[SOLVED] How to tell if a MCU is damaged

[tigerclaw]

dose this code seem ok to you guys?

#include <p18f2550.h>
#include <timers.h>
#include <delays.h>
#include <adc.h>
#include <stdlib.h>

#pragma config FOSC = INTOSCIO_EC //Internal oscillator,
#pragma config WDT = OFF //Disable watchdog timer

#define DIGIT1 LATCbits.LATC0
#define DIGIT2 LATCbits.LATC6
#define DIGIT3 LATCbits.LATC7
#define revdigit LATCbits.LATC1

//
// This function finds the bit pattern to be sent to the port to display a number
// on the 7-segment LED. The number is passed in the argument list of the function.
//



unsigned char DisplayV(unsigned char noV)
{
unsigned char PatternV;
unsigned char SEGMENTV[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,
0x7D,0x07,0x7F,0x6F};
PatternV = SEGMENTV[noV]; // Pattern to return
return (PatternV);
}


//
// Start of MAIN Program
//


void main()

{

unsigned char Msd, Midle, Lsd, tmr, rev;
unsigned long int Cnt;
unsigned char delay = 200;

TRISC = 0; // PORTC are outputs
TRISB = 0; // PORTC are outputs
DIGIT1 = 0; // Disable digit 1
DIGIT2 = 0; // Disable digit 2
DIGIT3 = 0; // Disable digit 3
revdigit = 0;
LATCbits.LATC0 = 0;

for(;
{

OpenADC( ADC_FOSC_RC &
ADC_RIGHT_JUST &
ADC_2_TAD,
ADC_CH0 &
ADC_INT_OFF &
ADC_VREFPLUS_VDD &
ADC_REF_VDD_VREFMINUS , 2 );

ConvertADC();
while(BusyADC());
Cnt = ReadADC(); //5V = 1022 0.005v = 1 vstah mezi rychlosti je 3.785(maxV 270km/h)
Cnt = Cnt / 3.785;
//Cnt = 129;

//
//OpenTimer0( TIMER_INT_OFF &
//T0_8BIT &
//T0_SOURCE_INT &
//T0_PS_1_256 );
//

if(Cnt > 99) goto xxx;

else if (Cnt < 100) goto xx;

else if (Cnt < 10) goto x;// ukazuje se mi stejne nula pred jednomistnim cilsem, musim mrknout na Lsd

xxx:
Msd = Cnt / 100; // MSD digit
PORTB = DisplayV(Msd); // Send to PORTB
DIGIT1 = 1; // Enable digit 1
Delay1KTCYx(delay); // Wait a while
DIGIT1 = 0; // Disable digit 1
xx:

Midle = Cnt % 100;
Midle = Midle / 10;
PORTB = DisplayV(Midle);
DIGIT2 = 1;
Delay1KTCYx(delay);
DIGIT2 = 0;
Midle = Midle * 10;
x:

Lsd = Cnt % 10; // LSD digit
PORTB = DisplayV(Lsd); // Send to PORTB
DIGIT3 = 1; // Enable digit 2
Delay1KTCYx(delay); // Wait a while
DIGIT3 = 0; // Disable digit 2
//
//DIGIT1 = 1;
//DIGIT2 = 1;
//DIGIT3 = 1;
//PORTB = 0x7f;
//Delay1KTCYx(200);
//DIGIT1 = 0;
//DIGIT2 = 0;
//DIGIT3 = 0;

CloseADC();

// Engne Rev
//ConvertADC();
//while(BusyADC());
//rev = ReadADC();
//rev = rev * 4.892;

// if(rev >= 1000);
//
// PORTB = 0x0FF;
// PORTC = 0x0D;
// revdigit = 1;
// Delay1KTCYx(delay);
// revdigit = 0;
// else if (rev > 1300) break;
//
// else if (rev > 1600) break;
}
}



It should display a value 0-270 on a 3x 7seg displays(Anode) connected directly to port B pins, based on the voltage on the analog input chanel 0. But the displays show two zeros, i think the problem is the ADC conversion bicose when i specify the value of Cnt directly it shows properly on the displays.

Any sugestions?

---------- Post added at 19:21 ---------- Previous post was at 19:18 ----------

Oh and again in Proteus it works perfectly.

 

[tigerclaw]

NWM i had the ADC conversion settings wrong