2 FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd.
\r
5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
\r
7 ***************************************************************************
\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
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
19 ***************************************************************************
\r
21 This file is part of the FreeRTOS distribution.
\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
27 >>! NOTE: The modification to the GPL is included to allow you to !<<
\r
28 >>! distribute a combined work that includes FreeRTOS without being !<<
\r
29 >>! obliged to provide the source code for proprietary components !<<
\r
30 >>! outside of the FreeRTOS kernel. !<<
\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
39 ***************************************************************************
\r
41 * Having a problem? Start by reading the FAQ "My application does *
\r
42 * not run, what could be wrong?" *
\r
44 * http://www.FreeRTOS.org/FAQHelp.html *
\r
46 ***************************************************************************
\r
48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
\r
49 license and Real Time Engineers Ltd. contact details.
\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
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
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
67 INTERRUPT DRIVEN SERIAL PORT DRIVER.
\r
71 /******************************************************************************
\r
72 *** NOTE: COM0 == USART1, COM1 == USART2
\r
73 ******************************************************************************/
\r
76 /* Scheduler includes. */
\r
77 #include "FreeRTOS.h"
\r
82 /* Library includes. */
\r
83 #include "stm32f10x_lib.h"
\r
85 /* Driver includes. */
\r
86 #include "STM32_USART.h"
\r
87 /*-----------------------------------------------------------*/
\r
89 /* The number of COM ports that can be controlled at the same time. */
\r
90 #define serNUM_COM_PORTS ( 2 )
\r
92 /* Queues are used to hold characters that are waiting to be transmitted. This
\r
93 constant sets the maximum number of characters that can be contained in such a
\r
94 queue at any one time. */
\r
95 #define serTX_QUEUE_LEN ( 100 )
\r
97 /* Queues are used to hold characters that have been received but not yet
\r
98 processed. This constant sets the maximum number of characters that can be
\r
99 contained in such a queue. */
\r
100 #define serRX_QUEUE_LEN ( 100 )
\r
102 /* The maximum amount of time that calls to lSerialPutString() should wait for
\r
103 there to be space to post each character to the queue of characters waiting
\r
104 transmission. NOTE! This is the time to wait per character - not the time to
\r
105 wait for the entire string. */
\r
106 #define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_PERIOD_MS )
\r
108 /*-----------------------------------------------------------*/
\r
110 /* References to the USART peripheral addresses themselves. */
\r
111 static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
\r
113 /* Queues used to hold characters waiting to be transmitted - one queue per port. */
\r
114 static QueueHandle_t xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
\r
116 /* Queues holding received characters - one queue per port. */
\r
117 static QueueHandle_t xRxedChars[ serNUM_COM_PORTS ] = { 0 };
\r
119 /*-----------------------------------------------------------*/
\r
121 /* UART interrupt handlers, as named in the vector table. */
\r
122 void USART1_IRQHandler( void );
\r
123 void USART2_IRQHandler( void );
\r
125 /*-----------------------------------------------------------*/
\r
128 * See header file for parameter descriptions.
\r
130 long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
\r
132 long lReturn = pdFAIL;
\r
133 USART_InitTypeDef USART_InitStructure;
\r
134 NVIC_InitTypeDef NVIC_InitStructure;
\r
135 GPIO_InitTypeDef GPIO_InitStructure;
\r
137 if( ulPort < serNUM_COM_PORTS )
\r
139 /* The common (not port dependent) part of the initialisation. */
\r
140 USART_InitStructure.USART_BaudRate = ulWantedBaud;
\r
141 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
\r
142 USART_InitStructure.USART_StopBits = USART_StopBits_1;
\r
143 USART_InitStructure.USART_Parity = USART_Parity_No;
\r
144 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
\r
145 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
\r
146 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
\r
147 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
\r
148 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
\r
151 /* Init the buffer structures with the buffer for the COM port being
\r
152 initialised, and perform any non-common initialisation necessary. This
\r
153 does not check to see if the COM port has already been initialised. */
\r
156 /* Create the queue of chars that are waiting to be sent to COM0. */
\r
157 xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
\r
159 /* Create the queue used to hold characters received from COM0. */
\r
160 xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
\r
162 /* Enable COM0 clock - the ST libraries start numbering from UART1. */
\r
163 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
\r
165 /* Configure USART1 Rx (PA10) as input floating */
\r
166 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
\r
167 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
168 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
170 /* Configure USART1 Tx (PA9) as alternate function push-pull */
\r
171 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
\r
172 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
\r
173 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
174 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
176 USART_Init( USART1, &USART_InitStructure );
\r
177 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
\r
179 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
\r
180 NVIC_Init( &NVIC_InitStructure );
\r
182 USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
\r
183 USART_Cmd( USART1, ENABLE );
\r
185 /* Everything is ok. */
\r
188 else if( ulPort == 1 )
\r
190 /* Create the queue of chars that are waiting to be sent to COM1. */
\r
191 xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
\r
193 /* Create the queue used to hold characters received from COM0. */
\r
194 xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
\r
196 /* Enable COM0 clock - the ST libraries start numbering from 1. */
\r
197 RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
\r
199 /* Configure USART2 Rx (PA3) as input floating */
\r
200 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
\r
201 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
202 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
204 /* Configure USART2 Tx (PA2) as alternate function push-pull */
\r
205 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
\r
206 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
\r
207 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
208 GPIO_Init( GPIOA, &GPIO_InitStructure );
\r
210 USART_Init( USART2, &USART_InitStructure );
\r
211 USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
\r
213 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
\r
214 NVIC_Init( &NVIC_InitStructure );
\r
216 USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
\r
217 USART_Cmd( USART2, ENABLE );
\r
219 /* Everything is ok. */
\r
224 /* Nothing to do unless more than two ports are supported. */
\r
230 /*-----------------------------------------------------------*/
\r
232 signed long xSerialGetChar( long lPort, signed char *pcRxedChar, TickType_t xBlockTime )
\r
234 long lReturn = pdFAIL;
\r
236 if( lPort < serNUM_COM_PORTS )
\r
238 if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
\r
246 /*-----------------------------------------------------------*/
\r
248 long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
\r
253 if( lPort < serNUM_COM_PORTS )
\r
257 for( ul = 0; ul < ulStringLength; ul++ )
\r
259 if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
\r
261 /* Cannot fit any more in the queue. Try turning the Tx on to
\r
262 clear some space. */
\r
263 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
264 vTaskDelay( serPUT_STRING_CHAR_DELAY );
\r
266 /* Go back and try again. */
\r
271 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
280 /*-----------------------------------------------------------*/
\r
282 signed long xSerialPutChar( long lPort, signed char cOutChar, TickType_t xBlockTime )
\r
286 if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
\r
289 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
\r
298 /*-----------------------------------------------------------*/
\r
300 void USART1_IRQHandler( void )
\r
302 long xHigherPriorityTaskWoken = pdFALSE;
\r
305 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
\r
307 /* The interrupt was caused by the THR becoming empty. Are there any
\r
308 more characters to transmit? */
\r
309 if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
\r
311 /* A character was retrieved from the buffer so can be sent to the
\r
313 USART_SendData( USART1, cChar );
\r
317 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
\r
321 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
\r
323 cChar = USART_ReceiveData( USART1 );
\r
324 xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
\r
327 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
\r
329 /*-----------------------------------------------------------*/
\r
331 void USART2_IRQHandler( void )
\r