lib/int_to_bcd.txt
author etisserant
Wed, 31 Jan 2007 16:00:18 +0100
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parent 0 fb772792efd1
permissions -rwxr-xr-x
Changes made since Mario visit at LOLITECH. Thanks again !
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(*
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 * (c) 2003 Mario de Sousa
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 *
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 * Offered to the public under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the
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 * License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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 * Public License for more details.
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 *)
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(*
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 * An IEC 61131-3 IL and ST compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 *)
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(*
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 * This is part of the library conatining the functions
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 * and function blocks defined in the standard.
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 *
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 * Conversion to BCD
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 * -----------------
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 *)
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FUNCTION USINT_TO_BCD_BYTE: BYTE
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  VAR_INPUT
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    VALUE : USINT;
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  END_VAR
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  USINT_TO_BCD_BYTE := VALUE MOD 10;
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  VALUE := VALUE / 10;
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  USINT_TO_BCD_BYTE := USINT_TO_BCD_BYTE + 16*VALUE;
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  IF VALUE > 9
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  THEN
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    (* The standard is silent on how to handle overflows!! *)
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    (* We simply set it to the highets value!              *)
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    USINT_TO_BCD_BYTE := 16#99;
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  END_IF;
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END_FUNCTION
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FUNCTION UINT_TO_BCD_WORD: WORD
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  VAR_INPUT
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    VALUE : UINT;
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  END_VAR
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  UINT_TO_BCD_WORD := VALUE MOD 10;
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  VALUE := VALUE / 10;
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  UINT_TO_BCD_WORD := UINT_TO_BCD_WORD + 16*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UINT_TO_BCD_WORD := UINT_TO_BCD_WORD + 16*16*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UINT_TO_BCD_WORD := UINT_TO_BCD_WORD + 16*16*16*VALUE;
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  IF VALUE > 9
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  THEN
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    (* The standard is silent on how to handle overflows!! *)
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    (* We simply set it to the highets value!              *)
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    UINT_TO_BCD_WORD := 16#9999;
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  END_IF;
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END_FUNCTION
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FUNCTION UDINT_TO_BCD_DWORD: DWORD
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  VAR_INPUT
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    VALUE : UINT;
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  END_VAR
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  UDINT_TO_BCD_DWORD := VALUE MOD 16;
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 16*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 256*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 16*256*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 256*256*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 16*256*256*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 256*256*256*(VALUE MOD 10);
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  VALUE := VALUE / 10;
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  UDINT_TO_BCD_DWORD := UDINT_TO_BCD_DWORD + 16*256*256*256*VALUE;
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  IF VALUE > 9
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  THEN
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    (* The standard is silent on how to handle overflows!! *)
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    (* We simply set it to the highest value!              *)
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    UDINT_TO_BCD_DWORD := 16#9999_9999;
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  END_IF;
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END_FUNCTION
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FUNCTION ULINT_TO_BCD_LWORD: LWORD
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  VAR_INPUT
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    VALUE : UINT;
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  END_VAR
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  ULINT_TO_BCD_LWORD := UDINT_TO_BCD_DWORD(VALUE MOD 1_0000_0000);
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  VALUE := VALUE / 1_0000_0000;
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  ULINT_TO_BCD_LWORD := ULINT_TO_BCD_LWORD + 256*256*256*256*UDINT_TO_BCD_DWORD(VALUE);
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END_FUNCTION