Uart Driver Free Rtos Demo
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This repository has been archived by the owner. It is now read-only.
- The RTOS UART handle, the pointer to allocated space for RTOS context. T_handle The pointer to allocated space where to store transactional layer internal state.
- FreeRTOS BSPs: 3 rd party driver packages Trace & Visualisation: Tracealyzer for FreeRTOS. The Softune workspace for the MB91460 demo is called 91467d_FreeRTOS.wsp and can be located in the Demo/MB91460. The demo application includes an interrupt driven UART test where one task transmits characters that are then received by another task.
My UART driver for FreeRTOS uses this technique (LPC 2xxx ARM7) Use FIFO in UART. The interrupt rate is reduced from one per char to on per 10 chars (or whatever you wish, 16 byte FIFO). At each interrupt, copy all bytes in the FIFO to buffer or queue, then dismiss the interrupt.
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Uart Driver Free Rtos Demon
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richardbarryChange version numbers to V7.1.0.f3980c3Dec 13, 2011
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| /* |
| FreeRTOS V7.1.0 - 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. |
| */ |
| /* |
| Changes from V2.4.0 |
| + Made serial ISR handling more complete and robust. |
| Changes from V2.4.1 |
| + Split serial.c into serial.c and serialISR.c. serial.c can be |
| compiled using ARM or THUMB modes. serialISR.c must always be |
| compiled in ARM mode. |
| + Another small change to cSerialPutChar(). |
| Changed from V2.5.1 |
| + In cSerialPutChar() an extra check is made to ensure the post to |
| the queue was successful if then attempting to retrieve the posted |
| character. |
| */ |
| /* |
| BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. |
| This file contains all the serial port components that can be compiled to |
| either ARM or THUMB mode. Components that must be compiled to ARM mode are |
| contained in serialISR.c. |
| */ |
| /* Standard includes. */ |
| #include<stdlib.h> |
| /* Scheduler includes. */ |
| #include'FreeRTOS.h' |
| #include'queue.h' |
| #include'task.h' |
| /* Demo application includes. */ |
| #include'serial.h' |
| /*-----------------------------------------------------------*/ |
| /* Constants to setup and access the UART. */ |
| #defineserDLAB ( ( unsignedchar ) 0x80 ) |
| #defineserENABLE_INTERRUPTS ( ( unsignedchar ) 0x03 ) |
| #defineserNO_PARITY ( ( unsignedchar ) 0x00 ) |
| #defineser1_STOP_BIT ( ( unsignedchar ) 0x00 ) |
| #defineser8_BIT_CHARS ( ( unsignedchar ) 0x03 ) |
| #defineserFIFO_ON ( ( unsignedchar ) 0x01 ) |
| #defineserCLEAR_FIFO ( ( unsignedchar ) 0x06 ) |
| #defineserWANTED_CLOCK_SCALING ( ( unsignedlong ) 16 ) |
| /* Constants to setup and access the VIC. */ |
| #defineserUART0_VIC_CHANNEL ( ( unsignedlong ) 0x0006 ) |
| #defineserUART0_VIC_CHANNEL_BIT ( ( unsignedlong ) 0x0040 ) |
| #defineserUART0_VIC_ENABLE ( ( unsignedlong ) 0x0020 ) |
| #defineserCLEAR_VIC_INTERRUPT ( ( unsignedlong ) 0 ) |
| #defineserINVALID_QUEUE ( ( xQueueHandle ) 0 ) |
| #defineserHANDLE ( ( xComPortHandle ) 1 ) |
| #defineserNO_BLOCK ( ( portTickType ) 0 ) |
| /*-----------------------------------------------------------*/ |
| /* Queues used to hold received characters, and characters waiting to be |
| transmitted. */ |
| static xQueueHandle xRxedChars; |
| static xQueueHandle xCharsForTx; |
| /*-----------------------------------------------------------*/ |
| /* Communication flag between the interrupt service routine and serial API. */ |
| staticvolatilelong *plTHREEmpty; |
| /* |
| * The queues are created in serialISR.c as they are used from the ISR. |
| * Obtain references to the queues and THRE Empty flag. |
| */ |
| externvoidvSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx, longvolatile **pplTHREEmptyFlag ); |
| /*-----------------------------------------------------------*/ |
| xComPortHandle xSerialPortInitMinimal( unsignedlong ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) |
| { |
| unsignedlong ulDivisor, ulWantedClock; |
| xComPortHandle xReturn = serHANDLE; |
