/**
* This function will stop cdc function, it will be called on handle set configuration request.
*
* @param func the usb function object.
*
* @return RT_EOK on successful.
*/
static rt_err_t _function_disable(ufunction_t func)
{
struct vcom *data;
RT_ASSERT(func != RT_NULL);
RT_DEBUG_LOG(RT_DEBUG_USB, ("cdc function disable\n"));
_vcom_reset_state(func);
data = (struct vcom*)func->user_data;
if(data->ep_out->buffer != RT_NULL)
{
rt_free(data->ep_out->buffer);
data->ep_out->buffer = RT_NULL;
}
return RT_EOK;
}
/**
* This function will run cdc function, it will be called on handle set configuration request.
*
* @param func the usb function object.
*
* @return RT_EOK on successful.
*/
static rt_err_t _function_enable(ufunction_t func)
{
struct vcom *data;
RT_ASSERT(func != RT_NULL);
RT_DEBUG_LOG(RT_DEBUG_USB, ("cdc function enable\n"));
_vcom_reset_state(func);
data = (struct vcom*)func->user_data;
data->ep_out->buffer = rt_malloc(CDC_RX_BUFSIZE);
data->ep_out->request.buffer = data->ep_out->buffer;
data->ep_out->request.size = EP_MAXPACKET(data->ep_out);
data->ep_out->request.req_type = UIO_REQUEST_READ_MOST;
rt_usbd_io_request(func->device, data->ep_out, &data->ep_out->request);
return RT_EOK;
}
static int _vcom_putc(struct rt_serial_device *serial, char c)
{
rt_uint32_t level;
int cnt;
/*if (vcom_connected != RT_TRUE)
{
return 0;
}*/
/* if the buffer is full, there is a chance that the host would pull some
* data out soon. But we cannot rely on that and if we wait to long, just
* return. */
for (cnt = 500;
RT_RINGBUFFER_EMPTY(&tx_ringbuffer) == 0 && cnt;
cnt--)
{
/*rt_kprintf("wait for %d\n", cnt);*/
/*if (vcom_connected != RT_TRUE)
return 0;*/
}
if (cnt == 0)
{
/* OK, we believe that the connection is lost. So don't send any more
* data and act as the USB cable is not plugged in. Reset the VCOM
* state machine */
_vcom_reset_state();
return 0;
}
level = rt_hw_interrupt_disable();
if (RT_RINGBUFFER_EMPTY(&tx_ringbuffer))
{
rt_ringbuffer_putchar(&tx_ringbuffer, c);
}
rt_hw_interrupt_enable(level);
return 1;
}
