Freeertos is highly configurable. All configurable items are in the freertosconfig.h file. Each DEMO program contains a configured Freertosconfig.h file, which can be modified on the basis of the Freertosconfig.h file in the DEMO program.
Let's give a typical freertosconfig.h file before it will be explained item by item.
#ifndef freertos_config_h
#define freertos_config_h
/ * Here Is a Good Place to include header files That Are Required Across
Your application. * /
#include "something"
#define configuse_preeemption 1
#define configuse_idle_hook 0
#define configuse_tic_hook 0
#define configcpu_clock_hz 58982400
#define configTick_Rate_Hz 250
#define configmax_priorities 5
#define configminimal_stack_size 128
#define configtotal_heap_size 10240
#define configmax_task_name_len 16
#define configuse_trace_facility 0
#define configuse_16_bit_ticks 0
#define configidle_should_yield 1
#define configuse_mutexes 0
#define configuse_recursive_mutexes 0
#define configuse_counting_semaphores 0
#define configuse_alternative_api 0
#define configCheck_for_stack_overflow 0
#define configQueue_registry_size 10
#define configgenerate_run_time_stats 0
#define configuse_co_routines 0
#define configmax_co_routine_priorities 1
#define configuse_timers 1
#define configtimer_task_priority 3
#define configTimer_Queue_Length 10
#define configtimer_task_stack_depth configminimal_stack_size
#define configkernel_interrupt_priority [dependent of processor]
#define configmax_syscall_interrupt_priority [dependent on processor and application]
#define configassert ((x)) i ((x) == 0) vcallassert (__file__, __line__)
#define incrude_vtaskpriorityset 1
#define include_uxtaskpriorityget 1
#define incrude_vtaskdelete 1
#define incrude_vtaskspend 1
#define include_xResumeFromisr 1
#define include_vtaskdeLayuntil 1
#define incrude_vtaskdelay 1
#define include_XtaskgetsChedulerstate 1
#define include_XtaskgetCurrentTaskHandle 1
#define include_uxtaskgetstackhonghwatermark 0
#define include_XtaskgetIdletaskHandle 0
#define include_xtimergettimerdaemontaskhandle 0
#define incdude_pctaskgettaskname 0
#ENDIF / * Freeertos_config_h * /
Configurable parameters
Configuse_Pree Mption
Set to 1 The preemptive scheduler is set to 0, the collaborative scheduler is used.
CONFIGUSE_IDLE_HOOK
Set to 1 Enable iDLE Hook, set to 0, iDLE HOOK.
Configuse_tick_hook
Set to 1 Enable Tick Hook, set to 0 Tick Hook.
CONFIGCPU_CLOCK_HZ
The operating frequency of the MCU kernel is set to Hz. It is used when configuring the clock Tick of Freertos. This parameter may not be used for different graft code. If you do not need to use it in the graft code, you can comment out.
ConfigTick_Rate_Hz
The frequency of Freertos's clock Tick is also a frequency of time interrupts used in Freertos. The higher the frequency, the higher the accuracy of the timing, but the greater the overhead brought. The Demo program comes with the DETOS comes with 1000 Hz is only used to test the performance of the kernel. The actual application should be changed to a smaller value as needed.
When multiple tasks share a priority, the kernel scheduler comes back to the rear wheel transfusion task per clock, so higher Tick Rate will result in the task time slice "Time Slice" as short.
Configmax_Priorities
The maximum priority can be used in the program. Freeertos will create a linked list for each priority, so there is no more priorities to increase some RAM overhead. Therefore, to set this parameter according to how many different priorities need in the program.
Configminimal_stack_size
The minimum size of the task stack, FreertOS to assign the stack space for the IDLE Task based on this parameter. This value will cause the program to hang if the set is small than the actual space. Therefore, it is best not to reduce the size given in the DEMO program.
Configtotal_heap_size
Set the size of the heap space (HEAP). It will only be used when the memory allocation algorithm is supplied in the program.
Configmax_task_name_len
The maximum length of the task name, this length is in bytes, and includes the last NULL end byte.
Configuse_trace_facility
This macro is required if you need to use the TRACE function in the program. Otherwise it is set to 0. After turning on the trace function, the RAM occupies a lot, so think twice before setting to 1.
CONFIGUSE_16_BIT_TICKS
Setting configuse_16_bit_ticks to 1 PostTickType will be defined as a non-symbolic 16-bit shaping type, and configUSE_16_bit_ticks is set to 0 PortTickType is defined as unsigned 32-bit integer.
Configidle_Shold_yield
This parameter controls the behavior of the same task as the IDLE task, and only when the kernel is configured to seize the task scheduling, there is practical role.
The kernel will use the task of the same priority using a time slice rotation adjustment algorithm. When the priority of the task is higher than the IDLE task, the time slice of each task is equally sized. Technology area
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