[Solved] CPE 325 Assignment #9

Assignment

You are given a program for the MSP430F2013 microcontroller in a binary form (source code is not available to you). This program implements a simple beacon, controlled via the SPI interface. The beacon works as follows:

• LED3 is turned on during one time slot (one time slot lasts for 32 milliseconds). After that first time slot, there is a pause when LED3 is turned off. This pause lasts for P time slots. After that, the cycle repeats.
• When the program receives a number from the range 1-100 via SPI, it sets P to that value, allowing to change how often the beacon blinks.
• When the program receives 0, it replies with the current value of P through SPI.
• When the program receives 255, it turns LED3 off completely.
• The program ignores all other numbers received through SPI.

Load that program to MSP430F2013 and do the following assignment:

1. Write a program for MSP430FG4618 that asks the user to enter P in Putty/MobaXterm as follows: Beacon pause: .

When a number from 1 to 100 is entered and the ENTER key is pressed, the program converts the entered value to a number (you can use atoi function for this) and sends this value to MSP430F2013 via SPI to change the pause of the beacon. Display a new message when the user hits ENTER.

If the user enters ? instead of a number, your program should send 0 to MSP430F2013 and read the response (the current length of the pause). Display the received value in Putty/MobaXterm at the new line as follows: Current pause: <pause>.

If – is entered, the master device sends 255 to the beacon to turn it off.

If an invalid string or number is entered, the program prints Invalid pause entered

2. Implement your own version of the program for MSP430F2013 with the same functionality. You can start with this part and not use the given program if you want.

Hints:

• You can reuse the functions that you made in the previous lab for UART communication as well as functions SpiGetState and SpiSetState from demo code.
• You can use the Watchdog Timer of MSP430F2013 in the same way as you did it with MSP430FG4618. Do not use ACLK: this clock source is not available in this microcontroller.

• Make a delay of a hundred clock cycles between SpiGetState and SpiGetState function calls when you request the current value of pause.

Bonus

1. will be given to students who demonstrate their assignment by establishing Bluetooth connection between MSP430FG4618 and PC rather than using RS-232 connection.
2. will be given to students who use DMA to copy data to the transmission buffer for UART communication instead of using a loop.