added uxnería and nibble dice tracker pages

src/atom.xml

@@ -5,10 +5,20 @@
 <title>compudanzas: updates</title>
 <author><name>sejo</name></author>
 <generator>a mano</generator>
-<updated>2021-07-06T12:00:00Z</updated>
+<updated>2021-07-12T12:00:00Z</updated>
 <link href='https://compudanzas.net/atom.xml' rel='self'/>
 <link href='https://compudanzas.net/log.html' rel='alternate'/>
 
+<entry>
+<id>https://compudanzas.net/log.html#12021-07-12</id>
+<title>12021-07-12 uxnería</title>
+<updated>2021-07-12T12:00:00Z</updated>
+<link href='https://compudanzas.net/log.html#12021-07-12' rel='alternate'/>
+<summary>
+just published the {uxnería} repo! it has our {uxn} projects and sketches. the project we have been working in the past few days is the {nibble dice tracker}
+</summary>
+</entry>
+
 <entry>
 <id>https://compudanzas.net/log.html#12021-07-06</id>
 <title>12021-07-06 compudanzas workshop, third and fourth sessions</title>

src/darena.gmo

@@ -12,7 +12,7 @@ what will you do with the sand?
 
 # about
 
-darena was developed as an exercise to learn about {postfix} notation and uxn 
+darena was developed as an exercise to learn about {uxn}
 
 => https://wiki.xxiivv.com/site/uxn.html uxn virtual machine and assembly language
 
@@ -46,5 +46,5 @@ use the arrow keys for cartesian movement within the space
 
 this iteration has 31 rocks and a single toggling station where one can switch their color/state.
 
-you can find the code in the 
-=> https://git.sr.ht/~rabbits/uxn/tree/master/item/projects/examples/demos/darena.tal uxn repo
+you can find the code in the {uxnería}
+=> https://codeberg.org/sejo/uxneria uxnería repo

src/log.gmo

@@ -5,6 +5,14 @@ what's happening with compudanzas
 => ./atom.xml [atom feed]
 => ./tw.txt [twtxt]
 
+## 12021-07-12
+
+just published the {uxnería} repo! 
+
+it has our projects and sketches for the {uxn} machine. 
+
+the project we have been working in the past few days is the {nibble dice tracker}
+
 ## 12021-07-06
 
 this past week we had the third and fourth sessions of the online compudanzas workshop {taller de compudanzas} in cuna!

src/low-level.gmo

@@ -8,5 +8,7 @@ writing code closer to the machine(s)
 
 # software
 
+=> ./uxnería.gmi {uxnería}
+=> ./nibble_dice_tracker.gmi {nibble dice tracker}
 => ./darena.gmi {darena}
 => ./avr-asm.gmi {avr-asm}

src/nibble_dice.gmo

@@ -0,0 +1,6 @@
+# nibble dice
+
+6-sided dice that are able to represent all the values of a nibble.
+
+* https://pachapunk.space/nobinario.html no binario - pachapunk
+* https://wiki.xxiivv.com/site/nibble_dice.html XXIIVV nibble dice

