Forum Post: RE: USB TESTMODE　Register

Michi,

[quote user="Michi Yama"]Our customer can write to the USB TESTMODE register. But USB signal does not be output.[/quote]

Do you mean that you have nothing on the USBx_DP/DM pins when enter in test mode?

Refer to the below wiki page:

http://processors.wiki.ti.com/index.php/Usbgeneralpage

To send test packet

 #echo "test packet" > /sys/kernel/debug/testmode 

To generate test K pattern

 #echo "test K" > /sys/kernel/debug/testmode 

To generate test J pattern

 #echo "test J" > /sys/kernel/debug/testmode 

To generate test SE0 NAK pattern

#echo "test SE0 NAK" > /sys/kernel/debug/testmode

Best regards,
Pavel