Month: March 2011

Do we need ARM?

ARM microcontrollers are very successfully positioned microcontrollers in the market. Billions of them are used in all areas where control, data processing, in interfacing is needed. ARM microcontrollers have evolved into a high-level product that provides high processing power with the minimum clock frequency and power usage. Practically all major manufacturers are developing their line or ARM processors that share the same standard core functionality, and variations between MCUs starts with peripherals and other external features. ARM microcontrollers are cheap and robust which makes them attractive to use in almost all applications. They are successfully taking the place of smaller microcontrollers like ARM or PIC. Hobbyists also are taking them over.

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Using Standard IO streams in AVR GCC

In the previous tutorial, we learned how to transmit data over USART. By using simple functions, we can send or read bytes/arrays. We learned how to do this very efficiently with interrupts and buffers. But when things become more involved and our data messages have to be somehow formatted, our send and receive functions would begin to grow tremendously. Don’t waste your time figuring all out. AvrLibc has an excellent standard library stdio.h, which is specially designed to deal with formatted data streams. This library offers superior functionality but also takes a significant amount of code space and program speed. So before use, it makes sure your program isn’t time critical or won’t take more code space then AVR can hold.

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