ETEE 2201 Electronics Lab IV ET-AVR Board: Downloading and Executing Programs Tutorial

Transcription

1 ETEE 2201 Electronics Lab IV ET-AVR Board: Downloading and Executing Programs Tutorial The ET-AVR Support Board and the AVR-Stamp board form a development kit for the ATmega128 and other AVR processors. This development kit includes many useful features, including LED's, pushbuttons, adjustable analog inputs, speakers and more. There is also a large breadboard area to develop, build, and test your own designs. These boards are easily affordable, costing less than $75. To download programs to the ET-AVR, you will need additional software and a parallel port on your computer. This tutorial will guide you through the steps to download programs to the ET-AVR via the PonyProg2000 software. PonyProg2000 is free-ware. This tutorial assumes that you have installed PonyProg2000 on your computer. If you do not have PonyProg2000 yet, you may obtain a copy from one of 2 places: 1. PonyProg2000: 2. Borrow a CD from your instructor This tutorial will guide you through the steps required to: 1. Assemble the necessary parts of the ET-AVR Development kit 2. Download a program to the ET-AVR via PonyProg Execute a program This tutorial also assumes that you have written, assembled, and simulated an ATmega128 assembly language program and that you are now ready to download and execute the program on the ET-AVR. Step 1: Obtain the following parts: Figure 1: ET-AVR Support Board Figure 2: AVR Stamp Board

2 Note: Key position on connector Jumper positions: Free pins Arrow on card should be on the same side as the arrow on the butterfly board Figure 3: The Parallel Port Card (left), Programmer Interface (right), and Ribbon Cable Step 2: Orient the ET-AVR Support Board and the AVR Stamp Board as shown in figures 1 and 2, and then place the stamp board in the support board as shown in figure 4: Power Connector on Support Board LED on Butterfly Board Figure 4: Assembled ET-AVR Support and Stamp Boards

3 Step 3: Connect the ribbon cable to the parallel port card and the programmer card as shown in figure 3. Insert the parallel card into the parallel port of your computer (Note: in some instances you may have to plug the parallel port card into the computer before you power-up the computer). Step 4: Insert the programmer interface card into the ET-AVR Development kit as shown in figure 5 and then apply power to the board. Arrow on Programmer Interface Arrow on Butterfly Board Figure 5: Assembled ET-AVR Support and Stamp Boards Step 5: Execute the PonyProg2000 program. You should see the following screen: Figure 6: PonyProg2000 Software Step 6: In the Device Menu choose Device-> AVR Micro-> Atmega128:

4 Figure 7: Choose a device Step 7: In the Setup Menu choose Setup-> Interface Setup. In the dialog box that appears, choose Parallel, then Avr ISP I/O, and then LPT1 (or whichever port you ll be using). Click [OK]: Figure 8: Interface Setup

5 Step 8: In the Setup Menu choose Setup->Calibrate. When the dialog box appears, click [Yes]: Figure 9: Calibration Dialog Step 9: You are now ready to load a program into PonyProg2000 so that you can download it to the ET- AVR Development kit. To do this, open a hex file (previously assembled program). The hex file will have the extension.hex (You may need to make extensions visible in Windows). In the File Menu, choose File-> Open Program (FLASH) File : Figure 10: Loading a program Step 10: Navigate to the appropriate directory (the one in which your hex file is stored), click on the hex file and then the [Open] button: Figure 11: Load hex file

6 Step 11: With the hex file showing, you are ready to download the program to the ET-AVR: Figure 12: Hex file Step 12: In the Command Menu, choose Command->Program.. Make sure the Parallel Port Card is attached to the parallel port of your computer and the Programmer Interface is attached to the ET-AVR properly (see figures 3, 4, and 5): Figure 13: Load hex file Step 13: PonyProg2000 will cycle through a number of messages, namely: Erasing, Writing, Verifying, etc.

7 Figure 14: Writing to ET-AVR If all is successful you will see the following dialog box: Figure 15: Successful Download Step 14: After the program is downloaded, it should begin to execute on its own. At this point you can remove power and then the programmer interface. Restore power and the ET-AVR will continue executing your program (remember, the program is in Flash Memory and will stay there until your next download). Below, I am showing a program being executed that will light one LED, keep it on for about 1 second, turn it off, then light the other LED for about one second: Figure 16: Successful Program

8 This next image shows a working Burglar Alarm Circuit/Program. The 1 st image shows the blinking 0 on the 7-Segment LED (of course you cannot see it blinking). Notice that all switches are closed, simulating all doors are closed. Figure 17: Initial State of Burglar Alarm The next image shows the alarm working (note; switch 8 is open and 8 is displayed on the LED) Figure 18: Door 8 is open The alarm is producing an annoying 2.5kHz buzz. The next image shows an oscilloscope screen measuring the input to the speaker:

9 Figure 19: Annoying 2.5 khz buzz