Blogs

Embedded applications are hard for a large number of reasons, but one of the main issues is memory.  Today I want to talk about how our C variables get initialized and a few assumptions we make as we use C to write embedded software. Let us take a few simple declarations such as we might make every day. char *string1 = "string1"; const char *string2 = "string2"; char const *string3 = "string3"; char * const string4 = "string4"; char const * const string5 = "string5";   In C99 th

Structures in the C Programming Language Structures in C is one of the most misunderstood concepts. We see a lot of questions about the use of structs, often simply about the syntax and portability. I want to explore both of these and look at some best practice use of structures in this post as well as some lesser known facts. Covering it all will be pretty long so I will start off with the basics, the syntax and some examples, then I will move on to some more advanced stuff. If you are an

Exactly how long is a nanosecond? This Lore blog is all about standing on the shoulders of giants. Back in February 1944 IBM shipped the Harvard Mark 1 to Harvard University. It looked like this: The Mark I was a remarkable machine at the time, it could perform addition in 1 cycle (which took roughly 0.3 seconds) and multiplication in 20 cycles or 6 seconds. Calculating sin(x)  would run up to 60 seconds (1 minute). The team that ran this Electromechanical computer had o

If you are going to be writing any code you can probably use all the help you can get, and in that line you better be aware of the "Ballmer Peak". Legend has it that drinking alcohol impairs your ability to write code, BUT there is a curious peak somewhere in the vicinity of a 0.14 BAC where programmers attain almost super-human programming skill. The XKCD below tries to explain the finer nuances. But seriously many studies have shown that there is some truth to this in the sense that

Epigrams on Programming Alan J. Perlis Yale University This text has been published in SIGPLAN Notices Vol. 17, No. 9, September 1982, pages 7 - 13.  The phenomena surrounding computers are diverse and yield a surprisingly rich base for launching metaphors at individual and group activities. Conversely, classical human endeavors provide an inexhaustible source of metaphor for those of us who are in labor within computation. Such relationships between society and device are no