Search found 44 matches

by Administrator
17-Mar-2015, 21:54
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [AVR] How to connect and drive 7 Segment LED with Arduino
Replies: 0
Views: 29371

[AVR] How to connect and drive 7 Segment LED with Arduino

Hello. A seven-segment display is a device for displaying decimal numerals. Such LED-displays are widely used in digital clocks and other electronic devices for displaying numerical information. The 7-segment display is a simple device. It is actually composed of seven elements and a dot (8 LEDs, Li...
by Administrator
11-Nov-2014, 22:43
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [STM] Tutorial: Getting started with STM32F3 Discovery board
Replies: 2
Views: 25152

Re: [STM] Tutorial: Getting started with STM32F3 Discovery b

Lesson #3. This lesson shows how to use System Timers to control the LED of an STM32 microcontroller. System Timer is implemented as an interrupt handler. SysTick_Handler is called every N-ticks on an STM32 Discovery Board. Cortex-M3 (M4) has a wide variaty of timers that generates different events....
by Administrator
11-Nov-2014, 21:17
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [STM] Tutorial: Getting started with STM32F3 Discovery board
Replies: 2
Views: 25152

Re: [STM] Tutorial: Getting started with STM32F3 Discovery b

Lesson #2. In this tutorial we will devolop firmware for a STM32F303 board. This program polls the state of the user pusshbutton. When the button is pressed all LEDs are switched on. In the other case the LEDs are turned off. User pushbutton is connected to Pin_0 on Port_A. There is a push-pull resi...
by Administrator
11-Nov-2014, 19:55
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [STM] Tutorial: Getting started with STM32F3 Discovery board
Replies: 2
Views: 25152

[STM] Tutorial: Getting started with STM32F3 Discovery board

Lesson #1. This guide briefly describes how to get started programming SMT32F3 board using IAR Embedded Workbench. First tutorial shows how to create a simple blinking LEDs firmware for this board. #include <stm32f30x.h> #include <stm32f30x_rcc.h> #include <stm32f30x_gpio.h> int main() {     GPIO_In...
by Administrator
06-Oct-2014, 19:45
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [STM] Getting started with IAR for ARM. IDE quick setup.
Replies: 1
Views: 21861

[STM] Getting started with IAR for ARM. IDE quick setup.

Hello. First of all you should download installation package for: "IAR Embedded Workbench for ARM" at http://www.iar.com/Service-Center/Downloads/ (size-limited evaluation license) When the installation is complete you need to register online (you can use any name and country, but you need valid e-m...
by Administrator
07-Aug-2014, 13:06
Forum: Unix, Linux, Mac OS, DOS
Topic: [RPI] How to update the kernel and the firmware?
Replies: 0
Views: 43600

[RPI] How to update the kernel and the firmware?

We need internet connection and terminal window (or PuTTY). Use Win32DiskImager to make backup-file of your SD card. If your Raspberry PI uses small SD-card ( < 4GB) you can get the "out of free space" error. Try to delete temporary files and unused downloaded package files (.deb files) in "/var/cac...
by Administrator
17-Apr-2014, 22:10
Forum: Windows, .Net, OpenGL
Topic: [IE] Loading HTML content from any source
Replies: 0
Views: 43951

[IE] Loading HTML content from any source

Introduction Some time ago I faced with the task to dynamically load HTML-page and parse its content. I thought this "trivial problem" will take couple of hours. In fact it took a week to solve. Some solutions I have found are ugly or buggy, wrong or incomplete, some of which are from Microsoft tec...
by Administrator
17-Apr-2014, 19:00
Forum: Windows, .Net, OpenGL
Topic: [IE] Rendering an IHTMLElement to an Image File
Replies: 0
Views: 25384

[IE] Rendering an IHTMLElement to an Image File

Rendering an IHTMLElement to an Image File What This Article Is About This code can take a snapshot of a webpage and store it as an image for viewing later. I would like to extract a bitmap from an html page. I expected to find a IStream, IPersistStream or IPersistStreamInit from the IHTMLImgElemen...
by Administrator
14-Apr-2014, 20:29
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [SD] How to Use MMC/SDC
Replies: 3
Views: 24991

Re: [SD] How to Use MMC/SDC

Consideration to Bus Floating and Hot Insertion Any signals that can be floated should be pulled low or high properly via a resister. This is a generic design rule on MOS devices. Because DI and DO are normally high, they should be pulled-up. According to SDC/MMC specs, from 50k to 100k ohms is rec...
by Administrator
14-Apr-2014, 19:19
Forum: Hardware, DIY (Do-It-Yourself)
Topic: [SD] How to Use MMC/SDC
Replies: 3
Views: 24991

Re: [SD] How to Use MMC/SDC

Data Transfer Data Packet and Data Response In a transaction with data transfer, one or more data blocks will be sent/received after command response. The data block is transferred as a data packet that consist of Token, Data Block and CRC. The format of the data packet is showin in right image and...