Let's Program the Transistors
Whenever you want to add something to the kernel code, there are two options – either add your code to the kernel code and compile/build the entire kernel image or compile your code separately and add it to the kernel image later. The first one is the earlier approach that was followed. But, considering the…
To interact with the hardware, driver needs to communicate with the kernel and before that, it must notify the kernel about its presence. This is achieved by the “init” call by which the driver is registered with the kernel and allocated the memory it wants. At the time of system shut down, the driver is…
As briefly discussed in our previous article, device driver is a software that is used to control a hardware device and make it work. It acts as an interface between the user-application and the hardware. Any user-application reaches out to the device driver for any interaction with the hardware device and the device driver checks…
Device driver is a computer program that controls a particular device that is connected to the system be it printers, CD-ROM readers etc. Before we go into device drivers, let us get a brief of the Linux architecture. The Linux virtual memory is divided into two partitions namely user space and kernel space to protect…
L&T Emsys Interview Question Bank continued from Part 2… Q : Why is multiplexing used? A : Resources are limited and number of people using mobile phone and internet services are increasing day by day, so to provide efficient access to all users, multiplexing is used as it allows to share expensive resources among all. Q :…
Let us now look at the questions asked in the recent times of interviews of L&T Emsys, a division of L&T Technology Services that deals with embedded systems and software development (and thus, the name L&T Emsys). It is an ECE core company which was incorporated in February 2001 and has three development centres in Mysore,…
Microcontroller is termed as “Computer-on-a-Chip“. It is named so, because not only the CPU, but RAM, ROM, I/O ports, Timer/Counter, Serial I/Os all are put together on a single microcontroller chip. Microcontrollers are task specific and are essentially used for making Embedded Systems. The above image shows very few examples for the application of microcontrollers…