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USB Printer Class: Cannot print

Question asked by blaha.fernando on Aug 31, 2015
Hello to all,
I'm trying to implement a printer class for the USB. Currently I'm using the STM32F4 Discovery.
I already have working the detection of the printer (EPSON CX5600) , reading the ID, etc.

What I cant make work is printing. I'm sending via bulk out ESCPOS commands, but nothing goes out of the printer. The only thing that happens is that, if the printer goes to sleep because of long time of inactivity, when I send the commands to print, the print awakes.

Does anybody have more information or any experience on this?
Thanks to all.