SV: [sdiy] [Semi-OT] LPC21xx IO

[karl dalen]

--- Antti Huovilainen <ajhuovil at cc.hut.fi> skrev:

> Hi
> 
> I remember there was some discussion a few months ago about using Philips 
> ARM7 parts for diy. Someone mentioned that the IO ran at much lowered 
> speed. What exactly does this mean? GPIO bitbanging instructions take 
> forever? All communication with io peripherals (onboard UARTs etc) are 
> slow too?

It means that you cant set and unset a I/O port any
faster then aprox 3,43Mhz wich is crap. LPC2106 has all these problems.

Also, on several models the SPI are "extrodinary slow" so slow 
that you have troubble to interface a standard codec to the LPC.

Altought, all this hassle might have been cured in later LPC models.

Check the LPC21xx mail list for full details and current status.

> Olimex LPC-H2106 looks rather attractive for diy. 40 pin wide dip header 
> board, onboard oscillator & voltage regulators, only 54e incl VAT from 
> local supplier.

Folks are generally happy about bying from Olimex even directly from them.

REG
KD