Subversion Repositories ssbcc

# Copyright 2014, Sinclair R.F., Inc.

def inport(ad):

  """

  Built-in macro to read the specified input port and save the value on the

  top of the data stack.\n

  Usage:

    .inport(I_name)

  where

    I_name      is the name of the input port.\n

  The effect is:  T = <value from the specified input port>\n

  ( - u )

  """

  # Add the macro to the list of recognized macros.

  ad.AddMacro('.inport', 2, [ ['','symbol'] ]);

  # Define the macro functionality.

  def emitFunction(ad,fp,argument):

    if not ad.IsInport(argument[0]['value']):

      raise asmDef.AsmException('Symbol "%s is not an input port at %s' % (argument[0]['value'],argument[0]['loc']));

    name = argument[0]['value'];

    ad.EmitPush(fp,ad.InportAddress(name) & 0xFF,name);

    ad.EmitOpcode(fp,ad.InstructionOpcode('inport'),'inport');

  ad.EmitFunction['.inport'] = emitFunction;