Introduction to .NET Micro Framework Christopher Fairbairn ARANZ Medical Ltd [email_address]

The Device Landscape Windows Mobile, Pocket PC, SmartPhone, Windows CE Windows XP, Windows Vista, Windows XP Embedded Remote Controls , Wearable Devices, Auxiliary Displays Increasing functionality .NET Micro Framework .NET Compact Framework .NET Framework

Tahoe Development Board 35mm x 35mm processor module 4MB Flash, 8MB SDRAM 100Mhz ARM920T Processor www.devicesolutions.net

35mm x 35mm processor module

4MB Flash, 8MB SDRAM

100Mhz ARM920T Processor

.NET Micro Framework Smart Personal Object Technology (SPOT) .NET Runtime in 300KB Supports X86, ARM7, ARM9, M68K

Smart Personal Object Technology (SPOT)

.NET Runtime in 300KB

Supports X86, ARM7, ARM9, M68K

C# experience VS 2005 Standard Edition .NET Micro Framework SDK A real device .NET MF - Requirements

Porting the .NET MF native User Applications and Libraries BCL .NET WPF Comms … CLR Execution Engine Type System Garbage Collector Interop PAL Timers RAM IO … Application Layer Class Library Layer Runtime Component Layer Hardware Layer Processor and Peripherals HAL OS or Drivers Facilities managed

Compiling for the .NET MF Supports CLS and CIL C# only No generics Minimal assembly validation Secure bootloader C# Source .NET Assembly .NET Micro Framework Assembly Device C# Compiler Metadata Processor Deployment

Supports CLS and CIL

C# only

No generics

Minimal assembly validation

Secure bootloader

Hello World 1974 Bell Laboratories memo by Brian Kernighan main() { printf(“hello, world”); }

1974 Bell Laboratories memo by Brian Kernighan

Hello World OutputPort led = new OutputPort(Meridian.Pins.GPIO5, true); while (true) { Thread.Sleep(5000); led.Write(!led.Read()); }

DEMO The development process

Group Project Kitchen Timer Push buttons Tilt to pause Logging

Kitchen Timer

Push buttons

Tilt to pause

Logging

GPIO and Interrupts pin = new InterruptPort(Tahoe.Pins.SW9, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdge); pin.OnInterrupt += Pin_OnInterrupt; pin = new InputPort(Tahoe.Pins.SW9, Port.ResistorMode.PullUp); bool state = pin.Read(); pin = new OutputPort(Tahoe.Pins.SW9, true, Port.ResistorMode.PullDown); pin.Write(true); InputPort OutputPort InterruptPort

.NET MF GUI Support Improves with each release Inspired by WPF

Improves with each release

Inspired by WPF

Drawing Primitives Bitmap bmp = new Bitmap(SystemMetrics.ScreenWidth, SystemMetrics.ScreenHeight); bmp.DrawRectangle( red, // outline colour 10, // outline thickness 20, 30, // x, y 40, 50, // width, height 0, // xCornerRadius 0, // yCornerRadius 0, 0, 0, 0, 0, 0, 0); bmp.Flush(); // copy bitmap to LCD

Drawing Primitives Object Orientated Scene description No declarative markup (XAML) Rectangle rect = new Rectangle(); rect.Width = 40; rect.Height = 50; rect.Fill = new SolidColorBrush(Color.Black); rect.Stroke = new Pen(Color.White, 10);

Object Orientated

Scene description

No declarative markup (XAML)

Creating Windows Static Controls Text, Bitmap Content Controls Border, ListBoxItem Container Controls Canvas, StackPanel, ScrollViewer Bitmap Fonts

Static Controls

Text, Bitmap

Content Controls

Border, ListBoxItem

Container Controls

Canvas, StackPanel, ScrollViewer

Bitmap Fonts

DEMO Creating the basic Kitchen Timer Application

Interfacing Custom Hardware Direct hardware access considered “unsafe” Managed interfaces GPIO Serial I2C SPI More options for porting partners PWM

Direct hardware access considered “unsafe”

Managed interfaces

GPIO

Serial

I2C

SPI

More options for porting partners

PWM

Tahoe Accelerometer Module Analogue Accelerometer chip I 2 C based ADC Managed Device Driver

Analogue Accelerometer chip

I 2 C based ADC

Managed Device Driver

Input Manager Coordination of all input devices for WPF Turns raw input into WPF events Helper methods Buttons.IsButtonUp(Button.Pause);

Coordination of all input devices for WPF

Turns raw input into WPF events

Helper methods

Buttons.IsButtonUp(Button.Pause);

DEMO Adding tilt support

Weak References A way to alter GC behavior Useful for implementing caches

A way to alter GC behavior

Useful for implementing caches

Weak References A way to alter GC behavior Useful for implementing caches WeakReference wr = new WeakReference(new SomeClass()); SomeClass foo = wr.Target as SomeClass; if (foo == null) foo = new SomeClass();

A way to alter GC behavior

Useful for implementing caches

Extended Weak References Persists objects to EEPROM Can recover objects after device restarts SurviveBoot SurvivePowerDown Storage Priorities

Persists objects to EEPROM

Can recover objects after device restarts

SurviveBoot

SurvivePowerDown

Storage Priorities

DEMO Creating a log of Kitchen Timer usage

bansky.net/blog www.microframework.cz .NET Micro Framework Team Blog microsoft.public.dotnet.framework.microframework Getting Started

bansky.net/blog

www.microframework.cz

.NET Micro Framework Team Blog

microsoft.public.dotnet.framework.microframework

Contact Information Christopher Fairbairn ARANZ Medical Ltd Questions? Email: [email_address] Website: www.christec.co.nz/blog/