Nuts and Volts - April 2010

■ FIGURE 15. AVRUP VI.

■ FIGURE 16. Hello test.

something (an uploader) is on the port and knows how to speak bootloader talk, then the bootloader and the uploader collude to take the application program from the PC and put it in the AVR application memory (overwriting the previous application). The bootloader’s final act is to set the AVR to run the application.

Uploading With AVRUP V1

are going to build all this and have it go as smoothly as indicated by this Workshop? Remember what I said about failing your way to success? Well, all I can say is that I messed up multiple times at every step, but did eventually get it all working. You have all the source materials and should be able to duplicate my success. Next month, we are going to take all we’ve learned of late and build an even more capable system to support our future learning about the AVR architecture and C programming. NV

Open AVRUP V1, click on the ‘File to upload’ menu item, and select the Hello_World.hex file from whereever you stored it. Next, click the ‘Select Port’ item and select the COM port your Breadboarduino is using (this item should be familiar from the last three Workshops). Next, click on the ‘Select Board’ item and select the ‘ATmega168.xml’ file. The ‘AVRDude Script’ window should look like the one in Figure 15 (except for the m328p which should be m168p). Now, click ‘Upload to Board’ and watch your Breadboarduino LED flash indicating reset, and note that the red and green LEDs on the SparkFun board twiddle around as avrdude communicates with the bootloader. The ‘AVRDUDE Response’ textbox fills with lots of information and is followed by ‘avrdude.exe done. Thank you.’ Finally, fire up Simple Terminal and test the board as shown in Figure 16.