Lpc2000

--- In lpc2000@yahoogroups.com, "Ken Wada" <kwada@a...> wrote:

Ken,

thanks for the feedback. Regarding topic 5°, any differences in 
vector setup between using internal flash and external flash (did use 
the 2106 before)?

Patrick

>
> Byte accesses on these 16-bit FLASH devices are not a problem! From 
> what I can tell, you are most likely using an Intel 16-bit wide 
> StrataFlash, or one of those Micron 16-bit wide, (very much like 
the 
> Intel NOR-StrataFlash).
> 
> The issues are:
> 1.  You can do all reads as a 16-bit device, (just configure your 
> BCFGn register properly for 16-bit bus
> 2.  To write bytes to this device, you just read the 16-bit value, 
> modify the upper, or lower byte, and write the value back.
> 3.  From what I can tell, the only real reason you need to write to 
> this device is to download the code...in this case, you do not need 
to 
> concern yourself with byte accesses at all! Just do everything 
using 
> unsigned short data types.
> 4.  If your BCFGn register is properly configured, your code will 
run 
> just fine from the external FLASH device....provided you burned it 
> properly.
> 5.  Don't forget to make sure your interrupt vectors are setup 
> properly, otherwise nothing will work. This is one of the small 
> caveats on using external FLASH for the LPC devices.
> 
> Ken Wada
> 
> --- In lpc2000@yahoogroups.com, "smoutpatrick" <sonpat@b...> wrote:
> >
> > 
> > --- In lpc2000@yahoogroups.com, Tom Walsh <tom@o...> wrote:
> > >
> > > smoutpatrick wrote:
> > > 
> > > >Hi,
> > > >
> > > >What would be the consequences if my hardware design based on 
the 
> > > >LPC2214 uses 16 bit flash devices that only supports 16 bit 
> > accesses?
> > > >Can I write bytes in the flash using the __packed type 
modifier?
> > > >
> > > >Thanks for the feedback,
> > > >
> > > >  
> > > >
> > > That would be solely dependant on your Flash. Look to your 
> > datasheet on 
> > > the Flash device.
> > > 
> > > TomW
> > > 
> > > -- 
> > > Tom Walsh - WN3L - Embedded Systems Consultant
> > > http://openhardware.net, http://cyberiansoftware.com
> > > "Windows? No thanks, I have work to do..."
> > > ----------------------------------------------------
> > >
> > Tom,
> > 
> > what should i look for in the datasheet?
> > The datasheet tells me that no byte access is supported (see 
> original 
> > posting).
> > My guess is that the compiler might help me but I'm not sure.
> > 
> > Patrick
> >
>