【急】我在使用信号量的时候遇到了问题，谁可以帮我解...

发布于 2018-01-11 11:47:15 浏览：2201 订阅该版

代码如下：
```static void led0_thread_entry(void *parameter)
{
    uint8_t flag = 1;
	while(1) {
        rt_sem_take(&sem, RT_WAITING_FOREVER);
        if(flag) {
            HAL_GPIO_WritePin(LED0_GPIO_Port, LED0_Pin, GPIO_PIN_SET);
            flag = 0;
           
        }
        else {
            HAL_GPIO_WritePin(LED0_GPIO_Port, LED0_Pin, GPIO_PIN_RESET);
            flag = 1;
        }
        
		
	}
}
static void print_thread_entry(void *parameter){
    uint32_t times = 0;
    while(1) {
        rt_sem_release(&sem);
        rt_kprintf("times = %u<br>", times++);
        rt_thread_delay(500);
    }
}```调试信息：
> thread led0 take sem:sem, which value is: 0
sem take: suspend thread - led0
thread print releases sem:sem, which value is: 0
resume thread:led0
times = 0
thread led0 take sem:sem, which value is: 0
sem take: suspend thread - led0
psr: 0x01000000
r00: 0x20000e58
r01: 0x10000000
r02: 0xf0f00000
r03: 0x00000410
r04: 0x20000ea8
r05: 0x00000001
r06: 0xdeadbeef
r07: 0xdeadbeef
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0xfffffffe
 lr: 0x08003833
 pc: 0x08003832
hard fault on thread: tidle

6 个回答

aozima 2018-01-11

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

z4b4@qq.com 2018-01-11

这家伙很懒，什么也没写！

>代码没贴全，没看到sem初始化，以及你贴出日志的打印部分。
>
>贴出的部分初看没发现问题。 ...

---

```
static rt_thread_t print_tid = RT_NULL;
static struct rt_thread led0_thread;
/* 指向信号量的指针 */
struct rt_semaphore sem;
ALIGN(RT_ALIGN_SIZE)
static uint8_t rt_led0_thread_stack[512];

static void led0_thread_entry(void *parameter)
{
    uint8_t flag = 1;
	while(1) {
        rt_sem_take(&sem, RT_WAITING_FOREVER);
        if(flag) {
            HAL_GPIO_WritePin(LED0_GPIO_Port, LED0_Pin, GPIO_PIN_SET);
            flag = 0;
           
        }
        else {
            HAL_GPIO_WritePin(LED0_GPIO_Port, LED0_Pin, GPIO_PIN_RESET);
            flag = 1;
        }
        
		
	}
}
static void print_thread_entry(void *parameter){
    uint32_t times = 0;
    while(1) {
        rt_sem_release(&sem);
        rt_kprintf("times = %u\n", times++);
        rt_thread_delay(500);
    }
}
int main(void)
{
    rt_sem_init(&sem , "sem", 0, RT_IPC_FLAG_FIFO);
  
    rt_thread_init(&led0_thread,               	  
                   "led0",                     	 
                   led0_thread_entry,          	 
                   RT_NULL,                    	  
                   &rt_led0_thread_stack[0],      
                   sizeof(rt_led0_thread_stack), 
                   2,                          	  
                   20);
    
    print_tid = rt_thread_create("print", 
                     print_thread_entry,
                     RT_NULL, 
                     512,
                     1,
                     20);
    rt_thread_startup(&led0_thread);
    rt_thread_startup(print_tid);
}
```

z4b4@qq.com 2018-01-11

这家伙很懒，什么也没写！

---

>\ | /
>- RT -     Thread Operating System
> / | \     2.1.0 build Jan 11 2018
> 2006 - 2017 Copyright by rt-thread team
>thread (NULL) take sem:heap, which value is: 1
>thread heap releases sem:heap, which value is: 0
>thread heap take sem:heap, which value is: 1
>thread heap releases sem:heap, which value is: 0
>thread main take sem:heap, which value is: 1
>thread main releases sem:heap, which value is: 0
>thread main take sem:heap, which value is: 1
>thread main releases sem:heap, which value is: 0
>thread led0 take sem:sem, which value is: 0
>sem take: suspend thread - led0
>thread print releases sem:sem, which value is: 0
>resume thread:led0
>times = 0
>thread led0 take sem:sem, which value is: 0
>sem take: suspend thread - led0
>psr: 0x01000000
>r00: 0x20000e58
>r01: 0x10000000
>r02: 0xf0f00000
>r03: 0x00000410
>r04: 0x20000ea8
>r05: 0x00000001
>r06: 0xdeadbeef
>r07: 0xdeadbeef
>r08: 0xdeadbeef
>r09: 0xdeadbeef
>r10: 0xdeadbeef
>r11: 0xdeadbeef
>r12: 0xfffffffe
> lr: 0x08003833
> pc: 0x08003832
>hard fault on thread: tidle

---