2 FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.
\r
4 This file is part of the FreeRTOS.org distribution.
\r
6 FreeRTOS.org is free software; you can redistribute it and/or modify
\r
7 it under the terms of the GNU General Public License as published by
\r
8 the Free Software Foundation; either version 2 of the License, or
\r
9 (at your option) any later version.
\r
11 FreeRTOS.org is distributed in the hope that it will be useful,
\r
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 GNU General Public License for more details.
\r
16 You should have received a copy of the GNU General Public License
\r
17 along with FreeRTOS.org; if not, write to the Free Software
\r
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
20 A special exception to the GPL can be applied should you wish to distribute
\r
21 a combined work that includes FreeRTOS.org, without being obliged to provide
\r
22 the source code for any proprietary components. See the licensing section
\r
23 of http://www.FreeRTOS.org for full details of how and when the exception
\r
26 ***************************************************************************
\r
27 ***************************************************************************
\r
29 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
\r
31 * This is a concise, step by step, 'hands on' guide that describes both *
\r
32 * general multitasking concepts and FreeRTOS specifics. It presents and *
\r
33 * explains numerous examples that are written using the FreeRTOS API. *
\r
34 * Full source code for all the examples is provided in an accompanying *
\r
37 ***************************************************************************
\r
38 ***************************************************************************
\r
40 Please ensure to read the configuration and relevant port sections of the
\r
41 online documentation.
\r
43 http://www.FreeRTOS.org - Documentation, latest information, license and
\r
46 http://www.SafeRTOS.com - A version that is certified for use in safety
\r
49 http://www.OpenRTOS.com - Commercial support, development, porting,
\r
50 licensing and training services.
\r
54 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
\r
58 /*-----------------------------------------------------------
\r
59 * Components that can be compiled to either ARM or THUMB mode are
\r
60 * contained in this file.c The ISR routines, which can only be compiled
\r
61 * to ARM mode, are contained in serialISR.c.
\r
62 *----------------------------------------------------------*/
\r
66 /* Library includes. */
\r
67 #include "75x_uart.h"
\r
68 #include "75x_gpio.h"
\r
69 #include "75x_eic.h"
\r
70 #include "75x_mrcc.h"
\r
72 /* Scheduler includes. */
\r
73 #include "FreeRTOS.h"
\r
76 /* Demo application includes. */
\r
79 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
\r
80 #define serNO_BLOCK ( ( portTickType ) 0 )
\r
82 /*-----------------------------------------------------------*/
\r
84 /* Queues used to hold received characters, and characters waiting to be
\r
86 static xQueueHandle xRxedChars;
\r
87 static xQueueHandle xCharsForTx;
\r
89 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
\r
91 /*-----------------------------------------------------------*/
\r
93 /* The interrupt service routine - called from the assembly entry point. */
\r
94 void vSerialISR( void );
\r
95 void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, volatile portBASE_TYPE *pxEmptyFlag );
\r
97 /*-----------------------------------------------------------*/
\r
100 * See the serial2.h header file.
\r
102 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
\r
104 xComPortHandle xReturn;
\r
105 UART_InitTypeDef UART_InitStructure;
\r
106 GPIO_InitTypeDef GPIO_InitStructure;
\r
107 EIC_IRQInitTypeDef EIC_IRQInitStructure;
\r
109 /* Create the queues used to hold Rx and Tx characters. */
\r
110 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
\r
111 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
\r
113 /* If the queues were created correctly then setup the serial port
\r
115 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
\r
118 vConfigureQueues( xRxedChars, xCharsForTx, &xQueueEmpty );
\r
120 portENTER_CRITICAL();
\r
122 /* Enable the UART0 Clock. */
\r
123 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
\r
125 /* Configure the UART0_Tx as alternate function */
\r
126 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
\r
127 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
\r
128 GPIO_Init(GPIO0, &GPIO_InitStructure);
\r
130 /* Configure the UART0_Rx as input floating */
\r
131 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
\r
132 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
\r
133 GPIO_Init(GPIO0, &GPIO_InitStructure);
\r
135 /* Configure UART0. */
\r
136 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
\r
137 UART_InitStructure.UART_StopBits = UART_StopBits_1;
\r
138 UART_InitStructure.UART_Parity = UART_Parity_No;
\r
139 UART_InitStructure.UART_BaudRate = ulWantedBaud;
\r
140 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
\r
141 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
\r
142 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
\r
143 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
\r
144 UART_Init(UART0, &UART_InitStructure);
\r
146 /* Enable the UART0 */
\r
147 UART_Cmd(UART0, ENABLE);
\r
149 /* Configure the IEC for the UART interrupts. */
\r
150 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
\r
151 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
\r
152 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
\r
153 EIC_IRQInit(&EIC_IRQInitStructure);
\r
155 xQueueEmpty = pdTRUE;
\r
156 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
\r
158 portEXIT_CRITICAL();
\r
162 xReturn = ( xComPortHandle ) 0;
\r
165 /* This demo file only supports a single port but we have to return
\r
166 something to comply with the standard demo header file. */
\r
169 /*-----------------------------------------------------------*/
\r
171 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
\r
173 /* The port handle is not required as this driver only supports one port. */
\r
176 /* Get the next character from the buffer. Return false if no characters
\r
177 are available, or arrive before xBlockTime expires. */
\r
178 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
\r
187 /*-----------------------------------------------------------*/
\r
189 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
\r
191 signed portCHAR *pxNext;
\r
193 /* A couple of parameters that this port does not use. */
\r
194 ( void ) usStringLength;
\r
197 /* NOTE: This implementation does not handle the queue being full as no
\r
198 block time is used! */
\r
200 /* The port handle is not required as this driver only supports UART0. */
\r
203 /* Send each character in the string, one at a time. */
\r
204 pxNext = ( signed portCHAR * ) pcString;
\r
207 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
\r
211 /*-----------------------------------------------------------*/
\r
213 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
\r
215 portBASE_TYPE xReturn;
\r
217 /* Place the character in the queue of characters to be transmitted. */
\r
218 portENTER_CRITICAL();
\r
220 if( xQueueEmpty == pdTRUE )
\r
222 UART0->DR = cOutChar;
\r
227 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
\r
237 xQueueEmpty = pdFALSE;
\r
239 portEXIT_CRITICAL();
\r
243 /*-----------------------------------------------------------*/
\r
245 void vSerialClose( xComPortHandle xPort )
\r
247 /* Not supported as not required by the demo application. */
\r
249 /*-----------------------------------------------------------*/
\r