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.
217 lines
8.3 KiB
C
217 lines
8.3 KiB
C
/*
|
|
FreeRTOS V6.1.1 - Copyright (C) 2011 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 books - available as PDF or paperback *
|
|
* *
|
|
* "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 UART
|
|
*/
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
#include "queue.h"
|
|
#include "task.h"
|
|
|
|
/* Demo application includes. */
|
|
#include "serial.h"
|
|
|
|
/* Microblaze driver includes. */
|
|
#include "xuartlite_l.h"
|
|
#include "xintc_l.h"
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Queues used to hold received characters, and characters waiting to be
|
|
transmitted. */
|
|
static xQueueHandle xRxedChars;
|
|
static xQueueHandle xCharsForTx;
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
|
|
{
|
|
unsigned long ulControlReg, ulMask;
|
|
|
|
/* NOTE: The baud rate used by this driver is determined by the hardware
|
|
parameterization of the UART Lite peripheral, and the baud value passed to
|
|
this function has no effect. */
|
|
|
|
/* 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 ) )
|
|
{
|
|
/* Disable the interrupt. */
|
|
XUartLite_mDisableIntr( XPAR_RS232_UART_BASEADDR );
|
|
|
|
/* Flush the fifos. */
|
|
ulControlReg = XIo_In32( XPAR_RS232_UART_BASEADDR + XUL_STATUS_REG_OFFSET );
|
|
XIo_Out32( XPAR_RS232_UART_BASEADDR + XUL_CONTROL_REG_OFFSET, ulControlReg | XUL_CR_FIFO_TX_RESET | XUL_CR_FIFO_RX_RESET );
|
|
|
|
/* Enable the interrupt again. The interrupt controller has not yet been
|
|
initialised so there is no chance of receiving an interrupt until the
|
|
scheduler has been started. */
|
|
XUartLite_mEnableIntr( XPAR_RS232_UART_BASEADDR );
|
|
|
|
/* Enable the interrupt in the interrupt controller while maintaining
|
|
all the other bit settings. */
|
|
ulMask = XIntc_In32( ( XPAR_OPB_INTC_0_BASEADDR + XIN_IER_OFFSET ) );
|
|
ulMask |= XPAR_RS232_UART_INTERRUPT_MASK;
|
|
XIntc_Out32( ( XPAR_OPB_INTC_0_BASEADDR + XIN_IER_OFFSET ), ( ulMask ) );
|
|
XIntc_mAckIntr( XPAR_INTC_SINGLE_BASEADDR, 2 );
|
|
}
|
|
|
|
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 one UART. */
|
|
( 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;
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
|
|
{
|
|
portBASE_TYPE xReturn = pdTRUE;
|
|
|
|
portENTER_CRITICAL();
|
|
{
|
|
/* If the UART FIFO is full we can block posting the new data on the
|
|
Tx queue. */
|
|
if( XUartLite_mIsTransmitFull( XPAR_RS232_UART_BASEADDR ) )
|
|
{
|
|
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
|
|
{
|
|
xReturn = pdFAIL;
|
|
}
|
|
}
|
|
/* Otherwise, if there is data already in the queue we should add the
|
|
new data to the back of the queue to ensure the sequencing is
|
|
maintained. */
|
|
else if( uxQueueMessagesWaiting( xCharsForTx ) )
|
|
{
|
|
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
|
|
{
|
|
xReturn = pdFAIL;
|
|
}
|
|
}
|
|
/* If the UART FIFO is not full and there is no data already in the
|
|
queue we can write directly to the FIFO without disrupting the
|
|
sequence. */
|
|
else
|
|
{
|
|
XIo_Out32( XPAR_RS232_UART_BASEADDR + XUL_TX_FIFO_OFFSET, cOutChar );
|
|
}
|
|
}
|
|
portEXIT_CRITICAL();
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSerialClose( xComPortHandle xPort )
|
|
{
|
|
/* Not supported as not required by the demo application. */
|
|
( void ) xPort;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSerialISR( void *pvBaseAddress )
|
|
{
|
|
unsigned long ulISRStatus;
|
|
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
|
|
char cChar;
|
|
|
|
/* Determine the cause of the interrupt. */
|
|
ulISRStatus = XIo_In32( XPAR_RS232_UART_BASEADDR + XUL_STATUS_REG_OFFSET );
|
|
|
|
if( ( ulISRStatus & ( XUL_SR_RX_FIFO_FULL | XUL_SR_RX_FIFO_VALID_DATA ) ) != 0 )
|
|
{
|
|
/* A character is available - place it in the queue of received
|
|
characters. This might wake a task that was blocked waiting for
|
|
data. */
|
|
cChar = ( char )XIo_In32( XPAR_RS232_UART_BASEADDR + XUL_RX_FIFO_OFFSET );
|
|
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
|
|
}
|
|
|
|
if( ( ulISRStatus & XUL_SR_TX_FIFO_EMPTY ) != 0 )
|
|
{
|
|
/* There is space in the FIFO - if there are any characters queue for
|
|
transmission they can be send to the UART now. This might unblock a
|
|
task that was waiting for space to become available on the Tx queue. */
|
|
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
|
|
{
|
|
XIo_Out32( XPAR_RS232_UART_BASEADDR + XUL_TX_FIFO_OFFSET, cChar );
|
|
}
|
|
}
|
|
|
|
/* If we woke any tasks we may require a context switch. */
|
|
if( xHigherPriorityTaskWoken )
|
|
{
|
|
portYIELD_FROM_ISR();
|
|
}
|
|
}
|