| externvoid ( vUART_ISR_Wrapper )( void ); |
| /* The queues are used in the serial ISR routine, so are created from |
| serialISR.c (which is always compiled to ARM mode. */ |
| vSerialISRCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx, &plTHREEmpty ); |
| if( |
| ( xRxedChars != serINVALID_QUEUE ) && |
| ( xCharsForTx != serINVALID_QUEUE ) && |
| ( ulWantedBaud != ( unsignedlong ) 0 ) |
| ) |
| { |
| portENTER_CRITICAL(); |
| { |
| /* Setup the baud rate: Calculate the divisor value. */ |
| ulWantedClock = ulWantedBaud * serWANTED_CLOCK_SCALING; |
| ulDivisor = configCPU_CLOCK_HZ / ulWantedClock; |
| /* Set the DLAB bit so we can access the divisor. */ |
| UART0_LCR = serDLAB; |
| /* Setup the divisor. */ |
| UART0_DLL = ( unsignedchar ) ( ulDivisor & ( unsignedlong ) 0xff ); |
| ulDivisor >>= 8; |
| UART0_DLM = ( unsignedchar ) ( ulDivisor & ( unsignedlong ) 0xff ); |
| /* Turn on the FIFO's and clear the buffers. */ |
| UART0_FCR = ( serFIFO_ON serCLEAR_FIFO ); |
| /* Setup transmission format. */ |
| UART0_LCR = serNO_PARITY ser1_STOP_BIT ser8_BIT_CHARS; |
| /* Setup the VIC for the UART. */ |
| VICIntSelect &= ~( serUART0_VIC_CHANNEL_BIT ); |
| VICIntEnable = serUART0_VIC_CHANNEL_BIT; |
| VICVectAddr1 = ( long ) vUART_ISR_Wrapper; |
| VICVectCntl1 = serUART0_VIC_CHANNEL serUART0_VIC_ENABLE; |
| /* Enable UART0 interrupts. */ |
| UART0_IER = serENABLE_INTERRUPTS; |
| } |
| portEXIT_CRITICAL(); |
| } |
| else |
| { |
| xReturn = ( xComPortHandle ) 0; |
| } |
| return xReturn; |
| } |
| /*-----------------------------------------------------------*/ |
| signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signedchar *pcRxedChar, portTickType xBlockTime ) |
| { |
| /* The port handle is not required as this driver only supports UART0. */ |
| ( 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; |
| } |
| } |
| /*-----------------------------------------------------------*/ |
| voidvSerialPutString( xComPortHandle pxPort, constsignedchar * const pcString, unsignedshort usStringLength ) |
| { |
| signedchar *pxNext; |
| /* NOTE: This implementation does not handle the queue being full as no |
| block time is used! */ |
| /* The port handle is not required as this driver only supports UART0. */ |
| ( void ) pxPort; |
| ( void ) usStringLength; |
| /* Send each character in the string, one at a time. */ |
| pxNext = ( signedchar * ) pcString; |
| while( *pxNext ) |
| { |
| xSerialPutChar( pxPort, *pxNext, serNO_BLOCK ); |
| pxNext++; |
| } |
| } |
| /*-----------------------------------------------------------*/ |
| signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signedchar cOutChar, portTickType xBlockTime ) |
| { |
| signed portBASE_TYPE xReturn; |
| /* This demo driver only supports one port so the parameter is not used. */ |
| ( void ) pxPort; |
| portENTER_CRITICAL(); |
| { |
| /* Is there space to write directly to the UART? */ |
| if( *plTHREEmpty ( long ) pdTRUE ) |
| { |
| /* We wrote the character directly to the UART, so was |
| successful. */ |
| *plTHREEmpty = pdFALSE; |
| UART0_THR = cOutChar; |
| xReturn = pdPASS; |
| } |
| else |
| { |
| /* We cannot write directly to the UART, so queue the character. |
| Block for a maximum of xBlockTime if there is no space in the |
| queue. */ |
| xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime ); |
| /* Depending on queue sizing and task prioritisation: While we |
| were blocked waiting to post interrupts were not disabled. It is |
| possible that the serial ISR has emptied the Tx queue, in which |
| case we need to start the Tx off again. */ |
| if( ( *plTHREEmpty ( long ) pdTRUE ) && ( xReturn pdPASS ) ) |
| { |
| xQueueReceive( xCharsForTx, &cOutChar, serNO_BLOCK ); |
| *plTHREEmpty = pdFALSE; |
| UART0_THR = cOutChar; |
| } |
| } |
| } |
| portEXIT_CRITICAL(); |
| return xReturn; |
| } |
| /*-----------------------------------------------------------*/ |
| voidvSerialClose( xComPortHandle xPort ) |
| { |
| /* Not supported as not required by the demo application. */ |
| ( void ) xPort; |
| } |
| /*-----------------------------------------------------------*/ |
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