mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-09-01 20:03:50 -04:00
First version under SVN is V4.0.1
This commit is contained in:
Richard Barry
parent
243393860c
commit
b6df57c7e3
918 changed files with 269038 additions and 0 deletions
250
Source/portable/IAR/STR71x/port.c
Normal file
250
Source/portable/IAR/STR71x/port.c
Normal file
|
|
@ -0,0 +1,250 @@
|
|||
/*
|
||||
FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
|
||||
|
||||
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 as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
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
|
||||
along with FreeRTOS; 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, 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.
|
||||
***************************************************************************
|
||||
*/
|
||||
|
||||
/*-----------------------------------------------------------
|
||||
* Implementation of functions defined in portable.h for the ST STR71x ARM7
|
||||
* port.
|
||||
*----------------------------------------------------------*/
|
||||
|
||||
/* Library includes. */
|
||||
#include "wdg.h"
|
||||
#include "eic.h"
|
||||
|
||||
/* Standard includes. */
|
||||
#include <stdlib.h>
|
||||
|
||||
/* Scheduler includes. */
|
||||
#include "FreeRTOS.h"
|
||||
#include "task.h"
|
||||
|
||||
/* Constants required to setup the initial stack. */
|
||||
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x3f ) /* System mode, THUMB mode, interrupts enabled. */
|
||||
#define portINSTRUCTION_SIZE ( ( portSTACK_TYPE ) 4 )
|
||||
|
||||
/* Constants required to handle critical sections. */
|
||||
#define portNO_CRITICAL_NESTING ( ( unsigned portLONG ) 0 )
|
||||
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Setup the watchdog to generate the tick interrupts. */
|
||||
static void prvSetupTimerInterrupt( void );
|
||||
|
||||
/* ulCriticalNesting will get set to zero when the first task starts. It
|
||||
cannot be initialised to 0 as this will cause interrupts to be enabled
|
||||
during the kernel initialisation process. */
|
||||
unsigned portLONG ulCriticalNesting = ( unsigned portLONG ) 9999;
|
||||
|
||||
/* Tick interrupt routines for cooperative and preemptive operation
|
||||
respectively. The preemptive version is not defined as __irq as it is called
|
||||
from an asm wrapper function. */
|
||||
__arm __irq void vPortNonPreemptiveTick( void );
|
||||
void vPortPreemptiveTick( void );
|
||||
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/*
|
||||
* Initialise the stack of a task to look exactly as if a call to
|
||||
* portSAVE_CONTEXT had been called.
|
||||
*
|
||||
* See header file for description.
|
||||
*/
|
||||
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
|
||||
{
|
||||
portSTACK_TYPE *pxOriginalTOS;
|
||||
|
||||
pxOriginalTOS = pxTopOfStack;
|
||||
|
||||
/* Setup the initial stack of the task. The stack is set exactly as
|
||||
expected by the portRESTORE_CONTEXT() macro. */
|
||||
|
||||
/* First on the stack is the return address - which in this case is the
|
||||
start of the task. The offset is added to make the return address appear
|
||||
as it would within an IRQ ISR. */
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) pxCode + portINSTRUCTION_SIZE;
|
||||
pxTopOfStack--;
|
||||
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0xaaaaaaaa; /* R14 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) pxOriginalTOS; /* Stack used when task starts goes in R13. */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x12121212; /* R12 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x11111111; /* R11 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x10101010; /* R10 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x09090909; /* R9 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x08080808; /* R8 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x07070707; /* R7 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x06060606; /* R6 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x05050505; /* R5 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x04040404; /* R4 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x03030303; /* R3 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x02020202; /* R2 */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) 0x01010101; /* R1 */
