[En-Nut-Discussion] LPC2138 port

addisu addisu at ciholas.com
Mon Oct 15 10:04:00 CEST 2007


Has anyone had any more luck with getting ethernut to work on LPC21xx?  I
have been looking at the port for LPC22xx on the Yagarto website but I am
not very familiar with linker scripts and start up codes so I havent had
much luck.


Alain M. wrote:
> Ole Reinhardt escreveu:
>> Hi,
>>> LPC2138 is a much better cpu than Atmel's. I will not change from 
>>> Nut/OS, but I would gladly change to LPC if it were possible.
>>> Just one comparison: LPC2138 runs at 60MHz zero wait states, SAM7 runs 
>>> at 55MHz one wait state. It's a BIG difference, even considering thumb
>>> mode.
>> One big drawbag is the limited amount of on-chip ram. 32 KB is quite
>> limited for a 32Bit CPU.
> -------- From the DataSheet
> 32 kB of SRAM on the ARM local bus for high performance CPU access.
> 16 kB SRAM for Ethernet interface. Can also be used as general purpose
> 8 kB SRAM for general purpose DMA use also accessible by the USB.
> -------
> Which makes 56k, not that bad. The Ethernet and USB memories is on a 
> separate buses so that their DMA does not afect program speed. Using 
> them as general purpose RAM is slower.
> This brings a drawback: it's architecture is much more complicated :(
> Alain
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion

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