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Autodocs
 Devices:
 audio.device
  ADCMD_ALLOCATE
  ADCMD_FINISH
  ADCMD_FREE
  ADCMD_LOCK
  ADCMD_PERVOL
  ADCMD_SETPREC
  ADCMD_WAITCYCLE
  AbortIO
  BeginIO
  CMD_CLEAR
  CMD_FLUSH
  CMD_READ
  CMD_RESET
  CMD_START
  CMD_STOP
  CMD_UPDATE
  CMD_WRITE
  CloseDevice
  Expunge
  OpenDevice
Include
GuruMeditation
Docs » Autodocs » audio.device » CMD_RESET

NAME

       CMD_RESET -- restore device to a known state

FUNCTION

       CMD_RESET is a standard command for multiple audio channels.  For each
selected channel (io_Unit), if the allocation key (ioa_AllocKey) is
correct, CMD_RESET:
. clears the hardware audio registers and attach bits,
. sets the audio interrupt vector,
. cancels all pending I/O (CMD_FLUSH), and
. un-stops the channel if it is stopped (CMD_STOP),
Otherwise, CMD_RESET returns an error (ADIOERR_NOALLOCATION).
CMD_RESET is synchronous and only replies (mn_ReplyPort) if the quick
flag (IOF_QUICK) is clear. Do not use CMD_RESET in interrupt code at
interrupt level 5 or higher.

INPUTS

       mn_ReplyPort- pointer to message port that receives I/O request
if the quick flag (IOF_QUICK) is clear
io_Device - pointer to device node, must be set by (or copied from
I/O block set by) OpenDevice function
io_Unit - bit map of channels to reset (bits 0 thru 3 correspond
to channels 0 thru 3)
io_Command - command number for CMD_RESET
io_Flags - flags, must be cleared if not used:
IOF_QUICK - (CLEAR) reply I/O request
ioa_AllocKey- allocation key, must be set by (or copied from I/O block
set by) OpenDevice function or ADCMD_ALLOCATE command

RESULT

       io_Unit     - bit map of channels to successfully reset (bits 0 thru 3
correspond to channels 0 thru 3)
io_Error - error number:
0 - no error
ADIOERR_NOALLOCATION - allocation key (ioa_AllocKey)
does not match key for channel

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