Hi,
I am new to PIC microcontrollers.
I am trying to write numbers 0-9 in a seven segment display(common cathode)through a PIC16F628.
I coded,compiled and downloaded the program.
But what i observed is that 'e' segment never glows.I checked the circuit and its proper.
I have connected RB0-a, RB1-b ...... RB6-g. So RB4 is never getting 'High'.
My C code is pasted below. What can be the reason?
I have few queries:
1) In some sample code i have seen changing the register bank for configuring the port and again changing it before writing to the port. Is it necessary? if so what is the reason.
2) Is there anything wrong in connecting MCLR (pin#4) directly to Vdd(pin#14).
3) At first the 7-segment display was connected directly to the port pins and the cathode was connected to GND through a 330 Ohm resistor. Then the Microcontroller was behaving in a strange way. Then i changed the circuit with 7 different resistors for each segment. After that it was okay. Now my doubt is,anyway i am connecting a resistor in series, then how can there be a difference between these two connections?
#include <pic.h>
#include <HTC.h>
__CONFIG(0x3FF0);
void delay(void);
void main(void) {
TRISB = 0x00;
while (1)
{
PORTB = 0x3F; // Equal to 0
delay();
PORTB = 0x06; // Equal to 1
delay();
PORTB = 0x5B; // Equal to 2
delay();
PORTB = 0x4F; // Equal to 3
delay();
PORTB = 0x66; // Equal to 4
delay();
PORTB = 0x6D; // Equal to 5
delay();
PORTB = 0x7D; // Equal to 6
delay();
PORTB = 0x07; // Equal to 7
delay();
PORTB = 0x7F; // Equal to 8
delay();
PORTB = 0x6F; // Equal to 9
delay();
}
}
void delay(void) {
unsigned int i,j,k;
for (i=0; i<100; i++)
{
for (j=0; j<1000; j++)
k=j; //just to waste one cycle
}
}
I am new to PIC microcontrollers.
I am trying to write numbers 0-9 in a seven segment display(common cathode)through a PIC16F628.
I coded,compiled and downloaded the program.
But what i observed is that 'e' segment never glows.I checked the circuit and its proper.
I have connected RB0-a, RB1-b ...... RB6-g. So RB4 is never getting 'High'.
My C code is pasted below. What can be the reason?
I have few queries:
1) In some sample code i have seen changing the register bank for configuring the port and again changing it before writing to the port. Is it necessary? if so what is the reason.
2) Is there anything wrong in connecting MCLR (pin#4) directly to Vdd(pin#14).
3) At first the 7-segment display was connected directly to the port pins and the cathode was connected to GND through a 330 Ohm resistor. Then the Microcontroller was behaving in a strange way. Then i changed the circuit with 7 different resistors for each segment. After that it was okay. Now my doubt is,anyway i am connecting a resistor in series, then how can there be a difference between these two connections?
#include <pic.h>
#include <HTC.h>
__CONFIG(0x3FF0);
void delay(void);
void main(void) {
TRISB = 0x00;
while (1)
{
PORTB = 0x3F; // Equal to 0
delay();
PORTB = 0x06; // Equal to 1
delay();
PORTB = 0x5B; // Equal to 2
delay();
PORTB = 0x4F; // Equal to 3
delay();
PORTB = 0x66; // Equal to 4
delay();
PORTB = 0x6D; // Equal to 5
delay();
PORTB = 0x7D; // Equal to 6
delay();
PORTB = 0x07; // Equal to 7
delay();
PORTB = 0x7F; // Equal to 8
delay();
PORTB = 0x6F; // Equal to 9
delay();
}
}
void delay(void) {
unsigned int i,j,k;
for (i=0; i<100; i++)
{
for (j=0; j<1000; j++)
k=j; //just to waste one cycle
}
}
