Lpc2000

--- In lpc2000@yahoogroups.com, "catstransport" <remco@u...> wrote:
> --- In lpc2000@yahoogroups.com, David Willmore <willmore@o...> wrote:
> > > catstransport <remco@u...> wrote:Hi all,
> > > I am a newby in writing to external memory. The RAM works. I can
write
> > > to it. But the flash is a problem. We have combined two 16bit
flash to
> > > the lpc2292. I have found flash drivers for the 16bit. But I have to
> > > write with 32bit. I just don't know how to get it work.
> > > 
> > > the memory is: 2 x m29w320DB on bcfg0. bcfg0 = 0x2000348f. After I
> > > write 0x00AA0AA to flashBase[0x05550555] the whole microcontroller
> > > doesn't do anything anymore. Can somebody help me with this problem.
> > 
> > You need 0x00AA to appear on the 16 bit data bus for each FLASH,
right?
> > You also need their address likes to read 0x0555?  Yeah, checked the
> > data sheet from ST, that's right.  
> > 
> > Okay, so you you want is flashBase[0x00000555] = 0x00aa00aa
> > 
> > Keep in mind that your address lines are in parallel to the chips, so
> > you don't need to replicate the pattern in the address bits.  The data
> > bits are concatinated, so you do need to replicate that data.
> > 
> > So, you could:
> > flashBase[command_addr]= (command_data | (command_data << 16));
> > 
> > for all of the commands and then:
> > flashBase[data_addr] = data_32;
> > 
> > for the actual data write.
> > 
> > Does that make sense?  It's always a bit hard to wrap your head
> > around the first time, but it's second nature after that. :)
> > 
> > Cheers,
> > David
> 
I Have tried it but still I see only a empty flash when I read the
address. I have download the st flashdrivers for 16 bit. And I have
changed it with the above changes and it still will not write.

I gonna look with a scope to see if the data lines toggling.

cheers remco