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Bc2000 (for the BCF2000 & BCR2000)

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Problem with crafting values to be sent

Problem with crafting values to be sent

2012-08-19 by Bruno

Hi guys,

While working on implementation file for SY77 I encountered a problem
I cannot solve: sending a specific range with sign bit. Long story
short:
 - values 0 ... 7 correspond to range 0 ... 7
 - value 8 is ignored
 - values 9 ... 15 correspond to range -7 ... -1

Of course the configuration with a jump from 7 to -1 is still usable,
but I was thinking if it's possible to overcome it somehow. Any hints
would be appreciated.

Thanks,

Bruno

Re: Problem with crafting values to be sent

2012-08-20 by Royce

Hi Bruno,

> While working on implementation file for SY77 I encountered a problem
> I cannot solve: sending a specific range with sign bit. Long story
> short:
> - values 0 ... 7 correspond to range 0 ... 7
> - value 8 is ignored
> - values 9 ... 15 correspond to range -7 ... -1

This is the standard way to set a negative number.
Look at the bit0 to bit3

0 0000 0 use bit4 1 0000 16
1 0001 1 use bit4 1 0001 ; 17
2 0010 2 use bit4 1 0010 18
3 0011 3 use bit4 1 0011 19
4 0100 4 use bit4 1 0100 20
5 0101 5 use bit4 1 0101 21
6 0110 6 use bit4 1 0110 22
7 0111 7 use bit4 1 0111 23
- 1000 8 use bit4 0 1000 clear bit4
-7 1001 9 use bit4 0 1001 ; ; 9
-6 ; 1010 10 use bit4 0 1010 10
-5 1011 11 use bit4 ; 0 1011 11
-4 1100 12 use bit4 0 1100 12
-3 ; 1101 13 use bit4 0 1101 13
-2 1110 14 use bit4 0 1110 14
-1 1111 15 use bit4 0 1111 15

So you can use val03 to mask off bit4 (bit0 to bit3)
...
.maxmin 9 23
.default 16 ; 0 as far as you are concerned
.tx $F0 sysex header val03 $F7
...

All the best
Royce

Re: [bc2000] Re: Problem with crafting values to be sent

2012-08-20 by Bruno

2012/8/20 Royce <rpcfender@...>
> So you can use  val03 to mask off bit4 (bit0 to bit3)
> ...
> .maxmin 9 23
> .default 16   ; 0 as far as you are concerned
> .tx $F0 sysex header val03 $F7

Thanks Royce, I will check it when I'm back home (Sunday).

Bruno

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