gnupic: first attempt flops
Subject:
first attempt flops
From:
"Maxim Wexler" ####@####.####
Date:
15 Jun 2006 03:50:27 +0100
Message-Id: <a0811460606141950y29565ca1m71e1636ca3ad24e4@mail.gmail.com>
Hi group,
I finally got everything setup with an Olimex PG2C serial programmer on my
ubuntu box and tried my first stab at programming a pic.
I found a very simple program called Toggle
booyah@ubuntu:~/docs/pic/toggle$ cat Toggle.asm
; *******************************************
; This program for the PIC16F874 solves the following program
; specification:
; 1. Have the processor toggle Port A <4> repeatedly.
; *******************************************
;
; Filename: Toggle.asm
; Date: 31 January 2005
; File Version: 1
;
; Author: CDR Charles B. Cameron, USN
; Company: United States Naval Academy
;
;
; *******************************************
;
; Files required
;
; p16f874.inc
;
; *******************************************
; Notes:
; This program initializes PORT A <4> to 0. It then enters
; a perpetual loop, toggling the value of A<4> each time.
; *******************************************
list p=16f874 ; list directive to define processor
#include <p16f874.inc> ; processor specific variable
definitions
__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC &
_WRT_ENABLE_ON & _LVP_OFF & _CPD_OFF
; '__CONFIG' directive is used to embed configuration data within the .asm
file.; The labels following the directive are defined in the 16f874.incfile.
; See the data sheet for additional information on the configuration word.
; The particular choice given above turns code protection off, watch dog
timer off,
; brown-out reset disabled, power-up timer enabled, HS oscillator mode
selected,; flash program memory write disabled, low-voltage in-circuit
serial programming; disabled, and data EE memory code protrection off.
Other choices
; might be useful in certain circumstances. For example, if the watchdog
timer
; were in use, replacting _WDT_OFF with _WDT_ON would be appropriate.
;***** VARIABLE DEFINITIONS
; Bits within PORTA
ToggleBit equ B'00010000' ; Designates bit 4 of Port
A.
; This is an
open-drain output bit, so
; a pull-up
resistor is needed.
TRISAMask equ B'11101111' ; Make bit 4 of PORT A an
output.
; Leave the
rest as input bits.
ADCON1InitMask equ B'00000110' ; Make all PORT A bits digital, not analog
; *******************************************
ORG 0x000 ; Start with the processor's
reset vector
clrf PCLATH ; Ensure page 0 is used
goto main ; Go to beginning of program
main
; *******************************************
; Initialize registers as required
; *******************************************
bcf STATUS,RP0 ; Select Bank 0
bcf STATUS,RP1
clrf PORTA ; Initialize Port A by
clearing the output latches.
; *******************************************
; Switch to Bank 1 and continue doing initializations.
; *******************************************
bsf STATUS,RP0 ; Select Bank 1
movlw TRISAMask ; Initialize direction pins
for Port A using TRISA.
movwf TRISA
movlw ADCON1InitMask ; Initialize the ADCON1 register to
control which
; Port A
pins use analog inputs.
movwf ADCON1
bcf STATUS,RP0 ; Revert to Bank 0
;main()
; This is the main program. It does only one thing: toggle
PORTA<togglebit>
loop
movlw ToggleBit
xorwf PORTA,f
goto loop ; Repeat ad infinitum
; *******************************************
END ; directive to assembler: this is the end
of the program
And it compiles without error:
booyah@ubuntu:~/docs/pic/toggle$ cat Toggle.hex
:08000000018A2802128313030185168330EF0085D5
:060008003006009F128330100685280B8A
:012007003F3267
:00000001FF
Then I got this:
booyah@ubuntu:~/docs/pic/toggle$ picprog --burn --input Toggle.hex -p
/dev/ttyS0 -d pic16f874
Picprog version 1.8.1, Copyright (c) 2006 Jaakko Hyvätti <
####@####.####
Picprog comes with ABSOLUTELY NO WARRANTY; for details
type `picprog --warranty'. This is free software,
and you are welcome to redistribute it under certain conditions;
type `picprog --copying' for details.
Device pic16f874, program memory: 4096, data memory: 128.
CPU clock speed: 930 MHz
Burning program memory,/dev/ttyS0:PIC programmer missing or chip fault
/dev/ttyS0:0000:unable to read pic while programming
The chip is brand new from Digi-key, never been programmed before. I know
the port is OK cuz I've used it with an external modem, minicom works and I
can scope the TxD line when I send keyboard input through the port.
Anybody see what's wrong here?
-Maxim
