Lpc2000

It is IODIR0 in the Keil compiler.  I think it is IO0DIR in IAR and
others.

Sutton



--- In lpc2000@yahoogroups.com, "K B Shah-lascaux" <kbshah@...> wrote:
>
> Is it not suppose to be IO0DIR  &= 0x8FFFFFFF;...???  (You have
IODIR0 )   ???
>   ----- Original Message ----- 
>   From: Sutton Mehaffey 
>   To: lpc2000@yahoogroups.com 
>   Sent: Friday, March 03, 2006 4:56 PM
>   Subject: [lpc2000] Re: AD0 not working properly - help
> 
> 
>   Richard,
> 
>   I had these set up in an init file that I didn't include with the
code.
> 
>   Also, it didn't matter if I did the write to AD0CR all at once or
>   separate.  No change in the data.
> 
>   I couldn't find anything in the errata sheet.  I printed out Errata
>   1.2 released on 2/27.  Where is the errata you were referring to?
> 
>   Sutton
> 
> 
>   IODIR0 &= 0x8FFFFFFF;   // AD0 (P0.28, P0.29, P0.30) defined as inputs
>   PCONP |= 0x00001000;    // Enable AD0
>   PINSEL1 |= 0x15000000;  // AD0.1, AD0.2, AD0.3 all defined
> 
>   AD0CR = 0x01200404;
> 
>   // AD0CR |= 0x00200000;  // turn on AD0
>   // AD0CR |= 0x00000400;  // divide 12Mhz clock by 3 (max 4.5Mhz
ADC clk)
>   // AD0CR |= 0x00000004;  // select channel AD0.2
>   // AD0CR |= 0x01000000;  // start conversion now
> 
>   while ((AD0STAT & 0x00000004) == 0);  // DONE2 status bit in AD0STAT
>   result = (AD0DR2 & 0x0000FFC0) >> 6;  // bits 6-15 are result (0-2055)
> 
> 
> 
> 
>   --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@> wrote:
>   >
>   > You should start the AD conversion with a single write and not a
series 
>   > of read-modify-write operations.
>   > 
>   > Also make sure that none of the ADC capable pins stay below 3.3
Volt 
>   > even if they are not used as ADC inputs (see errata for more info).
>   > 
>   > Make sure you configure the pin as ADC input with the pin
configuration 
>   > registers.
>   > 
>   > Regards,
>   > Richard.
>   > 
>   > 
>   > 
>   > 
>   > Sutton Mehaffey wrote:
>   > > Please help us to improve Yahoo! Groups. Take the survey now! 
>   > > <http://v2.decipherinc.com/survey/yahoo/yah05014?list=18>
>   > > I am trying to read a battery voltage (~12V) on AD0 channel 2.
 I have
>   > > a breadboard circuit with a voltage divider that is working
properly
>   > > that gives a reading between 1.8V and 2.3V more or less.  I am
using a
>   > > variable power supply to generate these voltages.
>   > >
>   > > When I connect the 1.8-2.3V to P0.29 (AD0.2), I read CFF (all
10 bits
>   > > high) no matter what.  Can someone tell by the code below if I
have a
>   > > setting wrong?  My PCLK is 12Mhz.
>   > >
>   > >
>   > > AD0CR |= 0x00200000;  // turn on AD0
>   > > AD0CR |= 0x00000400;  // divide 12Mhz clock by 3 (max 4.5Mhz
ADC clk)
>   > > AD0CR |= 0x00000004;  // select channel AD0.2
>   > > AD0CR |= 0x01000000;  // start conversion now
>   > >
>   > > while ((AD0STAT & 0x00000004) == 0);   // DONE2 status bit in
AD0STAT
>   > > result = (AD0DR2 & 0x0000FFC0) >> 6;   // bits 6-15 are result
>   (0-2055)
>   > >
>   > > DONE2 is set, and result is always CFF.
>   > >
>   > > Sutton - dodge1955
>   >
> 
> 
> 
> 
> 
> 
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