/**
* This function will handle system sof event.
*
* @param device the usb device object.
*
* @return RT_EOK on successful.
*/
static rt_err_t _class_sof_handler(udevice_t device, uclass_t cls)
{
rt_uint32_t level;
rt_size_t size;
static rt_uint32_t frame_count = 0;
cdc_eps_t eps;
if(vcom_connected != RT_TRUE) return -RT_ERROR;
eps = (cdc_eps_t)cls->eps;
if (frame_count ++ == 5)
{
rt_size_t mps = eps->ep_in->ep_desc->wMaxPacketSize;
/* reset the frame counter */
frame_count = 0;
size = RT_RINGBUFFER_SIZE(&tx_ringbuffer);
if(size == 0) return -RT_EFULL;
size = size > mps ? mps : size;
level = rt_hw_interrupt_disable();
rt_ringbuffer_get(&tx_ringbuffer, eps->ep_in->buffer, size);
rt_hw_interrupt_enable(level);
/* send data to host */
dcd_ep_write(device->dcd, eps->ep_in, eps->ep_in->buffer, size);
}
return RT_EOK;
}
/**
* This function will handle get_string_descriptor request.
*
* @param device the usb device object.
* @param setup the setup request.
*
* @return RT_EOK on successful, -RT_ERROR on invalid request.
*/
static rt_err_t _get_string_descriptor(struct udevice* device, ureq_t setup)
{
struct ustring_descriptor str_desc;
rt_uint8_t index, i;
rt_uint32_t len;
/* parameter check */
RT_ASSERT(device != RT_NULL);
RT_ASSERT(setup != RT_NULL);
RT_DEBUG_LOG(RT_DEBUG_USB, ("_get_string_descriptor\n"));
str_desc.type = USB_DESC_TYPE_STRING;
index = setup->value & 0xFF;
if (index > USB_STRING_INTERFACE_INDEX)
{
rt_kprintf("unknown string index\n");
dcd_ep_stall(device->dcd, 0);
return -RT_ERROR;
}
if (index == 0)
{
str_desc.bLength = 4;
str_desc.String[0] = 0x09;
str_desc.String[1] = 0x04;
}
else
{
len = rt_strlen(device->str[index]);
str_desc.bLength = len*2 + 2;
for (i=0; i<len; i++)
{
str_desc.String[i*2] = device->str[index][i];
str_desc.String[i*2 + 1] = 0;
}
}
if (setup->length > str_desc.bLength)
len = str_desc.bLength;
else
len = setup->length;
/* send string descriptor to endpoint 0 */
dcd_ep_write(device->dcd, 0, (rt_uint8_t*)&str_desc, len);
return RT_EOK;
}
/**
* This function will handle cdc_get_line_coding request.
*
* @param device the usb device object.
* @param setup the setup request.
*
* @return RT_EOK on successful.
*/
static rt_err_t _cdc_get_line_coding(udevice_t device, ureq_t setup)
{
struct ucdc_line_coding data;
rt_uint16_t size;
RT_ASSERT(device != RT_NULL);
RT_ASSERT(setup != RT_NULL);
data.dwDTERate = 115200;
data.bCharFormat = 0;
data.bDataBits = 8;
data.bParityType = 0;
size = setup->length > 7 ? 7 : setup->length;
dcd_ep_write(device->dcd, 0, (void *)&data, size);
return RT_EOK;
}
/**
* This function will handle cdc bulk in endpoint request.
*
* @param device the usb device object.
* @param size request size.
*
* @return RT_EOK.
*/
static rt_err_t _ep_in_handler(udevice_t device, rt_size_t size)
{
rt_uint32_t level;
rt_size_t length;
rt_size_t mps = ep_in->ep_desc->wMaxPacketSize;
size = RT_RINGBUFFER_SIZE(&tx_ringbuffer);
if(size == 0) return RT_EOK;
length = size > mps ? mps : size;
level = rt_hw_interrupt_disable();
rt_ringbuffer_get(&tx_ringbuffer, ep_in->buffer, length);
rt_hw_interrupt_enable(level);
/* send data to host */
dcd_ep_write(device->dcd, ep_in, ep_in->buffer, length);
return RT_EOK;
}
/**
* This function will handle get_config_descriptor request.
*
* @param device the usb device object.
* @param setup the setup request.
*
* @return RT_EOK on successful.
*/
static rt_err_t _get_config_descriptor(struct udevice* device, ureq_t setup)
{
rt_size_t size;
ucfg_desc_t cfg_desc;
/* parameter check */
RT_ASSERT(device != RT_NULL);
RT_ASSERT(setup != RT_NULL);
RT_DEBUG_LOG(RT_DEBUG_USB, ("_get_config_descriptor\n"));
cfg_desc = &device->curr_cfg->cfg_desc;
size = (setup->length > cfg_desc->wTotalLength) ?
cfg_desc->wTotalLength : setup->length;
/* send configuration descriptor to endpoint 0 */
dcd_ep_write(device->dcd, 0, (rt_uint8_t*)cfg_desc, size);
return RT_EOK;
}
/**
* This function will handle get_device_descriptor request.
*
* @param device the usb device object.
* @param setup the setup request.
*
* @return RT_EOK on successful.
*/
static rt_err_t _get_device_descriptor(struct udevice* device, ureq_t setup)
{
rt_size_t size;
/* parameter check */
RT_ASSERT(device != RT_NULL);
RT_ASSERT(setup != RT_NULL);
RT_DEBUG_LOG(RT_DEBUG_USB, ("_get_device_descriptor\n"));
/* device descriptor length should less than USB_DESC_LENGTH_DEVICE*/
size = (setup->length > USB_DESC_LENGTH_DEVICE) ?
USB_DESC_LENGTH_DEVICE : setup->length;
/* send device descriptor to endpoint 0 */
dcd_ep_write(device->dcd, 0, (rt_uint8_t*)&device->dev_desc,
size);
return RT_EOK;
}
