Friday, April 23, 2004

I am the guy who did the original post of Dec03 and I wanted to conclude my thread on buying a cheap EPROM burner: I took the advice of the group (Mr. Karas on http://www.8052.com/forum/read.phtml?id=61025) and bought a Cygnal C8051F330-TB. It works well, and it contains a lot of extras that I use:

- a green LED on the circuit board, which ran the first program “BLINK.ASM” – which set the green light blinking. Proof of concept that the device worked.

- The kit was complete, with ports on vertical pins, clearly labeled, and the ancillary equipment (cables, transformer) all there so that all I needed to get BLINK to work was to a PC and a wall outlet.

- The set up was “easy” when I did it jointly with my professor at school. (Thanks, Steve Giordano), and I can make incremental changes to the device.

- It cost about $99 and I bought 5 extra DIP chip versions of the chip for an extra $8 each. These are for my prototype (I will have to learn how to get my program into them.) I purchased them at Mouser (800-346-6873)

- The 8051 chip itself was smaller than the nail on my little finger: ¼ inch by ¼ inch by 1/16 inch. This was cool It is two few ports (two), but I may get around it. The circuit board was 4 by 6 inchesk attached to pwer transformer and some cable, so it was portable with some care.

- I am learning more about wire wrapping and soldering that I wanted to learn. Some fun, though

- I did modify the “blink.asm” progam (still some weird code that I can’t comprehend , e.g. crossbar code .) BUT: I have made new programs

- Thus, I owe all of generous people (with your time and efforts) who posted my thanks. The "8052 message board” worked for me., as did the 8051 Cygnal board.

-- Thanks.
Signed, Peter



Reference; The blink code (courtesy of the fine folks at Cygnal) is :

;-----------------------------------------------------------------------------
; Copyright (C) 2002 CYGNAL INTEGRATED PRODUCTS, INC.
; All rights reserved.
;
; FILE NAME : BLINK.ASM
; DATE : 04 FEB 2003
; TARGET MCU : C8051F33x
; DESCRIPTION : This program illustrates how to disable the watchdog timer,
; configure the Crossbar, configure a port and write to a port
; I/O pin.
;
; NOTES:
;
;-----------------------------------------------------------------------------

$include (c8051f330.inc) ; Include register definition file.

;-----------------------------------------------------------------------------
; EQUATES
;-----------------------------------------------------------------------------

GREEN_LED equ P1.3 ; Green LED: '1' is ON

;-----------------------------------------------------------------------------
; RESET and INTERRUPT VECTORS
;-----------------------------------------------------------------------------

; Reset Vector
cseg AT 0
ljmp Main ; Locate a jump to the start of
; code at the reset vector.

;-----------------------------------------------------------------------------
; CODE SEGMENT
;-----------------------------------------------------------------------------


Blink segment CODE

rseg Blink ; Switch to this code segment.
using 0 ; Specify register bank for the
; following program code.

Main:
; Disable the WDT.
anl PCA0MD, #NOT(040h) ; clear Watchdog Enable bit

; Enable the Port I/O Crossbar
orl P0SKIP, #04h ; skip LED pin in crossbar
; assignments
mov XBR1, #40h ; enable Crossbar
orl P1MDOUT, #08h ; make LED pin output push-pull
orl P1MDIN, #08h ; make LED pin input mode digital

; Initialize LED to OFF
clr GREEN_LED

; Simple delay loop.
Loop2: mov R7, #03h
Loop1: mov R6, #00h
Loop0: mov R5, #00h
djnz R5, $
djnz R6, Loop0
djnz R7, Loop1
cpl GREEN_LED ; Toggle LED.
jmp Loop2

;-----------------------------------------------------------------------------
; End of file.

END