|
||||
pxTopOfStack--;
|
||||
|
||||
/* When the task starts is will expect to find the function parameter in
|
||||
R0. */
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
|
||||
pxTopOfStack--;
|
||||
|
||||
/* The status register is set for system mode, with interrupts enabled. */
|
||||
*pxTopOfStack = ( portSTACK_TYPE ) portINITIAL_SPSR;
|
||||
pxTopOfStack--;
|
||||
|
||||
/* Interrupt flags cannot always be stored on the stack and will
|
||||
instead be stored in a variable, which is then saved as part of the
|
||||
tasks context. */
|
||||
*pxTopOfStack = portNO_CRITICAL_NESTING;
|
||||
|
||||
return pxTopOfStack;
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
portBASE_TYPE xPortStartScheduler( void )
|
||||
{
|
||||
extern void vPortStartFirstTask( void );
|
||||
|
||||
/* Start the timer that generates the tick ISR. Interrupts are disabled
|
||||
here already. */
|
||||
prvSetupTimerInterrupt();
|
||||
|
||||
/* Start the first task. */
|
||||
vPortStartFirstTask();
|
||||
|
||||
/* Should not get here! */
|
||||
return 0;
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
void vPortEndScheduler( void )
|
||||
{
|
||||
/* It is unlikely that the ARM port will require this function as there
|
||||
is nothing to return to. */
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* The cooperative scheduler requires a normal IRQ service routine to
|
||||
simply increment the system tick. */
|
||||
__arm __irq void vPortNonPreemptiveTick( void )
|
||||
{
|
||||
/* Increment the tick count - which may wake some tasks but as the
|
||||
preemptive scheduler is not being used any woken task is not given
|
||||
processor time no matter what its priority. */
|
||||
vTaskIncrementTick();
|
||||
|
||||
/* Clear the interrupt in the watchdog and EIC. */
|
||||
WDG->SR = 0x0000;
|
||||
portCLEAR_EIC();
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* This function is called from an asm wrapper, so does not require the __irq
|
||||
keyword. */
|
||||
void vPortPreemptiveTick( void )
|
||||
{
|
||||
/* Increment the tick counter. */
|
||||
vTaskIncrementTick();
|
||||
|
||||
/* The new tick value might unblock a task. Ensure the highest task that
|
||||
is ready to execute is the task that will execute when the tick ISR
|
||||
exits. */
|
||||
vTaskSwitchContext();
|
||||
|
||||
/* Clear the interrupt in the watchdog and EIC. */
|
||||
WDG->SR = 0x0000;
|
||||
portCLEAR_EIC();
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void prvSetupTimerInterrupt( void )
|
||||
{
|
||||
/* Set the watchdog up to generate a periodic tick. */
|
||||
WDG_ECITConfig( DISABLE );
|
||||
WDG_CntOnOffConfig( DISABLE );
|
||||
WDG_PeriodValueConfig( configTICK_RATE_HZ );
|
||||
|
||||
/* Setup the tick interrupt in the EIC. */
|
||||
EIC_IRQChannelPriorityConfig( WDG_IRQChannel, 1 );
|
||||
EIC_IRQChannelConfig( WDG_IRQChannel, ENABLE );
|
||||
EIC_IRQConfig( ENABLE );
|
||||
WDG_ECITConfig( ENABLE );
|
||||
|
||||
/* Start the timer - interrupts are actually disabled at this point so
|
||||
it is safe to do this here. */
|
||||
WDG_CntOnOffConfig( ENABLE );
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
__arm __interwork void vPortEnterCritical( void )
|
||||
{
|
||||
/* Disable interrupts first! */
|
||||
__disable_interrupt();
|
||||
|
||||
/* Now interrupts are disabled ulCriticalNesting can be accessed
|
||||
directly. Increment ulCriticalNesting to keep a count of how many times
|
||||
portENTER_CRITICAL() has been called. */
|
||||
ulCriticalNesting++;
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
__arm __interwork void vPortExitCritical( void )
|
||||
{
|
||||
if( ulCriticalNesting > portNO_CRITICAL_NESTING )
|
||||
{
|
||||
/* Decrement the nesting count as we are leaving a critical section. */
|
||||
ulCriticalNesting--;
|
||||
|
||||
/* If the nesting level has reached zero then interrupts should be
|
||||
re-enabled. */
|
||||
if( ulCriticalNesting == portNO_CRITICAL_NESTING )
|
||||
{
|
||||
__enable_interrupt();
|
||||
}
|
||||
}
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue