You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
195 lines
7.5 KiB
C
195 lines
7.5 KiB
C
/*
|
|
FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
|
|
|
|
|
|
***************************************************************************
|
|
* *
|
|
* FreeRTOS tutorial books are available in pdf and paperback. *
|
|
* Complete, revised, and edited pdf reference manuals are also *
|
|
* available. *
|
|
* *
|
|
* Purchasing FreeRTOS documentation will not only help you, by *
|
|
* ensuring you get running as quickly as possible and with an *
|
|
* in-depth knowledge of how to use FreeRTOS, it will also help *
|
|
* the FreeRTOS project to continue with its mission of providing *
|
|
* professional grade, cross platform, de facto standard solutions *
|
|
* for microcontrollers - completely free of charge! *
|
|
* *
|
|
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
|
|
* *
|
|
* Thank you for using FreeRTOS, and 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 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. 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 UART0.
|
|
|
|
***Note*** This example uses queues to send each character into an interrupt
|
|
service routine and out of an interrupt service routine individually. This
|
|
is done to demonstrate queues being used in an interrupt, and to deliberately
|
|
load the system to test the FreeRTOS port. It is *NOT* meant to be an
|
|
example of an efficient implementation. An efficient implementation should
|
|
use FIFOs or DMA if available, and only use FreeRTOS API functions when
|
|
enough has been received to warrant a task being unblocked to process the
|
|
data.
|
|
*/
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
#include "queue.h"
|
|
#include "task.h" /*_RB_ remove this when the file is working. */
|
|
#include "comtest_strings.h"
|
|
|
|
/* Library includes. */
|
|
#include "xuartlite.h"
|
|
#include "xuartlite_l.h"
|
|
|
|
/* Demo application includes. */
|
|
#include "serial.h"
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount );
|
|
static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount );
|
|
|
|
static XUartLite xUartLiteInstance;
|
|
|
|
/* The queue used to hold received characters. */
|
|
static xQueueHandle xRxedChars;
|
|
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
|
|
{
|
|
portBASE_TYPE xStatus;
|
|
|
|
/* Create the queue used to hold Rx characters. */
|
|
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
|
|
|
|
/* If the queue was created correctly then setup the serial port
|
|
hardware. */
|
|
if( xRxedChars != NULL )
|
|
{
|
|
xStatus = XUartLite_Initialize( &xUartLiteInstance, XPAR_UARTLITE_1_DEVICE_ID );
|
|
|
|
if( xStatus == XST_SUCCESS )
|
|
{
|
|
/* Complete initialisation of the UART and its associated
|
|
interrupts. */
|
|
XUartLite_ResetFifos( &xUartLiteInstance );
|
|
XUartLite_SetRecvHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvRxHandler, NULL );
|
|
XUartLite_SetSendHandler( &xUartLiteInstance, ( XUartLite_Handler ) prvTxHandler, NULL );
|
|
xStatus = xPortInstallInterruptHandler( XPAR_INTC_0_UARTLITE_1_VEC_ID, ( XInterruptHandler ) XUartLite_InterruptHandler, &xUartLiteInstance );
|
|
XUartLite_EnableIntr( xUartLiteInstance.RegBaseAddress );
|
|
vPortEnableInterrupt( XPAR_INTC_0_UARTLITE_1_VEC_ID );
|
|
}
|
|
|
|
configASSERT( xStatus == pdPASS );
|
|
}
|
|
|
|
/* This demo file only supports a single port but something must be
|
|
returned to comply with the standard demo header file. */
|
|
return ( xComPortHandle ) 0;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
|
|
{
|
|
/* The port handle is not required as this driver only supports one port. */
|
|
( 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 portBASE_TYPE uxStringLength )
|
|
{
|
|
XUartLite_Send( &xUartLiteInstance, ( unsigned char * ) pcString, uxStringLength );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
|
|
{
|
|
/* Only vSerialPutString() is used in this demo. */
|
|
( void ) pxPort;
|
|
( void ) cOutChar;
|
|
( void ) xBlockTime;
|
|
|
|
return pdFALSE;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSerialClose( xComPortHandle xPort )
|
|
{
|
|
/* Not supported as not required by the demo application. */
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvRxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount )
|
|
{
|
|
signed char cRxedChar;
|
|
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
|
|
|
|
while( XUartLite_IsReceiveEmpty( xUartLiteInstance.RegBaseAddress ) == pdFALSE )
|
|
{
|
|
cRxedChar = XUartLite_ReadReg( xUartLiteInstance.RegBaseAddress, XUL_RX_FIFO_OFFSET);
|
|
xQueueSendFromISR( xRxedChars, &cRxedChar, &xHigherPriorityTaskWoken );
|
|
}
|
|
|
|
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvTxHandler( void *pvUnused, unsigned portBASE_TYPE uxByteCount )
|
|
{
|
|
portNOP();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|