Microchip dsPIC Digital Signal Controllers Senior Design Project 2005 Super-Mileage Fuel Injection Team

Micro-Controllers In Our Project (I) We will require a primary processor to implement our feedback control system. 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 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. It will need to perform certain math operations in hardware and with few instructions. Development Options must include high level language compilers. Development Options must include high level language compilers. Programming options must include a portable PC-Controlled Option. Programming options must include a portable PC-Controlled Option.

Micro-Controllers In Our Project (II) We will also require a microcontroller to control a data storage and retrieval scheme. 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. 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.

What are the Options? Feedback Control System Feedback Control System –Motorola DSP56xxx series –Microchip dsPIC series –Amtel, Analog Devices, Others Why DSP anyway? Benefits? Pitfalls? 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

What if we used a lower end controller? Microchip 16 and 18 series as example 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 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

The Pitch The Front Runner: Microchip dsPIC series The Front Runner: Microchip dsPIC series -Three families: Electronic Motor Control, Sensor Family, General Purpose Family Benefits 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