I mus be stupide but..

Begining with pic programing in C

The following prog works on a pic16f84A
#include <htc.h>
/***** CONFIGURATION *****/
__CONFIG(0x3F61);
/***** MAIN PROGRAM *****/
void main()
{
// Initialisation
TRISB = 0b00000000;
PORTB = 0b11110000;
for (;
{
// turn on LED only if button pressed
if ( RA0 == 1 )
PORTB = 0b000011;
else
PORTB = 0b110000;

}
// repeat forever
}

But the read RA0 never occurs on a pic16f627
Diplay is allways 0b110000

I am using picc ( lite ) from command line or via a Makefile
picc --warn=9 --chip=16f627a less2.c
BTW: if I use --strict, it refuse to compile ( to many errors -- FROM
the included file /usr/local/hitech/picc/9.8/include/pic16f627.h ) ???

Tested on a Vellman kit K8048 ( here a VM111 as I buy it fully monted )

It gives the same results when using MPlab??

Le 14/04/2012 18:09, Andre a écrit :
> Begining with pic programing in C
>
> The following prog works on a pic16f84A
> #include <htc.h>
> /***** CONFIGURATION *****/
> __CONFIG(0x3F61);
> /***** MAIN PROGRAM *****/
> void main()
> {
> // Initialisation
> TRISB = 0b00000000;
> PORTB = 0b11110000;
> for (;
> {
> // turn on LED only if button pressed
> if ( RA0 == 1 )
> PORTB = 0b000011;
> else
> PORTB = 0b110000;
>
> }
> // repeat forever
> }
>
> But the read RA0 never occurs on a pic16f627
> Diplay is allways 0b110000
>
> I am using picc ( lite ) from command line or via a Makefile
> picc --warn=9 --chip=16f627a less2.c
> BTW: if I use --strict, it refuse to compile ( to many errors -- FROM
> the included file /usr/local/hitech/picc/9.8/include/pic16f627.h ) ???
>
> Tested on a Vellman kit K8048 ( here a VM111 as I buy it fully monted )
>
> It gives the same results when using MPlab??

BTW: I am using PikDev to prog the chip.

A similar prog in assembler works, so it doesn't seems to be the chip
nor the programmer.
André
Many thanks in advances

Hi Andre,

In order to use a PORTA pin like RA0, you should
also setup TRISA.
Additionally, the 16f62x has a CMCON register which needs
setup, if you want to use RA0..3.

Have a look in the processor's datasheet.

However, I can say nothing about the PICC compiler...I use CC5X.

HTH,
Wolfgang


--
From-address is Spam trap
Use: wolfgang (dot) mahringer (at) sbg (dot) at

Andre wrote:
> Begining with pic programing in C
>
> The following prog works on a pic16f84A
> #include <htc.h>
> /***** CONFIGURATION *****/
> __CONFIG(0x3F61);
> /***** MAIN PROGRAM *****/
> void main()
> {
> // Initialisation
> TRISB = 0b00000000;
> PORTB = 0b11110000;
> for (;
> {
> // turn on LED only if button pressed
> if ( RA0 == 1 )
> PORTB = 0b000011;
> else
> PORTB = 0b110000;
>
> }
> // repeat forever
> }
>
> But the read RA0 never occurs on a pic16f627
> Diplay is allways 0b110000
>

What setup is required to make RA0 an input on a
pic16f627? Does the button press actually change the state
of RA0? ( put a scope on it, in other words ).


> I am using picc ( lite ) from command line or via a Makefile
> picc --warn=9 --chip=16f627a less2.c
> BTW: if I use --strict, it refuse to compile ( to many errors -- FROM
> the included file /usr/local/hitech/picc/9.8/include/pic16f627.h ) ???
>


Are you sure your path points you to the right compiler? This
sounds a little like you don't have the toolchain set up
correctly.

Otherwise...

??? really? I'd find a forum or send their support an
email. Is there another #include that pic16f627.h depends on?


Do their #includes include other #includes, or are you expected
to do that for them?

Does pic16f627.h have a #if _PIC16F627_H_ at the top ( and the
appropriately placed #endif at the bottom) ?


> Tested on a Vellman kit K8048 ( here a VM111 as I buy it fully monted )
>
> It gives the same results when using MPlab??

--
Les Cargill

Le 14/04/2012 18:31, Les Cargill a écrit :
> Andre wrote:
>> Begining with pic programing in C
>>
>> The following prog works on a pic16f84A
>> #include <htc.h>
>> /***** CONFIGURATION *****/
>> __CONFIG(0x3F61);
>> /***** MAIN PROGRAM *****/
>> void main()
>> {
>> // Initialisation
>> TRISB = 0b00000000;
>> PORTB = 0b11110000;
>> for (;
>> {
>> // turn on LED only if button pressed
>> if ( RA0 == 1 )
>> PORTB = 0b000011;
>> else
>> PORTB = 0b110000;
>>
>> }
>> // repeat forever
>> }
>>
>> But the read RA0 never occurs on a pic16f627
>> Diplay is allways 0b110000
>>
>
> What setup is required to make RA0 an input on a
> pic16f627? Does the button press actually change the state
> of RA0? ( put a scope on it, in other words ).
>
>
>> I am using picc ( lite ) from command line or via a Makefile
>> picc --warn=9 --chip=16f627a less2.c
>> BTW: if I use --strict, it refuse to compile ( to many errors -- FROM
>> the included file /usr/local/hitech/picc/9.8/include/pic16f627.h ) ???
>>
>
>
> Are you sure your path points you to the right compiler? This
> sounds a little like you don't have the toolchain set up
> correctly.
>
> Otherwise...
>
> ??? really? I'd find a forum or send their support an
> email. Is there another #include that pic16f627.h depends on?
>
>
> Do their #includes include other #includes, or are you expected
> to do that for them?
>
> Does pic16f627.h have a #if _PIC16F627_H_ at the top ( and the
> appropriately placed #endif at the bottom) ?
>
>
>> Tested on a Vellman kit K8048 ( here a VM111 as I buy it fully monted )
>>
>> It gives the same results when using MPlab??
>
> --
> Les Cargill
Many thanks.

I don't use MPlab for this as it doesn't support the K8048 programmer.
When I use it, I can upload the .hex file into PikDev and then progrem
the chip
But Mplab use picc.
And rememeber tha the same prog work with a pic16f84a ??
I don't have a osciloscope ( Helas ) I am retired and oding this only
for fun ;-)))
I will be looking at your suggestions asap, my wife's calling ;-))
Andre

On 2012-04-14, Andre <> wrote:
> The following prog works on a pic16f84A

> if ( RA0 == 1 )

> But the read RA0 never occurs on a pic16f627

RA0 is an analog pin by default. Analog pins cannot be used as
digital inputs. You must disable the analog features on the pin (the
comparator).

--
John W. Temples, III

Le 14/04/2012 20:03, John Temples a écrit :
> On 2012-04-14, Andre<> wrote:
>> The following prog works on a pic16f84A
>
>> if ( RA0 == 1 )
>
>> But the read RA0 never occurs on a pic16f627
>
> RA0 is an analog pin by default. Analog pins cannot be used as
> digital inputs. You must disable the analog features on the pin (the
> comparator).
>
That's was the problem. I configured COMCON and miracle ..
Many thanks.
André