PIC18F4520 : LED Blinking : 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes

Forums

Rickey's World :: Discussion Forums :: Discuss and Learn :: PIC Microcontroller Discussion		<< Previous thread \| Next thread >>
PIC18F4520 : LED Blinking


Moderators: Ajay Bhargav, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph, ExperimenterUK, DavesGarage

Author

Post

Karan123

Sun May 31 2009, 03:07AM

Registered Member #14782

Joined: Mon Feb 02 2009, 06:45PM

Posts: 66
Thanked 1 time in 1 posts

Hello,

I am new For PIC MICROCONTROLLER (PIC18F4520) Series.

I have successfully Write Program for Blink LED and Checked on
MPLAB Simulator.

Now I have to Check that with Actual Hardware.

I have Connected

C1 and C2 22 pF and X'Tal of 4.00 MHz

PIN 13 and 14 for Osc.

PIN 32 and 11 to VCC.

PIN 31 and 12 to GND.

RESET Switch ON PIN 1 with GND

LED CONNECTED ON PIN2 RA0.

I have successfully Program HEX file to PIC uC.

But Unable to Blink LED on Actual Hardware

Please Guide me How to Trouble shoot Above Problem?

Karan

Karan

Apex::Code

Sun May 31 2009, 07:30AM

Registered Member #16399

Joined: Thu Mar 12 2009, 02:19AM

Posts: 36
Thanked 9 times in 9 posts

if u r sure of h/w then there must be some problem in s/w
please post s/w

first program to just glow a LED on a port

then program to keep it off

if both work successfully there chud be no prblm with h/w

then to blink..... see that you have enough delay atleast of 1s so that u can see the blinking.....

This post has been thanked 1 time

Karan123

Karan123

Sun May 31 2009, 07:55AM

Registered Member #14782

Joined: Mon Feb 02 2009, 06:45PM

Posts: 66
Thanked 1 time in 1 posts

Thanks for Reply...

I am send to you Circuit and Source

Karan

mplab_first.zip

Karan

Apex::Code

Sun May 31 2009, 08:10AM

Registered Member #16399

Joined: Thu Mar 12 2009, 02:19AM

Posts: 36
Thanked 9 times in 9 posts

the code seems right!!! but some config is missing.......which programmer are u using??? i don't see the config bits set and neither ........... and u need to set port a pins as digital pins bcoz they can act as analog too...

This post has been thanked 1 time

Karan123

Karan123

Sun May 31 2009, 08:39AM

Registered Member #14782

Joined: Mon Feb 02 2009, 06:45PM

Posts: 66
Thanked 1 time in 1 posts

How to Config Bits?

I am using PIC ICSP programmer.

How to change Analog pin to Digital pin?

Waiting your Reply..

Thanks

Karan

Karan

Apex::Code

Sun May 31 2009, 10:35AM

Registered Member #16399

Joined: Thu Mar 12 2009, 02:19AM

Posts: 36
Thanked 9 times in 9 posts

sorry for late reply...........

well u have to configure it through your code which is better than setting config bits thru PICPgm Develop. Programmer every time u burn pgm into PIC.

like in C:

CODE:

#pragma config OSC = XT    /* Sets the oscillator mode to XT for cristal up to 4MHz or HS=>4MHz */

#pragma config WDT = OFF   /* Turns the watchdog timer off */

#pragma config LVP = OFF   /* Turns low voltage programming off */

#pragma config DEBUG = OFF /* Compiles without extra debug code */

.

.

.

.

.

.

.

.

.

many config bits r there which needs to be set rather than leaving it for default....
refer C18 manual in MPLAB-> HELP-> Help Topics
it has all config bit settings explained ..... or u can even refer datasheet under chapter --- 'Special Features' which will be in end chapters of datasheet

next in main() initialize and assign default values, like this:

CODE:

       ADCON1   = 0b00001111;   //all A/D port set as digital 

       TRISA   = 0b0000000;   // output 

        TRISB   = 0b00000000;   //all output 

        TRISC   = 0b10000000;   //all output

        TRISD   = 0b00000000;   //all output 

        TRISE   = 0b00000000;   //all output    

        PORTA      = 0b00000000;   //Initialize port default output state 

        PORTB      = 0b00000000;

        PORTC      = 0b00000000;        

        PORTD      = 0b00000000;

        PORTE      = 0b00000000;        

        INTCON          = 0b00000000;   //disable interrupts

        INTCON3         = 0b00000000;   // disable ext intrpt.

        PIE1            = 0b00000000;

        PIE2            = 0b00000000;

This post has been thanked 1 time

Karan123

Karan123

Sun May 31 2009, 11:25AM

Registered Member #14782

Joined: Mon Feb 02 2009, 06:45PM

Posts: 66
Thanked 1 time in 1 posts

Thanks For Support!!!!!!!!

I have successfully Checked on Own Hardware...

Please check attachment.

I am working for 8051 from last 3 years?
Now move to PIC.

Thanks again,..

Karan

pic18f4520_with_blink_led.rar

Karan

Apex::Code

Sun May 31 2009, 11:32AM

Registered Member #16399

Joined: Thu Mar 12 2009, 02:19AM

Posts: 36
Thanked 9 times in 9 posts

gr8 all d best

This post has been thanked 1 time

Karan123

Tech350

Mon Jun 22 2009, 05:37AM

Registered Member #19049

Joined: Thu Jun 04 2009, 03:07AM

Posts: 29
Thanked 0 times in 0 posts

Hi Karan,

I'm working on a PIC18F8520 for awhile now and I it is similar to your PIC18F4520. I'm using a MikroC IDE and I it is amazing and built for PIC MCUs. Download a trial version of MikroeC from the net and check it out. There are example programs along with the circuit diagram. LED blinking is a very basic code and you shouldn't have so much trouble with it.

In my case a program is something which always converts data into error messages!!

Ajay Bhargav

Mon Jun 22 2009, 03:16PM

Rickey's World Admin

Registered Member #1

Joined: Fri Feb 24 2006, 04:56AM

Posts: 7484
Thanked 1323 times in 1247 posts

Karan, remember when you are using MPlab, i recommend you to use the GUI interface for configuration bits setting of PIC (Configure->configuration bits), just to make sure you did not miss any of the important stuff. Also make sure you have selected the right device before programming and making changes in configuration bits.

and PortA of PIC is analog port by default, it must be configured as Digital before using it as digital I/O port.

best of luck