Topic       : The ATARI Compendium
Author      : Scott Sanders / JAY Software
Version     : 1.25 (20/6/2003)
Subject     : Documentation
Nodes       : 1117
Index Size  : 32614
HCP-Version : 6
Compiled on : Atari
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@lang       : en
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View Ref-FileGpio()                                                                XBIOS

Syntax

LONG Gpio( mode, data )
WORD mode, data;

Function      Gpio() reads/writes data over the general purpose pins on the
              DSP connector.

Opcode        138 (0x8A)

Availability  Available only when bit #3 of the '_SND' cookie is set.

Parameters    mode specifies the meaning of data and the return value as
              follows:

              Name        mode  Meaning

              GPIO_INQUIRE  0   Return the old value.

              GPIO_READ     1   Read the three general purpose pins and
                                return their state in the lower three bits
                                of the returned value. data is ignored.

              GPIO_WRITE    2   Write the lower three bits of data to the
                                corresponding DSP pins. The return value
                                is 0.

Binding       move.w   data,-(sp)
              move.w   mode,-(sp)
              move.w   #$8A,-(sp)
              trap     #14
              addq.l   #6,sp