Read e-book online Networking and Internetworking with Microcontrollers PDF

By Fred Eady

ISBN-10: 0750676981

ISBN-13: 9780750676984

Subtle networking and communications services that have been formerly the only area of mainframes, desktops, and workstations are actually changing into obligatory within the realm of smaller embedded microcontrollers. in spite of the fact that, documentation, criteria, and layout details is scattered between many assets and is hard to discover.

In this functional booklet, renowned columnist and embedded clothier Fred Eady is your consultant and consultant. He pulls jointly the entire helpful layout heritage and information and indicates you the way to take advantage of today's cheap microcontrollers for robust communications and networking purposes akin to neighborhood zone networks and embedded web. utilizing operating code examples and schematics, Eady steers you thru the fundamentals utilizing well known microcontroller households, PIC and Atmel.

Included are a wealth of targeted layout examples for:
· RS-232 firmware and hardware
· Microcontroller USARTs
· The I2C bus
· Ethernet implementation
· Embedded net implementation
· instant links

Sample resource code is equipped and carefully defined for all of the program examples. The accompanying CD-ROM includes the instance code in addition to a searchable book model of the textual content, that can assist you wake up to hurry quick. you'll spend days or weeks pulling jointly all of the info that Eady has assembled during this one crucial reference.

* the single resource that draws jointly difficult-to-find layout info, and teaches step by step how one can use it to create strong networking applications
* contains absolutely practical examples of microcontroller and firmware
* significant other cd-rom contains all schematics and code used in the e-book

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Additional info for Networking and Internetworking with Microcontrollers

Example text

The receiving application will most likely throw this RS-232 data packet (and any similar to this that follow) in the trash. PicBasic Pro’s bit inversion option is used to avoid situations like the one we just discussed that stem from not having an RS-232 converter IC at one end of the link. As you can see, the bit inversion takes the place of an RS232 converter IC and allows direct connection to a “true” serial port. Although you can hook raw microcontroller port I/O pins directly to an RS-232 port, be careful as the RS-232 voltages will damage your microcontroller.

Equating a ‘1’ to a bit allows the program represented by that bit to be compiled. Conversely, a ‘0’ assigned to a bit effectively turns that program off to the compiler. Normally, this kind of code would not be something you’d want to include in a professional project. I’m incorporating it here to make the PicBasic Pro Compiler serial communications example easier for you to understand and compile by stuffing two programs into one as we did with the Custom Computer Services C Compiler C source.

The same is true for the transmit circuit, which is driven using Q2, R4 and R5. If the RS-232 cable is not too long and is of a high quality, Q2 will send a “dirty” mark (0 VDC instead of –3 VDC or better) when it is turned on by the PIC12F675’s transmit pin, GP2. A clean space will be transmitted when Q2 is off. 2 is a cheap and easy way to implement an RS-232 link. Writing Some Simple RS-232 Firmware No matter which direction you took, “dirty” PICkit 1 or homebrew “formal,” I’m sure you’ll agree that the RS-232 hardware was easy to obtain and assemble.

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Networking and Internetworking with Microcontrollers by Fred Eady

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