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USBDevice模式下SETUP在线程模式中处理无法发包 #8

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ranbochen opened this issue Apr 14, 2020 · 1 comment

ranbochen commented Apr 14, 2020

主机使用CTRL-TRANSFER来获取数据的时候
如果不在SETUP回调函数（class-handler）中立即发送数据
而转到线程中再调用tusb_control_send，则主机无法收到发送的数据
用wireshark抓包，返回的包长度为0字节

比如：HID-GET-REPORT
如果在SETUP中断中立即调用tusb_control_send发送数据，则主机收到正确数据
如果转发到线程模式，在线程中调用tusb_control_send，则主机收到0字节包

Owner

xtoolbox commented Apr 20, 2020

主机使用CTRL-TRANSFER来获取数据的时候
如果不在SETUP回调函数（class-handler）中立即发送数据
而转到线程中再调用tusb_control_send，则主机无法收到发送的数据
用wireshark抓包，返回的包长度为0字节

比如：HID-GET-REPORT
如果在SETUP中断中立即调用tusb_control_send发送数据，则主机收到正确数据
如果转发到线程模式，在线程中调用tusb_control_send，则主机收到0字节包

目前TeenyUSB没有为控制传输设计延迟处理机制，所以出现了这样的情况。感谢你的反馈，后续考虑这种多线程情形下的控制传输处理问题。

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