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 INTERRUPT DRIVEN SERIAL PORT DRIVER.
\r
74 /******************************************************************************
\r
75 *** NOTE: COM0 == USART1, COM1 == USART2
\r
76 ******************************************************************************/
\r
79 /* Scheduler includes. */
\r
80 #include "FreeRTOS.h"
\r
85 /* Library includes. */
\r
86 #include "stm32f10x_lib.h"
\r
88 /* Driver includes. */
\r
89 #include "STM32_USART.h"
\r
90 /*-----------------------------------------------------------*/
\r
92 /* The number of COM ports that can be controlled at the same time. */
\r
93 #define serNUM_COM_PORTS ( 2 )
\r
95 /* Queues are used to hold characters that are waiting to be transmitted. This
\r
96 constant sets the maximum number of characters that can be contained in such a
\r
97 queue at any one time. */
\r
98 #define serTX_QUEUE_LEN ( 100 )
\r
100 /* Queues are used to hold characters that have been received but not yet
\r
101 processed. This constant sets the maximum number of characters that can be
\r
102 contained in such a queue. */
\r
103 #define serRX_QUEUE_LEN ( 100 )
\r
105 /* The maximum amount of time that calls to lSerialPutString() should wait for
\r
106 there to be space to post each character to the queue of characters waiting
\r
107 transmission. NOTE! This is the time to wait per character - not the time to
\r
108 wait for the entire string. */
\r
109 #define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_RATE_MS )
\r
111 /*-----------------------------------------------------------*/
\r
113 /* References to the USART peripheral addresses themselves. */
\r
114 static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
\r
116 /* Queues used to hold characters waiting to be transmitted - one queue per port. */
\r
117 static xQueueHandle xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
\r
119 /* Queues holding received characters - one queue per port. */
\r
120 static xQueueHandle xRxedChars[ serNUM_COM_PORTS ] = { 0 };
\r
122 /*-----------------------------------------------------------*/
\r
124 /* UART interrupt handlers, as named in the vector table. */
\r
125 void USART1_IRQHandler( void );
\r
126 void USART2_IRQHandler( void );
\r
128 /*-----------------------------------------------------------*/
\r
131 * See header file for parameter descriptions.
\r
133 long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
\r
135 long lReturn = pdFAIL;
\r
136 USART_InitTypeDef USART_InitStructure;
\r
137 NVIC_InitTypeDef NVIC_InitStructure;
\r
138 GPIO_InitTypeDef GPIO_InitStructure;
\r
140 if( ulPort < serNUM_COM_PORTS )
\r
142 /* The common (not port dependent) part of the initialisation. */
\r
143 USART_InitStructure.USART_BaudRate = ulWantedBaud;
\r
144 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
\r
145 USART_InitStructure.USART_StopBits = USART_StopBits_1;
\r
146 USART_InitStructure.USART_Parity = USART_Parity_No;
\r
147 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
\r
148 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
\r
149 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
\r
150 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
\r
151 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
\r
154 /* Init the buffer structures with the buffer for the COM port being
\r
155 initialised, and perform any non-common initialisation necessary. This
\r
156 does not check to see if the COM port has already been initialised. */
\r
159 /* Create the queue of chars that are waiting to be sent to COM0. */
\r
160 xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
\r
162 /* Create the queue used to hold characters received from COM0. */
\r
163 xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
\r
165 /* Enable COM0 clock - the ST libraries start numbering from UART1. */
\r
166 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
\r
168 /* Configure USART1 Rx (PA10) as input floating */
\r
169 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
\r
170 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
171 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
173 /* Configure USART1 Tx (PA9) as alternate function push-pull */
\r
174 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
\r
175 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
\r
176 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
177 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
179 USART_Init( USART1, &USART_InitStructure );
\r
180 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
\r
182 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
\r
183 NVIC_Init( &NVIC_InitStructure );
\r
185 USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
\r
186 USART_Cmd( USART1, ENABLE );
\r
188 /* Everything is ok. */
\r
191 else if( ulPort == 1 )
\r
193 /* Create the queue of chars that are waiting to be sent to COM1. */
\r
194 xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
\r
196 /* Create the queue used to hold characters received from COM0. */
\r
197 xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
\r
199 /* Enable COM0 clock - the ST libraries start numbering from 1. */
\r
200 RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
\r
202 /* Configure USART2 Rx (PA3) as input floating */
\r
203 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
\r
204 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
205 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
207 /* Configure USART2 Tx (PA2) as alternate function push-pull */
\r
208 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
\r
209 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
\r
210 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
211 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
213 USART_Init( USART2, &USART_InitStructure );
\r
214 USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
\r
216 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
\r
217 NVIC_Init( &NVIC_InitStructure );
\r
219 USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
\r
220 USART_Cmd( USART2, ENABLE );
\r
222 /* Everything is ok. */
\r
227 /* Nothing to do unless more than two ports are supported. */
\r
233 /*-----------------------------------------------------------*/
\r
235 signed long xSerialGetChar( long lPort, signed char *pcRxedChar, portTickType xBlockTime )
\r
237 long lReturn = pdFAIL;
\r
239 if( lPort < serNUM_COM_PORTS )
\r
241 if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
\r
249 /*-----------------------------------------------------------*/
\r
251 long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
\r
256 if( lPort < serNUM_COM_PORTS )
\r
260 for( ul = 0; ul < ulStringLength; ul++ )
\r
262 if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
\r
264 /* Cannot fit any more in the queue. Try turning the Tx on to
\r
265 clear some space. */
\r
266 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
267 vTaskDelay( serPUT_STRING_CHAR_DELAY );
\r
269 /* Go back and try again. */
\r
274 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
283 /*-----------------------------------------------------------*/
\r
285 signed long xSerialPutChar( long lPort, signed char cOutChar, portTickType xBlockTime )
\r
289 if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
\r
292 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
301 /*-----------------------------------------------------------*/
\r
303 void USART1_IRQHandler( void )
\r
305 long xHigherPriorityTaskWoken = pdFALSE;
\r
308 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
\r
310 /* The interrupt was caused by the THR becoming empty. Are there any
\r
311 more characters to transmit? */
\r
312 if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
\r
314 /* A character was retrieved from the buffer so can be sent to the
\r
316 USART_SendData( USART1, cChar );
\r
320 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
\r
324 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
\r
326 cChar = USART_ReceiveData( USART1 );
\r
327 xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
\r
330 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
\r
332 /*-----------------------------------------------------------*/
\r
334 void USART2_IRQHandler( void )
\r