Hello,
I was wondering if I could get a little help with a problem I have. I am trying to program a counter on an AVR microcontroller, and the code I have is below, but all I am getting out is zero's on the 4 seven segment displays.
I am pretty new to C programming, so if anyone can spot any errors, that would be great!
Thanks for any help pr advice.Code:#include <avr/io.h> #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <avr/interrupt.h> void delay (unsigned int size) { unsigned int i; for (i = 0; i < size; i = i + 1); } void setup_hardware (void) { DDRA = 0xFF; DDRB = 0xFF; TCCR0 = 0x03; TIFR = 0x00; TIMSK = 0x02; //SREG = SREG | 0x80; sei(); } const unsigned char enable [4] = {0x10, 0x20, 0x40, 0x80}; const unsigned char pattern [10] = {0x7E, 0x0C, 0xB6, 0xCC, 0xDA, 0xFA, 0xFE, 0xFE, 0xCE}; #define DISPLAY_SIZE 4 unsigned char my_display [DISPLAY_SIZE]; unsigned char led_counter = 0; #define POSITION_0 0 #define POSITION_1 1 #define POSITION_2 2 #define POSITION_3 3 int main (void) { unsigned int count = 0; setup_hardware (); unsigned char mins_units = 0, mins_tens = 0, hrs_units = 0, hrs_tens = 0; //unsigned char hours = 0; //unsigned int mins = 0; mins_units = ((count%3600)/60)%10; mins_tens = ((count%3600)/60)/10; hrs_units = (count/3600)/10; hrs_tens = (count/3600)%10; my_display[POSITION_0] = pattern[hrs_tens]; my_display[POSITION_1] = pattern[hrs_units]; my_display[POSITION_2] = pattern[mins_tens]; my_display[POSITION_3] = pattern[mins_units]; while(1) { count = count + 1; if (count == 43199) { count = 0; } // load_display (count); delay(1000); } } ISR(TIMER0_OVF_vect) { //clear interrup flag???...done by hardware //refresh(); PORTB = 0x00; //Turns of all LEDs PORTA = my_display [led_counter]; //Sets segments for the LED PORTB = enable [led_counter]; //Turn the LED on led_counter = led_counter + 1; //Move onto the next LED if (led_counter == DISPLAY_SIZE) { led_counter = 0; } }
Sean
Originally Posted by Salem
