More than 2 USB CDC endpoints with SAMD21 ??

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bseng
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Joined: Fri. May 13, 2016
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Posted by bseng: Thu. Dec 5, 2019 - 10:43 PM
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Any way to get more than 2 USB CDC endpoints with the SAMD21 and ASF3 ??

Tried setting "#define UDI_CDC_PORT_NB 4" in conf_usb.h but I get this error:

 

/xdk-asf-3.47.0//common/services/usb/class/cdc/device/udi_cdc_conf.h:99:6: error: #error USBB, UDP, UDPHS and UOTGHS interfaces have not enought endpoints.
 #    error USBB, UDP, UDPHS and UOTGHS interfaces have not enought endpoints.

 

Works with 2 CDC endpoints ...

ASF library code seems to only support 2 endpoints for non-XMEGA targets.

What about creating a composite device with two sub-devices each with two ports ?

 

Thanks

 

Tags:

Atmel SMART ARM-based MCUs and MPUs, Atmel Cortex-M MCUs
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westfw
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Joined: Wed. Jun 19, 2002
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Posted by westfw: Fri. Dec 6, 2019 - 07:20 PM
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Two sounds right.  Each cdc uses three endpoints, and the samD21 has 8 available.

 

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