Cypress USB3014 controlEndPoint 使用事項

control endpoint 發送，接收數據 返回fasle ， lastError = 997， 抓包查看 Control Transfer (UP) XXXXXXXXX 1. Device: FX3 Status: 0xc0000004

USBD_STATUS_STALL_PID 0xC0000004 The device returned a stall packet identifier (defined for backward compatibility with the USB 1.0)

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須要在CyU3PUsbRegisterSetupCallback的註冊回調函數中去定義相應的Req Type ，Target以及Req code等等，而後進行處理，不然就返回error。。

https://community.cypress.com/thread/13031?start=0&tstart=0

Did you make sure that the device responds properly to the vendor command? Is it handled in your firmware? The 997 error iscaused if the device does not send anything.

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FX3/CX3 簡介
https://blog.csdn.net/a379039233/article/details/53425202

FX3/CX3 DMA Overview
http://www.voidcn.com/article/p-faedbthz-dk.html