DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

HAN — Mon, 01 Dec 2008 15:47:54 GMT

our problem,

using demo9s08qg8 board ,control led1, led2 when ever read from adc value its compare X value accorading led1 on,led2 off

i write sample program

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC9S08QG8.h> /* include peripheral declarations */

#define LED1 PTBD_PTBD6
#define LED1_DDR PTBDD_PTBDD6
#define LED1_MASK PTBD_PTBD6_MASK
#define LED2 PTBD_PTBD7
#define LED2_DDR PTBDD_PTBDD7
#define LED2_MASK PTBD_PTBD7_MASK

#define ON 1
#define OFF 0

void ADC_Init(void)
{

// set up adc
ADCSC1=0x63; // all channels selected disables the ADC


ADCSC2=0x00;   // select software trigger

ADCCFG=0x90;      // bus clock


APCTL1=0x08;

           //APCTL1 = 0x00; // Disable all pins as ADC     }inputs
}

void main(void)

{

ADC_Init();   // Microcontroller initialization

for (; {

       __RESET_WATCHDOG(); // Kicks the dog

          while(ADCSC1_COCO==1);


       {

         if (ADCRL > 0x00) // ATD Output => 0xBF
         {
           PTBDD_PTBDD6=1;
         }
         else

          {
            PTBDD_PTBDD7=1;

         }

    }// End While

}// Loop forever

}//end main(void)

interrupt 19 void ADC_ISR (void)

{

ADCRL=ADCSC1_ADCH;

ADCSC1_AIEN=0;
}
pls check this coding correct or not

Re: DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

Ake — Mon, 01 Dec 2008 20:08:06 GMT

Hi,

I looked thru your code, without understanding what it did, but one thing caught my attention.

In the interrupt routine you wrote:

ADCRL=ADCSC1_ADCH;

but the ADCRH:L registers are where the results appear. So you are not allowed to do any writing into them.

Regards,

Ake

Re: DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

HAN — Wed, 18 Feb 2009 17:02:45 GMT

k. thank you.. i need better understanding C code Using DEMO9SQG8... any reference for solve the problem.

8-bit MicrocontrollersのトピックRe: DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

Re: DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel

Re: DEMO9SO8QG8 -- TESTING WITH SINGLE ADC channel