rctime problems

FrankA_645

Hello,

Im currently going through the whats a microcontroller book, and Im having some problems with the DialDisplay program in chapter 6. After setting the circuit just like the picture, and copying the code, the 7 segment display would not change as I turned the pot (all 5 segments stayed lit). I added a debug command after the rctime (debug ? time , crsrup) and I am getting totally random values usually around 10-14, but sometimes up to 60. These values change when i spin the pot, but in no particular order.
The strange part is when it says 60 it will still not turn off a segment (the first value in the lookdown table is 40). hrmm. any ideas?
thanks -Frank

Mike Green

There must be something about what you've done that's different from what's in the book.

1) Go through what you've wired up and make absolutely sure that what you've wired is the same as in the book

2) Go through the program and make absolutely sure that it's exactly the same as what's in the book.

3) Post a picture of what you've got (physically) and post a copy of your program (as attachments to a reply).

4) Check the various connections. Sometimes a wire isn't connected properly.

FrankA_645

here is the code, (also attached)· I will take a picture right now..

' {$STAMP BS2}
' {$PBASIC 2.5}

DEBUG "lere we go; pot & lcd"·· , CR
time VAR Nib
index VAR Word
OUTH = %00000000
DIRH = %11111111
DO
· HIGH 5
· PAUSE 100
· RCTIME 5, 1, time

· DEBUG ? time , CRSRUP

· LOOKDOWN time, <= [noparse][[/noparse]40, 150, 275, 400, 550, 800], index
· LOOKUP index, [noparse][[/noparse] %11100101, %11100001, %01100001,
· %00100001, %00000001, %00000000 ], OUTH
LOOP

FrankA_645

...and the picture. I'm pretty sure everything is seated nicely. I keep thinking the pot is bad.. but it still wont turn off a segment when the rctime is over 40. thanks! -frank

Mikerocontroller

·It looks like you accidently declared "index" as a word variable and "time" as a nib variable.· It should be the other way around.· A nib can only store from 0-15 in decimal.

Franklin

your posted code looks nothing like the code in the book as far as I went. Exactly what page are you referencing? (I didn't look at the code you attached, sorry)

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- Stephen

FrankA_645

A-HA! I had the index and time variables set to the wrong types! works great now. man I spent the last couple hours on this.. and read and read it so many times I cant believe i missed it! haha.

FrankA_645

thanks guys!! Im sure i will have lots more questions.. Thanks again!