tag:blogger.com,1999:blog-16496546389534085862024-09-24T18:22:06.705-07:00Learning CDestination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-1649654638953408586.post-34188438410362542152010-07-31T14:56:00.000-07:002010-07-31T14:56:22.167-07:00Data Alignment Question Interview - PowerPCWhat happens when you try to read an integer value from memory address 0x000003?
assume: ANSI C standards
Things to look for:
Does the candidate know
1. what is the size of integer in PowerPC EABI ANSI C
4 bytes
2. what happens when a read from a non aligned address and how to handle it
&Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-30983511714668077412010-01-14T10:36:00.001-08:002010-01-14T10:36:42.097-08:00Elf file detailsgood overview of elf files
http://docs.sun.com/app/docs/doc/802-1948/6i5uqa9pl?a=viewDestination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-91889689331635585682010-01-14T10:28:00.000-08:002010-01-14T10:28:48.340-08:00Example codesA good site for all example codes
c c++ java assembly php VB .net
http://www.happycodings.com/Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-32873618129684985582009-12-30T10:11:00.000-08:002009-12-30T10:13:48.377-08:00Simple function to print hello world without a semi colonThis is a very simple program which is used to print "Hello World" without using a semi circle.void main(){ if(printf("Hello World") { /* Do nothing */ } else { /* Do nothing */ }}Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-17237104836169162932009-12-30T09:34:00.000-08:002009-12-30T10:05:55.298-08:00Complier Allocating the memory in different areasConsider the following lines of code:Question is where will these variables and constant be allocated in the micro controller?static char x; /* Static uninitialized variable */static char y = 10; /* Static initialized variable */const char z = 20; /* Constant data */void f1(void){ char a; /* goes into stack */ a = 1; x = y + z;}Answer:compiler will allocate 'x' to a location in Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com1tag:blogger.com,1999:blog-1649654638953408586.post-80083756278066500582008-12-29T22:00:00.000-08:002009-01-23T05:07:56.225-08:00Software Design & OtherArchitecture for reusable embedded codehttp://www.embedded.com/207402543Reentrancy explained http://www.embedded.com/story/OEG20010311S0005Review & Inspectionhttp://embedded.com/design/testissue/212700467?pgno=1Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com1tag:blogger.com,1999:blog-1649654638953408586.post-74591333327514817222008-12-23T21:33:00.000-08:002009-01-19T23:13:09.381-08:00C Compiler - Optimization BehaviorBelow article gives a good description of compiler optimization and programming techniques: http://www.embedded.com/columns/showArticle.jhtml?articleID=193200027Excellent link on various types of variables & constantshttp://users.ece.utexas.edu/~valvano/embed/chap4/chap4.htmDestination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-91704751952078632662008-09-23T11:21:00.000-07:002008-09-24T08:27:34.767-07:00List of firmware interview questionsC language related1) Function Pointer declaration, use and example2) Pointer to Function?3) Pragma where is it used?4) Linked List5) Structures and Unions6) Sorting Algorithms and programs (merge and bubble sort)7) void * where is it used?Process Related1) SDLC software development life cycle2) PVCSH/W1) Different types of RAM2) Different types of A/D convertersMicrocontroller1) DMA2) ARM?3)Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-46774699423905069002008-09-20T03:03:00.000-07:002010-01-14T10:16:52.043-08:00C program for Factorial of a given number using recursive function#include "stdio.h"
/*
The following code gives factorial of any give integer
*/
unsigned int factorial(int num)
{
if(num == 1 || num == 0)
return 1;
else
num = num * factorial(num - 1);
}
void main()
{
int y = 5;
/*
Check if the user gives a Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com1tag:blogger.com,1999:blog-1649654638953408586.post-80133156354549277642008-09-20T02:02:00.000-07:002010-01-14T10:41:00.996-08:00Difference between Preprocessor, Compiler, Assembler, Linker and InterpreterThe following article gives succinct and brief description of Preprocessors, Compilers, Assemblers, Linkers and Interpreters. While all of these are in some way used to command a processor to do certain set of actions, there is a subtle difference in each of them. This article also, gives links to other related areas.
Preprocessor: All the preprocessor commands written in a high level language Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com13tag:blogger.com,1999:blog-1649654638953408586.post-67649146465666381212008-01-22T09:04:00.000-08:002008-01-22T10:21:55.097-08:002D arrays - Pointer to Array - Array of Pointers - pointer to pointerThis article focuses on 2D arrays and use of pointers to access them.Simple Declaration: int arr[2][3];This way we are declaring a 2X3 array or matrix arr[0][0] arr[0][1] arr[0][2] arr[1][0] arr[1][1] arr[1][2]This type of declaration is useful when we know the size of array.Useful in embedded programming, where, standards guide that fixed arrays have to be used as RAM size is Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com0tag:blogger.com,1999:blog-1649654638953408586.post-50172596011992940142008-01-21T10:23:00.000-08:002008-01-21T11:04:17.519-08:001D arrays basics declaration and memory allocationDeclaring and handling one dimension (1D) arraysint arr[3] = {1,2,3};Assuming int = 2 bytesWhen declared, compiler will allocate 3, 2 bytes of address to variable arrarr = 0x1111 [is a memory location] & sizeof(*arr) = 2 bytes; so total arr = 0x1111 to 0x1112arr + 1 = 0x1113 [is a memory location] & sizeof(*(arr+1)) = 2 bytes; so total arr = 0x1113 to 0x1114arr + 2 = 0x1115 [is Destination - spot!http://www.blogger.com/profile/09725692900949934102noreply@blogger.com1