Learing Memory

Archiver

please help me I am just learing how to work with storing things in
the eeprom. for me to learn i made a program that has three buttons,
a motor and a few leds i added the read and write so it will remember
what the last speed was. here is the program

a var byte
b var byte
c var byte
speed var byte
speeda var byte

main:

read 0,speed

start:
low 0
low 1
button 12,1,25,3,a,1,down
button 13,1,25,3,b,1,up
button 14,1,255,255,c,1,halt
if speed < 100 then up
if speed > 254 then down
pwm 11,speed,40
pause 0
debug cls
debug ? Speed
if speeda < speed then eeprom
if speeda > speed then eeprom
speeda = speed
goto start

up:
speed = speed+1
goto start

down:
speed = speed-1
goto start

halt:
speed = 0
pause 50
low 11
high 0
debug "STOPED"


restart:
button 13,1,255,255,d,1,main
goto restart

eeprom:
write 0,speed
high 1
pause 1
goto start


the program works, but output 1 will flash telling me that the
program is allways writing to the eeprom. i don't want it to write to
the eeprom unless the speed has changed

please help me
tony

Archiver

[font=arial,helvetica]In a message dated 3/17/01 11:13:12 AM Central Standard Time,
aconti@neo.rr.com writes:

please help me I am just learing how to work with storing things in
the eeprom. for me to learn i made a program that has three buttons,
a motor and a few leds i added the read and write so it will remember
what the last speed was. here is the program

a var byte
b var byte
c var byte
speed var byte
speeda var byte

main:

·read 0,speed

start:
·low 0
·low 1
·button 12,1,25,3,a,1,down
·button 13,1,25,3,b,1,up
·button 14,1,255,255,c,1,halt
·if speed < 100 then up
·if speed > 254 then down
·pwm 11,speed,40
·pause 0
·debug cls
·debug ? Speed
·if speeda < speed then eeprom
·if speeda > speed then eeprom
·speeda = speed
·goto start

up:
·speed = speed+1
·goto start

down:
·speed = speed-1
·goto start

halt:
·speed = 0
·pause 50
·low 11
·high 0
·debug "STOPED"


restart:
·button 13,1,255,255,d,1,main
goto restart

eeprom:
·write 0,speed
·high 1
·pause 1
·goto start


the program works, but output 1 will flash telling me that the
program is allways writing to the eeprom. i don't want it to write to
the eeprom unless the speed has changed

The problem is simple to fix. ·You need to move the line:

·speeda = speed

to your subroutine EEPRom since that's where you jump if there is a speed
difference. ·You can also simplify your main code by doing one comparison:

·IF speed <> speeda THEN EEPRom

-- Jon Williams
-- Dallas, TX[/font]