Followup- it's still not possible to set bit 0 in EXTMODE/EXTPOLAR
even using the workaround suggested in the errata, but I was able to
workaround this further limitation by setting bits for other EXTINTs
along with bit 0. I'm only using EXTINT0 but hopefully changing the
polarity of unused interrupts isn't going to mess anything up.
--- In lpc2000@yahoogroups.com, "bell_c_d" <bell_c_d@y...> wrote:
>
> Thanks, I just found the workaround in the errata.
>
> --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
> >
> > The EXTMODE and EXTPOLAR have some serious bugs for all but the
> latest
> > LPCs. I suggest you look at the errata for the chip you are
using.
> >
> > Richard Duits.
> >
> >
> > bell_c_d wrote:
> >
> > > I'm trying to set EXTINT0 to active-high, edge-sensitive (i.e.
> set
> > > EXTPOLAR and EXTMODE to 1), but am unable to set/read back bit
0
> in
> > > either of the registers. FWIW, bit 1 (for EXTINT1) sets/reads
> back
> > > successfully.
> > >
> > > The code sample below looks correct. Does anyone have any
ideas?
> > >
> > > byte b=EXTPOLAR;
> > > E3A0320E mov r3, #0xE0000000
> > > E283397F add r3, r3, #0x001FC000
> > > E3A02F53 mov r2, #0x0000014C
> > > E7D33002 ldrb r3, [r3, r2]
> > > E54B300D strb r3, [r11, #-13]
> > > EXTPOLAR = 1; // set EXTINT0 active high
> > > E3A0220E mov r2, #0xE0000000
> > > E282297F add r2, r2, #0x001FC000
> > > E3A01F53 mov r1, #0x0000014C
> > > E3A03001 mov r3, #0x00000001
> > > E7C23001 strb r3, [r2, r1]
> > > b=EXTPOLAR;
> > > E3A0320E mov r3, #0xE0000000
> > > E283397F add r3, r3, #0x001FC000
> > > E3A02F53 mov r2, #0x0000014C
> > > E7D33002 ldrb r3, [r3, r2]
> > > E54B300D strb r3, [r11, #-13]
> > > b=EXTMODE;
> > > E3A0320E mov r3, #0xE0000000
> > > E283397F add r3, r3, #0x001FC000
> > > E3A02F52 mov r2, #0x00000148
> > > E7D33002 ldrb r3, [r3, r2]
> > > E54B300D strb r3, [r11, #-13]
> > > EXTMODE = 1; // set EXTINT0 edge-sensitive
> > > E3A0220E mov r2, #0xE0000000
> > > E282297F add r2, r2, #0x001FC000
> > > E3A01F52 mov r1, #0x00000148
> > > E3A03001 mov r3, #0x00000001
> > > E7C23001 strb r3, [r2, r1]
> > > b=EXTMODE;
> > > E3A0320E mov r3, #0xE0000000
> > > E283397F add r3, r3, #0x001FC000
> > > E3A02F52 mov r2, #0x00000148
> > > E7D33002 ldrb r3, [r3, r2]
> > > E54B300D strb r3, [r11, #-13]
> > >
> > >
> > >
> > >
> > >
> > >
> > > ---------------------------------------------------------------
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