Lpc2000

--- In lpc2000@yahoogroups.com, "soren_t_hansen" <soren_t_hansen@y...>
wrote:
> I have set up the ADC to run in hardware mode, and is sampling at a
> rate of 60 Khz over 4 channels. I use the Keil MCB2130 eval. board,
> which means, that I have a Potmeter connected to my AIN0.
> But when I read my channel 0 in the interrupt method, I keep getting 0
> nomatter what. 
> 
> I have the following setup for my ADC:
> 
> AD0CR	= 0x0023180F;  //AIN0-3, 9 bits @ 60 kHz (=15 Khz pr. channel)
> VICVectCntl0 = 0x00000032;
> VICVectAddr0 = (unsigned long)AD_ISR;
> VICIntEnable |= 0x00040000;
> 
> In my interrupt handler I do the following:
> 
> unsigned int val, chan;
> 
> val = AD0DR;               /* Read A/D Data Register */
> val = (val >> 6) & 0x03FF;	//9 bits - if 10 bits use 0x03FF
> chan = ((AD0DR >> 0x18) & 0x07);
> result[chan] = val;	//Result is a unsigned int array of size 4
> VICVectAddr = 0;		//Reset interrupt	
> 
> I then write the result[0] variable to the serial port to see what the
> result[0] is and always gets 0.
> Has it something to do with my setup of the ADC?
> 
> Best Regards
> Søren Hansen

Solved the problem myself. It turned out that it was yet another error
in the Keil/Hitex documentation. The Pot1 isn't connected to the AIN0
but the AIN1 - therefore it helps a lot taking result[1] instead of
result[0]
Also I seemed to be missing a PINSEL1 |= 0x01000000; due to another
misguiding comment in the Keil example code.

Sorry for the inconvenience

Best Regards
Søren