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- TABLE OF CONTENTS
-
- potgo.resource/AllocPotBits
- potgo.resource/FreePotBits
- potgo.resource/WritePotgo
- potgo.resource/AllocPotBits potgo.resource/AllocPotBits
-
- NAME
- AllocPotBits -- Allocate bits in the potgo register.
-
- SYNOPSIS
- allocated = AllocPotBits(bits)
- D0 D0
-
- UWORD AllocPotBits( UWORD );
-
- FUNCTION
- 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.
-
- INPUTS
- bits - a description of the hardware bits that the application
- wishes to manipulate, loosely based on the register
- description itself:
- 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
- clear.
- 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,
- pin 9.
- 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.
-
- RESULTS
- allocated - the START and DATxx bits of those requested that
- were granted. The OUTxx bits are don't cares.
-
- potgo.resource/FreePotBits potgo.resource/FreePotBits
-
- NAME
- FreePotBits -- Free allocated bits in the potgo register.
-
- SYNOPSIS
- FreePotBits(allocated)
- D0
-
- void FreePotBits( UWORD );
-
- FUNCTION
- The FreePotBits routine frees previously allocated bits in the
- hardware potgo register that the application had allocated via
- AllocPotBits and no longer wishes to use. It accepts the
- return value from AllocPotBits as its argument.
-
- potgo.resource/WritePotgo potgo.resource/WritePotgo
-
- NAME
- WritePotgo -- Write to the hardware potgo register.
-
- SYNOPSIS
- WritePotgo(word, mask)
- D0 D1
-
- void WritePotgo( UWORD, UWORD );
-
- FUNCTION
- The WritePotgo routine sets and clears bits in the hardware
- potgo register. Only those bits specified by the mask are
- affected -- it is improper to set bits in the mask that you
- have not successfully allocated. The bits in the high byte
- are saved to be maintained when other users write to the
- potgo register. The START bit is not saved, it is written
- only explicitly as the result of a call to this routine with
- the START bit set: other users will not restart it.
-
- INPUTS
- word - the data to write to the hardware potgo register and
- save for further use, except the START bit, which is
- not saved.
- mask - those bits in word that are to be written. Other
- bits may have been provided by previous calls to
- this routine, and default to zero.
-
-