Understanding Architecture

Tutorial

• A tour of the Arduino internals
• Three simple button-LED c-programs
• CrossPAck for AVR
• Programming an ATtiny with Arduino
• Arduino board as ATtiny programmer

Arduino

• What is Arduino?

• IDE workflow:

  1. First, select the appropriate board and timing source. If you followed the steps in Software Setup above, you should be able to pick "ATtiny44 (internal 1 MHz clock)" from board submenu under the Tools menu. Although you have likely put a 20 Mhz crystal on your board, start with 1 MHz to ensure it is working properly.
  2. Then, select the appropriate programmer. If you are using an off-the-shelf AVR MkII, pick "AVRISP MkII" under the programmer submenu under the Tools menu. If you are using the FabISP you build earlier in the semester, pick "USBtinyISP."
  3. Then, select "Burn bootloader" to set the fuses and get timing right. Even if you have a crystal, again, I suggest starting with an internal clock, just to be safe.
  4. Finally, select "Upload using programmer" to upload your program.

C

• I first followed this tutorial and used Neil's example hello.ftdi.44.echo.c file & hello.ftdi.44.echo.c.make

  To compile the program use this in your terminal (make sure you cd the right directory )
  $ sudo make -f hello.ftdi.44.echo.c.make

  To make the the chip using the external clock so the programmer can talk to it use.
  $ sudo make -f hello.ftdi.44.echo.c.make program-usbtiny-fuses

  To upload the program use this in your terminal
  $ sudo make -f hello.ftdi.44.echo.c.make program-usbtiny

  To receive a response (make sure you find the right USB port you are using to receive the response
  $ python term.py /dev/ttyUSB0 115200 (mac: /dev/tty.usbserial-*********

  you must be in the directory to run this command.
  I programed my echo-world board on Ubuntu, using ACRISP mkII at the archshop

• Pyserial is a python-based module that allows you to access the serial port.
• Cross Pack is essentially a software that download/upload/manipulate the ROM and EEPROM contents of AVR microcontrollers using the in-system programming technique (ISP).

Terminology

• PWM
• Digital vs. Analog Working with microcontrollers, or really any logic-based electronics, means working in the digital realm most of the time. If you want to sense light, temperature, or interface a microcontroller with a variety of other analog sensors, you’ll need to know how to convert the analog voltage they produce into a digital value.
Pull up resistor Picking resistor for LEDS Fuse ATtiny44 Digital Logic Transistor analogWrite()
• Tutorials for: C, Arduino, workflow , another C

Reading ATtiny44

• It is impossible.

• There is a power pin VCC and a ground pin GND, there is also an SCKpin - serial clock pulses which synchronize data transmission generated by the master, a Serial Out pin MISO - Master In Serial Out that sends data to the master,, a Serial In pin MOSI - Master Out Serial In that sends data to the peripherals, a RESET pin, and 8 I/O pins (max out to 12).
  When the RESET pin is at a postive voltage (the same voltage as VCC) the chip runs the program, when the /RESET pin is at ground (the same voltage as GND) then the chip stops and listens for programming instructions on the programming pins.

  registers are used in the interface between software and peripherals. Software writes them to send information to the device, and reads them to get information from the device