Lpc2000

On Sunday 24 July 2005 06:26, majid_mokhtari wrote:
> Hi everybody ,
>
> I have just started using USB instead of RS485 in an especial medical
> instrument . I am surfing on the web  to find a good and practical
> resource  for introducing USB Protocol . It's planned to use  LPC2138
> , although I am also searching for USB controllers .
>
> Any advice is welcomed ,

Why use the LPC2138? It does not have onboard USB and needs an extra chip via 
serial. THis limits what you can do with it.

How about trying the ATMEL SAM7S64?

As for resources, the most helpful thing I have found with USB is using libusb 
(ask uncle Google). This cuts through all the bull of writing drivers etc and 
gets you going a lot faster, as well as being OS independent.

I find your logic to switch from RS485 to USB curious. They perform very 
different roles. USB is good for communications between a device and a PC. 
Between devices, CAN is a very good idea. CAN provides a similar function in 
many ways to RS485 in that it is peer-to-peer and multi-drop.