I need to read and store signed floating point ASCII (-xx.x)

Lynxmotion Electronics & Software
1

Hello,

I need to store floating point ascii data * 10 in a sword variable, but REAL modifier work only for OUTPUT.

String format of sensor is XXX.X can be :

String = “18.7” I need store Var = 187
String = “0.4” I need store Var = 4
String = “-0.5” I need store Var = -5
String = “-36.0” I need store Var = -360

My code work only for POSITIVE value:(

'input is 10.5 serin pin, baud, [dec int, dec flo] output = int * 10 + flo 'output is 105, work.

I can’t test “int” because I lost sign for -0.xxxx

Edit: I use Atom Pro 28 + IDE 8.0.1.3

Please help me.
Pascal

2

Atom or Atom Pro…

3

Sorry
Pro 28, I use 8.0.1.3 beta.

Pascal

4

I know this is an older post but I wanted to give an answer for those who may need it in the future.

Use “sdec” instead of “dec” to read in signed values via serin.

5

sdec cannot read signed negative value…
How to ?

6

DEC is for UNSIGNED values
SDEC if for signed values.

Ie. DEC will ignorethe “-” character.

If you send a “-123” DEC will only see “123”.

SDEC sees “-” characters so if you send “-123” it will see “-123” and return a -123. Note you MUST use signed variables with sdec for it to work correctly.

For example, if you send a “-1” to SDEC but the variable for SDEC is a WORD(instead of an SWORD) your variable will hold 65535 instead of -1.