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.
209 lines
6.9 KiB
C
209 lines
6.9 KiB
C
/*
|
|
FreeRTOS.org V4.7.2 - Copyright (C) 2003-2008 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.
|
|
|
|
***************************************************************************
|
|
|
|
Please ensure to read the configuration and relevant port sections of the
|
|
online documentation.
|
|
|
|
+++ 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.
|
|
|
|
***************************************************************************
|
|
*/
|
|
|
|
/*-----------------------------------------------------------
|
|
* Implementation of functions defined in portable.h for the ST STR75x ARM7
|
|
* port.
|
|
*----------------------------------------------------------*/
|
|
|
|
/* Library includes. */
|
|
#include "75x_tb.h"
|
|
#include "75x_eic.h"
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
#include "task.h"
|
|
|
|
/* Constants required to setup the initial stack. */
|
|
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x1f ) /* System mode, ARM mode, interrupts enabled. */
|
|
#define portTHUMB_MODE_BIT ( ( portSTACK_TYPE ) 0x20 )
|
|
#define portINSTRUCTION_SIZE ( ( portSTACK_TYPE ) 4 )
|
|
|
|
/* Constants required to handle critical sections. */
|
|
#define portNO_CRITICAL_NESTING ( ( unsigned portLONG ) 0 )
|
|
|
|
/* Prescale used on the timer clock when calculating the tick period. */
|
|
#define portPRESCALE 20
|
|
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Setup the TB to generate the tick interrupts. */
|
|
static void prvSetupTimerInterrupt( 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;
|
|
|
|
#ifdef THUMB_INTERWORK
|
|
{
|
|
/* We want the task to start in thumb mode. */
|
|
*pxTopOfStack |= portTHUMB_MODE_BIT;
|
|
}
|
|
#endif
|
|
|
|
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 vPortISRStartFirstTask( void );
|
|
|
|
/* Start the timer that generates the tick ISR. Interrupts are disabled
|
|
here already. */
|
|
prvSetupTimerInterrupt();
|
|
|
|
/* Start the first task. */
|
|
vPortISRStartFirstTask();
|
|
|
|
/* 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. */
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvSetupTimerInterrupt( void )
|
|
{
|
|
EIC_IRQInitTypeDef EIC_IRQInitStructure;
|
|
TB_InitTypeDef TB_InitStructure;
|
|
|
|
/* Setup the EIC for the TB. */
|
|
EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
|
|
EIC_IRQInitStructure.EIC_IRQChannel = TB_IRQChannel;
|
|
EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
|
|
EIC_IRQInit(&EIC_IRQInitStructure);
|
|
|
|
/* Setup the TB for the generation of the tick interrupt. */
|
|
TB_InitStructure.TB_Mode = TB_Mode_Timing;
|
|
TB_InitStructure.TB_CounterMode = TB_CounterMode_Down;
|
|
TB_InitStructure.TB_Prescaler = portPRESCALE;
|
|
TB_InitStructure.TB_AutoReload = ( ( configCPU_CLOCK_HZ / ( portPRESCALE + 1 ) ) / configTICK_RATE_HZ ) + 1;
|
|
TB_Init(&TB_InitStructure);
|
|
|
|
/* Enable TB Update interrupt */
|
|
TB_ITConfig(TB_IT_Update, ENABLE);
|
|
|
|
/* Clear TB Update interrupt pending bit */
|
|
TB_ClearITPendingBit(TB_IT_Update);
|
|
|
|
/* Enable TB */
|
|
TB_Cmd(ENABLE);
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|