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FreeRTOS/Source/portable/MSVC-MingW/port.c Normal file
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/*
FreeRTOS V7.1.1 - 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!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include <stdio.h>
#define portMAX_INTERRUPTS ( ( unsigned long ) sizeof( unsigned long ) * 8UL ) /* The number of bits in an unsigned long. */
#define portNO_CRITICAL_NESTING ( ( unsigned long ) 0 )
/*
* Created as a high priority thread, this function uses a timer to simulate
* a tick interrupt being generated on an embedded target. In this Windows
* environment the timer does not achieve anything approaching real time
* performance though.
*/
static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter );
/*
* Process all the simulated interrupts - each represented by a bit in
* ulPendingInterrupts variable.
*/
static void prvProcessSimulatedInterrupts( void );
/*
* Interrupt handlers used by the kernel itself. These are executed from the
* simulated interrupt handler thread.
*/
static unsigned long prvProcessYieldInterrupt( void );
static unsigned long prvProcessTickInterrupt( void );
/*-----------------------------------------------------------*/
/* The WIN32 simulator runs each task in a thread. The context switching is
managed by the threads, so the task stack does not have to be managed directly,
although the task stack is still used to hold an xThreadState structure this is
the only thing it will ever hold. The structure indirectly maps the task handle
to a thread handle. */
typedef struct
{
/* Handle of the thread that executes the task. */
void *pvThread;
} xThreadState;
/* Simulated interrupts waiting to be processed. This is a bit mask where each
bit represents one interrupt, so a maximum of 32 interrupts can be simulated. */
static volatile unsigned long ulPendingInterrupts = 0UL;
/* An event used to inform the simulated interrupt processing thread (a high
priority thread that simulated interrupt processing) that an interrupt is
pending. */
static void *pvInterruptEvent = NULL;
/* Mutex used to protect all the simulated interrupt variables that are accessed
by multiple threads. */
static void *pvInterruptEventMutex = NULL;
/* The critical nesting count for the currently executing task. This is
initialised to a non-zero value so interrupts do not become enabled during
the initialisation phase. As each task has its own critical nesting value
ulCriticalNesting will get set to zero when the first task runs. This
initialisation is probably not critical in this simulated environment as the
simulated interrupt handlers do not get created until the FreeRTOS scheduler is
started anyway. */
static unsigned long ulCriticalNesting = 9999UL;
/* Handlers for all the simulated software interrupts. The first two positions
are used for the Yield and Tick interrupts so are handled slightly differently,
all the other interrupts can be user defined. */
static unsigned long (*ulIsrHandler[ portMAX_INTERRUPTS ])( void ) = { 0 };
/* Pointer to the TCB of the currently executing task. */
extern void *pxCurrentTCB;
/*-----------------------------------------------------------*/
static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter )
{
portTickType xMinimumWindowsBlockTime = ( portTickType ) 20;
/* Just to prevent compiler warnings. */
( void ) lpParameter;
for(;;)
{
/* Wait until the timer expires and we can access the simulated interrupt
variables. *NOTE* this is not a 'real time' way of generating tick
events as the next wake time should be relative to the previous wake
time, not the time that Sleep() is called. It is done this way to
prevent overruns in this very non real time simulated/emulated
environment. */
if( portTICK_RATE_MS < xMinimumWindowsBlockTime )
{
Sleep( xMinimumWindowsBlockTime );
}
else
{
Sleep( portTICK_RATE_MS );
}
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
/* The timer has expired, generate the simulated tick event. */
ulPendingInterrupts |= ( 1 << portINTERRUPT_TICK );
/* The interrupt is now pending - notify the simulated interrupt
handler thread. */
SetEvent( pvInterruptEvent );
/* Give back the mutex so the simulated interrupt handler unblocks
and can access the interrupt handler variables. */
ReleaseMutex( pvInterruptEventMutex );
}
#ifdef __GNUC__
/* Should never reach here - MingW complains if you leave this line out,
MSVC complains if you put it in. */
return 0;
#endif
}
/*-----------------------------------------------------------*/
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
xThreadState *pxThreadState = NULL;
/* In this simulated case a stack is not initialised, but instead a thread
is created that will execute the task being created. The thread handles
the context switching itself. The xThreadState object is placed onto
the stack that was created for the task - so the stack buffer is still
used, just not in the conventional way. It will not be used for anything
other than holding this structure. */
pxThreadState = ( xThreadState * ) ( pxTopOfStack - sizeof( xThreadState ) );
/* Create the thread itself. */
pxThreadState->pvThread = CreateThread( NULL, 0, ( LPTHREAD_START_ROUTINE ) pxCode, pvParameters, CREATE_SUSPENDED, NULL );
SetThreadAffinityMask( pxThreadState->pvThread, 0x01 );
SetThreadPriorityBoost( pxThreadState->pvThread, TRUE );
SetThreadPriority( pxThreadState->pvThread, THREAD_PRIORITY_IDLE );
return ( portSTACK_TYPE * ) pxThreadState;
}
/*-----------------------------------------------------------*/
portBASE_TYPE xPortStartScheduler( void )
{
void *pvHandle;
long lSuccess = pdPASS;
xThreadState *pxThreadState;
/* Install the interrupt handlers used by the scheduler itself. */
vPortSetInterruptHandler( portINTERRUPT_YIELD, prvProcessYieldInterrupt );
vPortSetInterruptHandler( portINTERRUPT_TICK, prvProcessTickInterrupt );
/* Create the events and mutexes that are used to synchronise all the
threads. */
pvInterruptEventMutex = CreateMutex( NULL, FALSE, NULL );
pvInterruptEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
if( ( pvInterruptEventMutex == NULL ) || ( pvInterruptEvent == NULL ) )
{
lSuccess = pdFAIL;
}
/* Set the priority of this thread such that it is above the priority of
the threads that run tasks. This higher priority is required to ensure
simulated interrupts take priority over tasks. */
pvHandle = GetCurrentThread();
if( pvHandle == NULL )
{
lSuccess = pdFAIL;
}
if( lSuccess == pdPASS )
{
if( SetThreadPriority( pvHandle, THREAD_PRIORITY_NORMAL ) == 0 )
{
lSuccess = pdFAIL;
}
SetThreadPriorityBoost( pvHandle, TRUE );
SetThreadAffinityMask( pvHandle, 0x01 );
}
if( lSuccess == pdPASS )
{
/* Start the thread that simulates the timer peripheral to generate
tick interrupts. The priority is set below that of the simulated
interrupt handler so the interrupt event mutex is used for the
handshake / overrun protection. */
pvHandle = CreateThread( NULL, 0, prvSimulatedPeripheralTimer, NULL, 0, NULL );
if( pvHandle != NULL )
{
SetThreadPriority( pvHandle, THREAD_PRIORITY_BELOW_NORMAL );
SetThreadPriorityBoost( pvHandle, TRUE );
SetThreadAffinityMask( pvHandle, 0x01 );
}
/* Start the highest priority task by obtaining its associated thread
state structure, in which is stored the thread handle. */
pxThreadState = ( xThreadState * ) *( ( unsigned long * ) pxCurrentTCB );
ulCriticalNesting = portNO_CRITICAL_NESTING;
/* Bump up the priority of the thread that is going to run, in the
hope that this will asist in getting the Windows thread scheduler to
behave as an embedded engineer might expect. */
ResumeThread( pxThreadState->pvThread );
/* Handle all simulated interrupts - including yield requests and
simulated ticks. */
prvProcessSimulatedInterrupts();
}
/* Would not expect to return from prvProcessSimulatedInterrupts(), so should
not get here. */
return 0;
}
/*-----------------------------------------------------------*/
static unsigned long prvProcessYieldInterrupt( void )
{
return pdTRUE;
}
/*-----------------------------------------------------------*/
static unsigned long prvProcessTickInterrupt( void )
{
unsigned long ulSwitchRequired;
/* Process the tick itself. */
vTaskIncrementTick();
#if( configUSE_PREEMPTION != 0 )
{
