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Allow auto switching between creating tasks in ARM mode and THUMB mode.

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This commit is contained in:
Richard Barry 2009-09-29 20:03:09 +00:00
parent b500ab8be2
commit afaa3321ba
1 changed files with 15 additions and 7 deletions
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22
Source/portable/IAR/LPC2000/port.c
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@ -3,14 +3,14 @@
This file is part of the FreeRTOS distribution. This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under 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 the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation and modified by the FreeRTOS exception. Free Software Foundation and modified by the FreeRTOS exception.
**NOTE** The exception to the GPL is included to allow you to distribute a **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 combined work that includes FreeRTOS without being obliged to provide the
source code for proprietary components outside of the FreeRTOS kernel. source code for proprietary components outside of the FreeRTOS kernel.
Alternative commercial license and support terms are also available upon Alternative commercial license and support terms are also available upon
request. See the licensing section of http://www.FreeRTOS.org for full request. See the licensing section of http://www.FreeRTOS.org for full
license details. license details.
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
@ -72,7 +72,8 @@
#define portRESET_COUNT_ON_MATCH ( ( unsigned portLONG ) 0x02 ) #define portRESET_COUNT_ON_MATCH ( ( unsigned portLONG ) 0x02 )
/* Constants required to setup the initial stack. */ /* Constants required to setup the initial stack. */
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x3f ) /* System mode, THUMB mode, interrupts enabled. */ #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 ) #define portINSTRUCTION_SIZE ( ( portSTACK_TYPE ) 4 )
/* Constants required to setup the PIT. */ /* Constants required to setup the PIT. */
@ -165,6 +166,13 @@ portSTACK_TYPE *pxOriginalTOS;
/* The status register is set for system mode, with interrupts enabled. */ /* The status register is set for system mode, with interrupts enabled. */
*pxTopOfStack = ( portSTACK_TYPE ) portINITIAL_SPSR; *pxTopOfStack = ( portSTACK_TYPE ) portINITIAL_SPSR;
if( ( ( unsigned long ) pxCode & 0x01UL ) != 0x00UL )
{
/* We want the task to start in thumb mode. */
*pxTopOfStack |= portTHUMB_MODE_BIT;
}
pxTopOfStack--; pxTopOfStack--;
/* Interrupt flags cannot always be stored on the stack and will /* Interrupt flags cannot always be stored on the stack and will