该移植过程中应用的 Firmware 分别为 MM32F3270 库函数和例程，下载地址：

具体的商用使用条件参考Azure的许可证说明：

该章节介绍信号量的相关知识，演示程序可在MM32F3273G9P的EVB-F3270上运行。

此示例在文件 main_semaphore_demo.c 中实现，旨在说明如何在嵌入式多线程环境中使用信号量，实现任务之间的同步和资源共享机制。

UINTtx_semaphore_create(
TX_SEMAPHORE*semaphore_ptr,
CHAR*name_ptr,
ULONGinitial_count);

示例

TX_SEMAPHOREmy_semaphore;
UINTstatus;

/*Createacountingsemaphorewhoseinitialvalueis1.
Thisistypicallythetechniqueusedtomakeabinary
semaphore.Binarysemaphoresareusedtoprovide
protectionoveracommonresource.*/
status=tx_semaphore_create(my_semaphore,
"my_semaphore_name",1);

/*IfstatusequalsTX_SUCCESS,my_semaphoreisreadyfor
use.*/

https://docs.microsoft.com/en-us/azure/rtos/threadx/threadx-smp/chapter4

注意：

需要在delay.c中配置USE_SYSTICK_DELAY 为 0。

#define USE_SYSTICK_DELAY 0

/*Thisisasmalldemoofthehigh-performanceThreadXkernel.Itincludesexamplesofsix
threadsofdifferentpriorities,usingamessagequeue,semaphore,andaneventflagsgroup.*/

#include"tx_api.h"
#include"delay.h"
#include"led.h"
#include"key.h"
#include"uart.h"


#defineDEMO_STACK_SIZE1024

#defineTHREAD0_PRIORITY1
#defineTHREAD0_PREEMPTION_THRESHOLD1
#defineTHREAD1_PRIORITY2
#defineTHREAD1_PREEMPTION_THRESHOLD2

#defineTHREAD5_PRIORITY4
#defineTHREAD5_PREEMPTION_THRESHOLD4



//#defineTHREAD5_PREEMPTION_THRESHOLD_NEW0


/*DefinetheThreadXobjectcontrolblocks...*/
TX_THREADthread_0;
TX_THREADthread_1;

TX_THREADthread_5;

TX_SEMAPHORESemaphore;

/*Definethecountersusedinthedemoapplication...*/
ULONGthread_0_counter;
ULONGthread_1_counter;

ULONGthread_5_counter;


/*Definethethreadstacks.*/
UCHARthread_0_stack[DEMO_STACK_SIZE];
UCHARthread_1_stack[DEMO_STACK_SIZE];

UCHARthread_5_stack[DEMO_STACK_SIZE];

/*Definethreadprototypes.*/

voidthread_0_entry(ULONGthread_input);
voidthread_1_entry(ULONGthread_input);

voidthread_5_entry(ULONGthread_input);


volatileunsignedintbootloop;

/*Definemainentrypoint.*/



intmain()
{
DELAY_Init();//cannotusesystick
LED_Init();
KEY_Init();
CONSOLE_Init(115200);
printf("!!!Start!!!\r\n");

/*EntertheThreadXkernel.*/
tx_kernel_enter();
}


/*Definewhattheinitialsystemlookslike.*/

voidtx_application_define(void*first_unused_memory)
{
/*Createthread0.*/
tx_thread_create(
thread_0,
"thread0",
thread_0_entry,
0,
thread_0_stack,
DEMO_STACK_SIZE,
THREAD0_PRIORITY,
THREAD0_PREEMPTION_THRESHOLD,
TX_NO_TIME_SLICE,
TX_AUTO_START);

/*Createthread1.*/
tx_thread_create(
thread_1,
"thread1",
thread_1_entry,
0,
thread_1_stack,
DEMO_STACK_SIZE,
THREAD1_PRIORITY,
THREAD1_PREEMPTION_THRESHOLD,
TX_NO_TIME_SLICE,
TX_AUTO_START);


/*Createthread5.*/
tx_thread_create(
thread_5,
"thread5",
thread_5_entry,
5,
thread_5_stack,
DEMO_STACK_SIZE,
THREAD5_PRIORITY,
THREAD5_PREEMPTION_THRESHOLD,
TX_NO_TIME_SLICE,
TX_AUTO_START);

/*Createasemaphoreforsignalsynchronization*/
tx_semaphore_create(Semaphore,"Semaphore",0);

}


/*Definethetestthreads.*/

voidthread_0_entry(ULONGthread_input)
{
/*ThisthreadsimplycontrolsLEDflashingtoindicatethatthesystemisrunning*/
while(1)
{
/*Incrementthethreadcounter.*/
thread_0_counter++;

LED1_TOGGLE();

/*Sleepfor200ticks.*/
tx_thread_sleep(200);

}
}

voidthread_1_entry(ULONGthread_input)
{
UINTstatus;
/*Thisthreadsimplysuccessfullyreceivesthesemaphoreandstartstoprintinformation*/
while(1)
{
/*Incrementthethreadcounter.*/
thread_1_counter++;
status=tx_semaphore_get(Semaphore,TX_WAIT_FOREVER);
if(status==TX_SUCCESS)
{
/*Receivethesemaphore*/
printf("Synchronizationsemaphorereceived\r\n");
}
}
}


voidthread_5_entry(ULONGthread_input)
{
UCHARt=0;
/*Thisthreadsimplyscanbuttonispressedtosendthesemaphore.*/
while(1)
{
/*Incrementthethreadcounter.*/
thread_5_counter++;

t=KEY_Scan(0);
if(KEY1_PRES==t)
{
LED1_TOGGLE();
}
elseif(KEY2_PRES==t){
LED2_TOGGLE();
/*K2ispressedtosendasemaphore*/
tx_semaphore_put(Semaphore);
}
elseif(KEY3_PRES==t){
LED3_TOGGLE();
}
elseif(KEY4_PRES==t){
LED4_TOGGLE();
}
else{
tx_thread_sleep(10);
}
}
}