PIC10F202 Variable trouble

[George]

I'm converting an old PIC12C671 program to run on a a 10F202 but for some reason it's not working.

I'm using microcode 2.3 and pbp2.46 it has the 10f202 library in it.

The errors I get are: ERROR unable to fit variable dim
it also says this about every other variable I'm using

Any thoughts would be greatly appreciated

Program starts like:

@ device pic10F202, mclr_off, protect_off, wdt_off

TRISIO = %1100

triac VAR GPIO.2
trigger VAR GPIO.3

dim VAR WORD
Time VAR WORD
Time2 VAR BYTE
startup VAR BYTE
b0 VAR BYTE

Clear
GPIO = 0
dim = 100


Start:

[paul borgmeier]

The 10F202 has only 24 bytes of SRAM (Data Memory). The System variables associated with PBP require 20 bytes - that leaves you with 4. (From the PBP manual "Several system variables, using about 24 bytes of RAM" - its only 20 for the 10F202)

You can have 2 additional WORDS or 4 additional BYTES- that is it (you have 7 bytes defined). Can you reuse variables?

EDIT - The PBP manual is great - read section 7.6. If you do not have nested Gosubs or they are not nested 4 deep you might be able to steal a byte or two from the stack array.

[George]

Like the last edit on yr reply - tho not sure how to do it, the program is only 183 words long and I have no gosubs at all and only one goto at the very end.

Are you able to elaborate on how to steal a couple of bytes from the stack?

I was thinking that the 10F202 was going to be a neat little chip to use, but am having 2nd thoughts about it now knowing the ram limitations. Would be good to see if PBP could use only simple instructions for the 10F20X series chips and use say only 12bytes.

Thanks

[sayzer]

Hi George,

If it is not a secret government project, can you post your code?


-------------------------

[George]

Sure, all it does is dims a light down after 20 minutes of being on.

@ device pic10F202, mclr_off, protect_off, wdt_off

TRISIO = %1100

triac VAR GPIO.2
trigger VAR GPIO.3

dim VAR WORD
Time VAR WORD
Time2 VAR BYTE
b0 VAR BYTE

Clear
GPIO = 0
dim = 100


Start:

time = time + 1 'increment timer in 1/50 seconds

IF time > 30000 Then 'make a 10 min increment
time = 0
time2 = time2 + 1
EndIF

b0 = b0 + 1 'increment for every 4 phase cycles
IF b0 >= 3 Then b0 = 0

IF time2 >= 2 AND b0 = 2 Then dim = dim + 1 'if over 20 min then start dimming dim period 4 cycles = 10 mins

IF dim > 7500 Then dim = 7500 'down to dim level - 9000 = off, 7500 approx 15%

if time2 > 72 then 'turn off after 12 hours
dim = 9000
time2 = 73 'prevent from cycling
endif

LowSide: 'look for trigger points and trigger triac

IF trigger = 1 Then lowside 'wait for phase to go low
GPIO.5 = 0 'weight input to sense zero crossing
PauseUs dim 'wait for dim period
Output triac 'fire triac
triac = 0
PauseUs 400
Input triac

HighSide:

IF trigger = 0 Then HighSide
GPIO.5 = 1
PauseUs dim
Output triac
triac = 0
PauseUs 400
Input triac

GoTo start

[mister_e]

It's the down side of those nifty 10Fs with most compiler. The use of assembler is handy in this case... but i'll have a look at this one to see what i can do...