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August 4, 2011August 7, 2011 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

List of Wireless Standards for Local and Personal Area Networks

While designing your embedded system, you may have to choose between different wireless standards to match your needs. I’ll provide a list a short and mid-range wireless standards, their description and links to open source software stacks (when available) to help you better understand the different options available. Wide Area Network wireless network such as LTE, Wimax, etc.. won’t be discussed in this blog entry. Mesh and IP Networks: Wifi (IEEE 802.11): Wifi is probably the most used wireless standard in consumer electronics devices today as it allows users to connect their device to their LAN wirelessly. An access point has a typical range of about 20 meters indoors and up to 100m outdoors. There are 4 standards 802.11a 802.11b, 802.11g and 802.11n. The latest has a theoretical throughput of 300 Mbps. Check out Wikipedia Wifi page for details. The Wi-Fi stack is part of the Linux kernel but you […]

April 13, 2011September 10, 2021 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

Boot Linux in 300 milliseconds

MakeLinux.com managed to boot Linux from the bootloader to console within 300ms using a customized (and minimal) version of Linux running on Beagleboard based on TI OMAP 3530 (Cortex A8) as per their Super Fast Boot project. Here’s the analysis of the boot sequence and timings: Logging starts at 70 ms from reset. Boot time from reset is 300 + 70 = 370 ms. Logging starts at 330 ms from power on. Cold boot time is 330 + 300 = 630 ms. Loading of 1.5 MiB Linux image from NAND takes 237 ms with throughput 6 MiB/s. Code execution takes 60 ms or 43M CPU cycles. (For other CPU frequency execution time is different, but the number of processor cycles is the same) The most time-consuming operation is coping firmware from NAND flash. They used a Linux 2.6.32 kernel from DVSDK 3.01, in a minimal configuration (900KB footprint), the boot […]

April 6, 2011July 29, 2012 by Jean-Luc Aufranc (CNXSoft) - No Comments

Phytec Texas Instruments OMAP4430 Computer Module

Phytec announced the first system on module based on Texas Instruments OMAP4430. The phyCORE-OMAP4430 features up to 1GB LPDDR2 DRAM, 1GB NAND Flash, one USB Host, one USB OTG port, Ethernet, I2C Interface, DSI and HDMI video output and consumes a maximum of 3 Watts only. Here are the full specifications of the phyCORE-OMAP4430 computer module: Texas Instruments OMAP4430 @ 1GHz PowerVR SGX540 GPU 56 KB On-chip SRAM and 512 MB (default) or 1 GB LPDDR2 DRAM 128, 256, 512 MB (default) or 1 GB NAND Flash 4 (default) or 32 KB EEPROM 2 SD/SDIO/MMC Expansion slot 4 UARTs, 1 RS232, 3 I2C, 1 I2S and 2 SPI/SSP serial connections. 1 USB Host and 1 USB OTG ports. 10/100 MBit Ethernet 2 x DSI, 1 x HDMI video output ports up to 1080p encode/decode and Touch screen support DVI/HDMI, PWM, Camera, Keypad, JTAG and RTC Dimensions: 41 x 51 mm […]

March 25, 2011March 25, 2011 by Jean-Luc Aufranc (CNXSoft) - 7 Comments

Temperature Data Logging with TI eZ430-Chronos Watch

I wanted to record 24-hour of temperature data with eZ430-Chronos devkit and draw the result in a spreadsheet to see how the temperature evolves during the day. Here are the instructions to do so. 1. Update firmware to Chronos Datalogger. In order to record temperature data in your eZ430-Chronos development kit, you’ll need to update the firmware to use Chronos Datalogger. First start the Chronos Control Center, click on the Wireless Update tab, click on browse to select the Chronos Datalogger firmware file matching your hardware. In my case, I selected C:\Program Files\Texas Instruments\eZ430-Chronos\Recovery\Chronos Watch\Applications\eZ430_Chronos_Datalogger_433MHz_1_5.txt. Then click on Update Chronos Watch. On the watch, press the # button several time to enter rFbSl mode and press the down button to start the wireless update. 2. Configure the watch for temperature logging. Now start Chronos Data Logger software, click on Start Access Point. On your watch, press the # button to […]

