setting pullups 10F200, command not recognized.

[tony golding]

i am currently playing with a few different chips with gcb and seem to have an issue with setting the internal weak pullups on a 10F200, a bland boring and featureless chip i know but still supprisingly usefull for me.

as part of a learning curve with a new language i like to learn by just going through setting and testing the chips features just to get acquainted with the language as that seems to help.

i am just wanting to enable the weak internal pullups so i can get on with adding some code.

the only reference i found was this thread:
https://sourceforge.net/p/gcbasic/discussion/579126/thread/d9b9d558/?limit=25#b082

i have inserted that into the program up top with the rest of the setup data but it will not pass a compile, if i remove it then all is good.

; FILE: pic10Fxxx functions test/weak pullup.gcb

;
; ----- Configuration
#chip 10F200, 4
#config MCLRE = OFF,CP = OFF,WDT = OFF

; ----- define ports
#define led_1 GPIO.0
#define led_2 GPIO.1
#define bttn GPIO.3

; ----- set port directions
dir led_1 out
dir led_2 out
dir bttn in

set NOT_GPPU, off

; ----- Main body of program commences here.

do


loop

theres nothing to it at the moment as i was checking it would compile for errors so no point adding main code until i can use the pullups.

so it seems that i have presumably missed something then?
thats the command as in the 10F200.dat file i checked it so am i just using a wrong command before it?

using current version of gcb@syn

tony

[kent_twt4]

Looks like a typo. NOT_GPPU has a comma attached :).

[tony golding]

even without the comma and just set NOT_GPPU off it still gives an error:

Error: GCASM:bad ORG overwriting location 0

tony

[kent_twt4]

My apologies, it has been quiet some time since I've played with the 10f's. An unattended consequence of clearing the NOT_GPPU bit, is gcasm makes the OPTION register a variable (Not Good). To my recollection OPTION in assembler is special kind of operator, it automatically loads the W register. So the answer is to use some assembler, get used to it if you intend to get much beyond a blinky led :). This now compiles:

#chip 10F200, 4
#config MCLRE = OFF ,WDT = OFF CP = OFF

; ----- define ports
#define led_1 GPIO.0
#define led_2 GPIO.1
#define bttn GPIO.3

; ----- set port directions
dir led_1 out
dir led_2 out
dir bttn in

;set NOT_GPPU off
movlw   b'10001111'
option
; ----- Main body of program commences here.

do

loop

[tony golding]

thank you for the solution kent, i tried a 10f322 last night after the initial test with this chip and that one appears ok for the pullup commands so just this 10f200 is a bit more picky lol.

tony

[kent_twt4]

The baseline chips are a real challenge. GCBasic does a good job of structuring the work flow, like loops and conditionals. It's when you start using delays and math that the variables start piling up, and code space gets crimped. Then you start having to be creative.

The 10f322 is a fantastic little chip.

[Chuck Hellebuyck]

Yes, Agree with Kent
If you want to work with the PIC10F, then the PIC10F320 and 322 should be your choice. They are both midrange core parts (14 bit core vs 12 bit core for baseline) with all the latest features including interrupts.
Baseline parts are very limited.

[tony golding]

thanks guys, i will more than likely end up using the 10f322, its so feature packed and being available in sot 23-6 is very handy for my unhealthy smd addiction lol.

thanks for the help with this one.

tony