Add PCA9685 LED killer

tx/kill_leds.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+#
+#   PCA9685 LED Kill
+#
+#   Shutdown all LEDs on a particular daughterboard in use in some Wenet Payloads
+#   that has 3x LEDs that are always powered up on boot...
+#
+#   LEDs are attached to PCA9685 LED pins 0-8
+#
+#   Dependencies:
+#   sudo pip3 install adafruit-circuitpython-pca9685
+#   Then enable I2C in raspi-config
+#
+#   Add to /etc/rc.local to run on boot.
+#   python3 /home/pi/wenet/tx/kill_leds.py
+
+from board import SCL, SDA
+import busio
+
+# Import the PCA9685 module.
+from adafruit_pca9685 import PCA9685
+
+ADDRESS = 0x55
+LED_NUMBERS = [0,1,2,3,4,5,6,7,8]
+LED_SETTING = 0xFFFF
+
+# Create the I2C bus interface.
+i2c_bus = busio.I2C(SCL, SDA)
+
+# Create a simple PCA9685 class instance.
+pca = PCA9685(i2c_bus,address=ADDRESS)
+
+# Set the PWM frequency to 60hz.
+pca.frequency = 60
+
+# LEDs are low-side switched, to set to 0xFFFF to turn off completely.
+for _led in LED_NUMBERS:
+    pca.channels[_led].duty_cycle = LED_SETTING
+
+print("LEDs disabled.")