/* FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd. *************************************************************************** * * * FreeRTOS tutorial books are available in pdf and paperback. * * Complete, revised, and edited pdf reference manuals are also * * available. * * * * Purchasing FreeRTOS documentation will not only help you, by * * ensuring you get running as quickly as possible and with an * * in-depth knowledge of how to use FreeRTOS, it will also help * * the FreeRTOS project to continue with its mission of providing * * professional grade, cross platform, de facto standard solutions * * for microcontrollers - completely free of charge! * * * * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * * * * Thank you for using FreeRTOS, and thank you for your support! * * * *************************************************************************** This file is part of the FreeRTOS distribution. FreeRTOS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation AND MODIFIED BY the FreeRTOS exception. >>>NOTE<<< The modification to the GPL is included to allow you to distribute a combined work that includes FreeRTOS without being obliged to provide the source code for proprietary components outside of the FreeRTOS kernel. FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License and the FreeRTOS license exception along with FreeRTOS; if not it can be viewed here: http://www.freertos.org/a00114.html and also obtained by writing to Richard Barry, contact details for whom are available on the FreeRTOS WEB site. 1 tab == 4 spaces! http://www.FreeRTOS.org - Documentation, latest information, license and contact details. http://www.SafeRTOS.com - A version that is certified for use in safety critical systems. http://www.OpenRTOS.com - Commercial support, development, porting, licensing and training services. */ /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. ***Note*** This example uses queues to send each character into an interrupt service routine and out of an interrupt service routine individually. This is done to demonstrate queues being used in an interrupt, and to deliberately load the system to test the FreeRTOS port. It is *NOT* meant to be an example of an efficient implementation. An efficient implementation should use FIFOs or DMA if available, and only use FreeRTOS API functions when enough has been received to warrant a task being unblocked to process the data. */ /* Scheduler includes. */ #include "FreeRTOS.h" #include "queue.h" #include "task.h" /*_RB_ remove this when the file is working. */ #include "comtest_strings.h" /* Library includes. */ #include "xuartlite.h" #include "xuartlite_l.h" /* Demo application includes. */ #include "serial.h" /*-----------------------------------------------------------*/ static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ); static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ); static XUartLite xUartLiteInstance; /* The queue used to hold received characters. */ static xQueueHandle xRxedChars; /*-----------------------------------------------------------*/ xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) { portBASE_TYPE xStatus; /* Create the queue used to hold Rx characters. */ xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); /* If the queue was created correctly then setup the serial port hardware. */ if( xRxedChars != NULL ) { xStatus = XUartLite_Initialize( &xUartLiteInstance, XPAR_UARTLITE_1_DEVICE_ID ); if( xStatus == XST_SUCCESS ) { /* Complete initialisation of the UART and its associated interrupts. */ XUartLite_ResetFifos( &xUartLiteInstance ); XUartLite_SetRecvHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvRxHandler, NULL ); XUartLite_SetSendHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvTxHandler, NULL ); xStatus = xPortInstallInterruptHandler( XPAR_INTC_0_UARTLITE_1_VEC_ID, ( XInterruptHandler ) XUartLite_InterruptHandler, &xUartLiteInstance ); XUartLite_EnableIntr( xUartLiteInstance.RegBaseAddress ); vPortEnableInterrupt( XPAR_INTC_0_UARTLITE_1_VEC_ID ); } configASSERT( xStatus == pdPASS ); } /* This demo file only supports a single port but something must be returned to comply with the standard demo header file. */ return ( xComPortHandle ) 0; } /*-----------------------------------------------------------*/ portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime ) { /* The port handle is not required as this driver only supports one port. */ ( void ) pxPort; /* Get the next character from the buffer. Return false if no characters are available, or arrive before xBlockTime expires. */ if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) ) { return pdTRUE; } else { return pdFALSE; } } /*-----------------------------------------------------------*/ void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned portBASE_TYPE uxStringLength ) { XUartLite_Send( &xUartLiteInstance, ( unsigned char * ) pcString, uxStringLength ); } /*-----------------------------------------------------------*/ signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime ) { /* Only vSerialPutString() is used in this demo. */ ( void ) pxPort; ( void ) cOutChar; ( void ) xBlockTime; return pdFALSE; } /*-----------------------------------------------------------*/ void vSerialClose( xComPortHandle xPort ) { /* Not supported as not required by the demo application. */ } /*-----------------------------------------------------------*/ static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ) { signed char cRxedChar; portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; while( XUartLite_IsReceiveEmpty( xUartLiteInstance.RegBaseAddress ) == pdFALSE ) { cRxedChar = XUartLite_ReadReg( xUartLiteInstance.RegBaseAddress, XUL_RX_FIFO_OFFSET); xQueueSendFromISR( xRxedChars, &cRxedChar, &xHigherPriorityTaskWoken ); } portYIELD_FROM_ISR( xHigherPriorityTaskWoken ); } /*-----------------------------------------------------------*/ static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount ) { portNOP(); }