From 739e828c0ba6eaf908a28afc5df236d214a5508f Mon Sep 17 00:00:00 2001
From: heck <heck@pep.foundation>
Date: Tue, 13 Sep 2022 16:25:09 +0200
Subject: [PATCH] init

---
 Makefile  |  7 ++++++
 blinky.py | 13 ++++++++++
 code.py   | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 Makefile
 create mode 100644 blinky.py
 create mode 100644 code.py

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ffb18ad
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+
+.PHONY: all
+
+all: flash
+
+flash:
+	cp code.py /Volumes/CIRCUITPY/
\ No newline at end of file
diff --git a/blinky.py b/blinky.py
new file mode 100644
index 0000000..ce8a765
--- /dev/null
+++ b/blinky.py
@@ -0,0 +1,13 @@
+# import board
+# import digitalio
+# import time
+#
+# led = digitalio.DigitalInOut(board.LED)
+# led.direction = digitalio.Direction.OUTPUT
+#
+# while True:
+#     print("Hello, CircuitPython!")
+#     led.value = True
+#     time.sleep(0.1)
+#     led.value = False
+#     time.sleep(0.1)
diff --git a/code.py b/code.py
new file mode 100644
index 0000000..f8b0aca
--- /dev/null
+++ b/code.py
@@ -0,0 +1,74 @@
+# MIDI Cable
+# Black - Data
+# White - VCC 3.3v
+# Brown - GND
+
+import time
+import board
+import busio
+import adafruit_midi
+
+from adafruit_midi.control_change import ControlChange
+from adafruit_midi.note_off import NoteOff
+from adafruit_midi.note_on import NoteOn
+
+
+def init():
+    print("init")
+    global midi
+    uart = busio.UART(board.TX, board.RX, baudrate=31250, timeout=0.001)  # init UART
+    midi_in_channel = 2
+    midi_out_channel = 1
+    midi = adafruit_midi.MIDI(
+        midi_in=uart,
+        midi_out=uart,
+        in_channel=(midi_in_channel - 1),
+        out_channel=(midi_out_channel - 1),
+        debug=False,
+    )
+    print("Default output channel:", midi.out_channel + 1)
+
+
+def trig(note_nr):
+    # print("trig: " + str(note_nr))
+    midi.send(NoteOn(note_nr, 127))
+    midi.send(NoteOff(note_nr, 0))
+
+
+def subdiv(clk_bar, clk_bar_old, div, note_nr):
+    div_ns = div_to_ns(div)
+    clk_sub1_old = clk_bar_old % div_ns
+    clk_sub1 = clk_bar % div_ns
+    clk_sub1_diff = clk_sub1 - clk_sub1_old
+    if clk_sub1_diff < 0:
+        trig(note_nr)
+
+
+def div_to_ns(div) -> int:
+    clk_pulse_per_second = 1000000000
+    beat_per_bar = 4
+    bar_ns = beat_per_bar / bpm * 60 * clk_pulse_per_second
+    return bar_ns / div
+
+
+def main():
+    print("main")
+    bar_ns = div_to_ns(1)
+
+    clk_bar = time.monotonic_ns() % bar_ns
+    while True:
+        clk_bar_old = clk_bar
+        clk_bar = time.monotonic_ns() % bar_ns
+
+        # for i in range(1,4):
+        #     subdiv(clk_bar, clk_bar_old, i, 36+i)
+        subdiv(clk_bar, clk_bar_old, 1, 36)
+        subdiv(clk_bar, clk_bar_old, 2, 37)
+        subdiv(clk_bar, clk_bar_old, 4, 38)
+        subdiv(clk_bar, clk_bar_old, 8, 39)
+        subdiv(clk_bar, clk_bar_old, 16, 40)
+
+bpm = 80
+
+init()
+main()