C code examples needed

[Guest]

i have tried writing some code but it is not worikng so have been looking for some c code example for a pic16f84a or pic16f628a chip but cant find any.

does anyone know where i could find any examples just simple beginners stuff. i tryed seaching google and the forum but no luck. thanks for any help

[dyeatman]

One source is the examples in the PICC\EXAMPLES directory. Your Google
apparently is broken because I just Googled for 16F84 and found a number
of tutorials and lots of other example code. This looks like a good one:

http://www.mstracey.btinternet.co.uk/pictutorial/picmain.htm

[Guest]

that code has example that are in assembler and i was after ones in c.

[PCM programmer]

To use Google to search for CCS code, search for a keyword or other
directive that's unique to CCS. For example "#use delay" is only used
by CCS. Try the following search strings in Google. (including the quotes).

[jecottrell]

Broad questions don't usually elicit much of a response. Try narrowing it down for us.

Are you using the CCS compiler? (What version?)

Post some of your code that isn't working. (Don't be afraid... I find the more butchered my examples that I post, the more help I get.)

What exactly are you trying to do with your code? Flash and LED?

What hardware are you using to test your code?

Sign up. That will allow you to edit posts, etc. It also shows the pros around here that you're not just a drive by poster....

Good luck,

John

[umka]

ok here is the code i was trying to use so when there is a high on porta the corisponding port b would light an led. i am just after really simple stuff as i am new to pic and ccs compiler and just feeling my way around for now. i still cant really find anything useful code on the net for the chips i have i may just order a 16f877a. would that be a good chip to get?

code for led

#include <16f84a.h>
#fuses xt,nowdt,put,noprotect

#byte PORTA =0x05
#byte PORTB =0x06
#byte TRISA =0x85
#byte TRISB =0x86


void main(void)
{
TRISB=0x00; // make portb all outputs
TRISA=0x1f; // make porta all inputs

while(1) // always
{
PORTB=PORTA;
}
}


cheers mike

[treitmey]

Yes the 16f877a is a good chip. I use it in 80% of my projects.
- - -
Alot of times its better not to use fast_io.
You were trying to use it without the fast_io directive.
you also don't have a #use delay(clock) statement
Will this work?? I tested it with a 16F877 on PIC DEM 2 plus with 10MhZ

[umka]

the above code does not compile sorry treitmey. i have changed the code some more to try and make it even simpler.

#include <16f84a.h>
#fuses xt,nowdt,put,noprotect
#use delay(clock=4000000)

void main(void)
{
while(1) // always
{
if (pin_b2 == 1)
output_high(pin_a2);
else if (pin_b2 == 0)
output_low(pin_a2);
}
}

this compiles and loads but doesnt do anything when i try to use it on a breadbord.

[umka]

ok i have some action.

heres the code for the blinking led

[PCM programmer]

One tip. You don't need to set the TRIS. Because you're using the CCS
output_low() and output_high() functions, the compiler will set the TRIS
for you. This is the standard operating mode of the compiler. You can
specify fast i/o mode with a #use statement, and then use a set_tris_a()
statement, but it's not necessary. It's easier to leave the compiler in
standard i/o mode and let it handle setting the TRIS.

[treitmey]

Should have known better then to try and just switch 16F877 to 16F84A
try this

[umka]

cool cheers for the help PCM programmer and treitmey

i have the switchs working now had too add a line to the code to get it working properly so they could be toggled.