src/nibble_dice_tracker.gmo

@@ -0,0 +1,60 @@
+# nibble dice tracker
+
+a 3-channel music tracker based on the {nibble dice} described by maleza.
+
+=> ./img/screenshot_nibble-dice-tracker.png screenshot of the nibble dice tracker: 6 columns of 8 pairs of two dice each
+
+=> https://video.anartist.org/videos/watch/6d2d4a2c-78ef-48c8-abd0-e124451805cb uxn nibble dice tracker - demo video
+
+# interface
+
+the interface consists in 3 sections, one for each audio channel/device.
+
+each section consists in 2 columns. the right column of a section has an indicator for the position of the "beat", and its state (playing or not).
+
+each column consists in 8 bytes.
+
+a byte consists in 2 contiguous nibble dice: the one at the left is the high nibble, and the one at the right is the low nibble.
+
+the bytes in a section map to the following aspects of the tracker and uxn audio device
+
+## first column
+
+* period ( 1 byte ) - how many frames have to happen to trigger a beat. if 0, the device is off
+* pattern ( 8 bits ) - each bit indicates if a note has to be played or not in that beat. bit 0 (least significant bit) corresponds to beat 0, bit 1 to beat 1, and so on.
+* beatcount ( 2 nibbles ) - definition of the beat count behavior. low nibble: how many beats happen in a cycle; if 0, there are no beats. high nibble: beat offset; starting value for the beat count. e.g. if high nibble is 2, and low nibble is 4, the beat count will repeat as 2, 3, 4, 5
+* adsr ( 2 bytes ) - envelope values, as described by the audio device reference
+* volume ( 2 nibbles ) - left and right volume values, as described by the audio device reference
+* sample ( 2 nibbles and 1 byte ) - definition of the sample to be used. high nibble: index of sample to use. low nibble + byte: length of the sample to use
+
+available samples:
+
+* 0: saw
+* 1: main (program code)
+* 2: piano
+* 3: triangular
+
+## second column
+
+* melody ( 8 bytes ) - midi notes corresponding to beats 0 to 7, from top to bottom.
+
+## external notes
+
+=> https://wiki.xxiivv.com/site/uxnemu.html#audio uxn audio device
+=> https://wiki.xxiivv.com/site/midi.html midi notes
+
+
+# controls
+
+* Arrow key up, or 'k' : move cursor to previous byte
+* Arrow key down, or 'j': move cursor to next byte
+* Arrow key left, or 'h': move cursor to previous nibble
+* Arrow key right, or 'l': move cursor to next nibble
+* 'Ctrl' or '+': increment nibble
+* 'Alt' or '-': decrement nibble
+
+# the code
+
+you can find the code in the {uxnería}
+=> https://codeberg.org/sejo/uxneria uxnería repo
+

src/tw.txt

@@ -2,6 +2,7 @@
 # url = https://compudanzas.net/tw.txt
 # url = gemini://compudanzas.net/tw.txt
 #
+2021-07-12T12:00:00-05:00	published the {uxnería} repo for {uxn} projects and sketches. excited about the {nibble dice tracker}!
 2021-07-05T21:00:00-05:00	for the fourth session of the workshop we shared our máquina universal bailable {mub} - it was great to revisit it!
 2021-06-30T21:00:00-05:00	in the third session of the workshop we learned and performed the {danzasistemas-tag} (first time ever!) and a turing machine in {d-turing} mode
 2021-06-28T21:00:00-05:00	second session of the workshop! we performed {reglas de wolfram} and talked a lot about emergent complexity

src/uxn.gmo

@@ -0,0 +1,9 @@
+# uxn
+
+uxn is a little forth machine with 32 instructions.
+
+=> https://wiki.xxiivv.com/site/uxn.html uxn
+
+it uses the {postfix} notation.
+
+our projects and sketches are hosted in the {uxnería}

src/uxnería.gmo

@@ -0,0 +1,25 @@
+# uxnería
+
+experiments with the {uxn} virtual machine and programming language
+
+part of the {s-camino} practice.
+
+# projects
+
+## nibble dice tracker
+
+{nibble dice tracker}: a 3-channel music tracker based on the nibble dice described by maleza.
+
+=> ./img/screenshot_nibble-dice-tracker.png screenshot of the nibble dice tracker: 6 columns of 8 pairs of two dice each
+
+
+## darena
+
+{darena}: an open-ended game of rocks and sand, and/or a simulator for compudanzas
+
+=> ./img/screenshot_darena.png screenshot of the game. it shows a square clear space inside a textured world. inside the square there are several round rocks of two possible colors. there is a small platform, and a person.
+
+
+# code repository
+
+=> https://codeberg.org/sejo/uxneria uxnería repo