/* A context switch is only automatically performed from the tick
interrupt if the pre-emptive scheduler is being used. */
ulSwitchRequired = pdTRUE;
}
#else
{
ulSwitchRequired = pdFALSE;
}
#endif
return ulSwitchRequired;
}
/*-----------------------------------------------------------*/
static void prvProcessSimulatedInterrupts( void )
{
unsigned long ulSwitchRequired, i;
xThreadState *pxThreadState;
void *pvObjectList[ 2 ];
/* Going to block on the mutex that ensured exclusive access to the simulated
interrupt objects, and the event that signals that a simulated interrupt
should be processed. */
pvObjectList[ 0 ] = pvInterruptEventMutex;
pvObjectList[ 1 ] = pvInterruptEvent;
for(;;)
{
WaitForMultipleObjects( sizeof( pvObjectList ) / sizeof( void * ), pvObjectList, TRUE, INFINITE );
/* Used to indicate whether the simulated interrupt processing has
necessitated a context switch to another task/thread. */
ulSwitchRequired = pdFALSE;
/* For each interrupt we are interested in processing, each of which is
represented by a bit in the 32bit ulPendingInterrupts variable. */
for( i = 0; i < portMAX_INTERRUPTS; i++ )
{
/* Is the simulated interrupt pending? */
if( ulPendingInterrupts & ( 1UL << i ) )
{
/* Is a handler installed? */
if( ulIsrHandler[ i ] != NULL )
{
/* Run the actual handler. */
if( ulIsrHandler[ i ]() != pdFALSE )
{
ulSwitchRequired |= ( 1 << i );
}
}
/* Clear the interrupt pending bit. */
ulPendingInterrupts &= ~( 1UL << i );
}
}
if( ulSwitchRequired != pdFALSE )
{
void *pvOldCurrentTCB;
pvOldCurrentTCB = pxCurrentTCB;
/* Select the next task to run. */
vTaskSwitchContext();
/* If the task selected to enter the running state is not the task
that is already in the running state. */
if( pvOldCurrentTCB != pxCurrentTCB )
{
/* Suspend the old thread. */
pxThreadState = ( xThreadState *) *( ( unsigned long * ) pvOldCurrentTCB );
SuspendThread( pxThreadState->pvThread );
/* Obtain the state of the task now selected to enter the
Running state. */
pxThreadState = ( xThreadState * ) ( *( unsigned long *) pxCurrentTCB );
ResumeThread( pxThreadState->pvThread );
}
}
ReleaseMutex( pvInterruptEventMutex );
}
}
/*-----------------------------------------------------------*/
void vPortDeleteThread( void *pvTaskToDelete )
{
xThreadState *pxThreadState;
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
/* Find the handle of the thread being deleted. */
pxThreadState = ( xThreadState * ) ( *( unsigned long *) pvTaskToDelete );
TerminateThread( pxThreadState->pvThread, 0 );
ReleaseMutex( pvInterruptEventMutex );
}
/*-----------------------------------------------------------*/
void vPortEndScheduler( void )
{
/* This function IS NOT TESTED! */
TerminateProcess( GetCurrentProcess(), 0 );
}
/*-----------------------------------------------------------*/
void vPortGenerateSimulatedInterrupt( unsigned long ulInterruptNumber )
{
xThreadState *pxThreadState;
if( ( ulInterruptNumber < portMAX_INTERRUPTS ) && ( pvInterruptEventMutex != NULL ) )
{
/* Yield interrupts are processed even when critical nesting is non-zero. */
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
ulPendingInterrupts |= ( 1 << ulInterruptNumber );
/* The simulated interrupt is now held pending, but don't actually process it
yet if this call is within a critical section. It is possible for this to
be in a critical section as calls to wait for mutexes are accumulative. */
if( ulCriticalNesting == 0 )
{
/* The event handler needs to know to signal the interrupt acknowledge event
the next time this task runs. */
pxThreadState = ( xThreadState * ) *( ( unsigned long * ) pxCurrentTCB );
SetEvent( pvInterruptEvent );
}
ReleaseMutex( pvInterruptEventMutex );
}
}
/*-----------------------------------------------------------*/
void vPortSetInterruptHandler( unsigned long ulInterruptNumber, unsigned long (*pvHandler)( void ) )
{
if( ulInterruptNumber < portMAX_INTERRUPTS )
{
if( pvInterruptEventMutex != NULL )
{
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
ulIsrHandler[ ulInterruptNumber ] = pvHandler;
ReleaseMutex( pvInterruptEventMutex );
}
else
{
ulIsrHandler[ ulInterruptNumber ] = pvHandler;
}
}
}
