PIC -3

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PIC -3
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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.

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What is Autonomous Mode?

• Assembly/Machine or C programming.
• C2C (shareware) CCS
• Simple instructions.
• Full capability of PIC.

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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)

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The 87x PIC

• Data sheet on website
• RISC (35 inst.)
• Fast Cheap
• EEPROM, Flash, RAM
• Programmable
• In-Circuit Pgming

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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

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Instruction Set

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

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Bit Banging

• Complete data sheet.
• Many application notes, books.
• Can code many operations yourself.
• Many placed in Modules
• UART
• SPI
• I2C
• USB (devel.)

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Assembler Programming

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

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Modules and Debug

• Many modules on PIC
• Much setup many modes
• Most common modules covered by subroutines in
  Debug (e.g. hosted mode)

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Hacking Debug

• Command Sub.
• Low-Level Sub.

• Definitions
• Parser

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Calling a Debug Subroutine

• Section 11.1
• Banks for Data
• Pages for Program
• Simple!

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Programming - MPLAB

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

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Simulating - MPLAB

• Section 10
• Step through program
• Watch memory/ports change.
• Perfect for tracking bugs.
• Limitations Serial/ADC

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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

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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

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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!

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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

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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

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CCS Coding LCD Floats

• device PIC16F877 16 ICDTRUE
• include ltdefs_877.hgt
• include ltlcd_out.hgt
• void main(void) ... lcd_init() q 0
• while(1) ...
• lcd_clr_line(1) // advance to line 1
• printf(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?

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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

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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?

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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)

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By End of Week

• Sketch Proposal
• (Friday September 20, 5pm)
• Parts.
• Schematic.
• Objectives.
• Description/Background
• Attribute.
• See website checklist!

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Next 2 Weeks

• Prototyping on SK-10s
• Return of Proposals
• Complete Schematic (EAGLE)
• Programming/Interfacing Signoff
• Easy if keep underway.

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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.

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Lectures

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

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Schedule

• Do not underestimate times for
• - design
• - parts
• - fixes
• - software
• - integration
• - background
• - creativity

• Easy schedule if regular.
• Dont let due dates loom!

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The Labs

• Office hours are generally in lab.
• Generally in each lab day.
• Approach in lab or after class.
• Arrange time if need be.