(* libsimpleio bindings for GNU Modula-2 *)

(* Copyright (C)2018-2023, Philip Munts dba Munts Technologies.                *)
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(* Redistribution and use in source and binary forms, with or without          *)
(* modification, are permitted provided that the following conditions are met: *)
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DEFINITION MODULE FOR "C" libspi;

  IMPORT
    SYSTEM;

  EXPORT UNQUALIFIED
    AUTO_CS,
    SPI_open,
    SPI_close,
    SPI_transaction;

  CONST
    AUTO_CS = -1;

  PROCEDURE SPI_open
   (name      : ARRAY OF CHAR;
    mode      : CARDINAL;
    wordsize  : CARDINAL;
    speed     : CARDINAL;
    VAR spifd : INTEGER;
    VAR error : CARDINAL);

  PROCEDURE SPI_close
   (spifd     : INTEGER;
    VAR error : CARDINAL);

  PROCEDURE SPI_transaction
   (spifd     : INTEGER;
    csfd      : INTEGER;
    cmd       : SYSTEM.ADDRESS;
    cmdlen    : CARDINAL;
    delayus   : CARDINAL;
    resp      : SYSTEM.ADDRESS;
    resplen   : CARDINAL;
    VAR error : CARDINAL);

END libspi.