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I mus be stupide but..

Begining with pic programing in C

The following prog works on a pic16f84A #include /***** 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??

Reply to
Andre
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Le 14/04/2012 18:09, Andre a écrit :

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

Reply to
Andre

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
Reply to
Wolfgang Mahringer

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 ).

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) ?

-- Les Cargill

Reply to
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

Reply to
Andre

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
Reply to
John Temples

That's was the problem. I configured COMCON and miracle .. Many thanks. André

Reply to
Andre

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