Hi, everyone:
I use the s3c2410_udc.c,
file_storage.c and others in drivers/usb/gadget to make my PDA
acts as a USB disk to PC.
When my PDA is connected with
PC, it can be realized as a usb disk, I can also copy files
from PDA to PC.But the question is:files cann't be copied from PC to
PDA.After use BUS HOUND and printk, I found some reasons, but don't
know how to do next.
1. when receive WRITE(10) from
PC, PDA do as follow(it's defined in file_storage.c)
1.1 check buffer 1 is
empty?--yes-->receive data from usb, and save data to buffer
1
1.2 check buffer 2 is
empty?--yes-->receive data from usb, and save data to buffer
2
1.3 check buffer 1 is
full?--yes-->write data in buffer 1 to Flash
1.4 check buffer 2 is
full?--yes-->write data in buffer 2 to Flash
1.5 go back to 1.1, until data
ends
The question
is :in step 1.1, for example, when receive 4096 bytes data
from PC, PDA only receive 4032 bytes(receive 63 tims, for each 64
bytes), the last bulk_out interrupt is not received but receive a
interrupt (EP_INT_REG=USB_INT_REG=0, PWR_REG=0, EP0_CSR=0) and after
some seconds, a reset interrupt with bulk_out interrupt is received
and usb bus is reset.
Who
can tell me how the interrupt (EP_INT_REG=USB_INT_REG=0,
PWR_REG=0, EP0_CSR=0) is produced when it's not EP interrupt
or USB interrupt?
Who can tell me why the last
bulk_out interrupt is not received by PDA?
thanks in advance!
Yours 施金前
2009-03-24
snoppy1314
