[Oberon] How to use SYSTEM.VAL safely?

Joerg joerg.straube at iaeth.ch
Wed Mar 31 19:10:39 CEST 2021

Okay, you want to display decimal nbrs upto 00..99 and the interface to your segment display is BCD.

   val DIV 10*16 + val MOD 10);
does the job


> Am 31.03.2021 um 18:51 schrieb Jeff Maggio <jmaggio14 at gmail.com>:
> Thanks!
> I'm actually using binary-coded decimal, which is a little different. I'm writing two separate 4bit decimal digits alongside each other. Each 4bit field drives a separate seven segment display on our embedded board
> best,
> Jeff
>> Jeff For bitwise operations SYSTEM.VAL is safe.
>> The hint to the garbage collection is rather meant in case you manipulate POINTERs by doing calculations on them using INTEGERs.
>> Common low-level programming practice BTW: If I understand correctly what you want to do with SetVal is, interprete the decimal input value as hex nbr. SetVal(73) will store value 115 at address SEVENSEGADR. If so, I would code it as follows:
>> val DIV 10*16 + val MOD 10); Perhaps an other method would be to call SetVal with the hex value in the first place:
>> SetValue(73H);
>> and SerVal just does
>> Jörg
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