PIC18F4550 USB, Data overflow??? Help

[Dymtra]

Hi, i'm trying to send and receive data from one pc to another via USB, i'm using two PIC's 18F4550 and VC++.

The problem is that it only works once in each pic, what i mean is that i can send from pc and receive in the other one, and do the same in the other PC, but after this i only receive an " í " with the two pics.

I don't know if this is due to a data overflow in the pic or in the PC's. In the case of the pic i'm using the CCS compiler and the usb_hw_layer.h, and i'm using the functions usb_get_packet and usb_put_packet, and it mentions that when you use this you don't have to use usb_flush_in or usb_flush_out.

What could be the problem?

 

[lockman_akim]

hye,, try take a look at this site.. maybe it you can use the project they make as your reference..
Open Source Framework for USB Generic HID devices based on the PIC18F and Windows - WFFwiki

 

[A.Anand Srinivasan]

What device class are you using?? HID, Generic??
What is your endpoint type??
When you say you read the 2nd time say in PC1. Have you sent 2 packets from PC2 or have you just sent 1 and you're trying to read the endpoint which does not have data??

 

[Dymtra]

What device class are you using?? HID, Generic??
What is your endpoint type??
When you say you read the 2nd time say in PC1. Have you sent 2 packets from PC2 or have you just sent 1 and you're trying to read the endpoint which does not have data??

I'm using a generic class.
My endpoint is Toggle type.

And i send a character say "a" from PC1 and then i receive it in PC2 but when i send another character from the PC1, the PC2 receives an "í".