CMD_RESET

restore device to a known state

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.

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

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