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FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
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.
Alternative commercial license and support terms are also available upon
request. See the licensing section of for full
license details.
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.
* *
* Looking for a quick start? Then check out the FreeRTOS eBook! *
* See for details *
* *
1 tab == 4 spaces!
Please ensure to read the configuration and relevant port sections of the
online documentation. - Documentation, latest information, license and
contact details. - A version that is certified for use in safety
critical systems. - Commercial support, development, porting,
licensing and training services.
#include <msp430x44x.h>
Two interrupt examples are provided -
+ Method 1 does everything in C code.
+ Method 2 uses an assembly file wrapper.
Code size:
Method 1 uses assembly macros to save and restore the task context, whereas
method 2 uses functions. This means method 1 will be faster, but method 2 will
use less code space.
Method 1 is very simplistic, whereas method 2 is more elaborate. This
elaboration results in the code space saving, but also requires a slightly more
complex procedure to define interrupt service routines.
Interrupt efficiency:
Method 1 uses the compiler generated function prologue and epilogue code to save
and restore the necessary registers within an interrupt service routine (other
than the RTOS tick ISR). Should a context switch be required from within the ISR
the entire processor context is saved. This can result in some registers being saved
twice - once by the compiler generated code, and then again by the FreeRTOS code.
Method 2 saves and restores all the processor registers within each interrupt service
routine, whether or not a context switch actually occurs. This means no registers
ever get saved twice, but imposes an overhead on the occasions that no context switch
* Application specific definitions.
* These definitions should be adjusted for your particular hardware and
* application requirements.
* See
#define configUSE_PREEMPTION 1
#define configUSE_IDLE_HOOK 1
#define configUSE_TICK_HOOK 0
#define configCPU_CLOCK_HZ ( ( unsigned portLONG ) 7995392 ) /* Clock setup from main.c in the demo application. */
#define configTICK_RATE_HZ ( ( portTickType ) 1000 )
#define configMAX_PRIORITIES ( ( unsigned portBASE_TYPE ) 4 )
#define configMINIMAL_STACK_SIZE ( ( unsigned portSHORT ) 50 )
#define configTOTAL_HEAP_SIZE ( ( size_t ) ( 1700 ) )
#define configMAX_TASK_NAME_LEN ( 8 )
#define configUSE_TRACE_FACILITY 0
#define configUSE_16_BIT_TICKS 1
#define configIDLE_SHOULD_YIELD 1
/* Co-routine definitions. */
#define configUSE_CO_ROUTINES 0
#define configMAX_CO_ROUTINE_PRIORITIES ( 2 )
/* Set the following definitions to 1 to include the API function, or zero
to exclude the API function. */
#define INCLUDE_vTaskPrioritySet 0
#define INCLUDE_uxTaskPriorityGet 0
#define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskCleanUpResources 0
#define INCLUDE_vTaskSuspend 0
#define INCLUDE_vTaskDelayUntil 1
#define INCLUDE_vTaskDelay 1
#define INCLUDE_uxTaskGetStackHighWaterMark 0
#endif /* FREERTOS_CONFIG_H */