diff --git a/README.md b/README.md
index 0f6cef6..cbdffb2 100644
--- a/README.md
+++ b/README.md
@@ -1,19 +1,39 @@
 # micropython-samples
-A place for assorted code ideas for MicroPython.
+A place for assorted code ideas for MicroPython. Most are targeted at the Pyboard variants.
 
-mutex: A class providing mutal exclusion enabling interrupt handlers and the main program to
-access shared data in a manner which ensures data integrity.
+## mutex
+A class providing mutal exclusion enabling interrupt handlers and the main program to access shared
+data in a manner which ensures data integrity.
 
-watchdog: How to access the simpler of the Pyboard's watchdog timers.
+## watchdog
+Access the simpler of the Pyboard's watchdog timers.
 
-reverse: Fast reverse a bytearray.
+## reverse
+Fast reverse a bytearray.
 
-font: Convert a C file produced by GLCD Font Creator to Python for storage as persistent byte code.
+## font
+Convert a C file produced by GLCD Font Creator to Python for storage as persistent byte code.
 
-ds3231_pb: Driver for the DS3231 low cost precison RTC, including a facility to calibrate the
-Pyboard's RTC from the DS3231
+## ds3231_pb
+Driver for the DS3231 low cost precison RTC, including a facility to calibrate the Pyboard's RTC
+from the DS3231.
 
-Buildcheck: Raise an exception if a firmware build is earlier than a given date.
+## Buildcheck
+Raise an exception if a firmware build is earlier than a given date.
+
+## timed_function
+Time a function's execution using a decorator
+
+## fastbuild - Pyboard use under Linux
+Build MicroPython with your frozen bytecode, put the Pyboard into DFU mode, and deploy the build to
+the board with a single command. Takes just over 60 seconds on a fast PC. Note the use of make's j
+argument to use mutliple cores. Empirically 8 gave the fastest build on my core i7 4/8 core laptop:
+adjust to suit your PC.
+
+Includes udev rules to avoid jumps from /dev/ttyACM0 to /dev/ttyACM1: ensures Pyboards of all types
+appear as /dev/pyboard. Also rules for USB connected WiPy and FTDI USB/serial adaptor.
+
+# License
 
 Any code placed here is released under the MIT License (MIT).  
 The MIT License (MIT)  
diff --git a/fastbuild/47-ftdi.rules b/fastbuild/47-ftdi.rules
new file mode 100644
index 0000000..b78fa38
--- /dev/null
+++ b/fastbuild/47-ftdi.rules
@@ -0,0 +1,5 @@
+# FTDI lead 
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{MTP_NO_PROBE}="1" 
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", MODE:="0666"
+KERNEL=="ttyUSB*", ATTRS{idVendor}=="0403", SYMLINK+="ftdi", MODE:="0666"
+
diff --git a/fastbuild/48-wipy.rules b/fastbuild/48-wipy.rules
new file mode 100644
index 0000000..01311b1
--- /dev/null
+++ b/fastbuild/48-wipy.rules
@@ -0,0 +1,6 @@
+# 0403:6015 - WiPy board ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", ENV{ID_MM_DEVICE_IGNORE}="1" 
+# WiPy appears as /dev/wipy
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", ENV{MTP_NO_PROBE}="1" 
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", MODE:="0666"
+KERNEL=="ttyUSB*", ATTRS{idVendor}=="0403", SYMLINK+="wipy", MODE:="0666"
+
diff --git a/fastbuild/49-micropython.rules b/fastbuild/49-micropython.rules
new file mode 100644
index 0000000..4f6ed6b
--- /dev/null
+++ b/fastbuild/49-micropython.rules
@@ -0,0 +1,8 @@
+# f055:9800, 9801, 9802 MicroPython pyboard 
+# Instantiate Pyboard V1.0, V1.1 or Lite as /dev/pyoard
+ATTRS{idVendor}=="f055", ENV{MTP_NO_PROBE}="1"
+ATTRS{idVendor}=="f055", ENV{ID_MM_DEVICE_IGNORE}="1" 
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="f055", MODE:="0666"
+KERNEL=="ttyACM*", ATTRS{idVendor}=="f055", SYMLINK+="pyboard", MODE:="0666", GROUP="adminpete"
+KERNEL=="ttyUSB*", ATTRS{idVendor}=="f055", SYMLINK+="pyboard", MODE:="0666", GROUP="adminpete"
+
diff --git a/fastbuild/pyb_boot b/fastbuild/pyb_boot
new file mode 100644
index 0000000..4feeede
--- /dev/null
+++ b/fastbuild/pyb_boot
@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+# Edit this to match the location of micropython/tools and the Pyboard device
+
+import sys
+sys.path.append('/mnt/qnap2/data/Projects/MicroPython/micropython/tools')
+import pyboard
+def main():
+    pyb=pyboard.Pyboard('/dev/pyboard')
+    pyb.enter_raw_repl()
+    try:
+        pyb.exec_raw('pyb.bootloader()')
+    except:
+        pass
+
+if __name__ == "__main__":
+    main()
+
diff --git a/fastbuild/pybv10_build b/fastbuild/pybv10_build
new file mode 100644
index 0000000..acf8e6f
--- /dev/null
+++ b/fastbuild/pybv10_build
@@ -0,0 +1,6 @@
+#! /bin/bash
+# PYB V1.1 build script for 4/8 Core i7 and frozen bytecode
+# Run from micropython/stmhal
+# edit location of pyb_boot
+make BOARD=PYBV10 clean && make -j 8 BOARD=PYBV10 FROZEN_MPY_DIR=scripts && /mnt/qnap2/Scripts/pyb_boot && make BOARD=PYBV10 deploy
+
diff --git a/fastbuild/pybv11_build b/fastbuild/pybv11_build
new file mode 100644
index 0000000..7675bf6
--- /dev/null
+++ b/fastbuild/pybv11_build
@@ -0,0 +1,6 @@
+#! /bin/bash
+# PYB V1.1 build script for 4/8 Core i7 and frozen bytecode
+# Run from micropython/stmhal
+# edit location of pyb_boot
+make BOARD=PYBV11 clean && make -j 8 BOARD=PYBV11 FROZEN_MPY_DIR=scripts && /mnt/qnap2/Scripts/pyb_boot && make BOARD=PYBV11 deploy
+
diff --git a/timed_function/timed_func.py b/timed_function/timed_func.py
new file mode 100644
index 0000000..5305580
--- /dev/null
+++ b/timed_function/timed_func.py
@@ -0,0 +1,18 @@
+# Time a function call by means of a decorator
+
+import utime
+
+def timed_function(f, *args, **kwargs):
+    myname = str(f).split(' ')[1]
+    def new_func(*args, **kwargs):
+        t = utime.ticks_us()
+        result = f(*args, **kwargs)
+        delta = utime.ticks_diff(t, utime.ticks_us())
+        print('Function {} Time = {:6.3f}ms'.format(myname, delta/1000))
+        return result
+    return new_func
+
+@timed_function
+def test():
+    utime.sleep_us(10000)
+