Hi all,

I have got some firmware running based on the CDC example provided by Atmel. I am using the GNU toolchain on some custom hardware and in this case the AT91SAM7S-EK devboard (256).

In order to be able to run batch commands and program an fpga with the microcontroller, I want to send files over the virtual COM port in hyperterminal, wich is connected by the USB interface.

When I start to send a file (textfile transfer, NOT some Xmodem or other protocol), only the first character is received. After that, the microcontroller does not respond anymore. I already tried to disable interrupts but it does not seem to affect the mather.

Does someone know a sollution to this problem, or maybe even can provide me with an example. Xmodem implementation trough USB would be a neat sollution to, obviously.

Thanks in advance!

So let me kick this topic up a little bit...

This is what I found recently:
The usb transfer works properly, as long as the string that is transfered from some terminal does not exceed 8 characters (incl. \r).

Than the 8 characters are put in the usbBuffer and can be processed. When I send a string that exceeds those 8 characters, only one single character is received every time, for as long as the transfer lasts.

I am using the cdc-serial example provided by Atmel.