Hello, I am trying to stream audio from usb audio device to my embedded host through USB 2.0. My host system is arm based . device is configured as audio device and using USB Audio class driver in Isochronous mode. Every thing is working fine but suddenly while audio is being streamed we get an USB error EOVERFLOW and host controller doesn't detect the device any more. I have checked the "Current Connect Status" bit (bit-0) in PORTSC register according to EHCI specification. Its value is 0. Which means that after EOVERFLOW error occurs connection is broken either from device side or host side. I observed USB analyser traces, it shows a failed USB transaction wherein it shows a packet of size 1042 arriving from device to Host whereas the max packet size in isochronous mode is 1024 (Most probable reason for overflow). I am a beginer in USB and my question is that 1. Where should this error be handled, At host controller (h/w) level, HCD level, USB Protocol Level or device firmware . 2. What type of error it is h/w, s/w. 3. I tried to ignore overflow error for that particular micro frame and keep on processing successive uframes but because the "current connect status" is already 0 (disconnected). No use of doing that. Please suggest me how can I prevent or recover from this error at software level. Regards Nitin Arora -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
