Add support for software reset of the teensy

v2/backend/arduino/VideoDisplayTeensy31/VideoDisplayTeensy31.ino

@@ -71,6 +71,11 @@ const int config = WS2811_800kHz; // color config is on the PC side
 
 OctoWS2811 leds;
 
+// Required for soft reboot
+#define RESTART_ADDR       0xE000ED0C
+#define READ_RESTART()     (*(volatile uint32_t *)RESTART_ADDR)
+#define WRITE_RESTART(val) ((*(volatile uint32_t *)RESTART_ADDR) = (val))
+
 void setup() {
   pinMode(13, OUTPUT);
   digitalWrite(13, HIGH);
@@ -96,7 +101,11 @@ void loop() {
     digitalWrite(13, HIGH);
     leds.show();
     digitalWrite(13, LOW);
-  } else if (startChar >= 0) {
+  }
+  else if (startChar == '!') {
+    WRITE_RESTART(0x5FA0004);
+  }
+  else if (startChar >= 0) {
     // discard unknown characters
   }
 }

v2/backend/forwarding/forward.py

@@ -3,6 +3,7 @@
 import redis
 import time
 from serial import Serial, SerialException
+from serial.tools import list_ports
 import sys
 import os
 
@@ -11,7 +12,7 @@ max_width = 20
 max_framerate = 40
 
 # Use dummy to test the Processing code without have access to actual hardware
-serialDevice = 'dummy'
+# serialDevice = 'dummy'
 
 # OSX serial device for teensy (not the same everywhere but gives a good indications what it might look like)
 # serialDevice = '/dev/tty.usbmodem807701'
@@ -19,6 +20,10 @@ serialDevice = 'dummy'
 # Linux Serial device
 # serialDevice = '/dev/ttyACM0'
 
+# Automatically find the first serial port used, works on Linux. TODO: test on other OSes
+# Required if you want to reboot the teensy
+serialDevice = 'auto'
+
 wait_time = None
 
 
@@ -44,6 +49,23 @@ def send(r, s):
         time.sleep(end - now)
 
 
+def reboot(port_name):
+    ser = Serial()
+    ser.port = port_name
+    ser.open()
+    # Send reboot command
+    ser.write(ord('!').to_bytes(4, byteorder='little'))
+    ser.close()
+    time.sleep(3)
+
+
+def find_serial():
+    for path, name, details in list_ports.comports():
+        if details != 'n/a':
+            return path
+    raise Exception('No open ports found.')
+
+
 def serialConfigure(port_name, baudrate=9600):
     '''
         We use a very low baudrate by default because the USB port on the teensy
@@ -54,6 +76,13 @@ def serialConfigure(port_name, baudrate=9600):
         time.sleep(1)
         ser = 'dummyMode'
         return ser
+    elif port_name == 'auto':
+        print("Auto detected, search for open port")
+        port_name = find_serial()
+        print("Port found: ", port_name, ' reboot.')
+        reboot(port_name)
+        port_name = find_serial()
+        print("Done, new port: ", port_name)
 
     ser = Serial()
     ser.port = port_name

v2/backend/forwarding/softReset.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from serial import Serial, SerialException
+import sys
+
+# OSX serial device for teensy (not the same everywhere but gives a good indications what it might look like)
+# serialDevice = '/dev/tty.usbmodem807701'
+
+# Linux Serial device
+serialDevice = '/dev/ttyACM1'
+
+if __name__ == "__main__":
+    ser = Serial()
+    ser.port = serialDevice
+    try:
+        ser.open()
+        ser.timeout = 1
+        ser.write(ord('!').to_bytes(4, byteorder='little'))
+    except SerialException as e:
+        sys.stderr.write("Could not open serial port %s: %s\n" % (ser.portstr, e))