5 files changed, 178 insertions, 0 deletions
diff --git a/ledctl/Makefile b/ledctl/Makefile
new file mode 100644
index 0000000..2777bb8
--- /dev/null
+++ b/ledctl/Makefile
@@ -0,0 +1,5 @@
+install:
+	install -m 744 ledctl.py /usr/bin/ledctl
+	ln -sf /usr/bin/ledctl /usr/lib/systemd/system-shutdown/
+	install -m 644 systemd/led-boot.service /etc/systemd/system/led-boot.service
+	install -m 644 systemd/led-ready.service /etc/systemd/system/led-ready.service
diff --git a/ledctl/README.md b/ledctl/README.md
new file mode 100644
index 0000000..30c8b8a
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+++ b/ledctl/README.md
@@ -0,0 +1,21 @@
+# ledctl
+
+A simple Python script to control a WS2812B LED or LED strip connected to a rasperry pi.
+systemd services are included to set the LED color depending on the current boot status.
+
+## Prerequisites
+
+Python 3
+The AdaFruit CircuitPython NeoPixel library
+
+## Configuration
+
+Blacklist the snd_bcm2835 module
+Edit /boot/config.txt and comment out dtparam=audio=on
+
+## Installation
+
+```
+sudo make install
+```
+
diff --git a/ledctl/ledctl.py b/ledctl/ledctl.py
new file mode 100644
index 0000000..da42efa
--- /dev/null
+++ b/ledctl/ledctl.py
@@ -0,0 +1,132 @@
+#!/usr/bin/python
+
+import argparse
+import board
+import neopixel
+import time
+
+from os.path import exists
+
+# parse command line arguments
+
+# TODO parse multiple LEDs e.g. ./ledctl --led 1 red --led 2 white 
+
+parser = argparse.ArgumentParser(description='Set LED colors')
+
+parser.add_argument('--led', type=int, help='LED number to control, starting at 1')
+parser.add_argument('color', type=str, help='color or command')
+
+args = parser.parse_args();
+
+# initialize LED array
+leds_max = 1
+leds_num = 0
+leds_array = neopixel.NeoPixel(board.D18, leds_max)
+
+# restore LED array from state file
+statefile = '/tmp/ledctl.state'
+
+if exists(statefile):
+    #print('reading ' + statefile)
+
+    with open(statefile, 'r') as f:
+        lines = f.readlines()
+        i = 0;
+        for line in lines:
+            values = [ int(number) for number in line.rstrip().split(' ')]
+            if (i < leds_max):
+                leds_array[i] = (values[0], values[1], values[2]);
+            i = i + 1
+        f.close()
+
+# figure out if we want to control a single LED or all of them
+if args.led:
+    if (args.led < 1) or (args.led > leds_max):
+        parser.error("led must be within range")
+    else:
+        leds_num = args.led;
+
+# default color is white
+leds_color = (255, 255, 255)
+
+def rgbval(colorname):
+    switch = {
+            'on': (255, 255, 255),
+            'off': (0, 0, 0),
+            'white': (255, 255, 255),
+            'black': (0, 0, 0),
+            'red': (255, 0, 0),
+            'green': (0, 255, 0),
+            'blue': (0, 0, 255),
+            'yellow': (255, 255, 0),
+            'cyan': (0, 255, 255),
+            'pink': (255, 0, 255),
+            'boot': (63, 15, 0),
+            'reboot' : (63, 15, 0),
+            'ready': (0, 15, 0),
+            'halt' : (0, 0, 0),
+            'poweroff' : (0, 0, 0),
+            'kexec' : (63, 0, 63),
+            }
+    return switch.get(colorname, (255, 255, 255))
+
+def hexval(letter):
+    switch = {
+            '0': 0,
+            '1': 1,
+            '2': 2,
+            '3': 3,
+            '4': 4,
+            '5': 5,
+            '6': 6,
+            '7': 7,
+            '8': 8,
+            '9': 9,
+            'A': 10,
+            'a': 10,
+            'B': 11,
+            'b': 11,
+            'C': 12,
+            'c': 12,
+            'D': 13,
+            'd': 13,
+            'E': 14,
+            'e': 14,
+            'F': 15,
+            'f': 15,
+            }
+    return switch.get(letter, 0)
+
+if args.color:
+    #print('color ' + args.color)
+    if args.color[:1] == '#':
+        red = 16 * hexval(args.color[1:2]) + hexval(args.color[2:3]);
+        green = 16 * hexval(args.color[3:4]) + hexval(args.color[4:5]);
+        blue = 16 * hexval(args.color[5:6]) + hexval(args.color[6:7]);
+        leds_color = (red, green, blue);
+        #print ('color %d %d %d' % leds_color)
+
+    else:
+        leds_color = rgbval(args.color);
+
+if (leds_num > 0):
+    #print('setting LED %d' % leds_num)
+
+    leds_array[leds_num - 1] = leds_color
+else:
+    #print('setting all LEDs')
+
+    leds_array.fill(leds_color)
+
+# write LED array to state file
+
+#print('writing ' + statefile)
+
+with open(statefile, 'w') as f:
+    for i in range(leds_max):
+        for c in range(3):
+            f.write ('%d ' % leds_array[i][c])
+        f.write('\n');
+
+    f.close()
+
diff --git a/ledctl/systemd/led-boot.service b/ledctl/systemd/led-boot.service
new file mode 100644
index 0000000..2414c8f
--- /dev/null
+++ b/ledctl/systemd/led-boot.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=ledctl to indicate boot in progress status.
+After=local-fs.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/ledctl boot
+
+[Install]
+WantedBy=multi-user.target
diff --git a/ledctl/systemd/led-ready.service b/ledctl/systemd/led-ready.service
new file mode 100644
index 0000000..1dc62e9
--- /dev/null
+++ b/ledctl/systemd/led-ready.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=ledctl indicate ready status
+After=multi-user.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/ledctl ready
+
+[Install]
+WantedBy=graphical.target