Philips LPC2xxx variant port

[Jonathan Larmour]

Jani Monoses wrote:
> I made  the changes you suggested including the new var_io names and 
> will shortly send the updated patch.
> 
>>> +cyg_uint32 lpc_cclk;    //CPU clock frequency
>>> +cyg_uint32 lpc_pclk;    //peripheral devices clock speed (equal to, 
>>> half, or quarter of CPU clock)
> 
> 
> I did not make these CDL constant values so they can be changed at 
> runtime when setting a different VPBDIV.

Hmm... setting a different VPBDIV is already problematic as anything that 
relies on it will in turn need to be reinitialised, otherwise e.g. serial 
chars will be at the wrong rate.

But I guess we should allow for this to be handled better in the future and 
allow it to be variable, so ok.

Although... an accessor macro would arguably be the absolutely correct way 
to do it (which can therefore point to a global, or function or constant or 
whatever). I'll leave it to you to decide if it's worth it. Some people 
take global variables accessed only via macros as a software engineering 
doctrine.

> Should I add a cyg_ prefix to 
> them? After a quick grep though packages/devs I don't see a naming 
> pattern that devices use for extern variables that are set in the HAL.

cyg_hal_arm_lpc2xxx_cclk/pclk would be better I guess.[1] Oh the joys of 
hierarchical naming ;-).

Jifl
[1] Or CYG_HAL_ARM_LPC2XXX_CCLK()/PCLK() if you do go with the accessor macro.
-- 
eCosCentric    http://www.eCosCentric.com/    The eCos and RedBoot experts
--["No sense being pessimistic, it wouldn't work anyway"]-- Opinions==mine