UART Cross Connect Interrupt 1

Overview

The purpose of the project is to transfer the "Hello World" string from UART 1 to UART 4 and to transfer the "I hear you" string in the opposite direction. Your code must confirm that the received strings match the transmitted strings.

This project uses the same cross connect as the cross connect polling project. The sample code is in myCourses in the Content area in Zhu_text_537-539.pdf. Also, refer to the UART slides.

Setup

Make a copy of your UART cross connect polling code and then start implementing the interrupt logic.

Requirements and Tips

Refer to the Overview. Note that you are not required to submit anything. However, you will need this for the next phase of the cross-connect project. Use today's work session time to implement this or at least get a good start.

I recommend using a buffer size of 81 characters (80 plus one for end of string)
You have a choice for starting the transmission of the string. You can just enable the TXE interrupt after setting up your transmit buffer or pointer and have the interrupt service routine send the first byte and all subsequent bytes until the end of string character.
The other choice is to send the first character manually by calling the send function and letting the transmit interrupt code send the rest. However, make sure that the transmit register empty bit is not causing a problem. You might break out the inside of the send routine into a helper function.
You will need a way to know that the transmission of the string has completed.
Be sure to use the volatile keyword on any variables that are updated by an interrupt service routine.