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242 lines
10 KiB
C
242 lines
10 KiB
C
/*
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FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available on the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?". Have you defined configASSERT()? *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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***************************************************************************
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* *
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* Investing in training allows your team to be as productive as *
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* possible as early as possible, lowering your overall development *
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* cost, and enabling you to bring a more robust product to market *
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* earlier than would otherwise be possible. Richard Barry is both *
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* the architect and key author of FreeRTOS, and so also the world's *
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* leading authority on what is the world's most popular real time *
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* kernel for deeply embedded MCU designs. Obtaining your training *
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* from Richard ensures your team will gain directly from his in-depth *
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* product knowledge and years of usage experience. Contact Real Time *
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* Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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* by Richard Barry: http://www.FreeRTOS.org/contact
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* *
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***************************************************************************
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***************************************************************************
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* *
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* You are receiving this top quality software for free. Please play *
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* fair and reciprocate by reporting any suspected issues and *
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* participating in the community forum: *
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* http://www.FreeRTOS.org/support *
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* *
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* Thank you! *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/*
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Changes from V3.0.0
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+ ISRcode removed. Is now pulled inline to reduce stack-usage.
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Changes from V3.0.1
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*/
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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. */
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/* Scheduler header files. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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#include "serial.h"
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/* Hardware pin definitions. */
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#define serTX_PIN bTRC6
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#define serRX_PIN bTRC7
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/* Bit/register definitions. */
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#define serINPUT ( 1 )
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#define serOUTPUT ( 0 )
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#define serINTERRUPT_ENABLED ( 1 )
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/* All ISR's use the PIC18 low priority interrupt. */
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#define serLOW_PRIORITY ( 0 )
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/*-----------------------------------------------------------*/
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/* Queues to interface between comms API and interrupt routines. */
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QueueHandle_t xRxedChars;
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QueueHandle_t xCharsForTx;
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portBASE_TYPE xHigherPriorityTaskWoken;
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned char ucQueueLength )
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{
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unsigned short usSPBRG;
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/* Create the queues used by the ISR's to interface to tasks. */
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xRxedChars = xQueueCreate( ucQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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xCharsForTx = xQueueCreate( ucQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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portENTER_CRITICAL();
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/* Setup the IO pins to enable the USART IO. */
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serTX_PIN = serINPUT; // YES really! See datasheet
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serRX_PIN = serINPUT;
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/* Set the TX config register. */
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TXSTA = 0b00100000;
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// ||||||||--bit0: TX9D = n/a
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// |||||||---bit1: TRMT = ReadOnly
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// ||||||----bit2: BRGH = High speed
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// |||||-----bit3: SENDB = n/a
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// ||||------bit4: SYNC = Asynchronous mode
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// |||-------bit5: TXEN = Transmit enable
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// ||--------bit6: TX9 = 8-bit transmission
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// |---------bit7: CSRC = n/a
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/* Set the Receive config register. */
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RCSTA = 0b10010000;
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// ||||||||--bit0: RX9D = ReadOnly
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// |||||||---bit1: OERR = ReadOnly
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// ||||||----bit2: FERR = ReadOnly
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// |||||-----bit3: ADDEN = n/a
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// ||||------bit4: CREN = Enable receiver
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// |||-------bit5: SREN = n/a
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// ||--------bit6: RX9 = 8-bit reception
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// |---------bit7: SPEN = Serial port enabled
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/* Calculate the baud rate generator value.
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We use low-speed (BRGH=0), the formula is
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SPBRG = ( ( FOSC / Desired Baud Rate ) / 64 ) - 1 */
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usSPBRG = ( ( APROCFREQ / ulWantedBaud ) / 64 ) - 1;
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if( usSPBRG > 255 )
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{
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SPBRG = 255;
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}
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else
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{
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SPBRG = usSPBRG;
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}
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/* Set the serial interrupts to use the same priority as the tick. */
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bTXIP = serLOW_PRIORITY;
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bRCIP = serLOW_PRIORITY;
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/* Enable the Rx interrupt now, the Tx interrupt will get enabled when
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we have data to send. */
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bRCIE = serINTERRUPT_ENABLED;
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portEXIT_CRITICAL();
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/* Unlike other ports, this serial code does not allow for more than one
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com port. We therefore don't return a pointer to a port structure and
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can instead just return NULL. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInit( eCOMPort ePort, eBaud eWantedBaud, eParity eWantedParity, eDataBits eWantedDataBits, eStopBits eWantedStopBits, unsigned char ucBufferLength )
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{
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/* This is not implemented in this port.
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Use xSerialPortInitMinimal() instead. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Get the next character from the buffer. Return false if no characters
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are available, or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return ( char ) pdTRUE;
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}
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return ( char ) pdFALSE;
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, char cOutChar, TickType_t xBlockTime )
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{
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/* Return false if after the block time there is no room on the Tx queue. */
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if( xQueueSend( xCharsForTx, ( const void * ) &cOutChar, xBlockTime ) != ( char ) pdPASS )
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{
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return pdFAIL;
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}
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/* Turn interrupt on - ensure the compiler only generates a single
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instruction for this. */
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bTXIE = serINTERRUPT_ENABLED;
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Not implemented for this port.
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To implement, turn off the interrupts and delete the memory
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allocated to the queues. */
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}
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