12F675 gp0 led blinks - Not run -Please, they help

[adilson_gutierres]

hello,
I am trying to make my first program with the 12f675, but it does not function. I am using the copilador pcm 3.178, hardware: pin_1 = +5V,
pin_8 = gnd, pin_7 to the K led, the Anode Led on to an electrical resistance of 390R on to Vcc(5V).
Already I made the program in ASM and functions. therefore my pic is good.
Please, they help .

grateful,

Gutierres.

code is:

#include <12f675.h>
#fuses INTRC_IO,PUT,NOWDT,NOPROTECT,NOMCLR, BROWNOUT
#use delay(clock=4000000)

#use fast_io(a)

#byte ADCON0 = 0x1F
#byte ANSEL = 0x9F
#byte CMCON = 0x19

#rom 0x3ff = {0x3470} // input the calibration code

main()
{

ADCON0 = 0; // ADC off
ANSEL = 0; // GPIO pins 0,1,2 and 4 set to all digital
CMCON = 7; // Comparators off

//setup i/o
set_tris_a(0b111110); //GP0 output

while(true)
{
delay_ms(100);
output_high(pin_a0); //GP0 high
delay_ms(100);
output_low(pin_a0); //GP0 low
}
}

[Felix Althaus]

Hi

I'm working with the 12F675 for the first time too...

Perhaps the problem is in the following line:
//setup i/o
set_tris_a(0b111110); //GP0 output

You only use 6 bits in your binary number nut TRISIO is a 8Bit register. I don't know how (from left or from right) the compiler fills the other two bits, so perhaps the TRIS bits of GP0 and GP1 are 1 -> input

I would write:

set_tris_a(0b11111110); // only GP0 = output

may this helps
mfg
Felix

[adilson_gutierres]

Hi Felix,
is not this the problem. you a binary minor can use.
I made the alteration, but also it did not function.
I continue with the problem
...

[Ttelmah]

[adilson_gutierres]

I discovered that using external crystal it functions ( _XT_OSC)
I made a reading from memory with my programmer, and noticed that the address 3ff is blank.
my programmer alone records until the address 3fe( PICSTART PLUS ver 3.11.0).
I do not know more what to make.

[Felix Althaus]

Which programmer do you use?

If PicStart+ with MPLAB, perhaps there is a setting option (in 6.2 there is one) where you can select which regions the programmer programs. Perhaps the option "calibration data" is deactivated (?)

mfg
Felix

[adilson_gutierres]

Tks Felix,
I am using picstart+ and MPLA�B6.30.
I disactivated "calibration memory", but also I did not have success. This is very strange.
To function I had that to substitute in .hex the lines of "call 0x3ff" and "movwf 0x10" for "NOP". In this case the 12f675 uses calibration 0x80 that he is default.
If to leave without the changes when to execute "call 0x3ff" it does not go to find "retlw xx" provoking one reset and a perpetual Loop of error
I do not have more what to make to solve this case.
If somebody to know, helps me.

[Felix Althaus]

Hi

The "calibration memory" should be ACTIVATED!!
What happens, if you let blink another pin (or the whole port)?

mfg
Felix