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Content on FreeRTOSConfig.h configuration file which in addition to the "universal configuration", other content for beginners configured with a relatively small, relatively little difficult to understand. In order to allow beginners to have a rough idea, we still continue to talk about the content FreeRTOSConfig.h configuration, late applications will be combined with further talk about the content of FreeRTOSConfig.h.
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TIMERS Configuration
Timer TIMER i.e., TIMER belongs in the RTOS software timing. FreeRTOS timer accuracy is not high, it will increase the timing of change, particularly low TIMER task priority, high priority cases take up resources.
To use the high-precision timing, using a hardware timer or the final (generally a plurality of hardware processors now TIMER).
1.configUSE_TIMERS
Whether to use a software timer
Is set to 0: Not used
Configured to 1:
Many other functions are required to use in conjunction with this configuration, you need to pay attention to whether the associated use.
2.configTIMER_TASK_PRIORITY
Software Timer task priority
Software Timer actually need to create a task, and we create the same conventional way, but it is the system kernel is complete, we do not have to write the code to create a task.
The priority here is the priority task of the timer.
3.configTIMER_QUEUE_LENGTH
Software timer command queue length
About TIMER command queue involve relatively complex knowledge point, post further talk, can look:
4.configTIMER_TASK_STACK_DEPTH
Stack space allocated to a software timer
Ⅲ
CO_ROUTINES Configuration
CO_ROUTINES this bad translation, online program called collaborative or cooperative programs, understand the program is used in conjunction with, the latter about the combined application.
1.configUSE_CO_ROUTINES
Whether CO_ROUTINES
Is set to 0: Not used
Configured to 1:
2.configMAX_CO_ROUTINE_PRIORITIES
CO_ROUTINE priority
Ⅳ
MEMORY configuration
Memory allocation related configuration, the configuration where the heap_x.c related back will be told again.
1.configSUPPORT_STATIC_ALLOCATION
Whether to support the static allocation
Is set to 0: not supported
Configuration 1: Support
2.configSUPPORT_DYNAMIC_ALLOCATION
Whether to support dynamic allocation
Is set to 0: not supported
Configuration 1: Support
3.configTOTAL_HEAP_SIZE
Stack assigned to the system
Create a task, stack, static and dynamic memory allocation have come from here.
4.configAPPLICATION_ALLOCATED_HEAP
APP use where the allocated heap
0 is configured to: use the system heap allocation
1 is configured to: use an external allocated heap
Use the system default heap allocation, see definition below:
#if (configAPPLICATION_ALLOCATED_HEAP == 1)
extern uint8_t ucHeap [configTOTAL_HEAP_SIZE];
#else
static uint8_t ucHeap [configTOTAL_HEAP_SIZE];
#ENDIF
Ⅴ
RUN_TIME_STATS Configuration
Run-time configuration information statistics
1.configGENERATE_RUN_TIME_STATS
Whether to generate statistical information
Is set to 0: NO
Configuration 1: Yes
2.configUSE_TRACE_FACILITY
Whether assist in the implementation visualization and tracking
Is set to 0: NO
Configuration 1: Yes
Here we will add additional structure to achieve.
3.configUSE_STATS_FORMATTING_FUNCTIONS
Are statistics related functions
Is set to 0: NO
Configuration 1: Yes
Setting the macro configUSE_TRACE_FACILITY and configUSE_STATS_FORMATTING_FUNCTIONS 1 compiles vTaskList () and vTaskGetRunTimeStats () function. If any one of these two macro is set to 0, the above-described two functions are not compiled.
Ⅵ
Other configurations
Here a simple integrated say something about the configuration
1.configASSERT
Assertion Configuration
2.Interrupt related
configKERNEL_INTERRUPT_PRIORITY: kernel interrupt priority
configMAX_SYSCALL_INTERRUPT_PRIORITY: system calls the biggest priority
configMAX_API_CALL_INTERRUPT_PRIORITY: maximum priority API calls
This section and (Cortex) core hardware interrupt related.
3.INCLUDE Configuration
#define INCLUDE_vTaskPrioritySet 1
#define INCLUDE_uxTaskPriorityGet 1
#define INCLUDE_vTaskDelete 1
Here is well understood, it contains some of the content, it is more common in the UCOS. Read more
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