Re: Faster LIN or simpler CAN or ...? PIC16 or Cypress FX2LP or ...?

Bill Davy wrote:
> To support various modules inside a machine. The likely architecture
> is a front end PC talking USB 2.0 to a Cypress FX2LP in the machine.
> That then splits the control work out to various nodes (spinner,
> motor, shutter, laser, etc), connected by a bus.
>
>
>
> a) CAN involves me in checking each message was received once and
> only once. There's not a lot of space in the Cypress for that sort of
> thing.
>
>
>
> b) We could use LIN but it seems jolly slow. Would mean a nice simple
> processor in each node with a little programming and offering some
> flexibility.
>
>
>
> c) We could use a modified form of I2C but that means no intelligence
> at each node (and no programming, which is quite a good thing, in
> some ways).
>
>
>
> Can I do LIN master in the Cypress FX2 (8051 based with a couple of
> UART's)?
>
> Is there a reasonably standard way for doing LIN slave? I'd prefer
> 8051 based (so I can go on using the Keil compiler) or PIC16 (which
> we have also used).
>
> Any other thoughts (but not too innovative - this is a development
> project)?

Control stuff feom a PC and use of USB throughout?
No Central CPU, just some Hubs.
AT89C5131 is 8051 with USB

Run a Fast USART : TXD,RXD,SCLK (driven by master) over RS485.
This is supported by AVRs and AT91 ARMs.
You would need a resonator with each node, but the speed is higher.
There are free GNU compilers /AVR Studio for the AVR.
ARMs up to 32 kB (AT91SAM7S321) compilers are
quite often free of charge (Code restriction <= 32 kB).

I think You would enjoy AVR or ARM programming over 8051/PIC. Most do.

>
>
> tia,
>
> Bill

--
Best Regards,
Ulf Samuelsson
ulf@xxxxxxxxxxxxx
This message is intended to be my own personal view and it
may or may not be shared by my employer Atmel Nordic AB


.

Relevant Pages