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Add Cortus demo.

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Richard Barry 2010-03-24 11:24:21 +00:00
parent e65ab7222c
commit a93c8d6659
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Demo/CORTUS_APS3_GCC/Demo/serial.c Normal file
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/*
FreeRTOS V6.0.3 - Copyright (C) 2010 Real Time Engineers Ltd.
***************************************************************************
* *
* If you are: *
* *
* + New to FreeRTOS, *
* + Wanting to learn FreeRTOS or multitasking in general quickly *
* + Looking for basic training, *
* + Wanting to improve your FreeRTOS skills and productivity *
* *
* then take a look at the FreeRTOS eBook *
* *
* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
* http://www.FreeRTOS.org/Documentation *
* *
* A pdf reference manual is also available. Both are usually delivered *
* to your inbox within 20 minutes to two hours when purchased between 8am *
* and 8pm GMT (although please allow up to 24 hours in case of *
* exceptional circumstances). 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 exception 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.
*/
/* Basic interrupt driven serial port driver for uart1.
*/
/* Standard includes. */
#include <stdlib.h>
/* Kernel includes. */
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
/* Demo application includes. */
#include <machine/uart.h>
#include <machine/ic.h>
#include "serial.h"
/*-----------------------------------------------------------*/
#define COM_BLOCK_RETRYTIME 10
/*-----------------------------------------------------------*/
void vUARTInterruptHandlerTxWrapper(void) __attribute((naked));
void vUARTInterruptHandlerRxWrapper(void) __attribute((naked));
/*-----------------------------------------------------------*/
/* Queues used to hold received characters, and characters waiting to be
transmitted. */
static xQueueHandle xRxedChars;
static xQueueHandle xCharsForTx;
extern unsigned portBASE_TYPE *pxVectorTable;
/*-----------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
/* Create the queues used to hold Rx and Tx characters. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
if( ( xRxedChars ) && ( xCharsForTx ) )
{
/* Set up interrupts */
/* tx interrupt will be enabled when we need to send something */
uart1->tx_mask = 0;
uart1->rx_mask = 1;
irq[IRQ_UART1_TX].ien = 1;
irq[IRQ_UART1_TX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
irq[IRQ_UART1_RX].ien = 1;
irq[IRQ_UART1_RX].ipl = portSYSTEM_INTERRUPT_PRIORITY_LEVEL;
}
return ( xComPortHandle ) 0;
}
/*-----------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
{
/* The port handle is not required as this driver only supports uart1. */
(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;
}
}
/*-----------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
int i;
signed char *pChNext;
/* Send each character in the string, one at a time. */
pChNext = ( signed char * )pcString;
for( i = 0; i < usStringLength; i++ )
{
/* Block until character has been transmitted. */
while( xSerialPutChar( pxPort, *pChNext, COM_BLOCK_RETRYTIME ) != pdTRUE ); pChNext++;
}
}
/*-----------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
{
( void ) pxPort;
/* 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. */
uart1->tx_mask = 1;
return pdPASS;
}
/*-----------------------------------------------------------*/
void vSerialClose( xComPortHandle xPort )
{
/* Not supported as not required by the demo application. */
( void ) xPort;
}
/*-----------------------------------------------------------*/
void interrupt_handler( IRQ_UART1_TX )
{
static signed char cChar;
static portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
portSAVE_CONTEXT_REDUCED();
/* The interrupt was caused by the transmit fifo having space for at least one
character. Are there any more characters to transmit? */
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
{
/* A character was retrieved from the queue so can be sent to the uart now. */
uart1->tx_data = cChar;
}
else
{
/* Queue empty, nothing to send so turn off the Tx interrupt. */
uart1->tx_mask = 0;
}
/* If an event caused a task to unblock then we call "Yield from ISR" to
ensure that the unblocked task is the task that executes when the interrupt
completes if the unblocked task has a priority higher than the interrupted
task. */
if( xHigherPriorityTaskWoken )
{
portYIELD_FROM_ISR();
}
portRESTORE_CONTEXT_REDUCED();
}
/*-----------------------------------------------------------*/
void interrupt_handler( IRQ_UART1_RX )
{
static signed char cChar;
static portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
portSAVE_CONTEXT_REDUCED();
/* The interrupt was caused by the receiver getting data. */
cChar = uart1->rx_data;
(void)xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken);
/* If an event caused a task to unblock then we call "Yield from ISR" to
ensure that the unblocked task is the task that executes when the interrupt
completes if the unblocked task has a priority higher than the interrupted
task. */
if( xHigherPriorityTaskWoken )
{
portYIELD_FROM_ISR();
}
portRESTORE_CONTEXT_REDUCED();
}
/*-----------------------------------------------------------*/