http://dev.frozeneskimo.com/ 2010-09-05T17:44:06-05:00 http://dev.frozeneskimo.com/ http://dev.frozeneskimo.com/lib/images/favicon.ico text/html 2010-04-01T16:00:55-05:00 http://dev.frozeneskimo.com/embedded_projects/audio_echo_effect?rev=1270155655&do=diff * Posted on 03/28/2010 * Updated schematics on 04/01/2010 Video Here is a video of my friend James playing his electric guitar, patched through the audio echo effect system, and then to his amp. I didn't make any effort to prove that this isn't a conspiracy, so you'll have to take my word that the echo effect is actually happening on the breadboard and not some hidden pedal or options on his amp. While I'm at it, I apologize for the camera phone video quality. text/html 2010-02-22T17:43:51-05:00 http://dev.frozeneskimo.com/embedded_projects/embedded_secure_network_bridge?rev=1266882231&do=diff ESNB's full report will be posted soon. Email me at vsergeev at gmail if you would like a PDF copy before then. text/html 2010-04-03T07:40:55-05:00 http://dev.frozeneskimo.com/embedded_projects/home?rev=1270298455&do=diff Hardware Projects * Audio Echo Effect MCU Notes, Drivers, and Projects * Compiling your own CMSIS Code for the mbed * LPC21xx Notes * Directory for some of the items below: <http://dev.frozeneskimo.com/code/notes/> SD Card (SPI) Driver (NXP LPC2109) - 2009 With some of the nuances of communicating with an SD card over SPI, it can be tricky to get the card to the respond at first. text/html 2010-02-22T16:29:54-05:00 http://dev.frozeneskimo.com/embedded_projects/juicebox_homebrew?rev=1266877794&do=diff 2006/01/19 - More JuiceBox Dev The JuiceBox is a great dev board to learn on. Everything is production prewired, all you have to do is write the code to work it… Today I have made some significant progress with the general understanding of this embedded hardware. Using just JTAG/OCDCommander, the datasheet, and the register definitions in s3c44b0x.h, I have gotten two different parts of the board to work. First, the buttons. This was pretty easy, since I have worked with the idea of setting th… text/html 2007-12-14T16:45:23-05:00 http://dev.frozeneskimo.com/embedded_projects/lc7981_hd61830_lcd_driver?rev=1197672323&do=diff I’ve found the time to post this LC7981/HD61830 driver (only graphics mode implemented) and some images of this Samsung LCD I’m using. I bought the LCD off of ebay (<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=230070938443>) and shortly after I wrote the driver for it from scratch. I finished this driver about a month and a half ago, but I have just been too busy lately to post anything about it till now. text/html 2010-02-25T00:06:56-05:00 http://dev.frozeneskimo.com/embedded_projects/parallel_sram?rev=1267078016&do=diff Introduction - 12/03/2007 The Cypress CY62256 is a typical parallel-interface SRAM chip. It has a 512×512 array, yielding 262144 bits. Organized in 8-bit words, the capacity is 32768 bytes. Most 8-bit microcontrollers with sufficient I/O are suitable for interfacing with a parallel SRAM chip. I chose an AVR ATMega32. text/html 2010-02-22T16:31:06-05:00 http://dev.frozeneskimo.com/embedded_projects/pop3_email_checker?rev=1266877866&do=diff Introduction - 08/01/2006 The other night I came across a 7-segment LED display and decided to interface it to a parallel port. I added a button as well. The 7-segment LED lines (each leg of the display plus the dot LEDs) are connected to the parallel port data pins (D0-D7). I have the button hooked up to nInitialize (bidirectional) and nAck (input only). I've never done a parallel port interface project before, so I figured this would be a good start.