TEST and INA ?

jazzed

Maybe I haven't had enough coffee, but .... does INA work with the TEST instruction?

'This works

                mov     rxbit,          ina
                test    rxbit,          #2 wz ' test value & convert to bool
                if_z    mov     rxbit,  #0
                if_nz   mov     rxbit,  #1

'This doesn't ????

                test    ina,            #2 wz ' test value & convert to bool
                if_z    mov     rxbit,  #0
                if_nz   mov     rxbit,  #1

TIA


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jazzed·... about·living in·http://en.wikipedia.org/wiki/Silicon_Valley

Traffic is slow at times, but Parallax orders·always get here fast 8)

nutson

Look in the "tips and traps" sticky page 6. INA cannot be used as·the destination register

Beau Schwabe

jazzed,

nutson·is correct.· Look at Chapter 1 for the Propeller (1:Introducing the Propeller Chip) on the first page (page 23 of the propeller manual hard copy)

There, you will find a table of registers that states that the INA, because it is a read-only register is·"...Only accessible as a Source Register (i.e. MOV DEST,SOURCE)."

Since you can't have a constant in the DEST field either, you can pre-define a variable value to use in the DEST, so your code might look something like this.

                test    temp_var,      ina wz ' test value & convert to bool
                if_z    mov     rxbit,  #0
                if_nz   mov     rxbit,  #1

rxbit         long      0
temp_var      long      2

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

jazzed

Great [noparse]:)[/noparse] Thanks for suggesting the cycle saving alternative Beau.

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jazzed·... about·living in·http://en.wikipedia.org/wiki/Silicon_Valley

Traffic is slow at times, but Parallax orders·always get here fast 8)

Beau Schwabe

jazzed,

To save cycles, you should also look at the MUXNZ operator...

                test    temp_var,      ina wz ' test value & convert to bool
                muxnz   rxbit,  #1


rxbit         long      0
temp_var      long      2

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

jazzed

Cool 8-) I almost made that connection. Thanks for the push [noparse]:)[/noparse]

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jazzed·... about·living in·http://en.wikipedia.org/wiki/Silicon_Valley

Traffic is slow at times, but Parallax orders·always get here fast 8)