copy input pin to output pin in pasm

Jkane

Hello,

still getting the hang of pasm,

in spin i think you can do this:

outa(6) := ina(5)

but in pasm it does not seem to be the same

so in pasm i have this: (copy input from pin 5 to output on pin 6)
/code

mov dira, dira_modeIO
:loop_15
test test_modeIO, ina wc
rcl tmp, #6
mov outa, tmp ' pin6_Pin15O


jmp #:loop_15


dira_modeIO long %00000000_00000000_11111111_1101111
test_modeIO long %0010_0000

code/

which in my thinking should work,

check pin 5,
set flag, 0 or 1
move to variable with shift
set outa with variable mask.


but it does not work, so i think it is with my mov,


regards

Jeff

CogSaver

This can be done on 2 lines in PASM, assuming the pin directions and pinmasks are already set up.

Unable to test on Propeller right now, but something close to

test inmask,INA  wz
muxz OUTA,outmask

inmask and outmask will be longs with a 1 in the corresponding bit position,
e.g.

inmask  long  %00100000

Edit; if pin gets inverted, use muxnz instead of muxz

Hope this makes sense
CogSaver

Tracy Allen

A direct way to set that one bit is with the muxc command:

test test_modeIO, ina wc
muxc outa, Omask

Omask long %10_0000

A trouble with using rcl tmp,#6 is that it sets all low 6 bits to %11_1111 if carry is one.

kuroneko

Or use a counter which can read from pin A and write it inverted to pin B:

movs ctra, #A
movd ctra, #B
movi ctra, #%0_01001_000

This assumes that B is set as an output and the cog is kept alive otherwise.

Also, in your original code you transfer the carry flag only up to bit 5:

• rcl #1 -> bit 0
• rcl #2 -> bits 1..0
• rcl #6 -> bits 5..0

You'd need at least an rcl tmp, #7 if you want bit 6 to be affected.