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Embedded Systems Glossary: A | Netrino. A/D converter (ay to dee converter) n. A hardware device that reads an analog signal—typically a voltage—compares it to a reference signal, and converts the resulting percentage to a digital value. Short for analog-to-digital converter. Abbreviated ADC. The reference signal represents 100%. An n-bit A/D converter has a maximum value of 2n - 1 and a resolution of Vref/2n. [more] See also D/A converter.
(like Cain's brother) abbr. Active low adj. Address bus n. Aliasing 1. n. 2. n. 3. n. Analog adj. Anode n. Aperiodic adj. EXAMPLE: The arrival of interrupts is often aperiodic. See also sporadic. aperiodic server n. N. Application-specific integrated circuit n. Ariane 5 n. In the case of Ariane 5, some code borrowed form the successful Ariane 4 design experienced an overflow during flight. See also Therac-25. (like your arm) abbr. HISTORY: The ARM design was started in 1983 as a project at Acorn Computer Group. DEC later licensed the design and produced the StrongARM. ARM Thumb n. See also RARP. assembler. NSLU2 - YobiWiki. Intro XScale processor from Intel (ARM) at 266MHz (133MHz before hacking...) 32Mb SDRAM 8Mb Flash 2 USB 2.0 ports Links Todo Mine came with Server Name: LKG63472F Version: V2.3RA5 Connect USB printer?
Debian Installation To install, follow the howto, here are the big steps: After first reboot dpkg --get-selections|wc -l du -hs / dmesg: Linux version 2.6.18-4-ixp4xx (Debian 2.6.18.dfsg.1-12) (waldi@debian.org) (gcc versi on 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #1 Tue Mar 27 18:01:56 BST 2007 CPU: XScale-IXP42x Family [690541f1] revision 1 (ARMv5TE), cr=0000397f Machine: Linksys NSLU2 Memory policy: ECC disabled, Data cache writeback On node 0 totalpages: 8192 DMA zone: 8192 pages, LIFO batch:1 CPU0: D VIVT undefined 5 cache CPU0: I cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets CPU0: D cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets Built 1 zonelists.
Hdparm -tT /dev/sda Tweaks Much better :-) Devel Basics. Guidelines for Proper Wiring of an RS-485 (TIA/EIA-485-A) Network. Abstract: The proper method of wiring an RS-485 network is described, with recommendations for twisted-pair cabling and correctly locating termination resistors. Received waveforms are shown for examples of proper and improper cable termination. Configurations are shown for a simple, single-transmitter/multiple receiver network through multiple transceiver to multibranched circuits. This application note provides basic guidelines for wiring an RS-485 network. The RS-485 specification (officially called TIA/EIA-485-A) does not specifically explain out how an RS-485 network should be wired.
The specification does, nonetheless, give some guidelines. These guidelines and sound engineering practices are the basis of this note. RS-485 transmits digital information between multiple locations. Wire RS-485 is designed to be a balanced system. Figure 1. The system is called balanced, because the signal on one wire is ideally the exact opposite of the signal on the second wire. Figure 2. Figure 3. Triple Axis Accelerometer Breakout - ADXL335. Tutorial - Experiment 2 - Expanding Switch Input Detection. Translate this page Controlling The Real World With Computers ::. Control And Embedded Systems .:: Experiment 2 - Expanding Switch Input Detection Previous: Experiment 1 - Basic Switch Input Detection Next: Experiment 3 - The General Purpose Digital Input/Output Module - Part 1 This experiment will use the 8255 Programmable Peripheral Interface (PPI -- see the data sheet: 8255.PDF).
Here, Port A's bits will be called PA0, PA1, PA2, PA3, PA4, PA5, PA6 and PA7. The 8255 can be programmed in mode 0, 1 or 2. In mode 0, Ports A and B operate as inputs or outputs, and Port C is divided into two 4-bit groups, either of which can be operated as inputs or outputs. Mode 1 is the same as Mode 0, but Port C is used for hardware handshaking. In mode 2, Port A is bidirectional (both input and output) and Port C is used for hardware handshaking Port B is not used. The various modes can be set by writing a special value to the control register. This experiment will use mode 0. To outline the procedure: 1. 2. The Ganssle Group. Embedded Software Multimedia. Embedded Systems/Embedded System Basics. Embedded systems programming is not like normal PC programming. In many ways, programming for an embedded system is like programming a PC 15 years ago. The hardware for the system is usually chosen to make the device as cheap as possible.
Spending an extra dollar a unit in order to make things easier to program can cost millions. Hiring a programmer for an extra month is cheap in comparison. This means the programmer must make do with slow processors and low memory, while at the same time battling a need for efficiency not seen in most PC applications. Tools[edit] Embedded development makes up a small fraction of total programming. Debugging tools are another issue. Resources[edit] To save costs, embedded systems frequently have the cheapest processors that can do the job. Memory is also an issue. Other resources programmers expect may not even exist. Real Time Issues[edit] Embedded systems frequently control hardware, and must be able to respond to them in real time.
Low Power System Design Considerations. Temperature sensor for WRT54G 2.x and WRT54GS with DS1820. Introduction This is a tutorial for attaching Dallas DS1820, DS18B20, DS18S20, 1-wire thermometer to Linksys WRT54G/S. The motivation was due to frustration of adapter stacking found on internet. Even some authoritative open source such as OWFS suggest DS2480B line driver, 3.3V -> 5V MAX883 level shifter, voltage regulator and so on.
It can be shown that for simple temperature measurement with WRT54G only sensor and transistor with three resistors is sufficient for the job. No PCB, just soldering on SIL socket. With testing it was found out that DS1820 cannot work with parasite power on 3.3V. WRT54G/S serial interface For opening the case and how to void warranty please see Linksys WRT54G/WRT54GS Dual Serial Port Mod. The pin-out of JP1 on the Linksys PCB is as follows: Pin 1: 3.3V Pin 2: 3.3V Pin 3: Tx (ttyS1) Pin 4: Tx (ttyS0) Pin 5: Rx (ttyS1) Pin 6: Rx (ttyS0) Pin 7: NC Pin 8: NC Pin 9: GND Pin 10: GND We will concentrate on second port ttsS1 as first is reserved for serial console. . The Science Channel :: TV Listings :: How It's Made. All times et/pt Tuesday April 15 How Do They Do It?
(Season 10) Bells, Hurricane Clean Up, Dates On this episode of How Do They Do It: Bells, Hurricane Clean Up, Dates. Paris Sewers, Beretta, Cotton Apparel On this episode of How Do They Do It: Paris Sewers, Beretta, Cotton Apparel. Plane Painting, Clogs, Pasties On this episode of How Do They Do It: Plane Painting, Clogs, Pasties. Strip the City 2 Machu Picchu Machu Picchu, the crown jewel of the sprawling Incan empire, is constant threatened by earthquakes, landslides, and torrential rain. New Orleans Sitting on a hurricane highway, and surrounded on every side by water, New Orleans is directly exposed. Paris Paris was built on top of ancient limestone quarries and the city’s modernization has taken its toll; the streets are collapsing.
Close Encounters School’s Out and Christmas Lights SCHOOL’S OUT: APRIL 6, 1966 – It’s 11am at a school in Australia when a classroom of students playing outside see a saucer-shaped object in a field. Episode 1 Africa. Doing real-time UML systems design using the Harmony Process: Part 2.