PIC -3

This Class: Introduction to Autonomous Microboard

• Next class - hosted mode.

• This class is overview of autonomous mode.

• Most projects expected to use some form of autonomous mode….

What is Autonomous Mode?

• Assembly/Machine or C programming.

• C2C (shareware) & CCS

• Simple instructions.

• Full capability of PIC.

When to be Autonomous

• Response in usec.

• Need full capabilities of PIC.

• Not too computing or data intensive.

• No interface to host needed.

• Low duty cycle (e.g. data logging)

The 87x PIC• Data sheet on

website

• RISC (35 inst.)

• Fast &Cheap

• EEPROM, Flash, RAM

• Programmable

• In-Circuit Pgming

873 - Versatile

• Sleep mode

• Power management

(uA to mA !)

• Timers

• Interrupts

• UART

• Parallel port

• DIO (A,B,C)

• PWM output

• PWM capture

• 10 bit ADC

• SPI

• I2C

Instruction Set• Simple• Portable skill• Program from Sheet (“Fortran”)• Bit intensive• 4k 14 bit words• 1 us/instruction

Bit Banging• Complete data sheet.• Many application

notes, books.• Can code many

operations yourself.• Many placed in

“Modules”• UART• SPI• I2C• USB (devel.)

Assembler Programming• Perhaps alien - but powerful and fast.• From Section 9.1 in manual:

Modules and Debug

• Many modules on PIC

• Much setup & many modes

• Most common modules covered by subroutines in Debug (e.g. hosted mode)

Hacking Debug• Command Sub.• Low-Level Sub.• Definitions

• Parser

Calling a Debug Subroutine

• Section 11.1

• Banks for Data

• Pages for Program

• Simple!

Programming - MPLAB

• Section 9• Assembler• Simulator• Programmer• Freeware(Also GNU, C2C

etc)

Simulating - MPLAB

• Section 10

• Step through program

• Watch memory/ports change.

• Perfect for tracking bugs.

• Limitations: Serial/ADC

Free C Compilers : C2C

C2C • On web • LCD etc. interface

routines available• Easy to adapt and

develop.• Allows inline ASM.• No floats• Not ANSI

• Careful with different devices such as LCDs

• Will need to read data sheets.

• Configurable to most PICs

• No examples yet…

Free C Compilers : Optama

Optama • Demo available on web.• LCD etc. interface

routines available?• Easy to adapt and

develop.• Allows inline ASM?• No floats?• Not ANSI?

• Careful with different devices such as LCDs

• Will need to read data sheets.

• Configurable to most PICs

• USB example…

C Compilers : HiTech

HiTech Demo• 21day from web• LCD etc. interface

routines available.• Easy to adapt and

develop.• Allows inline ASM.• Full floating point!• ANSI

• Careful with different devices such as LCDs

• Will need to read data sheets.

• Configurable to all PICs?

• No examples yet…• Reinstall system after

21d!

C Compilers : CCS

CCS• Purchased (145$)• LCD etc. interface

routines available.• Easy to adapt and

develop.• Allows inline ASM.• Full floating point!• ANSI

• Careful with different devices such as LCDs

• Will need to read data sheets.

• Configurable to all PICs

• Some examples in 401• Now in my lab…

CCS in My Lab• Souped up

Microboard:

20 MHz 877 PIC• C far faster & easier• LCD, Serial, SPI,

ADC, DIO, Steppers, Servos, DAC, Interrupts

• “Real Time OS”

• ‘Bomb’ detectors• Ion thrusters• Robotic fingers• Temperature controllers• DNA detectors

Soon:• Mutation detectors• Launch…

CCS Coding : LCD & Floats#device PIC16F877 *=16 ICD=TRUE#include <defs_877.h>#include <lcd_out.h>void main(void){ ... lcd_init(); q = 0; while(1) { ...lcd_clr_line(1); // advance to line 1printf(lcd_char, " Hello World ");

T_F = 76.6 + 0.015 * ((float) (q)); lcd_clr_line(2); printf(lcd_char, "T_F = %f", T_F);

…Not Bad Eh?

Other Examples

• Telephone Dialing• Temperature• Pressure• SPI devices• I2C devices• EEPROM• Control

• Music Playing• Floating point• …Countless• HiTech site• CCS site• Internet as a whole• C far more portable

CCS in EE401

• Windows version• Integrated into

MPLAB!• Perfect for simulating,

debugging and burning…

• Limited access?

• Linux version• Remote compiles!• Perfect for debugging

from home or?• Unlimited access?

Other Thoughts

• Many methods for using bootloaders with asm or C! (e.g. HiTech site)

• Power management (e.g. data logging)

• USB C code now on web

• Some new RF units (simple and readily available components)

By End of Week• Sketch Proposal

(Friday September 20, 5pm)

• Parts.

• Schematic.

• Objectives.

• Description/Background

• Attribute.

• See website checklist!

Next 2 Weeks

• Prototyping on SK-10s

• Return of Proposals

• Complete Schematic (EAGLE)

• Programming/Interfacing Signoff

• Easy if keep underway.

Guest Lectures Later

• Jerry Kowalyk• Library & Electronic

searches• Background required

in any project report.

Loren Wyard-Scott• PC Layout.• Use of EAGLE.• Instruction on getting

a good PCB layout.• Rules for PCB

submission.

Lectures

Loren Wyard-Scott• Simulation• Tracking bugs• Methods• Limitations• Examples

Schedule

• Easy schedule if regular.

• Don’t let due dates loom!

• Do not underestimate times for:

- design

- parts

- fixes

- software

- integration

- background

- creativity

The Labs

• Office hours are generally in lab.

• Generally in each lab day.

• Approach in lab or after class.

• Arrange time if need be.