Microchip dsPIC Digital Signal Controllers

1
Microchip dsPIC Digital Signal Controllers

• Senior Design Project 2005
• Super-Mileage Fuel Injection Team

2
Micro-Controllers In Our Project (I)

• We will require a primary processor to implement
  our feedback control system.
• It will need to have a timed logical output
  triggered by a system interrupt of our choice.
• It will need to perform certain math operations
  in hardware and with few instructions.
• Development Options must include high level
  language compilers.
• Programming options must include a portable
  PC-Controlled Option.

3
Micro-Controllers In Our Project (II)

• We will also require a microcontroller to control
  a data storage and retrieval scheme.
• It must have a sufficient number of output pins
  to send and receive data from memory as well as
  address a virtual memory space of our chosen size.

4
What are the Options?

• Feedback Control System
• Motorola DSP56xxx series
• Microchip dsPIC series
• Amtel, Analog Devices, Others
• Why DSP anyway? Benefits? Pitfalls?
• Higher operand bit count, greater precision in
  calculations
• Does the math operations of interest in a single
  instruction
• Higher potential clock speed
• C Compilers Available
• Might require us to purchase some new programming
  hardware

5
What if we used a lower end controller?

• Microchip 16 and 18 series as example
• -No implementation of certain math apps
• -Higher level language use is more limited
• -Iterative calculation strategy
• -Limited Program Memory
• However, 16/18 series or equivalent will be
  adequate for our sensor data recording system
• Only needs to implement data collection, storage,
  retrieval, and download to a PC via a serial
  connection

6
The Pitch

• The Front Runner Microchip dsPIC series
• -Three families Electronic Motor Control,
  Sensor Family, General Purpose Family
• Benefits
• Uses the same assembly language we are all
  familiar with from undergrad courses
• Implements necessary math
• One-shot PWM with interrupt triggering
• In-Circuit-Serial-Programming