12F629 basics (Assembler runs - CCS don't)

[paco]

Hi all.

I have a problem, i don't use PIC12F629 from years and i have a program to migrate to CCS.... but i get a problem probably in configuration.

Why this code doesn't work? (i attach the assembler code that it works compiling with Mplab. I have check that both .hex files can be writed into the PIC with IcProg o WinPic800).

Thanks.
paco

//*********************
#include <12F629.h>

#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOCPD //No EE protection
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCLR //Master Clear pin enabled
#FUSES PUT //Power Up Timer
#FUSES BROWNOUT //Reset when brownout detected

#use delay(clock=4000000)


void main()
{

disable_interrupts(GLOBAL);

setup_comparator(NC_NC_NC_NC);
set_tris_a(0x24); //00011000 a3 and a4 as inputs
port_a_pullups(FALSE);

while (true)
{
output_high(PIN_A5);
delay_ms(100);
output_low(PIN_A5);
delay_ms(100);
}

}
//*********************



;*********************
;Assembler... it works!

list P=12f629
#include <P12F629.inc>
radix dec
__config H'31C4' ;same fuses config than CCS code above.

PDel0 EQU 020H
PDel1 EQU 021H
rojo equ 0x05

ORG 0x00
goto inicio
ORG 0x04

inicio

;**************** BANCO 0 *******************
bcf STATUS,RP0 ;bank 0
clrf GPIO
movlw 07h ;111
movwf CMCON ;GP0/1/2 comparators configured as I/O
;**************** BANCO 1 *******************
bsf STATUS,RP0 ;bank 1

; call 3FFh
; movwf OSCCAL ; if activate doesn't works

movlw b'00011000'
movwf TRISIO ; GP0/1/2/5 output GP3/4 input

movlw 0
movwf WPU ;disable pull ups

bcf STATUS,RP0
;******************volvemos al banco

clrf GPIO

principal

bsf GPIO,rojo ;GP5 red led on
call Del500 ;wait 0.5s
bcf GPIO,rojo ;GP5 red led off
call Del500 ;wait 0.5s

goto principal

;-------------------------------------------------------------
; Code generated by PDEL ver 1.0 on 04/04/2005 at 19:39:51
; Description: Waits 500000 cycles
;-------------------------------------------------------------
Del500 movlw .239 ; 1 set number of repetitions (B)
movwf PDel0 ; 1 |
PLoop1 movlw .232 ; 1 set number of repetitions (A)
movwf PDel1 ; 1 |
PLoop2 clrwdt ; 1 clear watchdog
PDelL1 goto PDelL2 ; 2 cycles delay
PDelL2 goto PDelL3 ; 2 cycles delay
PDelL3 clrwdt ; 1 cycle delay
decfsz PDel1, 1 ; 1 + (1) is the time over? (A)
goto PLoop2 ; 2 no, loop
decfsz PDel0, 1 ; 1 + (1) is the time over? (B)
goto PLoop1 ; 2 no, loop
PDelL4 goto PDelL5 ; 2 cycles delay
PDelL5 goto PDelL6 ; 2 cycles delay
PDelL6 goto PDelL7 ; 2 cycles delay
PDelL7 clrwdt ; 1 cycle delay
return ; 2+2 Done
;-------------------------------------------------------------

END


;*********************

[PCM programmer]

What is your version of the CCS compiler ? Look for the version
number at the top of the .LST file. The .LST file is in your project
folder. The version will be a number such as 3.191, 3.249, etc.

[paco]

CCS PCM C Compiler, Version 3.227, 16465

[PCM programmer]

I just noticed this comment in your ASM file:

[paco]

I tried this after search and search the web but i get an error while programming the pic.

With WinPic800 v.3.58
'Error writting address 0x0003FF
Write 0x3480 Read 0x3FAF'

With IcProg 1.05D
'Code Error in address 0000h !'

Paco

PS: I don't need exactly 4Mhz, this is not a problem.

[paulf1965]

You are setting the TRIS registers incorrectly in the C code. set_tris_a(0x24) sets pin 5 as an input. Should you be using 0x15 instead?

[paulf1965]

Sorry - should have been 0x14 instead (typo)

[paco]

24 in binary is 000000000011000 where (reverse order)

0 - GP0
0 - GP1
0 - GP2
1 . GP3
1 - GP4
0 - GP5
0 - no more pins
0 - no more pins
.....

So GP5 is output... check with the assembler program, it's the same config and the asm it works fine.

but thaks.
Paco.

[PCM programmer]

[paco]

I'm trying a lot of changes in the configuration of both programs... with icprog i finally program a pic but... is a ramdom proccess until i recognize where is the problem because i have modified delay times, Vcc control and.... Bandgap...

¿what is Bandgap in the 12F629?

[paco]

It have not a system to do it, i try and try changing bandgap, selecting (or deselecting "real time") in the icprog, activating and desactivating Vcc control... one of each five times (aprox) the pic is written correctly but doesn't work repeating the parameters... ¿?¿?¿?

But ok, this is an error of my software or programmer but... it is a secondary problem, the main one is that CCS need to write (or to access) to this address (0x03FF)... and one of the solution is your option to add.

#rom 0x3FF = {0x3480}

This is for PIC12F629 and the last value '80' is the standard value to get 4Mhz but must be adjusted for each pic.

Many thanks 'PCM programmer'... next week i'll get a new pic writer to change my older TE20 and i hope not to get this error.

Regards.
Paco.

[paulf1965]

Was late last night and my maths was screwy but point I was trying to make is valid.

In assembler:

movlw b'00011000'
movwf TRISIO ; GP0/1/2/5 output GP3/4 input

OK so you are moving 0001 1000 into the TRIS for the port which corresponds to

7 6 5 4 3 2 1 0
O O O I I O O O

0001 1000 in hex is 0x18 NOT 0x24

0x24 in binary in 0010 0100 which corresponds to

7 6 5 4 3 2 1 0
O O I O O I O O

Thus setting pin 5 as an input. This may not be the only problem and sorry for confusing the issue with my rubbish maths.

Paul.