Docs » Autodocs » potgo.resource » AllocPotBits
AllocPotBits -- Allocate bits in the potgo register.
allocated = AllocPotBits(bits)
UWORD AllocPotBits( UWORD );
The AllocPotBits routine allocates bits in the hardware potgo
register that the application wishes to manipulate via
WritePotgo. The request may be for more than one bit. A
user trying to allocate bits may find that they are
unavailable because they are already allocated, or because
the start bit itself (bit 0) has been allocated, or if
requesting the start bit, because input bits have been
allocated. A user can block itself from allocation: i.e.
it should FreePotgoBits the bits it has and re-AllocPotBits if
it is trying to change an allocation involving the start bit.
bits - a description of the hardware bits that the application
wishes to manipulate, loosely based on the register
START (bit 0) - set if you wish to use start (i.e. start
the proportional controller counters) with the
input ports you allocate (below). You must
allocate all the DATxx ports you want to apply
START to in this same call, with the OUTxx bit
DATLX (bit 8) - set if you wish to use the port associated
with the left (0) controller, pin 5.
OUTLX (bit 9) - set if you promise to use the LX port in
output mode only. The port is not set to output
for you at this time -- this bit set indicates
that you don't mind if STARTs are initiated at any
time by others, since ports that are enabled for
output are unaffected by START.
DATLY (bit 10) - as DATLX but for the left (0) controller,
OUTLY (bit 11) - as OUTLX but for LY.
DATRX (bit 12) - the right (1) controller, pin 5.
OUTRX (bit 13) - OUT for RX.
DATRY (bit 14) - the right (1) controller, pin 9.
OUTRY (bit 15) - OUT for RY.
allocated - the START and DATxx bits of those requested that
were granted. The OUTxx bits are don't cares.