5 rt_pin_attach_irq()函数返回值=7

发布于 2022-08-08 16:06:41 浏览：935 订阅该版

crystal266 2022-08-08

嵌入式

rt_pin_attach_irq 的源码如下：
```c
rt_err_t rt_pin_attach_irq(rt_int32_t pin, rt_uint32_t mode, void (*hdr)(void *args), void  *args)
{
    RT_ASSERT(_hw_pin.ops != RT_NULL);
    if(_hw_pin.ops->pin_attach_irq)
    {
        return _hw_pin.ops->pin_attach_irq(&_hw_pin.parent, pin, mode, hdr, args);
    }
    return -RT_ENOSYS;
}

static rt_err_t stm32_pin_attach_irq(struct rt_device *device, rt_int32_t pin, rt_uint32_t mode, void (*hdr)(void *args), void *args)
{
    const struct pin_index *index;
    rt_base_t level;
    rt_int32_t irqindex = -1;

index = get_pin(pin);
    if (index == RT_NULL)
    {
        return RT_ENOSYS;
    }
    irqindex = bit2bitno(index->pin);
    if (irqindex < 0 || irqindex >= ITEM_NUM(pin_irq_map))
    {
        return RT_ENOSYS;
    }

level = rt_hw_interrupt_disable();
    if (pin_irq_hdr_tab[irqindex].pin == pin &&
            pin_irq_hdr_tab[irqindex].hdr == hdr &&
            pin_irq_hdr_tab[irqindex].mode == mode &&
            pin_irq_hdr_tab[irqindex].args == args)
    {
        rt_hw_interrupt_enable(level);
        return RT_EOK;
    }
    if (pin_irq_hdr_tab[irqindex].pin != -1)
    {
        rt_hw_interrupt_enable(level);
        return RT_EBUSY;
    }
    pin_irq_hdr_tab[irqindex].pin = pin;
    pin_irq_hdr_tab[irqindex].hdr = hdr;
    pin_irq_hdr_tab[irqindex].mode = mode;
    pin_irq_hdr_tab[irqindex].args = args;
    rt_hw_interrupt_enable(level);

return RT_EOK;
}
```

上述代码会将中断统一放在 `pin_irq_hdr_tab` 数组中，你在调试的时候看一下，`pin_irq_hdr_tab` 这个表是否和默认初始化的值一样，另外看一下你代码在函数 `stm32_pin_attach_irq()` 中计算得到的 `irqindex` 的值是多少？然后代码根据 `pin_irq_hdr_tab[irqindex].pin` 是否是 `-1`，也就是是否还有未初始化的成员来判断是否可以绑定中断回调函数，否则就直接返回 `RT_EBUSY(7)`

你一共初始化了几个 IO 中断？是不是有类似 PA3 PB3 这种情况都初始化 IO 中断了？可以把你所有关于 IO 中断初始化和绑定回调函数的代码贴上来。
```c
static struct rt_pin_irq_hdr pin_irq_hdr_tab[] =
{
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
};
```

RTT_STUDY 2022-08-08

笨鸟先飞

RTT_STUDY 2022-08-08

笨鸟先飞

crystal266 2022-08-08

嵌入式

RTT_STUDY 2022-08-09

笨鸟先飞

crystal266 2022-08-09

嵌入式

[@RT_Student](https://club.rt-thread.org/u/01caa74ff770ad93 'RT_Student')
你是用中断发送的还是轮询发送的？我还没用过中断发送，轮询发送的源码如下，这里面是不会出现申请空间的操作的。  rt_serial_write -> _serial_poll_tx -> serial->ops->putc(将要发送的数据写到寄存器中)
```c
static rt_size_t rt_serial_write(struct rt_device *dev,
                                 rt_off_t          pos,
                                 const void       *buffer,
                                 rt_size_t         size)
{
    struct rt_serial_device *serial;

RT_ASSERT(dev != RT_NULL);
    if (size == 0) return 0;

serial = (struct rt_serial_device *)dev;

if (dev->open_flag & RT_DEVICE_FLAG_INT_TX)
    {
        return _serial_int_tx(serial, (const rt_uint8_t *)buffer, size);
    }
#ifdef RT_SERIAL_USING_DMA
    else if (dev->open_flag & RT_DEVICE_FLAG_DMA_TX)
    {
        return _serial_dma_tx(serial, (const rt_uint8_t *)buffer, size);
    }
#endif /* RT_SERIAL_USING_DMA */
    else
    {
        return _serial_poll_tx(serial, (const rt_uint8_t *)buffer, size);
    }
}

rt_inline int _serial_poll_tx(struct rt_serial_device *serial, const rt_uint8_t *data, int length)
{
    int size;
    RT_ASSERT(serial != RT_NULL);

size = length;
    while (length)
    {
        /*
         * to be polite with serial console add a line feed
         * to the carriage return character
         */
        if (*data == '\n' && (serial->parent.open_flag & RT_DEVICE_FLAG_STREAM))
        {
            serial->ops->putc(serial, '\r');
        }

serial->ops->putc(serial, *data);

++ data;
        -- length;
    }

return size - length;
}
```

你把你写的代码贴上来，伪代码的逻辑看着是没有问题的，不会导致内存泄露。