| /* | |
| FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
| All rights reserved | |
| VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
| *************************************************************************** | |
| * * | |
| * FreeRTOS provides completely free yet professionally developed, * | |
| * robust, strictly quality controlled, supported, and cross * | |
| * platform software that has become a de facto standard. * | |
| * * | |
| * Help yourself get started quickly and support the FreeRTOS * | |
| * project by purchasing a FreeRTOS tutorial book, reference * | |
| * manual, or both from: http://www.FreeRTOS.org/Documentation * | |
| * * | |
| * Thank you! * | |
| * * | |
| *************************************************************************** | |
| 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. Full license text is available from the following | |
| link: http://www.freertos.org/a00114.html | |
| 1 tab == 4 spaces! | |
| *************************************************************************** | |
| * * | |
| * Having a problem? Start by reading the FAQ "My application does * | |
| * not run, what could be wrong?" * | |
| * * | |
| * http://www.FreeRTOS.org/FAQHelp.html * | |
| * * | |
| *************************************************************************** | |
| http://www.FreeRTOS.org - Documentation, books, training, latest versions, | |
| license and Real Time Engineers Ltd. contact details. | |
| http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
| including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
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| engineered and independently SIL3 certified version for use in safety and | |
| mission critical applications that require provable dependability. | |
| 1 tab == 4 spaces! | |
| */ | |
| /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR DEMO PURPOSES */ | |
| #include <stdlib.h> | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| #include "task.h" | |
| #include "serial.h" | |
| /* Constants required to setup the serial control register. */ | |
| #define ser8_BIT_MODE ( ( unsigned char ) 0x40 ) | |
| #define serRX_ENABLE ( ( unsigned char ) 0x10 ) | |
| /* Constants to setup the timer used to generate the baud rate. */ | |
| #define serCLOCK_DIV_48 ( ( unsigned char ) 0x03 ) | |
| #define serUSE_PRESCALED_CLOCK ( ( unsigned char ) 0x10 ) | |
| #define ser8BIT_WITH_RELOAD ( ( unsigned char ) 0x20 ) | |
| #define serSMOD ( ( unsigned char ) 0x10 ) | |
| static QueueHandle_t xRxedChars; | |
| static QueueHandle_t xCharsForTx; | |
| data static unsigned portBASE_TYPE uxTxEmpty; | |
| /*-----------------------------------------------------------*/ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| unsigned long ulReloadValue; | |
| const portFLOAT fBaudConst = ( portFLOAT ) configCPU_CLOCK_HZ * ( portFLOAT ) 2.0; | |
| unsigned char ucOriginalSFRPage; | |
| portENTER_CRITICAL(); | |
| { | |
| ucOriginalSFRPage = SFRPAGE; | |
| SFRPAGE = 0; | |
| uxTxEmpty = pdTRUE; | |
| /* Create the queues used by the com test task. */ | |
| xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) ); | |
| xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) ); | |
| /* Calculate the baud rate to use timer 1. */ | |
| ulReloadValue = ( unsigned long ) ( ( ( portFLOAT ) 256 - ( fBaudConst / ( portFLOAT ) ( 32 * ulWantedBaud ) ) ) + ( portFLOAT ) 0.5 ); | |
| /* Set timer one for desired mode of operation. */ | |
| TMOD &= 0x08; | |
| TMOD |= ser8BIT_WITH_RELOAD; | |
| SSTA0 |= serSMOD; | |
| /* Set the reload and start values for the time. */ | |
| TL1 = ( unsigned char ) ulReloadValue; | |
| TH1 = ( unsigned char ) ulReloadValue; | |
| /* Setup the control register for standard n, 8, 1 - variable baud rate. */ | |
| SCON = ser8_BIT_MODE | serRX_ENABLE; | |
| /* Enable the serial port interrupts */ | |
| ES = 1; | |
| /* Start the timer. */ | |
| TR1 = 1; | |
| SFRPAGE = ucOriginalSFRPage; | |
| } | |
| portEXIT_CRITICAL(); | |
| /* Unlike some ports, this serial code does not allow for more than one | |
| com port. We therefore don't return a pointer to a port structure and can | |
| instead just return NULL. */ | |
| return NULL; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialISR( void ) interrupt 4 | |
| { | |
| char cChar; | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| /* 8051 port interrupt routines MUST be placed within a critical section | |
| if taskYIELD() is used within the ISR! */ | |
| portENTER_CRITICAL(); | |
| { | |
| if( RI ) | |
| { | |
| /* Get the character and post it on the queue of Rxed characters. | |
| If the post causes a task to wake force a context switch if the woken task | |
| has a higher priority than the task we have interrupted. */ | |
| cChar = SBUF; | |
| RI = 0; | |
| xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
| } | |
| if( TI ) | |
| { | |
| if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == ( portBASE_TYPE ) pdTRUE ) | |
| { | |
| /* Send the next character queued for Tx. */ | |
| SBUF = cChar; | |
| } | |
| else | |
| { | |
| /* Queue empty, nothing to send. */ | |
| uxTxEmpty = pdTRUE; | |
| } | |
| TI = 0; | |
| } | |
| if( xHigherPriorityTaskWoken ) | |
| { | |
| portYIELD(); | |
| } | |
| } | |
| portEXIT_CRITICAL(); | |
| } | |
| /*-----------------------------------------------------------*/ | |
| portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime ) | |
| { | |
| /* There is only one port supported. */ | |
| ( 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 ( portBASE_TYPE ) pdTRUE; | |
| } | |
| else | |
| { | |
| return ( portBASE_TYPE ) pdFALSE; | |
| } | |
| } | |
| /*-----------------------------------------------------------*/ | |
| portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime ) | |
| { | |
| portBASE_TYPE xReturn; | |
| /* There is only one port supported. */ | |
| ( void ) pxPort; | |
| portENTER_CRITICAL(); | |
| { | |
| if( uxTxEmpty == pdTRUE ) | |
| { | |
| SBUF = cOutChar; | |
| uxTxEmpty = pdFALSE; | |
| xReturn = ( portBASE_TYPE ) pdTRUE; | |
| } | |
| else | |
| { | |
| xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime ); | |
| if( xReturn == ( portBASE_TYPE ) pdFALSE ) | |
| { | |
| xReturn = ( portBASE_TYPE ) pdTRUE; | |
| } | |
| } | |
| } | |
| portEXIT_CRITICAL(); | |
| return xReturn; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| /* Not implemented in this port. */ | |
| ( void ) xPort; | |
| } | |
| /*-----------------------------------------------------------*/ | |