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247 lines
8.9 KiB
C
247 lines
8.9 KiB
C
/*
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FreeRTOS V8.0.0:rc1 - 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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***************************************************************************
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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 has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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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 distribute
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>>! a combined work that includes FreeRTOS without being obliged to provide
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>>! the source code for proprietary components outside of the FreeRTOS
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>>! 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 from 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?" *
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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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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.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and 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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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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NOTE: This driver is primarily to test the scheduler functionality. It does
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not effectively use the buffers or DMA and is therefore not intended to be
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an example of an efficient driver. */
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/* Standard include file. */
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "task.h"
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/* Demo app include files. */
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#include "serial.h"
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/* Hardware definitions. */
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#define serNO_PARITY ( ( unsigned char ) 0x02 << 3 )
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#define ser8DATA_BITS ( ( unsigned char ) 0x03 )
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#define ser1STOP_BIT ( ( unsigned char ) 0x07 )
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#define serSYSTEM_CLOCK ( ( unsigned char ) 0xdd )
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#define serTX_OUTPUT ( ( unsigned char ) 0x04 )
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#define serRX_INPUT ( ( unsigned char ) 0x08 )
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#define serTX_ENABLE ( ( unsigned char ) 0x04 )
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#define serRX_ENABLE ( ( unsigned char ) 0x01 )
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#define serTX_INT ( ( unsigned char ) 0x01 )
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#define serRX_INT ( ( unsigned char ) 0x02 )
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/* The queues used to communicate between tasks and ISR's. */
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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/* Flag used to indicate the tx status. */
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static portBASE_TYPE xTxHasEnded = pdTRUE;
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/*-----------------------------------------------------------*/
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/* The UART interrupt handler. */
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void __attribute__( ( interrupt ) ) __cs3_isr_interrupt_78( void );
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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const unsigned long ulBaudRateDivisor = ( configCPU_CLOCK_HZ / ( 32UL * ulWantedBaud ) );
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/* Create the queues used by the com test task. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xTxHasEnded = pdTRUE;
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/* Set the pins to UART mode. */
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MCF_PAD_PUAPAR |= ( serTX_OUTPUT | serRX_INPUT );
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/* Reset the peripheral. */
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MCF_UART1_UCR = MCF_UART_UCR_RESET_RX;
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MCF_UART1_UCR = MCF_UART_UCR_RESET_TX;
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MCF_UART1_UCR = MCF_UART_UCR_RESET_ERROR;
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MCF_UART1_UCR = MCF_UART_UCR_RESET_BKCHGINT;
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MCF_UART1_UCR = MCF_UART_UCR_RESET_MR | MCF_UART_UCR_RX_DISABLED | MCF_UART_UCR_TX_DISABLED;
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/* Configure the UART. */
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MCF_UART1_UMR1 = serNO_PARITY | ser8DATA_BITS;
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MCF_UART1_UMR2 = ser1STOP_BIT;
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MCF_UART1_UCSR = serSYSTEM_CLOCK;
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MCF_UART1_UBG1 = ( unsigned char ) ( ( ulBaudRateDivisor >> 8UL ) & 0xffUL );
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MCF_UART1_UBG2 = ( unsigned char ) ( ulBaudRateDivisor & 0xffUL );
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/* Turn it on. */
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MCF_UART1_UCR = serTX_ENABLE | serRX_ENABLE;
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/* Configure the interrupt controller. Run the UARTs above the kernel
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interrupt priority for demo purposes. */
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MCF_INTC0_ICR14 = ( ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 2 ) << 3 );
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MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK14 | 0x01 );
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/* The Tx interrupt is not enabled until there is data to send. */
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MCF_UART1_UIMR = serRX_INT;
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/* Only a single port is implemented so we don't need to return anything. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Only one port is supported. */
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( void ) pxPort;
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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 pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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/* Only one port is supported. */
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( void ) pxPort;
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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, &cOutChar, xBlockTime ) != pdPASS )
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{
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return pdFAIL;
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}
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/* A critical section should not be required as xTxHasEnded will not be
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written to by the ISR if it is already 0 (is this correct?). */
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if( xTxHasEnded != pdFALSE )
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{
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xTxHasEnded = pdFALSE;
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MCF_UART1_UIMR = serRX_INT | serTX_INT;
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}
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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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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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void __cs3_isr_interrupt_78( void )
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{
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unsigned char ucChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xDoneSomething = pdTRUE;
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while( xDoneSomething != pdFALSE )
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{
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xDoneSomething = pdFALSE;
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/* Does the tx buffer contain space? */
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if( ( MCF_UART1_USR & MCF_UART_USR_TXRDY ) != 0x00 )
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{
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/* Are there any characters queued to be sent? */
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if( xQueueReceiveFromISR( xCharsForTx, &ucChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* Send the next char. */
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MCF_UART1_UTB = ucChar;
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xDoneSomething = pdTRUE;
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}
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else
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{
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/* Turn off the Tx interrupt until such time as another character
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is being transmitted. */
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MCF_UART1_UIMR = serRX_INT;
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xTxHasEnded = pdTRUE;
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}
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}
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if( MCF_UART1_USR & MCF_UART_USR_RXRDY )
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{
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ucChar = MCF_UART1_URB;
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xQueueSendFromISR( xRxedChars, &ucChar, &xHigherPriorityTaskWoken );
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xDoneSomething = pdTRUE;
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}
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}
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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