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Convert decimal to binary format with ST [message #1819329]

Mon, 13 January 2020 05:43

Eclipse User

V1 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 1);
V2 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 2);
V3 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 4);
V4 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 8);
V5 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 16);
V6 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 32);
V7 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 64);
V8 := WORD_TO_BOOL(UINT_TO_WORD(Registers) AND 128);

I use these above in ST,
but when deploying failed.

Re: Convert decimal to binary format with ST [message #1819340 is a reply to message #1819329]

Mon, 13 January 2020 08:59

Eclipse User

wired is , i use if, i am sure the gramma is correct, but can't make it
IF 1>0 THEN
V1 := TRUE;
END_IF
once it remove this, it works, otherwise fails

Re: Convert decimal to binary format with ST [message #1819388 is a reply to message #1819340]

Tue, 14 January 2020 05:57

Eclipse User

Hi,

first of all I'm not sure if there is WORD_TO_BOOL function and how it is supposed to work. What I would do in ST is something like this:

IF (UINT_TO_WORD(QI) AND 1 ) = 1 THEN
BOOL1 := TRUE;
ELSE
BOOL1 := FALSE;
END_IF;
IF (UINT_TO_WORD(QI) AND 2 ) = 2 THEN
BOOL2 := TRUE;
ELSE
BOOL2 := FALSE;
END_IF;
IF (UINT_TO_WORD(QI) AND 4 ) = 4 THEN
BOOL3 := TRUE;	
ELSE
BOOL3 := FALSE;
END_IF;
IF (UINT_TO_WORD(QI) AND 8 ) = 8 THEN
BOOL4 := TRUE;
ELSE
BOOL4 := FALSE;
END_IF;
...

(btw, word is usually 16 bits, are you sure that you only want 8 bits?).. last thing i had to do with this FB after I exported the code from IDE, is to change in the generated cpp all logical ANDs "&&" to bitwise "&".. not sure, if I did something wrong or is it a type exporter. for that, we need to wait for ST/forte experts :-)

Re: Convert decimal to binary format with ST [message #1819465 is a reply to message #1819388]

Wed, 15 January 2020 21:29

Eclipse User

thanks a lot, that is indeed 16bit , i just did a experiment :)

Re: Convert decimal to binary format with ST [message #1821481 is a reply to message #1819465]

Thu, 13 February 2020 09:23

Eclipse User

WORD_TO_BOOL is not a valid cast, as there is no logical way to determine the result. WORD is a bit-pattern, BOOL is a logical value.

Valid and equivalent code would be
V1 := (UINT_TO_WORD(Registers) AND 1) == 1;
V2 := (UINT_TO_WORD(Registers) AND 2) == 2;
and so on.

Another option would be the recently added bit access operators, which should be available in the develop branch.

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