BSP制作的时候BSP内出现的语法错误

发布于 2024-03-27 09:40:51 浏览：297 订阅该版

```c
static rt_int8_t stm32_pin_read(rt_device_t dev, rt_base_t pin)
{
    GPIO_TypeDef *gpio_port;
    uint16_t gpio_pin;
    GPIO_PinState state = PIN_LOW;

if (PIN_PORT(pin) < PIN_STPORT_MAX)
    {
        gpio_port = PIN_STPORT(pin);
        gpio_pin = PIN_STPIN(pin);
        state = HAL_GPIO_ReadPin(gpio_port, gpio_pin);
    }

return (state == GPIO_PIN_RESET) ? PIN_LOW : PIN_HIGH;
}
```
自制BSP发现MDK编译有这么一个警告
```
GPIO_PinState state = PIN_LOW;
```
这句话
```
warning:  #188-D: enumerated type mixed with another type
```

```c
static msh_cmd_opt_t *msh_get_cmd_opt(char *opt_str)
{
    struct finsh_syscall *index;
    msh_cmd_opt_t *opt = RT_NULL;
    char *ptr;
    int len;

if ((ptr = strchr(opt_str, ' ')))
    {
        len = ptr - opt_str;
    }
    else
    {
        len = strlen(opt_str);
    }

for (index = _syscall_table_begin;
            index < _syscall_table_end;
            FINSH_NEXT_SYSCALL(index))
    {
        if (strncmp(index->name, opt_str, len) == 0 && index->name[len] == '\0')
        {
            opt = index->opt;
            break;
        }
    }

return opt;
}
```

这个函数的 `if ((ptr = strchr(opt_str, ' ')))`这句话出现

```
#1293-D: assignment in condition
```
这个警告

```c
void msh_opt_auto_complete(char *prefix)
{
    int argc;
    char *opt_str = RT_NULL;
    msh_cmd_opt_t *opt = RT_NULL;

if ((argc = msh_get_argc(prefix, &opt_str)))
    {
        opt = msh_get_cmd_opt(prefix);
    }
    else if (!msh_get_cmd(prefix, strlen(prefix)) && (' ' == prefix[strlen(prefix) - 1]))
    {
        opt = msh_get_cmd_opt(prefix);
    }

if (opt && opt->id)
    {
        switch (argc)
        {
        case 0:
            msh_opt_help(opt);
            break;

case 1:
            msh_opt_complete(opt_str, opt);
            break;

default:
            break;
        }
    }
}
```

这个函数    `if ((argc = msh_get_argc(prefix, &opt_str)))`
出现 `warning:  #1293-D: assignment in condition`警告

```c
int cmd_list(int argc, char **argv)
{
    if (argc == 2)
    {
        switch (MSH_OPT_ID_GET(cmd_list))
        {
        case RT_Object_Class_Thread: list_thread(); break;
        case RT_Object_Class_Timer: list_timer(); break;
#ifdef RT_USING_SEMAPHORE
        case RT_Object_Class_Semaphore: list_sem(); break;
#endif /* RT_USING_SEMAPHORE */
#ifdef RT_USING_EVENT
        case RT_Object_Class_Event: list_event(); break;
#endif /* RT_USING_EVENT */
#ifdef RT_USING_MUTEX
        case RT_Object_Class_Mutex: list_mutex(); break;
#endif /* RT_USING_MUTEX */
#ifdef RT_USING_MAILBOX
        case RT_Object_Class_MailBox: list_mailbox(); break;
#endif  /* RT_USING_MAILBOX */
#ifdef RT_USING_MESSAGEQUEUE
        case RT_Object_Class_MessageQueue: list_msgqueue(); break;
#endif /* RT_USING_MESSAGEQUEUE */
#ifdef RT_USING_MEMHEAP
        case RT_Object_Class_MemHeap: list_memheap(); break;
#endif /* RT_USING_MEMHEAP */
#ifdef RT_USING_MEMPOOL
        case RT_Object_Class_MemPool: list_mempool(); break;
#endif /* RT_USING_MEMPOOL */
#ifdef RT_USING_DEVICE
        case RT_Object_Class_Device: list_device(); break;
#endif /* RT_USING_DEVICE */
#ifdef RT_USING_DFS
        case LIST_DFS_OPT_ID:
        {
            extern int list_fd(void);
            list_fd();
            break;
        }
#endif /* RT_USING_DFS */
        default:
            goto _usage;
            break;
        };

return 0;
        }

_usage:
    rt_kprintf("Usage: list [options]\n");
    rt_kprintf("[options]:\n");
    MSH_OPT_DUMP(cmd_list);
    return 0;
}
```

这个函数
```
default:
            goto _usage;
            break;
			break
```
这里出现
```
..\..\..\components\finsh\cmd.c(1063): warning:  #111-D: statement is unreachable
```

是不是我哪里配置的有问题才出现的错误，看起来是语法错误