VDI-RODERICO

[kroman01]

v2.2 software for KS0108 and S6B0108 works on the display with RA8808 controller but after negation of CS1 and CS2 using SN74HC14

[roderico]

I don't fully understand, does KS0108+SN74HC14 work in the same display as S6B0108+SN74HC14?

[kroman01]

I used KS0108 and S6B0108 and it doesn't work, but when I use SN74HC14 in CS1 and CS2, no problem if the KS0108 and S6B0108 controllers are the same, because if I use the version KS0108 on the display with S6B0108, it works fine

[roderico]

KS0108 and S6B0108 are the two variants for CS1 and CS2 of v2.1 but with different names, try with KS0108 firmware then it should work with RA8808 controller

[kroman01]

I used S6B0108 and it doesn't work with RA8808 controller, you previously compiled test version 2.1 and it worked

[roderico]

hey roderico, can you compile version 2.2 for KS0108, negating CS1 and CS2

hi it's the S6B0108 firmware in v2.2 zip files

[kroman01]

hey roderico, can you compile version 2.2 for KS0108, negating CS1 and CS2

[waltr]

Thanks Roderico.
Made the change in the source which is easier than redoing the pin out defs.

[roderico]

Is this bug in the 2.2b2 code?
And if yes which code module?

the bug is for all versions less or equal to 2.2 (there were many changes in the code from v2.2b2 to v2.2), if you have version 2.2 you only need to change two lines in main.c

t1 = t0 + 4u;
if(t1 > 127) break;

to

t1 = t0 + 3u;
if((j+1)%4 == 0) ++t1;

[waltr]

I ordered PCB today !!
I put gerbers here if someone want it.
[ATTACH]50359[/ATTACH]
[ATTACH]50360[/ATTACH]

Great. Will wait for you to get it and report.

[Albdelafar]

I ordered PCB today !!
I put gerbers here if someone want it.
VDI roderico V2.2 with 3.3V.zip
IDX PRO Albdelafar.zip

[waltr]

I forgot to fix a rounding error in time base that causes last 8 values not to be shown in scope view in v2.2, I have rebuilt glcd firmwares but not changed version number since it is a minor bug and no update is needed but the fix is included in v2.2

Is this bug in the 2.2b2 code?
And if yes which code module?

[waltr]

Thanks for advices and for this fix roderico !!
Do you think I can put C8 like this on the bottom side like waltr said ?
[ATTACH]50343[/ATTACH]
You use ceramic capacitor for by-pass right ?

Ceramic caps-yes.
I was not thinking of adding holes with the caps on the bottom. Nice idea.
I was thinking of simply soldering the caps to the op-amp pins that extend through the pcb. I like your idea.
The caps can be bent over to lay onto the pcb reduce the height below the pcb.

Having the caps directly on the op-amp pins is best as it reduces the amount of trace length which would add resistance and inductance.

[roderico]

of course, waltr explained it better than me and he also has a working SDD1305/3.3V version, multilayer ceramic capacitors for C7 and C8 would work fine, see picture of v2.1 as an example https://www.geotech1.com/forums/atta...8&d=1562773837 , you can also make some room to place C8 capacitors close to power pins

[Albdelafar]

Thanks for advices and for this fix roderico !!
Do you think I can put C8 like this on the bottom side like waltr said ?

You use ceramic capacitor for by-pass right ?