<< The modification to the GPL is included to allow you to
\r
33 distribute a combined work that includes FreeRTOS without being obliged to
\r
34 provide the source code for proprietary components outside of the FreeRTOS
\r
35 kernel. FreeRTOS is distributed in the hope that it will be useful, but
\r
36 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
\r
37 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
\r
38 more details. You should have received a copy of the GNU General Public
\r
39 License and the FreeRTOS license exception along with FreeRTOS; if not it
\r
40 can be viewed here: http://www.freertos.org/a00114.html and also obtained
\r
41 by writing to Richard Barry, contact details for whom are available on the
\r
46 ***************************************************************************
\r
48 * Having a problem? Start by reading the FAQ "My application does *
\r
49 * not run, what could be wrong?" *
\r
51 * http://www.FreeRTOS.org/FAQHelp.html *
\r
53 ***************************************************************************
\r
56 http://www.FreeRTOS.org - Documentation, training, latest versions, license
\r
57 and contact details.
\r
59 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
\r
60 including FreeRTOS+Trace - an indispensable productivity tool.
\r
62 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
\r
63 the code with commercial support, indemnification, and middleware, under
\r
64 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
\r
65 provide a safety engineered and independently SIL3 certified version under
\r
66 the SafeRTOS brand: http://www.SafeRTOS.com.
\r
70 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
\r
74 /*-----------------------------------------------------------
\r
75 * Components that can be compiled to either ARM or THUMB mode are
\r
76 * contained in this file.c The ISR routines, which can only be compiled
\r
77 * to ARM mode, are contained in serialISR.c.
\r
78 *----------------------------------------------------------*/
\r
82 /* Library includes. */
\r
83 #include "75x_uart.h"
\r
84 #include "75x_gpio.h"
\r
85 #include "75x_eic.h"
\r
86 #include "75x_mrcc.h"
\r
88 /* Scheduler includes. */
\r
89 #include "FreeRTOS.h"
\r
92 /* Demo application includes. */
\r
95 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
\r
96 #define serNO_BLOCK ( ( portTickType ) 0 )
\r
98 /*-----------------------------------------------------------*/
\r
100 /* Queues used to hold received characters, and characters waiting to be
\r
102 static xQueueHandle xRxedChars;
\r
103 static xQueueHandle xCharsForTx;
\r
105 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
\r
107 /*-----------------------------------------------------------*/
\r
109 /* The interrupt service routine - called from the assembly entry point. */
\r
110 void vSerialISR( void );
\r
111 void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, volatile portBASE_TYPE *pxEmptyFlag );
\r
113 /*-----------------------------------------------------------*/
\r
116 * See the serial2.h header file.
\r
118 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
\r
120 xComPortHandle xReturn;
\r
121 UART_InitTypeDef UART_InitStructure;
\r
122 GPIO_InitTypeDef GPIO_InitStructure;
\r
123 EIC_IRQInitTypeDef EIC_IRQInitStructure;
\r
125 /* Create the queues used to hold Rx and Tx characters. */
\r
126 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
127 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
\r
129 /* If the queues were created correctly then setup the serial port
\r
131 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
\r
134 vConfigureQueues( xRxedChars, xCharsForTx, &xQueueEmpty );
\r
136 portENTER_CRITICAL();
\r
138 /* Enable the UART0 Clock. */
\r
139 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
\r
141 /* Configure the UART0_Tx as alternate function */
\r
142 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
143 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
\r
144 GPIO_Init(GPIO0, &GPIO_InitStructure);
\r
146 /* Configure the UART0_Rx as input floating */
\r
147 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
148 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
\r
149 GPIO_Init(GPIO0, &GPIO_InitStructure);
\r
151 /* Configure UART0. */
\r
152 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
\r
153 UART_InitStructure.UART_StopBits = UART_StopBits_1;
\r
154 UART_InitStructure.UART_Parity = UART_Parity_No;
\r
155 UART_InitStructure.UART_BaudRate = ulWantedBaud;
\r
156 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
\r
157 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
\r
158 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
\r
159 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
\r
160 UART_Init(UART0, &UART_InitStructure);
\r
162 /* Enable the UART0 */
\r
163 UART_Cmd(UART0, ENABLE);
\r
165 /* Configure the IEC for the UART interrupts. */
\r
166 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
\r
167 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
\r
168 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
\r
169 EIC_IRQInit(&EIC_IRQInitStructure);
\r
171 xQueueEmpty = pdTRUE;
\r
172 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
\r
174 portEXIT_CRITICAL();
\r
178 xReturn = ( xComPortHandle ) 0;
\r
181 /* This demo file only supports a single port but we have to return
\r
182 something to comply with the standard demo header file. */
\r
185 /*-----------------------------------------------------------*/
\r
187 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
\r
189 /* The port handle is not required as this driver only supports one port. */
\r
192 /* Get the next character from the buffer. Return false if no characters
\r
193 are available, or arrive before xBlockTime expires. */
\r
194 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
\r
203 /*-----------------------------------------------------------*/
\r
205 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
\r
207 signed char *pxNext;
\r
209 /* A couple of parameters that this port does not use. */
\r
210 ( void ) usStringLength;
\r
213 /* NOTE: This implementation does not handle the queue being full as no
\r
214 block time is used! */
\r
216 /* The port handle is not required as this driver only supports UART0. */
\r
219 /* Send each character in the string, one at a time. */
\r
220 pxNext = ( signed char * ) pcString;
\r
223 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
\r
227 /*-----------------------------------------------------------*/
\r
229 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
\r
231 portBASE_TYPE xReturn;
\r
233 /* Place the character in the queue of characters to be transmitted. */
\r
234 portENTER_CRITICAL();
\r
236 if( xQueueEmpty == pdTRUE )
\r
238 UART0->DR = cOutChar;
\r
243 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
\r
253 xQueueEmpty = pdFALSE;
\r
255 portEXIT_CRITICAL();
\r
259 /*-----------------------------------------------------------*/
\r
261 void vSerialClose( xComPortHandle xPort )
\r
263 /* Not supported as not required by the demo application. */
\r
265 /*-----------------------------------------------------------*/
\r