Project Logs

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• Kickstarter Project for Goldilocks Analogue

  Phillip Stevens • 10/21/2015 at 23:51 • 0 comments

  Finally finished all of the testing and development.

  Aside from a hick-up caused by an incorrect Eagle footprint everything tested as designed.

  Launched a Goldilocks Analogue - Kickstarter Project to encourage others to dive into the audio and analogue world with a Arduino.

  Please, back this project if you can.

• Using Master SPI Mode on ATmega USART

  Phillip Stevens • 05/28/2015 at 01:43 • 0 comments

  The SPI bus on the Arduino platform (including the Goldilocks Analogue) is overloaded with activities. Driving the uSD card requires tying up the bus for many hundreds of milliseconds, and this conflicts with the need to output regular audio samples.

  Moving the DAC to the spare USART1 on the ATmega1284p MCU was the best answer.

  Using Master SPI Mode on an ATmega USART

• Prototype 3 - Adding SPI EEPROM and MSPIM

  Phillip Stevens • 05/28/2015 at 01:40 • 0 comments

  Most of the analogue section was working correctly, but there are some additional features that are needed, such as SPI storage using EEPROM, or SRAM, and modifying the way that the DAC is driven.

  Prototyping - Version 3
  

• Implementing NASA EEFS on AVR

  Phillip Stevens • 05/28/2015 at 01:36 • 0 comments

  It is convenient to have a simple file system for use on the SPI EEPROM or RAM, to allow a number of wave tables, WAV files, or other files to be assembled on a host and then written to the EEPROM as one file.

  The NASA developed EEFS is a good solution for this need, but it was developed with 32 bit machines in mind. The AVR ATmega uses 16 bit pointers, and so there needed to be some changes.

  Implementing NASA EEFS on AVR ATmega
  

• Testing against the OML Audio Codec Shield

  Phillip Stevens • 05/28/2015 at 01:32 • 0 comments

  Testing against the Open Music Labs Audio Codec Shield

• Testing against the TI Analogue Shield

  Phillip Stevens • 05/28/2015 at 01:30 • 0 comments

  Testing against the Stanford TI Analog Shield
  

• Second Prototype

  Phillip Stevens • 05/28/2015 at 01:25 • 0 comments

  Design for Second Prototype

• Initial Testing

  Phillip Stevens • 05/28/2015 at 01:24 • 0 comments

  Prototype 1 - Testing

• Design Document - Part 1

  Phillip Stevens • 05/28/2015 at 01:23 • 0 comments

  Design - Part 1

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