Embedded Linux Tips and Tricks

No Wireless Extension found in iwconfig

If we face issue if "no wireless extension found" for iwconfig, iwpriv, iwlist, etc. command when wifi module is connected to any ARM board with Linux.
The solution for this is, By default, the wireless extensions are disabled, and users need to enable the CONFIG_WIRELESS=y,

CONFIG_WIRELESS_EXT=y CONFIG_NET_RADIO option in the kernel configuration (this is the option which enables the choice of radio interfaces in the network driver list).

Version magic Error while loading kernel modules
We do get this error if the kernel module version doesn't matches with required version on host. You can find this version in a generated file after kernel configuration

cat include/generated/utsrelease.h
#define UTS_RELEASE "2.6.35.9-ARCH"

This Macro gives the module version which we can edit to match to the required version of host kernel. Just edit this line then the version magic error will be avoided. Then just run "make modules" to get modules with correct version magic number.

Comments

128 x 64 Graphics LCD Display Interfacing with ATMEGA32 Library from Scratch

Yes I am diving little into traditional stuff, still its interesting to try something from scratch. While working on some hi-tech stuff where we mostly don't care about writing something from scratch as its time consuming. Now a days platforms like arduino are concentrating on Application, they are not meant to use to understand the hardware peripheral. In fact I never tried it though ;). I know there are lots of example available online regarding this graphics LCD. This LCD I selected is HDG128x64F, which is more or less what is conventionally used, but I found some differences as in column addressing method. I got datasheet about HDG128x64F here , where I can only find some commands which are more or less similar to that of 16x2 LCD except RAM addressing method. To start working on this I preferred using Proteus Simulation software to make it more flexible in terms of Hardware. Note - This software I tried with Proteus not on actual h...

Interfacing M45PE16 SPI Flash to ATMEGA32

As many people need some sort of storage in their embedded project, they prefer to use SPI flash. Hence I decided to try this interfacing with ATMEGA32 microcontroller. This SPI flash is 16Mb flash, works on SPI interface. You can reuse below code if you want to integrate this flash to your project. I tested this code using proteus simulation, you can also test and comment. Features of M45PE16- 16Mb of page-erasable Flash memory Page size: 256 bytes Sector erase: 512Kb 75 MHz clock frequency (MAX) In current interfacing I only did Page Write/ Read API's. The SPI needs to configure in Mode 0, and Master at Microcontroller side as given in code below. The result or Page read bytes are displayed over terminal using UART. Code- M45PE16.c /* * * * Created on: Apr 18, 2014 * Author: Shrenik Shikhare * File: M45PE16.c * Discription: Interfaci...

How to interface USB modem to ARM board (for android or linux)

How to interface 3G usb modem to any ARM (Android / linux ported) Board. Hi I am now going to provide quick steps to interface the 3G usb modem to linux/ Android SBC which i have tried during my try which is successful one . More and more USB devices when plugged in for the first time they act like a flash storage and start installing the driver from there. After installation (and on every consecutive plugging) the driver switches the mode internally, the storage device vanishes (in most cases), and a new device (like an USB modem) shows up. Few modems (Huawie) most of time they do not need to switch from mass storage to usb modem mode. When you connect that modem to USB port then it will be detected as ttyUSB (3 ttyUSB ports are detected). Otherwise you need to switch the mode of usb modem by using usb_modeswitch utility (I am giving examples of idea modem / reliance modem which are from Huawei and a dlink 3G modem which requires usb modesw...

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