pic12F683 , gpio.5 not accessible...

[mackrackit]

GPIO = %000000 ' outputs low << very important it seems!!

I just want to use it as a button, or serial out, but no can do so far, it gives zEro volts, and react to nothing as a digital pin...unless I got a stupid mistake in my settings.

Try setting as an input.

GPIO = %000001

[flipper_md]

well, I went aroudn trying pretty much every combination possible...

TRISIO = %101100
GPIO = %100001

TRISIO = %101100
GPIO = %000001

TRISIO = %001100
GPIO = %000001

TRISIO = %101100
GPIO = %000000

there's just no way to turn on a LEd on that GPIO.5

reading the spec sheet, it's a TLL cmos like all other ports... I can't see the missing link :<


any working code that use that port as digital IO?


tnx Dave for the quick reply

[Archangel]

flipper_md
>>well, I went around trying pretty much every combination possible...

TRISIO = %101100 <font color=red>= Ports 2,3,5 AS INPUTS 0,1,4 as outputs</font color>
GPIO = %100001 GPIO sets ports high or low if outputs, not if inputs. . . .

TRISIO = %101100
GPIO = %000001

TRISIO = %001100 Here port.5 is an output, 2-3 as inputs
GPIO = %000001 Port zero is output high

TRISIO = %101100
GPIO = %000000

there's just no way to turn on a LEd on that GPIO.5

reading the spec sheet, it's a TLL cmos like all other ports... I can't see the missing link :<


any working code that use that port as digital IO?

http://ww1.microchip.com/downloads/e...Doc/41211C.pdf

[Darrel Taylor]

; settings in INC file
' set in INC file => device pic12F683, intrc_osc_noclkout, wdt_off, mclr_off, protect_off ; FOR INSTANT INTERRUPT

If you're using Instant Interrupts, the program has to be assembled with MPASM.

Look at the __CONFIG line in the 12F683.inc file, not the device line.
<br>

[Archangel]

If you're using Instant Interrupts, the program has to be assembled with MPASM.

<br>

Hi Darrel,
I thought he was as he did not report any compiler errors, doesn't PM choke on DT_I.I.?

[Darrel Taylor]

Yes, PM will definately "choke" on Instant Interrupts.

What I'm saying is that ... since it appears he's using MPASM, he's looking at the wrong configs.
<br>

[flipper_md]

ohh you got a point here!

Modified the __config line and it's definitely using it...

__config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF

but then I get
ICDWarn0033: MPLAB ICD 2 does not support programming this device if both the internal oscillator and internal MCLR are selected. You may continue programming, but you are encouraged to cancel, reconfigure your device, and try again.
ICD0200: Operation Aborted (Warning 32).

so basically I assume I cannot have all pins as digital IO.

still It's better for me to set MCLRE on and get GPIO.4/5 working, and leave MCLRE pin alone.
Unless there's a way to bypass this...

It's also great to know which compiler i"m using LOL

edit: setting MCLRE_ON I can get access to GPIO 4 and 5 now..
Still I wonder if it's possible to get rid of MCLR