Description

This repository holds everyting you need to complete 18-549 Lab2.

Software Dependencies

• avr-libc (version 1.8 works), binutils-avr, gcc-avr On Debian or Ubuntu
• avrdude version 6.2 or later
• minicom

On more recent verison of Debian and Ubuntu you should be able to do the following:

sudo apt-get update
sudo apt-get install avr-libc avrdude minicom

Programming

This lab requires you to flash the bootloader and then a UART test program, using the bootloader.

To flash the bootloader you need an Atmel ICE In System Programmer(ISP) and avrdude. Once you have the bootloader flashed, you can load the UART test program using avrdude and a basic USB to serial cable(FTDI cable).

We support two different Atmega328P designs, the 8MHz(for 3.3V) and the 16MHz(for 5V). On this MCU, hardware peripheral(like uart) configuration and core system libraries are dependent on the clock rate. For this reason, you must ensure that the software being compiled for your MCU is aware of the chosen clock rate. This is typically set at compile time using the F_CPU macro. The instructions below show how you set the clock rate for the build system.

Here are the specific commands for each clock rate:

• 16MHz clock [default design]
  In the arduino_bootloader directory run the following command:

  make atmega328_isp
  

  In the uart_test directory run the following commands:

  make
  make program
  

• 8MHz clock
  In the arduino_bootloader directory run the following command:

  make atmega328_pro8_isp
  

  In the uart_test directory run the following commands:

  make AVR_FREQ=8000000L
  make program
  

Testing

Open minicom on /dev/ttyUSB0. Ensure that you see "Hello World" first, then you see an echo of all keys that your type.

Extra Notes

The Debian install command should be sufficient, since avr-libc depends on all of the other AVR tools. A changelog entry mentioned that AtmelICE support was added in version 6.2. Testing shows it working on avrdude version 6.3.

The atmelice_isp programmer's entry in /etc/avrdude.conf should look like the following:

programmer
  id    = "atmelice_isp";
  desc  = "Atmel-ICE (ARM/AVR) in ISP mode";
  type  = "jtagice3_isp";
  connection_type = usb;
  usbpid = 0x2141;
;