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Irregular grids
In the past weeks, I wrestled a lot with finding a correct algorithm for the
generation of irregular grids of squares and
equilateral triangles. For a long time, I worked on an algorith that would
generate all possible strings of 'pieces' (the triangles and squares at the
various orientations) from a give string of pieces. But it was only after I
decided to look at the five possible slopes of the lines on the top and bottom
of the strings of pieces and generate all possible strings of slopes from a
given string of slopes, that I succeeded in implementing the working
program irst.cpp this evening. It also groups all strings of slopes into
groups that can reach each other the program finds a total of 455 groups. Many
of these groups have just one or a few elements. There are also groups that
have strings of slopes that have not been investigated (marked with the text
'FAIL'). This is because the strings of slopes are generated by searching all
strings of pieces up to and include a length of twelve that return to the
first element of the string.
Uploading bitstream to FPGA
Yesterday evening at TkkrLab, I talked
about helping out with developing the firmware for the MCH2022 Badge. I am going to look into uploading bitstreams to the FPGA
through the USB connector. The first idea is to add a menu option to the main
menu which listens to the USB connector for a bitstream to be uploaded to the
badge and which when the bitstream is received, uploads it to the FPGA. There
is already code available to upload a bitstream from an SD-card. I will also
have to develop a program for sending a bitstream from a file to the USB. I
had a look at the code of iceprog, the program to upload bitstreams to, for
example, the UPDuino. This program talks to a flash-chip. So, it is not really
applicable. This evening, I spend cloned the firmware repo and build it,
running the Install Prerequisites for ESP-IDF and next using the following commands:
git clone https://github.com/badgeteam/mch2022-firmware-esp32.git
cd mch2022-firmware-esp32/
git submodule init
git submodule update
esp-idf/install.sh
. esp-idf/export.sh
./build.sh
I only found the BADGE.TEAM > ESP32: firmware development > Getting started page
after I did this. I do not know whether this is still up-to-date. I spend some
time studying the code in the 'main' folder and from there also some files in
some other folders.
De vijfde lijn
I finished reading the book De vijfde lijn
(Dutch for The fifth line) which is based on a number of talks between
Steven Aalders (a
Dutch abstract artist) and Robert van Altena (a Dutch art critic). I started
reading the book on February 23. I bought it on January 26. Just like with Peter
Struycken, colour plays a central role in his works. He makes use of
simple shapes, mostly rectangles. Compared to Struycken, it seems to me that
his approach towards colours is more intuitive (based on emotions) whereas
that of Struycken seems to be more rational. On page 36 of the book Struycken
is mentioned along with Jerry Zeniuk (a German artist) and Daniel Buren. On page 237 Aalders makes a remark how Rembrandt in his painting Self-Portrait with Two Circles made use of the four colours from the
Greek antiques: Whites, blacks, ochres and reds. Struycken has studied the use
of these four colours from the Greek antiques through history. On page 192
the book references Sentences on Conceptual Art by Sol LeWitt.
Spruce Street, Berkeley
I have started reading the book A Heartbreaking Work of Staggering Genius. I was reading Chapter 2, where
it mentioned Grotto Rock. After some map searching, it seems that they lived at
876 Spruce Street, Berkeley. The book also mentions the author walking down
Marin Street, but that must be Marin Ave. Although Cragmont Elementary School is just across the street, in the book it says
that they send Toph to Black Pine
Circle. On page 59, there is a mentioning of a nude beach. This could
either be Gray Whale Cove State Beach or a smaller one closer to Montara that is now
closed.
Addition: On Monday, I discovered that Cragmont Elementary School was closed between 1990 and
1999.
This months interesting links
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