PWM generation using PIC

[sandhyaram]

Hai...

I want to generat carrier based PWM using PIC 16F877A .... but I don't know about basic also... Mikro C software use for that..... any one help me how to write a program..... and basic...PLEASE...... Thanks..........:!::!::!:

 

[cubanflyer]

You may need to specify the version of basic you plan on using.

 

[Tahmid]

I think he wants a very basic (small and simple) code for mikroC compiler.

 

[engr.waqas]

See mikroc help and look for libraries then click on hardware libraries and then click PWM library ...it has a sample program too

 

[Tahmid]

Hi,
Here is a sample code to generate 40kHz:

//Program to generate 40kHz output at RC2(CCP1) pin
//Microcontroller: Microchip PIC18452
//Language: C
//Compiler: mikroC v8.20
//Programmer: Tahmid

void main (void){
     TRISC = 0;
     PORTC = 0;
     ADCON1 = 7;
     T2CON = 0;
     TMR2 = 0;
     PWM1_Init(40000); //40kHz
     PWM1_Change_Duty(128); //50% duty cycle
// Choose Duty cycle as such:
// PWM_Change_Duty(x);
// x = ( (Duty Cycle in %) / 100) * 255
     PWM1_Start(); //Start PWM
     while (1){ //Loop forever
// Whatever else might be needed to be done while PWM is running
     }
}

Take a look here:
https://www.edaboard.com/threads/169704/#post714600
https://www.edaboard.com/threads/169704/

Hope this helps.
Tahmid.

 

[cubanflyer]

I think he wants a very basic (small and simple) code for mikroC compiler.

Oops, I must had have mis-interpreted the post.

 

[sandhyaram]

Hai...
Thanks for ur reply.... actually i want to control the Z source inverter switches using simple boost PWM method..... so i want to program ...... comparison of sine wave and traingular wave &traingular wave and
DC value it gives the PWM signals to switches..... any one help me.....

 

[alaa1231]

Hello
Tahmid
I tried your code and test them on Proteus but nothing happen and I cant see anything on oscilloscope @channel connected to RC2

 

[Tahmid]

Did you use 18F452? Did you set the proper clock settings, the proper configuration bit settings? It is a simple program and I've tested it - it's all right.

 

[alaa1231]

I dont have pic18f452 and i want to use it on pic16f877a I think no difference is it? and if there is diference can you give me code for pic16f877a?

 

[Tahmid]

It's the same. It should work. Maybe there's some problem in the simulation file. Build the circuit on a breadboard/veroboard/PCB and it'll work.

 

[alaa1231]

---------- Post added at 20:18 ---------- Previous post was at 20:17 ----------

[/COLOR]ok i will try it on breadboard

 

[Tahmid]

Odd. Is this in simulation? Did you actually build the circuit?

 

[alaa1231]

what I asked you before was only in simulation but now I am going to build it in real and try it

---------- Post added at 20:52 ---------- Previous post was at 20:25 ----------

Ok thanks very much tahmid i tried in real and work but why it doesnt work in proteus

 

[Tahmid]

I think there's a problem in your model file for the PIC16F877A.

 

[anybisi]

Hi all,
Quick question can pic16f72 be swapped
For pic16f876?
Thanks

 

[Tahmid]

Depends. It's pin compatible, but has different features. To start off with, the 16F72 has an 8-bit ADC, 16F876 has a 10-bit ADC.

 

[anybisi]

Ok thanks T. Do you know any pic16f72 alternatives?

 

[Tahmid]

Exact replacements, no. But, you can use 16F876 by tweaking the original code. Is it in assembly or high-level language like C or BASIC?

 

[anybisi]

thanks T, its in ASM. Can this be converted to C?