From 10d77ae3a5b1dc25a467524d704d0ee6a21cc672 Mon Sep 17 00:00:00 2001
From: Holger Wirtz <wirtz@parasitstudio.de>
Date: Mon, 28 Aug 2023 11:21:11 +0200
Subject: [PATCH] Initial commit with first untested code.

---
 MIDI-Host-Adapter.ino | 79 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 MIDI-Host-Adapter.ino

diff --git a/MIDI-Host-Adapter.ino b/MIDI-Host-Adapter.ino
new file mode 100644
index 0000000..40c1573
--- /dev/null
+++ b/MIDI-Host-Adapter.ino
@@ -0,0 +1,79 @@
+#include <TM1638plus_Model2.h>
+#include <elapsedMillis.h>
+#include <limits.h>
+
+#define STROBE_TM 9
+#define CLOCK_TM 8
+#define DIO_TM 7
+#define MIDI_CH_BIT3 5
+#define MIDI_CH_BIT2 4
+#define MIDI_CH_BIT1 3
+#define MIDI_CH_BIT0 2
+
+bool swap_nibbles = false;
+bool high_freq = false;
+
+#define BRIGHTNESS 6
+#define BUTTON_DEBOUNCE_TIME_MS 50
+
+// Constructor object
+TM1638plus_Model2 tm(STROBE_TM, CLOCK_TM, DIO_TM, swap_nibbles, high_freq);
+elapsedMillis button_debounce_timer;
+
+void setup() {
+  Serial.begin(9600);
+  delay(100);
+
+  Serial.println("<SETUP>");
+
+  tm.displayBegin();
+  tm.brightness(BRIGHTNESS);
+  tm.DisplayStr("MIDIHOST", 0);
+
+  pinMode(MIDI_CH_BIT3, OUTPUT);
+  pinMode(MIDI_CH_BIT2, OUTPUT);
+  pinMode(MIDI_CH_BIT1, OUTPUT);
+  pinMode(MIDI_CH_BIT0, OUTPUT);
+  digitalWrite(MIDI_CH_BIT3, LOW);
+  digitalWrite(MIDI_CH_BIT2, LOW);
+  digitalWrite(MIDI_CH_BIT1, LOW);
+  digitalWrite(MIDI_CH_BIT0, LOW);
+
+  delay(500);
+
+  Serial.println("</SETUP>");
+}
+
+void loop() {
+  uint8_t button;
+
+  button = tm.ReadKey16();
+  if (button > 0 && button_debounce_timer > BUTTON_DEBOUNCE_TIME_MS) {
+    Serial.print("Button: ");
+    Serial.println(button, DEC);
+    button_debounce_timer = 0;
+    tm.DisplayDecNum(button, 0, false, TMAlignTextRight);
+
+    SetMidiChannel(button);
+  }
+}
+
+void SetMidiChannel(uint8_t channel) {
+  Serial.print("Setting MIDI channel: ");
+  Serial.print(channel, DEC);
+  Serial.print(" (");
+  printBinary(channel, 4);
+  Serial.println(")");
+
+  digitalWrite(MIDI_CH_BIT0, channel & 0x00);
+  digitalWrite(MIDI_CH_BIT1, channel & 0x01);
+  digitalWrite(MIDI_CH_BIT2, channel & 0x02);
+  digitalWrite(MIDI_CH_BIT3, channel & 0x08);
+}
+
+void printBinary(uint32_t value, uint8_t len) {
+  for (len; len >= 0; len--) {
+    Serial.print((char)('0' + ((value >> len) & 1)));
+  }
+  Serial.println();
+}
\ No newline at end of file