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Matthew Murach

Overview of Project 4 Slides are available at : http://www.pages.drexel.edu/~mjm46 Due Tuesday 17 th. Matthew Murach. Project 4: Tx/Rx Communication. For this project, you are designing a two way, full duplex, communication system.

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Matthew Murach

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  1. Overview of Project 4Slides are available at : http://www.pages.drexel.edu/~mjm46Due Tuesday 17th Matthew Murach

  2. Project 4: Tx/Rx Communication • For this project, you are designing a two way, full duplex, communication system. • That is to say that a loop back can be established between the input and output ports. • If your project is functioning, you should be able to transmit values from your digital output pins to another handyboard’s digital input pins.

  3. Project 4: Tx/Rx • For this project your code should be organized roughly as follows: void receive (){} /* receive data */ void send(){} /* send data */ void main(){} /* delegate communication */ • For this project, the multitasking arrangement is required. In other words any given handyboard is required to be able to send or receive to another handyboard.

  4. Project 4: Tx/Rx • Basic output pins: SPI connector can be configured in this fashion. Also digital 9 can be setup in this fashion. • Use the poke command to set SPI poke(0x1009,0x3C); /*sets SPI pins to output*/ See page 59 in Handyboard manual • More coverage on the SPI will be given on the first class next week.

  5. Project 4: Tx/Rx • Digital 9 is much easier to setup in this fashion • Using the functions bit_set(), bit_clear you can control digital 9. /* sample digital 9 control */ bit_set(0x1026,0x80) /* set digital 9 as output */ bit_set(0x1000,0x80) /* drive 9 to logic 1 */ bit_clear(0x1000,0x80) /* drive 9 to logic 0 */ bit_clear(0x1026,0x80) /* set digital 9 back to input */ • You may chose to use binary communication with just digital 9 and 7.

  6. Project 4: Tx/Rx • It is also possible to use IR communication through the handyboard. • However, this method is NOT advised since it is impossible to setup a loopback with just one handyboard. • You should use the method of digital communication described earlier.

  7. Project 4: Tx/Rx • Your communications system should send a user predefined array to the output. • To test your code only one handyboard should be needed. Simply cross-connect the output pins with the input pins. The receive function should poll the input pins and the send function should send a predefined message through the digital outputs • Note that both send and receive must be active and hence “concurrent operations”

  8. Project 4: Tx/Rx • This project will require the following. • Each design team consisting of 1-2 students should submit a brief 1-2 page report detailing the design and implementation that was chosen. • In addition, all C files needed for this project should be well commented and readable. • Also each team will be required to show that the design works by illustrating dashes and dots across the receiver.

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