enums - Ada enumerations with duplicate values -

i'm trying have device register enumeration. reading register has 2 values -> 0 means done, 1 means pending. likewise, writing register has 2 values -> 0 has no action , 1 reset. so, wrote following code

   type soft_reset (done, pending, no_action, reset);    soft_reset use      (done      => 0,       pending   => 1,       no_action => 0,       reset     => 1); 

but throws error

gcc-4.6 -c -g -gnatg -ggdb -i- -gnata /home/sid/tmp/device.adb device.ads:93:20: enumeration value "no_action" not ordered gnatmake: "/home/sid/tmp/device.adb" compilation error 

is possible enumeration have duplicate values?

i don't think so. think more elegant create 2 enumerated types indicating 1 corresponds possible readable values of register , other 1 corresponds writable values.

something like:

type register_status (done, pending)    -- values can read type soft_reset      (no_action, reset) -- values can written 

gneuromante's post @ bottom direct answer question.