2 FreeRTOS.org V4.7.2 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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28 Please ensure to read the configuration and relevant port sections of the
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29 online documentation.
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31 +++ http://www.FreeRTOS.org +++
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32 Documentation, latest information, license and contact details.
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34 +++ http://www.SafeRTOS.com +++
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35 A version that is certified for use in safety critical systems.
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37 +++ http://www.OpenRTOS.com +++
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38 Commercial support, development, porting, licensing and training services.
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40 ***************************************************************************
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45 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART
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48 /* Scheduler includes. */
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49 #include "FreeRTOS.h"
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53 /* Demo application includes. */
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56 /* Microblaze driver includes. */
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57 #include "xparameters.h"
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58 #include "xuartlite.h"
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59 #include "xuartlite_l.h"
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60 #include "xintc_l.h"
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63 /*-----------------------------------------------------------*/
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65 /* Queues used to hold received characters, and characters waiting to be
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67 static xQueueHandle xRxedChars;
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68 static xQueueHandle xCharsForTx;
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70 static XUartLite xUART;
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72 static void vSerialISR( XUartLite *pxUART );
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74 /*-----------------------------------------------------------*/
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76 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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78 unsigned portLONG ulControlReg, ulMask;
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79 extern XIntc xInterruptController;
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81 /* NOTE: The baud rate used by this driver is determined by the hardware
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82 parameterization of the UART Lite peripheral, and the baud value passed to
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83 this function has no effect. */
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85 /* Create the queues used to hold Rx and Tx characters. */
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86 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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87 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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89 if( ( xRxedChars ) && ( xCharsForTx ) )
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92 XUartLite_Initialize( &xUART, XPAR_RS232_UART_DEVICE_ID );
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93 XUartLite_ResetFifos( &xUART );
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94 XUartLite_DisableInterrupt( &xUART );
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96 if( xPortInstallInterruptHandler( XPAR_OPB_INTC_0_RS232_UART_INTERRUPT_INTR, ( XInterruptHandler )vSerialISR, (void *)&xUART ) == pdPASS )
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98 XUartLite_EnableInterrupt( &xUART );
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102 return ( xComPortHandle ) 0;
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104 /*-----------------------------------------------------------*/
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106 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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108 /* The port handle is not required as this driver only supports one UART. */
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111 /* Get the next character from the buffer. Return false if no characters
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112 are available, or arrive before xBlockTime expires. */
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113 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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122 /*-----------------------------------------------------------*/
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124 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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126 portBASE_TYPE xReturn = pdTRUE;
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128 portENTER_CRITICAL();
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130 /* If the UART FIFO is full we can block posting the new data on the
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132 if( XUartLite_mIsTransmitFull( XPAR_RS232_UART_BASEADDR ) )
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134 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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139 /* Otherwise, if there is data already in the queue we should add the
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140 new data to the back of the queue to ensure the sequencing is
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142 else if( uxQueueMessagesWaiting( xCharsForTx ) )
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144 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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149 /* If the UART FIFO is not full and there is no data already in the
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150 queue we can write directly to the FIFO without disrupting the
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154 XIo_Out32( XPAR_RS232_UART_BASEADDR + XUL_TX_FIFO_OFFSET, cOutChar );
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157 portEXIT_CRITICAL();
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161 /*-----------------------------------------------------------*/
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163 void vSerialClose( xComPortHandle xPort )
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165 /* Not supported as not required by the demo application. */
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168 /*-----------------------------------------------------------*/
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170 static void vSerialISR( XUartLite *pxUART )
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172 unsigned portLONG ulISRStatus;
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173 portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
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176 ulISRStatus = XIo_In32( pxUART->RegBaseAddress + XUL_STATUS_REG_OFFSET );
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178 if( ( ulISRStatus & (XUL_SR_RX_FIFO_FULL | XUL_SR_RX_FIFO_VALID_DATA ) ) != 0 )
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180 /* A character is available - place it in the queue of received
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181 characters. This might wake a task that was blocked waiting for
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183 cChar = ( portCHAR ) XIo_In32( pxUART->RegBaseAddress + XUL_RX_FIFO_OFFSET );
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184 xTaskWokenByRx = xQueueSendFromISR( xRxedChars, &cChar, xTaskWokenByRx );
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187 if( ( ulISRStatus & XUL_SR_TX_FIFO_EMPTY ) != 0 )
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189 /* There is space in the FIFO - if there are any characters queue for
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190 transmission they can be send to the UART now. This might unblock a
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191 task that was waiting for space to become available on the Tx queue. */
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192 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWokenByTx ) == pdTRUE )
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194 XIo_Out32( pxUART->RegBaseAddress + XUL_TX_FIFO_OFFSET, cChar );
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199 /* If we woke any tasks we may require a context switch. */
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200 if( xTaskWokenByTx || xTaskWokenByRx )
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202 portYIELD_FROM_ISR();
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