I have built a simple programmer for a PIC16F84. This programmer is
really simple to build. Only problem with it is that it does not work
with some Pentium PC (I have a DELL Latitude CP Pentium 233 MHz laptop computer)
but it does work on my old 286.
I have made a pcb for testing. This is actually designed for a ModelRailroad DCC interface
but is also useful for simple testprograms. This design can be found at :
http://geocities.datacellar.net/CapeCanaveral/7706/tmw01.html
My first PIC application IOPIC000
I Have built a simple test program to blink the LED.
The necessary steps to test this is :
1. Download design for programmer
2. Build programmer and install a PIC16C84 or PIC16F84
3. Download testprogram and unzip (updated june 4 - now contains sourcecode)
4. Connect programmer to serial port and run programmer
5. Build TMW01 Hardware and install the programmed PIC Controller
6. Connect 5V DC (and Ground) to TMW01 (DO NOT CONNECT TO COMPUTER or anything else) and see led blinking.
7. Start experimenting by modifying iopic000.asm
8. download assembler
MPASM
from microchip
9. Insert PIC in programmer and continue with step 4
IOPIC000.ASM - Source Code
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;*******************************************************************
; iopic001.asm
;
; This code blinks LED connected to pin 2
; This program was written by fpederse 19990604
; It was originally based on walk.asm that can be found at:
; http://hobbes.king.ac.uk/matt/pic/
;*******************************************************************
LIST P=16C84;f=inhx8m
_CP_OFF equ H'3FFF' ;code protect off
_PWRTE_ON equ H'3FFF' ;Power on timer on
_WDT_OFF equ H'3FFB' ;watch dog timer off
_XT_OSC equ H'3FFD' ;crystal oscillator
__CONFIG _CP_OFF & _PWRTE_ON & _WDT_OFF & _XT_OSC
;configure programmer directive
w equ 0 ; register destination numbers.
f equ 1
same equ 1
z equ 2 ; status flags
zero equ 2
c equ 0
carry equ 0
count1 equ 0C ; wait counter ls digit file register C
count2 equ 0D ; wait counter ms digit file register D
portb equ 06 ; port b I/O register f6
porta equ 05 ; port a I/O register f5
status equ 03 ; status register f3
;
;
;
org 0 ; origin
;
init
movlw 0
tris porta ; set porta as outputs
movwf porta ; set porta levels all low
;-----------------------------------------------------------------------
; Start usermodificable code :
;-----------------------------------------------------------------------
start
bsf porta,3 ; set porta bit 3 high / pin 2 / LED
call wait_sec_10 ; Wait approx. 10 Sec
bcf porta,3 ; Set porta bit 3 low / pin 2 / LED
call wait_sec_10 ; Wait approx. 10 Sec
goto start
;
; ----------------------------
; wait subroutines
; ----------------------------
wait_min
call wait_sec_30
call wait_sec_30
return
wait_sec_30
call wait_sec_10
call wait_sec_10
call wait_sec_10
return
wait_sec_10
call wait_sec_5
call wait_sec_5
return
wait_sec_5
call wait_sec
call wait_sec
call wait_sec
call wait_sec
call wait_sec
return
wait_sec
call wait1
call wait1
return
wait1
call wait0
call wait0
call wait0
call wait0
return
wait0
movlw .200 ; load count1 with decimal 200
movwf count1
d1 movlw .200 ; load count2 with decimal 200
movwf count2
d2 decfsz count2,same ; decrement and skip next line if zero
goto d2 ; if not zero
decfsz count1 ; decrement count1 if count2 is zero
goto d1 ; do inside loop again if count2 nz
return
; ----------------------------
END
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IO Pic Serial Detector basic functionality will be to read the input startus of port B
and send this to a RS232 Port connected to port A. This project is based on
Microship Application note 555
Microship Application note 555
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