Wireless Oom » sensor

What is SPI?

wirelessoom — Wed, 13 Jan 2010 19:01:52 +0000

The Serial Peripheral Interface Bus or SPI bus is a synchronous serial data link standard named by Motorola that operates in full duplex mode. Devices communicate in master/slave mode where the master device initiates the data frame. Multiple slave devices are allowed with individual slave select (chip select) lines. Sometimes SPI is called a “four wire” serial bus, contrasting with three, two, and one wire serial buses.

What is I2C-Bus?

wirelessoom — Wed, 13 Jan 2010 18:53:29 +0000

The I2C bus was designed by Philips in the early ’80s to allow easy communication between components which reside on the same circuit board. Philips Semiconductors migrated to NXP in 2006.

The name I2C translates into “Inter IC”. Sometimes the bus is called IIC or I²C bus.

The original communication speed was defined with a maximum of 100 kbit per second and many applications don’t require faster transmissions. For those that do there is a 400 kbit fastmode and – since 1998 – a high speed 3.4 Mbit option available. Recently, fast mode plus a transfer rate between this has been specified.

I2C is not only used on single boards, but also to connect components which are linked via cable. Simplicity and flexibility are key characteristics that make this bus attractive to many applications.

Most significant features include:

* Only two bus lines are required
* No strict baud rate requirements like for instance with RS232, the master generates a bus clock
* Simple master/slave relationships exist between all components
Each device connected to the bus is software-addressable by a unique address
* I2C is a true multi-master bus providing arbitration and collision detection

What is PC-lint?

wirelessoom — Wed, 06 Jan 2010 23:44:30 +0000

PC-lint is a command-line tool for developers, indicating suspicious or plain wrong issues in source code.

PC-lint is a commercial static code analysis software tool produced by Gimpel Software for the C/C++ languages.