Objective Development Forums

I will implements mass storage class on v-usb, mass stroage class must use bulk in,bulk out. when read a sector,need 64 packets(8 bytes per packet),often lose packet. I look usb 1.1 spec, when bulk in transfer,host will send ack. 1.whether or not v-usb check ack? 2.How to send empty bulk in packet?

default USB_BUFFSIZE = 11, I set USB_BUFFSIZE = 67,It' working

It's working now, because use Interrupt must set GICR IVSEL (in Atmega16)

The power switch sample, place in boot loader area, it's not work, computer say unknow usb device, but place in program area ,it's ok, why?
atmega16 + 1k words boot loader area + BOOTRST = 0

1, On bulk in transfer ,always the host can't see first pakcet,for example: device send amount 36 bytes,8 bytes per packet, host only receive 28 bytes. 2. On bulk in transfer,if i continue with send, host will ruleless can't see any packet. 3. In AVR-Droper code ,he said "// start with empty fr...

Bulk out will call usbFunctionWriteOut, buf bulk in not call usbFunctionRead, how to implements bulk in? thanks advance.

I want to implements a mass storage device,but the bulk command is 31 bytes,what can I do?
thanks advance.

I want to make the composite USB device consisting of two parts.
1. Hid-Class
2. CDC-Class

How do I go about doing this? thanks!