Search found 54 matches

by deetee
Tue Mar 14, 2023 11:47 am
Forum: DM42
Topic: When to replace DM42 Battery?
Replies: 4
Views: 2734

Re: When to replace DM42 Battery?

I drained my battery as much as possible and ended at 1760 mV.

It still calculates, but with a little more "power stress" (ie entering the OFF/Suspend mode) the calculator remains in some undefined state (display flickers) and even needs the power grid to reset.

Regards
deetee
by deetee
Thu Feb 23, 2023 2:37 pm
Forum: Developer Forum
Topic: BMP-file format for DM42 - and compatibility to ie GIMP
Replies: 6
Views: 2002

Re: BMP-file format for DM42 - and compatibility to ie GIMP

Thanks so far. At least my concerns regarding to write proprietary file formats are gone. But it seems to become a GIMP usage problem - and the "colorspace bug of GIMP" seems to be a wellknown problem. When indexed to 1-bit there is no BMP export option to prevent writing colorspace. I tri...
by deetee
Thu Feb 23, 2023 1:45 pm
Forum: Developer Forum
Topic: BMP-file format for DM42 - and compatibility to ie GIMP
Replies: 6
Views: 2002

Re: BMP-file format for DM42 - and compatibility to ie GIMP

Thanks for your fast help: * I tried MS-Paint but obiously with a wrong palette - thanks - at least this works. * I managed to select in GIMP the Image>Mode>Indexed Options "Use black and white ..." and "Remove unused colors ...". But when doing the ExportAs and selecting the Fil...
by deetee
Thu Feb 23, 2023 11:36 am
Forum: Developer Forum
Topic: BMP-file format for DM42 - and compatibility to ie GIMP
Replies: 6
Views: 2002

BMP-file format for DM42 - and compatibility to ie GIMP

Hello! I'm trying to write a program for the DM42 that uses some pixel oriented graphics (some kind of very simple Powerpoint/Photoshop application). Central part of this is a 100x48 pixel monochrome image format which should be compatible with the BMP image file format specifications (similar to th...
by deetee
Thu Feb 16, 2023 12:05 pm
Forum: DM42
Topic: When to replace DM42 Battery?
Replies: 4
Views: 2734

Re: When to replace DM42 Battery?

Good question. I made tests with the DMCP function read_power_voltage(). When there is power via USB this function delivers stable 3051 (mV) My battery is quite drained but still works fine with 2064 (mV) There is also a function get_lowbat_state() which signals a low battery, but I couldn't find a ...
by deetee
Mon Dec 05, 2022 6:51 am
Forum: Developer Forum
Topic: RACK42 (Version 2) - A Spreadsheet (and more) for the DM42
Replies: 0
Views: 2463

RACK42 (Version 2) - A Spreadsheet (and more) for the DM42

Hi! I proudly present version 2 of RACK42 - the spreadsheet application (and more) for the DM42 hardware. What started as an "experiment" (see https://forum.swissmicros.com/viewtopic.php?f=20&t=3302 ) became my favor DM42-application (even if there is IV42). For more information have a...
by deetee
Thu Nov 17, 2022 6:41 am
Forum: Developer Forum
Topic: Memory used by DMCP
Replies: 1
Views: 1739

Re: Memory used by DMCP

Maybe that helps:

There is some memory allocation in the linker file stm32_program.ld:
FLASH 704k
RAM 8k
QSPI 2048k

In my file is also a commented allocation with RAM 96k.

I never touched this numbers - for big data areas I use malloc.

Regards
deetee
by deetee
Mon Nov 14, 2022 10:24 am
Forum: DM42
Topic: Spreadsheet for DM42?
Replies: 10
Views: 5388

Re: Spreadsheet for DM42?

Hi Jim! Thank you for your kind words and ideas. What started as an experiment (at least for me) became my favorite DM42 application. I don't know, if you saw it, but RACK42 is discussed on two other location ( https://forum.swissmicros.com/viewtopic.php?f=20&t=3302 and https://www.hpmuseum.org/...
by deetee
Mon Sep 12, 2022 9:15 am
Forum: Developer Forum
Topic: RACK42 - A Spreadsheet Application for the DM42
Replies: 9
Views: 3416

Re: RACK42 - A Spreadsheet Application for the DM42

ThirdPoliceMan wrote:
Sun Sep 11, 2022 12:21 pm
The error has been found. I will describe the cause shortly.
Great - I'm really relieved. What caused the error?

Regards
deetee
by deetee
Fri Sep 09, 2022 11:43 am
Forum: Developer Forum
Topic: RACK42 - A Spreadsheet Application for the DM42
Replies: 9
Views: 3416

Re: RACK42 - A Spreadsheet Application for the DM42

I will load it on a dm42 to take to HHC to show around. Dear Bob! thanks for promoting RACK42 at the HHC. It's a great honor for me, that my software participates the HHC 2022 (this weekend in Nashville?). Just now I put a recent version of RACK42 on github ( https://github.com/zooxo/rack42 ) named...