ab964f3c9d
+ Introduced API function xTaskResumeFromISR(). Same functionality as xTaskResume(), but can be called from within an interrupt service routine. + Optimised vListInsert() in the case when the wake time is the maximum tick count value. + Bug fix: The 'value' of the event list item is updated when the priority of a task is changed. Previously only the priority of the TCB itself was changed. + vTaskPrioritySet() and vTaskResume() no longer use the event list item. This has not been necessary since V4.0.1 when the xMissedYield handling was added. + Lowered the PCLK setting on the ARM9 STR9 demo from 96MHz to 48MHz. + When ending the scheduler - do not try to attempt a context switch when deleting the current task. + SAM7X EMAC drivers: Corrected the Rx frame length mask when obtaining the length from the rx descriptor.
196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
/*
|
|
FreeRTOS.org V4.0.5 - Copyright (C) 2003-2006 Richard Barry.
|
|
|
|
This file is part of the FreeRTOS.org distribution.
|
|
|
|
FreeRTOS.org is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
FreeRTOS.org 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
|
|
along with FreeRTOS.org; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
A special exception to the GPL can be applied should you wish to distribute
|
|
a combined work that includes FreeRTOS.org, without being obliged to provide
|
|
the source code for any proprietary components. See the licensing section
|
|
of http://www.FreeRTOS.org for full details of how and when the exception
|
|
can be applied.
|
|
|
|
***************************************************************************
|
|
See http://www.FreeRTOS.org for documentation, latest information, license
|
|
and contact details. Please ensure to read the configuration and relevant
|
|
port sections of the online documentation.
|
|
***************************************************************************
|
|
*/
|
|
|
|
|
|
/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR IAR AVR PORT. */
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include "FreeRTOS.h"
|
|
#include "queue.h"
|
|
#include "task.h"
|
|
#include "serial.h"
|
|
|
|
#define serBAUD_DIV_CONSTANT ( ( unsigned portLONG ) 16 )
|
|
|
|
/* Constants for writing to UCSRB. */
|
|
#define serRX_INT_ENABLE ( ( unsigned portCHAR ) 0x80 )
|
|
#define serRX_ENABLE ( ( unsigned portCHAR ) 0x10 )
|
|
#define serTX_ENABLE ( ( unsigned portCHAR ) 0x08 )
|
|
#define serTX_INT_ENABLE ( ( unsigned portCHAR ) 0x20 )
|
|
|
|
/* Constants for writing to UCSRC. */
|
|
#define serUCSRC_SELECT ( ( unsigned portCHAR ) 0x80 )
|
|
#define serEIGHT_DATA_BITS ( ( unsigned portCHAR ) 0x06 )
|
|
|
|
static xQueueHandle xRxedChars;
|
|
static xQueueHandle xCharsForTx;
|
|
|
|
#define vInterruptOn() \
|
|
{ \
|
|
unsigned portCHAR ucByte; \
|
|
\
|
|
ucByte = UCSRB; \
|
|
ucByte |= serTX_INT_ENABLE; \
|
|
outb( UCSRB, ucByte ); \
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#define vInterruptOff() \
|
|
{ \
|
|
unsigned portCHAR ucByte; \
|
|
\
|
|
ucByte = UCSRB; \
|
|
ucByte &= ~serTX_INT_ENABLE; \
|
|
outb( UCSRB, ucByte ); \
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
|
|
{
|
|
unsigned portLONG ulBaudRateCounter;
|
|
unsigned portCHAR ucByte;
|
|
|
|
portENTER_CRITICAL();
|
|
{
|
|
/* Create the queues used by the com test task. */
|
|
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
|
|
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
|
|
|
|
/* Calculate the baud rate register value from the equation in the
|
|
data sheet. */
|
|
ulBaudRateCounter = ( configCPU_CLOCK_HZ / ( serBAUD_DIV_CONSTANT * ulWantedBaud ) ) - ( unsigned portLONG ) 1;
|
|
|
|
/* Set the baud rate. */
|
|
ucByte = ( unsigned portCHAR ) ( ulBaudRateCounter & ( unsigned portLONG ) 0xff );
|
|
outb( UBRRL, ucByte );
|
|
|
|
ulBaudRateCounter >>= ( unsigned portLONG ) 8;
|
|
ucByte = ( unsigned portCHAR ) ( ulBaudRateCounter & ( unsigned portLONG ) 0xff );
|
|
outb( UBRRH, ucByte );
|
|
|
|
/* Enable the Rx interrupt. The Tx interrupt will get enabled
|
|
later. Also enable the Rx and Tx. */
|
|
outb( UCSRB, serRX_INT_ENABLE | serRX_ENABLE | serTX_ENABLE );
|
|
|
|
/* Set the data bits to 8. */
|
|
outb( UCSRC, serUCSRC_SELECT | serEIGHT_DATA_BITS );
|
|
}
|
|
portEXIT_CRITICAL();
|
|
|
|
/* Unlike other ports, this serial code does not allow for more than one
|
|
com port. We therefore don't return a pointer to a port structure and can
|
|
instead just return NULL. */
|
|
return NULL;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
|
|
{
|
|
/* 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 portCHAR cOutChar, portTickType xBlockTime )
|
|
{
|
|
/* Return false if after the block time there is no room on the Tx queue. */
|
|
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
|
|
{
|
|
return pdFAIL;
|
|
}
|
|
|
|
vInterruptOn();
|
|
|
|
return pdPASS;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSerialClose( xComPortHandle xPort )
|
|
{
|
|
unsigned portCHAR ucByte;
|
|
|
|
/* Turn off the interrupts. We may also want to delete the queues and/or
|
|
re-install the original ISR. */
|
|
|
|
portENTER_CRITICAL();
|
|
{
|
|
vInterruptOff();
|
|
ucByte = UCSRB;
|
|
ucByte &= ~serRX_INT_ENABLE;
|
|
outb( UCSRB, ucByte );
|
|
}
|
|
portEXIT_CRITICAL();
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
__interrupt void SIG_UART_RECV( void )
|
|
{
|
|
signed portCHAR cChar;
|
|
|
|
/* Get the character and post it on the queue of Rxed characters.
|
|
If the post causes a task to wake force a context switch as the woken task
|
|
may have a higher priority than the task we have interrupted. */
|
|
cChar = UDR;
|
|
|
|
if( xQueueSendFromISR( xRxedChars, &cChar, pdFALSE ) )
|
|
{
|
|
taskYIELD();
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
__interrupt void SIG_UART_DATA( void )
|
|
{
|
|
signed portCHAR cChar, cTaskWoken;
|
|
|
|
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &cTaskWoken ) == pdTRUE )
|
|
{
|
|
/* Send the next character queued for Tx. */
|
|
outb( UDR, cChar );
|
|
}
|
|
else
|
|
{
|
|
/* Queue empty, nothing to send. */
|
|
vInterruptOff();
|
|
}
|
|
}
|
|
|