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How to transfer data in two VCPs with DUAL CDC composite device

moulay-hassan
Associate II

‎2016-05-30 04:23 AM

Posted on May 30, 2016 at 13:23

I have emulated two VCPs with only one USB Device. I can send data in one VCP that has the following Endpoint Address.

#define CDC_IN_EP 0x81 /* EP1 for data IN */#define CDC_OUT_EP 0x01 /* EP1 for data OUT */#define CDC_CMD_EP 0x82 /* EP2 for CDC commands */

I would like to know if it's possible to send data in the other VCP with other Endpoint Address like :

#define CDC_IN_EP3 0x83 /* EP3 for data IN */#define CDC_OUT_EP3 0x03 /* EP3 for data OUT */#define CDC_CMD_EP4 0x84 /* EP4 for CDC commands */

My problem is that addresses others than 0x81 don't allow me to send data over the second VCP. I'm using two CDC interfaces Full-Speed. Normally we can use 7 endpoints with CDC_FS and that's what I'm trying to do.. I have 6 Endpoints: 3 for each VCP and the seventh is Endpoint 0 for configuration.

Have I missed something in the Endpoints Configuration or in the Composite Device Descriptors ?

Thank you guys.

#composite #device #usb #stm32
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