/*-----------------------------------------------------------*/
void vPortEnterCritical( void )
{
if( xTaskGetSchedulerState() != taskSCHEDULER_NOT_STARTED )
{
/* The interrupt event mutex is held for the entire critical section,
effectively disabling (simulated) interrupts. */
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
ulCriticalNesting++;
}
else
{
ulCriticalNesting++;
}
}
/*-----------------------------------------------------------*/
void vPortExitCritical( void )
{
xThreadState *pxThreadState;
long lMutexNeedsReleasing;
/* The interrupt event mutex should already be held by this thread as it was
obtained on entry to the critical section. */
lMutexNeedsReleasing = pdTRUE;
if( ulCriticalNesting > portNO_CRITICAL_NESTING )
{
if( ulCriticalNesting == ( portNO_CRITICAL_NESTING + 1 ) )
{
ulCriticalNesting--;
/* Were any interrupts set to pending while interrupts were
(simulated) disabled? */
if( ulPendingInterrupts != 0UL )
{
SetEvent( pvInterruptEvent );
/* The event handler needs to know to signal the interrupt
acknowledge event the next time this task runs. */
pxThreadState = ( xThreadState * ) *( ( unsigned long * ) pxCurrentTCB );
/* Mutex will be released now, so does not require releasing
on function exit. */
lMutexNeedsReleasing = pdFALSE;
ReleaseMutex( pvInterruptEventMutex );
}
}
else
{
/* Tick interrupts will still not be processed as the critical
nesting depth will not be zero. */
ulCriticalNesting--;
}
}
if( lMutexNeedsReleasing == pdTRUE )
{
ReleaseMutex( pvInterruptEventMutex );
}
}
/*-----------------------------------------------------------*/

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FreeRTOS/Source/portable/MSVC-MingW/portmacro.h Normal file
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/*
FreeRTOS V7.1.1 - 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!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
#include <Windows.h>
/******************************************************************************
Defines
******************************************************************************/
/* Type definitions. */
#define portCHAR char
#define portFLOAT float
#define portDOUBLE double
#define portLONG long
#define portSHORT short
#define portSTACK_TYPE unsigned portLONG
#define portBASE_TYPE portLONG
#if( configUSE_16_BIT_TICKS == 1 )
typedef unsigned portSHORT portTickType;
#define portMAX_DELAY ( portTickType ) 0xffff
#else
typedef unsigned portLONG portTickType;
#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/* Hardware specifics. */
#define portSTACK_GROWTH ( -1 )
#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
#define portBYTE_ALIGNMENT 4
#define portYIELD() vPortGenerateSimulatedInterrupt( portINTERRUPT_YIELD )
void vPortDeleteThread( void *pvThreadToDelete );
#define portCLEAN_UP_TCB( pxTCB ) vPortDeleteThread( pxTCB )
#define portDISABLE_INTERRUPTS()
#define portENABLE_INTERRUPTS()
/* Critical section handling. */
void vPortEnterCritical( void );
void vPortExitCritical( void );
#define portENTER_CRITICAL() vPortEnterCritical()
#define portEXIT_CRITICAL() vPortExitCritical()
/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void * pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void * pvParameters )
#define portINTERRUPT_YIELD ( 0UL )
#define portINTERRUPT_TICK ( 1UL )
/*
* Raise a simulated interrupt represented by the bit mask in ulInterruptMask.
* Each bit can be used to represent an individual interrupt - with the first
* two bits being used for the Yield and Tick interrupts respectively.
*/
void vPortGenerateSimulatedInterrupt( unsigned long ulInterruptNumber );
/*
* Install an interrupt handler to be called by the simulated interrupt handler
* thread. The interrupt number must be above any used by the kernel itself
* (at the time of writing the kernel was using interrupt numbers 0, 1, and 2
* as defined above). The number must also be lower than 32.
*
* Interrupt handler functions must return a non-zero value if executing the
* handler resulted in a task switch being required.
*/
void vPortSetInterruptHandler( unsigned long ulInterruptNumber, unsigned long (*pvHandler)( void ) );
#endif