updates

20230527122415-digital_audio_switch.org

@@ -39,13 +39,24 @@
 - VCC
 - GND
 ** Digital Analog Converter (PCM5102)
-*** Pins
+Communicates via the [[id:8f2e7b85-ede4-486b-ae5e-e36dd568552a][I2S]] protocol.
 *** Pins
 - BCK
 - DIN
 - LRCK
 - VCC
 - GND
+#+begin_comment
+sck_pin = Pin(14)   # Serial clock output
+ws_pin = Pin(13)    # Word clock output
+sd_pin = Pin(12)    # Serial data output
+#+end_comment
+| DAC Pin | I2S Counterpart                                           | Pin  |
+|---------+-----------------------------------------------------------+------|
+| LRCK    | Word Clock (Word Select (WS) / Left-Right Clock (LRCLK))) | IO27 |
+| DIN     | Multiplexed Data Line (Serial Data (SD))                  | IO26 |
+| BCK     | Bit Clock (Continuous Serial Clock / SCK)                 | IO25 |
+| SCK     | Master Clock (not part of the I2S standard)               | GND  |
 
 *** Wiring notes
 [[https://raspberrypi.stackexchange.com/a/94951/154943]]
@@ -61,7 +72,7 @@ On the back (non-component side) there are 4 sets of 3 pads for the 4 functions:
 - XSMT :: Soft mute control(1): Soft mute (Low) / soft un-mute (High)
 - FMT :: Audio format selection : I2S (Low) / Left justified (High)
 
-The centre pad is connected to the corresponding pin. Each of these function pads may be bridged with solder either high or low (or the pins connected to +3.3V / 0V). (My board is supplied with 1, 2 & 4 bridged low and 3 bridged high, i.e. normal latency filter, 44.1kHz de-emphasis disabled, soft-mute not asserted, I2S audio format.)
+The centre pad is connected to the corresponding pin. Each of these function pads may be bridged with solder either high or low (or the pins connected to +3.3V / 0V). (My board is supplied with 1, 2 & 4bridged low and 3 bridged high, i.e. normal latency filter, 44.1kHz de-emphasis disabled, soft-mute not asserted, I2S audio format.)
 
 The normal filter is an FIR with good response, delaying the signal by approx. 500us (at 44.1 kHz) which should be fine. The fast filter is an IIR with slightly poorer response and delays the signal approx. 80us. Very few (if any) audio sources have pre-emphasis applied so DEMP should be low. The XSMT pin would allow muting of the output via a GPI (if the solder bridge was removed). Raspberry Pi supports I2S bitstream so FMT should be low.
 

20230617144117-create_a_pulseaudio_network_sink.org

@@ -5,5 +5,5 @@
 
 #+begin_src sh :results silent
   pactl load-module module-null-sink sink_name=Network sink_properties=device.description=Network
-  pactl load-module module-simple-protocol-tcp rate=48000 format=s16le channels=2 record=true port=8001 source=null-sink.monitor
+  pactl load-module module-simple-protocol-tcp rate=22050 format=s16le channels=2 record=true port=8001 source=null-sink.monitor
 #+end_src

20230626171739-i2s.org

@@ -0,0 +1,5 @@
+:PROPERTIES:
+:ID:       8f2e7b85-ede4-486b-ae5e-e36dd568552a
+:END:
+#+title: I2S
+Inter-IC Sound Bus Protocol

20230627235323-xmage.org

@@ -0,0 +1,27 @@
+:PROPERTIES:
+:ID:       01663abf-a6c3-434d-a710-bcbcddfdcc1e
+:END:
+#+title: XMage
+An open-source implementation of [[id:d5efa5bd-dac9-4ef5-b352-a2b794a37bd0][Magic: The Gathering]].
+* Developing
+** Requirements
+- JDK 1.8+
+- Maven
+
+Ensure the correct JDK is set:
+: export JAVA_HOME=/usr/lib/jvm/java-8-openjdk
+
+To build, use:
+: mvn clean install -DskipTests
+
+To run the server:
+#+begin_src sh
+  cd Mage.Server
+  mvn exec:java -Dexec.mainClass=mage.server.Main
+#+end_src
+
+To run the client:
+#+begin_src sh
+  cd Mage.Client
+  mvn exec:java -Dexec.mainClass=mage.client.MageFrame
+#+end_src