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cdc_vcom: send a zero-length-packet at the end is transaction

This commit is contained in:
Grissiom 2013-05-10 15:17:59 +08:00
parent 778c4239b1
commit ffb1e62020
1 changed files with 11 additions and 1 deletions
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12
components/drivers/usb/usbdevice/class/cdc_vcom.c
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@ -31,7 +31,9 @@ static struct serial_ringbuffer vcom_int_rx;
static struct rt_serial_device vcom_serial;
#define CDC_MaxPacketSize 64
ALIGN(RT_ALIGN_SIZE)
static rt_uint8_t rx_buf[CDC_MaxPacketSize];
ALIGN(RT_ALIGN_SIZE)
static rt_uint8_t tx_buf[CDC_MaxPacketSize];
static rt_bool_t vcom_connected = RT_FALSE;
@ -148,6 +150,7 @@ const static char* _ustring[] =
"Interface",
};
static rt_bool_t _in_sending;
/**
* This function will handle cdc bulk in endpoint request.
*
@ -167,7 +170,14 @@ static rt_err_t _ep_in_handler(udevice_t device, uclass_t cls, rt_size_t size)
mps = eps->ep_in->ep_desc->wMaxPacketSize;
size = RT_RINGBUFFER_SIZE(&tx_ringbuffer);
if(size == 0)
{
if (_in_sending)
{
_in_sending = RT_FALSE;
dcd_ep_write(device->dcd, eps->ep_in, RT_NULL, 0);
}
return RT_EOK;
}
length = size > mps ? mps : size;
@ -398,6 +408,7 @@ static rt_err_t _class_sof_handler(udevice_t device, uclass_t cls)
if(size == 0)
return -RT_EFULL;
_in_sending = RT_TRUE;
size = size > mps ? mps : size;
level = rt_hw_interrupt_disable();
@ -415,7 +426,6 @@ static struct uclass_ops ops =
{
_class_run,
_class_stop,
/*RT_NULL,*/
_class_sof_handler,
};