Embedded Systems

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Embedded Systems

• Introduction
• CS423
• Dick Steflik

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Embedded Systems

• Products with included processing elements
• not general purpose computing platforms
• Special purpose computing platforms
• System On a Chip (SoC)?
• microcontrollers
• ARM
• microprocessors
• RISC - PowerPC
• INTEL - 808x
• Single board computers
• PC104
• Mini ITX, Pico ITX

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Classifications

• Small Scale
• use a single 8 or 16 bit microcontroller, no OS,
  development usually done in C
• Medium Scale
• usually 1 or 2, 16 or 32 bit microcontrollers,
  DSPs or RISC processors, a RTOS, usually a suite
  of development tools
• Large scale
• many processors, complex connections and
  dependancies, multiple languages and OSs

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Small Scale Examples

• Test equipment
• Digital volt-ohm meters
• Inductance Capacitance meters
• Handheld games and electronic toys (robots)?
• Cheap cell phones
• LCD panel controllers
• Higher level electronic components (Blinkm)?
• Robots (roomba)?

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Medium Scale Examples

• High level game platforms (Xbox, PSP, PS2)?
• Digital Picture Frames
• Consumer grade Routers (D-Link, Linksys)?
• Smartphones
• GPS Devices
• PDAs
• Cameras (still and video)

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Software Development

• Usually done on a host computer
• windows is most common
• Linux is also popular
• Method
• develop (compile, link and build) on host
• download into target
• test and debug on target or on host based
  simulator
• Toolchains
• set of development tools for the target platform
• sometimes provided by OEM, sometimes from GNU

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Languages

• C is most common
• since most systems are memory and file system
  constrained, C is too bloated
• Jazelle architecture provides native Java
• Assembler is a common way of forcing a large
  program into a small space but only as a last
  resort
• Basic mostly on PIC microcontrollers

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