| /* | |
| FreeRTOS V8.1.2 - 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 | |
| compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
| http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High | |
| Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS | |
| licenses offer ticketed support, indemnification and middleware. | |
| http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
| 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 port 1. | |
| Note that this driver is written to test the RTOS port and is not intended | |
| to represent an optimised solution. */ | |
| /* Processor Expert generated includes. */ | |
| #include "com0.h" | |
| /* Scheduler include files. */ | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| #include "task.h" | |
| /* Demo application include files. */ | |
| #include "serial.h" | |
| /* The queues used to communicate between the task code and the interrupt | |
| service routines. */ | |
| static QueueHandle_t xRxedChars; | |
| static QueueHandle_t xCharsForTx; | |
| /* Interrupt identification bits. */ | |
| #define serOVERRUN_INTERRUPT ( 0x08 ) | |
| #define serRX_INTERRUPT ( 0x20 ) | |
| #define serTX_INTERRUPT ( 0x80 ) | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * Initialise port for interrupt driven communications. | |
| */ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| /* Hardware setup is performed by the Processor Expert generated code. | |
| This function just creates the queues used to communicate between the | |
| interrupt code and the task code - then sets the required baud rate. */ | |
| xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
| xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
| COM0_SetBaudRateMode( ( char ) ulWantedBaud ); | |
| return NULL; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime ) | |
| { | |
| /* Get the next character from the buffer queue. Return false if no characters | |
| are available, or arrive before xBlockTime expires. */ | |
| if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) ) | |
| { | |
| return pdTRUE; | |
| } | |
| else | |
| { | |
| return pdFALSE; | |
| } | |
| } | |
| /*-----------------------------------------------------------*/ | |
| signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime ) | |
| { | |
| /* Place the character in the queue of characters to be transmitted. */ | |
| if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
| { | |
| return pdFAIL; | |
| } | |
| /* Turn on the Tx interrupt so the ISR will remove the character from the | |
| queue and send it. This does not need to be in a critical section as | |
| if the interrupt has already removed the character the next interrupt | |
| will simply turn off the Tx interrupt again. */ | |
| SCI0CR2_SCTIE = 1;; | |
| return pdPASS; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| /* Not supported. */ | |
| ( void ) xPort; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| /* | |
| * Interrupt service routine for the serial port. Must be in non-banked | |
| * memory. | |
| */ | |
| #pragma CODE_SEG __NEAR_SEG NON_BANKED | |
| __interrupt void vCOM0_ISR( void ) | |
| { | |
| volatile unsigned char ucByte, ucStatus; | |
| portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
| /* What caused the interrupt? */ | |
| ucStatus = SCI0SR1; | |
| if( ucStatus & serOVERRUN_INTERRUPT ) | |
| { | |
| /* The interrupt was caused by an overrun. Clear the error by reading | |
| the data register. */ | |
| ucByte = SCI0DRL; | |
| } | |
| if( ucStatus & serRX_INTERRUPT ) | |
| { | |
| /* The interrupt was caused by a character being received. | |
| Read the received byte. */ | |
| ucByte = SCI0DRL; | |
| /* Post the character onto the queue of received characters - noting | |
| whether or not this wakes a task. */ | |
| xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, &xHigherPriorityTaskWoken ); | |
| } | |
| if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) ) | |
| { | |
| /* The interrupt was caused by a character being transmitted. */ | |
| if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
| { | |
| /* Clear the SCRF bit. */ | |
| SCI0DRL = ucByte; | |
| } | |
| else | |
| { | |
| /* Disable transmit interrupt */ | |
| SCI0CR2_SCTIE = 0; | |
| } | |
| } | |
| if( xHigherPriorityTaskWoken ) | |
| { | |
| portYIELD(); | |
| } | |
| } | |
| #pragma CODE_SEG DEFAULT | |