TMRO and switch function in MikroC

mikroc 7 segment display

hi. I have this simple code which supposed to turn on 7-segment display (common anode) counting 0-9. i'm using switch function and the TMR0. the problem is i can't make it count. it stuck at 8. i guess the problem is my TMRO and how to count it so it control the switch function. Any help from the C gurus out there will be appreciated. still learning how to use C. here is the code. thnx in advance.

unsigned cnt;
unsigned cnt1;
void interrupt() {
cnt++;

if (cnt==400)
{cnt=0;
cnt1=cnt1++;} // Increment value of cnt on every interrupt
INTCON = 0x20;
TMR0 = 96; // Set T0IE, clear T0IF
}//~

void main() {
OPTION_REG = 0x84; // Assign prescaler to TMR0
TRISb = 0; // PORTB is output
PORTb = 0xFF; // Initialize PORTB
TMR0 = 0x96;
INTCON = 0xA0; // Enable TMRO interrupt
cnt = 0;
cnt1=0; // Initialize cnt

do {
if (cnt1<0x09)
switch (cnt1){
case 0: portb = 0x81;
case 1: portb = 0xf3;
case 2: portb = 0x49;
case 3: portb = 0x61;
case 4: portb = 0x33;
case 5: portb = 0x25;
case 6: portb = 0x05;
case 7: portb = 0xf1;
case 8: portb = 0x01;
case 9: portb = 0x31;
default: portb =0x81;
}
cnt1 = 0;
// Reset cnt
} while (1);

}//~!

mikroc tmr0 example

Hi,

Change this line first:

if (cnt1<0x09) with if (cnt1<0xa)... but still not good...

for your inspiration:


//Declarations------------------------------------------------------------------
//--------------------------------------------------------------end-declarations
/*
* Project name:
Display_1 (The 'Hello World' example for the 7Seg. display)
* Copyright:
(c) Mikroelektronika, 2005.
* Description:
This code demonstrates how to display number on one 7-segment display
(common cathode). Display is connected to PORTB (RB0..RB7, segment A to
RB0, segment B to RB1, etc); common cathode is connected to the pin RA1 on
PORTA. Number is incremented every 1s.
* Test configuration:
MCU: P16F877A
Dev.Board: EasyPIC3
Oscillator: HS, 08.0000 MHz
Ext. Modules: -
SW: mikroC v6.0
* NOTES:
None.
*/
unsigned short i;



//-------------- Returns mask for common cathode 7-seg. display
unsigned short mask(unsigned short num) {
switch (num) {
case 0 : return 0x3F;
case 1 : return 0x06;
case 2 : return 0x5B;
case 3 : return 0x4F;
case 4 : return 0x66;
case 5 : return 0x6D;
case 6 : return 0x7D;
case 7 : return 0x07;
case 8 : return 0x7F;
case 9 : return 0x6F;
} //case end
}//~




void main() {
INTCON = 0; // Disable PEIE,INTE,RBIE,T0IE
PORTA = 0;
TRISA = 0;
PORTB = 0;
TRISB = 0;
do {
for (i = 0; i<=9u; i++) {
PORTA = 0;
PORTB = mask(i);
PORTA = 2;
Delay_ms(1000);
}
} while (1); //endless loop
}//~!

Hi

I wrote this code to count down, but it stops at zero.it counts from 9 to 0 but stop at zero.No looping.

do{
for (i=9; i>=0; i--) { ///unsigned
PORTA = 0;
PORTB = mask(i);
PORTA = 2; ///5V to pin RA1
Delay_ms(1000);}
}while (1); //endless loop


Thanks in advance

Hi,
Change it to:

Hope this helps.
Tahmid.

---------- Post added at 14:52 ---------- Previous post was at 14:49 ----------

Or,

Hope this helps.
Tahmid.

---------- Post added at 14:54 ---------- Previous post was at 14:52 ----------

Try it. The problem is i is declared as unsigned. So, when it equals 0, the condition in the for loop is still valid, however, it can't be decremented. So, you see.....