USB CDC Device Send and Receive data

[GiulianoLeitede]

I'm trying to migrate some code from old FLS USB to KSDK USB stack and I'm facing some troubles to find basic functions like _send and _recv when working with CDC class. The "USB Stack Device RM" on session 3.6.2.6 and 3.6.2.7 saws about "usb_device_cdc_acm_send" and "usb_device_cdc_acm_recv" respectively but I couldn't find those functions anywhere. Also the CDC_VCOM example doesn't make use of them to send and receive data to and from host, instead it writes or reads a buffer and makes use of "USB_DeviceSendRequest" function. Where can I find those _send and _recv functions pointed by documentation?

Thanks

[jorge_a_vazquez]

Hi Giuliano Vitor

Seams that USB documentation for SDK 2.0 is not updated. usb_device_cdc_acm_send and usb_device_cdc_acm_recv were used for SDK 1.3, in SDK 2.0 you can find this functions like USB_DeviceCdcAcmRecv and USB_DeviceCdcAcmSend. For example in the cdc_vcom example you can find in the kUSB_DeviceCdcEventSendResponse and kUSB_DeviceCdcEventRecvResponse events something like:

case kUSB_DeviceCdcEventSendResponse:     
{
...
USB_DeviceCdcAcmRecv(handle,
                     USB_CDC_VCOM_BULK_OUT_ENDPOINT,
                     s_currRecvBuf,
                     g_UsbDeviceCdcVcomDicEndpoints[0].maxPacketSize);‍‍‍‍‍
...
break;
}

case kUSB_DeviceCdcEventRecvResponse:
{
     if ((1 == s_cdcVcom.attach) && (1 == s_cdcVcom.startTransactions))
     {
          s_recvSize = epCbParam->length;
          if (!s_recvSize)
          {
          /* Schedule buffer for next receive event */
          USB_DeviceCdcAcmRecv(handle,
                               USB_CDC_VCOM_BULK_OUT_ENDPOINT,
                               s_currRecvBuf,
                               g_UsbDeviceCdcVcomDicEndpoints[0].maxPacketSize);
...
break;
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

inside USB_DeviceCdcAcmRecv and USB_DeviceCdcAcmSend they used this USB_DeviceRecvRequest and USB_DeviceSendRequest that you mentioned

Hope this information help you

Best Regards

Jorge Alcala