March 23, 2011April 6, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

Archos Gen9 Tablets Coming in June 2011

During the investor conference on 18th March 2011, Archos announced they will release their Gen9 Android Tablets in June 2011 with 4 key differentiators compared to the competition: Plastic-overmolded stainless steel structure: Thinner, lighter and stronger tablet enclosure Better cost-effectiveness than competing solutions Patented techno used since Gen 7 in 2009 ARCHOS alone to use Hard Disks in tablets: Deep redesign of Android ARCHOS has a long experience in using HD’s for mobile devices Price: 250 GB HD = 32 GB Flash Memory ARCHOS 1st to use ARM Dual Core A9 @ 1.6 GHz Forefront competition limited to ARM Dual Core A9 @ 1GHz (iPad 2, Xoom All Gen 9 tablets targeted at 1.6 GHz All Gen 9 tablets targeted at 1.6 GHz New disruptive 3G modem solution for tablets Will allow ARCHOS to make headway into telcos Implemented in all Gen 9 tablets Patent pending Since Archos Gen8 were […]

March 22, 2011 by Jean-Luc Aufranc (CNXSoft) - 4 Comments

Texas Instruments eZ430-Chronos Wireless Watch Unboxing

I’ve just received the eZ430-Chronos development tool I ordered last week (after 2 working days) by Fedex. Today, I’ll just post some pictures of the kit and provide some descriptions. There is a woman jogging on the box because you can actually buy a chest strap to monitor your speed, heart beat and calories consumption. If you would like to purchase one (49 Euros), it is available at http://www.bm-innovations.com/index.php/shop_products.html. Apparently there are only 868MHz (EU) and 915MHz (USA) versions, and they do not sell the strap for the 433MHz (international) version as I have. The watch is normally turned off the first time you open the box, it’s just turned on on the picture because I used it before taking the pictures. The content of the box includes: eZ430-Chronos wireless watch eZ430 USB programming and debugging interface (Bottom left) CC1111 USB RF access point (Bottom right on top of the […]

March 17, 2011March 17, 2011 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

Texas Instruments MSP430 Devkit Facebook Promotion

Texas Instruments is currently offering 50% discount on selected development kits for its Facebook Fans for purchase on TI eStore until stocks last. The two development kits are sold at 50% discount: EZ430-Chronos-433 – eZ430-Chronos Wireless Watch Development Tool, a highly integrated, wireless development system based for the CC430 in a sports watch. It may be used as a reference platform for watch systems, a personal display for personal area networks, or as a wireless sensor node for remote data collection. The original price is 49 USD, but it can be ordered for 24.50 USD (including shipping) with the promo code: FCB-sfVwiUYe EZ430-F2013 – MSP430 USB Stick Development Tool, a complete development system with detachable target board and USB emulator. Ideal for new users. The original price is 20 USD, but it can be ordered for 10 USD (including shipping) with the promo code: FCB-ZC7Y86yQ I’ve ordered the Wireless Watch […]

March 10, 2011July 29, 2012 by Jean-Luc Aufranc (CNXSoft) - 4 Comments

QSeven Form Factor Embedded Boards by Seco

QSeven is a new standard (QSeven Specifications 1.20) that provides pinout, electromechanical description and implementation guidelines so that the main boards (with the MPU) be easily exchanged. So that you can a larger board with all connectors and a QSeven boards based on Intel icore, Atom or other processors based on ARM that simply fits into that larger board. The QSeven concept is defined as follows: Qseven Concept The Qseven concept is an off-the-shelf, multi vendor, Single-Board-Computer that integrates all the core components of a common PC and is mounted onto an application specific carrier board. Qseven modules have a standardized form factor of 70mm x 70mm and have specified pinouts based on the high speed MXM system connector that has a standardized pinout regardless of the vendor. The Qseven module provides the functional requirements for an embedded application. These functions include, but are not limited to, graphics, sound, mass […]