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    /openrisc/trunk/rtos/freertos-6.1.1/Demo/dsPIC_MPLAB
    from Rev 591 to Rev 592
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  •

Rev 591 → Rev 592

/serial/serial.c
0,0 → 1,252
/*
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.
 
NOTE: This driver is primarily to test the scheduler functionality. It does
not effectively use the buffers or DMA and is therefore not intended to be
an example of an efficient driver. */
 
/* Standard include file. */
#include <stdlib.h>
 
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
 
/* Demo app include files. */
#include "serial.h"
 
/* Hardware setup. */
#define serOUTPUT 0
#define serINPUT 1
#define serLOW_SPEED 0
#define serONE_STOP_BIT 0
#define serEIGHT_DATA_BITS_NO_PARITY 0
#define serNORMAL_IDLE_STATE 0
#define serAUTO_BAUD_OFF 0
#define serLOOPBACK_OFF 0
#define serWAKE_UP_DISABLE 0
#define serNO_HARDWARE_FLOW_CONTROL 0
#define serSTANDARD_IO 0
#define serNO_IRDA 0
#define serCONTINUE_IN_IDLE_MODE 0
#define serUART_ENABLED 1
#define serINTERRUPT_ON_SINGLE_CHAR 0
#define serTX_ENABLE 1
#define serINTERRUPT_ENABLE 1
#define serINTERRUPT_DISABLE 0
#define serCLEAR_FLAG 0
#define serSET_FLAG 1
 
 
/* The queues used to communicate between tasks and ISR's. */
static xQueueHandle xRxedChars;
static xQueueHandle xCharsForTx;
 
static portBASE_TYPE xTxHasEnded;
/*-----------------------------------------------------------*/
 
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
char cChar;
 
/* Create the queues used by the com test task. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
 
/* Setup the UART. */
U2MODEbits.BRGH = serLOW_SPEED;
U2MODEbits.STSEL = serONE_STOP_BIT;
U2MODEbits.PDSEL = serEIGHT_DATA_BITS_NO_PARITY;
U2MODEbits.ABAUD = serAUTO_BAUD_OFF;
U2MODEbits.LPBACK = serLOOPBACK_OFF;
U2MODEbits.WAKE = serWAKE_UP_DISABLE;
U2MODEbits.UEN = serNO_HARDWARE_FLOW_CONTROL;
U2MODEbits.IREN = serNO_IRDA;
U2MODEbits.USIDL = serCONTINUE_IN_IDLE_MODE;
U2MODEbits.UARTEN = serUART_ENABLED;
 
U2BRG = (unsigned short)(( (float)configCPU_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
 
U2STAbits.URXISEL = serINTERRUPT_ON_SINGLE_CHAR;
U2STAbits.UTXEN = serTX_ENABLE;
U2STAbits.UTXINV = serNORMAL_IDLE_STATE;
U2STAbits.UTXISEL0 = serINTERRUPT_ON_SINGLE_CHAR;
U2STAbits.UTXISEL1 = serINTERRUPT_ON_SINGLE_CHAR;
 
/* It is assumed that this function is called prior to the scheduler being
started. Therefore interrupts must not be allowed to occur yet as they
may attempt to perform a context switch. */
portDISABLE_INTERRUPTS();
 
IFS1bits.U2RXIF = serCLEAR_FLAG;
IFS1bits.U2TXIF = serCLEAR_FLAG;
IPC7bits.U2RXIP = configKERNEL_INTERRUPT_PRIORITY;
IPC7bits.U2TXIP = configKERNEL_INTERRUPT_PRIORITY;
IEC1bits.U2TXIE = serINTERRUPT_ENABLE;
IEC1bits.U2RXIE = serINTERRUPT_ENABLE;
 
/* Clear the Rx buffer. */
while( U2STAbits.URXDA == serSET_FLAG )
{
cChar = U2RXREG;
}
 
xTxHasEnded = pdTRUE;
 
return NULL;
}
/*-----------------------------------------------------------*/
 
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
{
/* Only one port is supported. */
( 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 )
{
/* Only one port is supported. */
( void ) pxPort;
 
/* Return false if after the block time there is no room on the Tx queue. */
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
{
return pdFAIL;
}
 
/* A critical section should not be required as xTxHasEnded will not be
written to by the ISR if it is already 0 (is this correct?). */
if( xTxHasEnded )
{
xTxHasEnded = pdFALSE;
IFS1bits.U2TXIF = serSET_FLAG;
}
 
return pdPASS;
}
/*-----------------------------------------------------------*/
 
void vSerialClose( xComPortHandle xPort )
{
}
/*-----------------------------------------------------------*/
 
void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt( void )
{
char cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
 
