Lpc2000

--- In lpc2000@yahoogroups.com, "stiffsoft" <stiffsoft@s...> wrote:
> Hello,
>    Does anyone have any C code that actually reads the MCB2130 
> hardware ADC on AIN1 (the potentiometer tied to P0.28) they would be 
> willing to share?  I have tried the Keil code, the Hitex example
> code, manipulating bit values, etc., for most of 2 days and cannot 
> get ADC to return a value that I can display via COM1 on the 
> MCB2130.  The code I have been exploring uses hardware continuous 
> conversions rather that software interrupt driven conversions.  I 
> really thought the hardware conversion would be easier to implement 
> than the software.
>    I verified that the voltage varies at P0.28 with a DMM when I 
> adjust the pot, but I get nothing but 0 from AD0DR.  
>    I contacted Keil via telephone and didn't get much help (other
> than suggesting I run it in the simulator -- more stuff to learn).  
> I also sent my source code to their support center, but have not 
> received a response.
>    Any suggestions (or simple code hints) will be greatly 
> appreciated.
> 
> Steve Stiff

Have you made sure that the J2 jumper is set? Also make sure that you
use the lpc213x.h instead of the lpc21xx.h 
I'm using the following code as a small example:

AD0CR |= 0x01200000;                      /* Start A/D Conversion */
  do {
    val = AD0DR;                            /* Read A/D Data Register */
  } while ((val & 0x80000000) == 0);       /* Wait for end of A/D
Conversion */
  AD0CR &= ~0x01000000;                     /* Stop A/D Conversion */

Is this the same as you have?

Best Regards
Søren Hansen