/* 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. */
IFS1bits.U2RXIF = serCLEAR_FLAG;
while( U2STAbits.URXDA )
{
cChar = U2RXREG;
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
}
 
if( xHigherPriorityTaskWoken != pdFALSE )
{
taskYIELD();
}
}
/*-----------------------------------------------------------*/
 
void __attribute__((__interrupt__, auto_psv)) _U2TXInterrupt( void )
{
signed char cChar;
portBASE_TYPE xTaskWoken = pdFALSE;
 
/* If the transmit buffer is full we cannot get the next character.
Another interrupt will occur the next time there is space so this does
not matter. */
IFS1bits.U2TXIF = serCLEAR_FLAG;
while( !( U2STAbits.UTXBF ) )
{
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWoken ) == pdTRUE )
{
/* Send the next character queued for Tx. */
U2TXREG = cChar;
}
else
{
/* Queue empty, nothing to send. */
xTxHasEnded = pdTRUE;
break;
}
}
 
if( xTaskWoken != pdFALSE )
{
taskYIELD();
}
}
 
 
/timertest.c
0,0 → 1,162
/*
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.
*/
 
/* High speed timer test as described in main.c. */
 
 
/* Scheduler includes. */
#include "FreeRTOS.h"
 
/* Demo includes. */
#include "partest.h"
 
/* The number of interrupts to pass before we start looking at the jitter. */
#define timerSETTLE_TIME 5
 
/* The maximum value the 16bit timer can contain. */
#define timerMAX_COUNT 0xffff
 
/*-----------------------------------------------------------*/
 
/*
* Measure the time between this interrupt and the previous interrupt to
* calculate the timing jitter. Remember the maximum value the jitter has
* ever been calculated to be.
*/
static void prvCalculateAndStoreJitter( void );
 
/*-----------------------------------------------------------*/
 
/* The maximum time (in processor clocks) between two consecutive timer
interrupts so far. */
unsigned portSHORT usMaxJitter = 0;
 
/*-----------------------------------------------------------*/
 
void vSetupTimerTest( unsigned portSHORT usFrequencyHz )
{
/* T2 is used to generate interrupts. T4 is used to provide an accurate
time measurement. */
T2CON = 0;
T4CON = 0;
TMR2 = 0;
TMR4 = 0;
 
/* Timer 2 is going to interrupt at usFrequencyHz Hz. */
PR2 = ( unsigned portSHORT ) ( configCPU_CLOCK_HZ / ( unsigned portLONG ) usFrequencyHz );
 
/* Timer 4 is going to free run from minimum to maximum value. */
PR4 = ( unsigned portSHORT ) timerMAX_COUNT;
 
/* Setup timer 2 interrupt priority to be above the kernel priority so
the timer jitter is not effected by the kernel activity. */
IPC1bits.T2IP = configKERNEL_INTERRUPT_PRIORITY + 1;
 
/* Clear the interrupt as a starting condition. */
IFS0bits.T2IF = 0;
 
/* Enable the interrupt. */
IEC0bits.T2IE = 1;
 
/* Start both timers. */
T2CONbits.TON = 1;
T4CONbits.TON = 1;
}
/*-----------------------------------------------------------*/
 
static void prvCalculateAndStoreJitter( void )
{
static unsigned portSHORT usLastCount = 0, usSettleCount = 0;
unsigned portSHORT usThisCount, usDifference;
 
/* Capture the timer value as we enter the interrupt. */
usThisCount = TMR4;
 
if( usSettleCount >= timerSETTLE_TIME )
{
/* What is the difference between the timer value in this interrupt
and the value from the last interrupt. */
usDifference = usThisCount - usLastCount;
 
/* Store the difference in the timer values if it is larger than the
currently stored largest value. The difference over and above the
expected difference will give the 'jitter' in the processing of these
interrupts. */
if( usDifference > usMaxJitter )
{
usMaxJitter = usDifference;
}
}
else
{
/* Don't bother storing any values for the first couple of
interrupts. */
usSettleCount++;
}
 
/* Remember what the timer value was this time through, so we can calculate
the difference the next time through. */
usLastCount = usThisCount;
}
/*-----------------------------------------------------------*/
 
void __attribute__((__interrupt__, auto_psv)) _T2Interrupt( void )
{
/* Work out the time between this and the previous interrupt. */
prvCalculateAndStoreJitter();
 
/* Clear the timer interrupt. */
IFS0bits.T2IF = 0;
}
 
 
/timertest.h
0,0 → 1,63
/*
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.
*/
 
#ifndef TIMER_TEST_H
#define TIMER_TEST_H
 
/* Setup the high frequency timer interrupt. */
void vSetupTimerTest( unsigned short usFrequencyHz );
 
#endif /* TIMER_TEST_H */
 
 
 

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