Chameleon-AVR Nurve Networks, Chameleon-AVR Datasheet - Page 246

• Manufacturer Part Number: Chameleon-AVR
• Description: MCU, MPU & DSP Development Tools AVR8 & PROPELLER DEV SYSTEM (SBC)
• Manufacturer: Nurve Networks

Specifications of Chameleon-AVR

• Processor To Be Evaluated: AVR 328P
• Data Bus Width: 8 bit
• Interface Type: USB, VGA, PS/2, I2C, ISP, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Option 1, starts a 3 second countdown and then starts the X-Modem download. Thus, the PC side better already have
the XModem file transfer program ready and waiting. Moreover, the programs dumps the data to the screen in ASCII
format, so I suggest that what your transfer its human readable. Also, make it short, maybe a few hundred bytes to a
couple K. The AVR only has enough room for a 1K receive buffer in the X-Modem function, thus it only buffer 1K of the
data and writes it to the FLASH memory everything else is shown on the screen as its received, but lost. Option 1 is
shown in Figure 31.7 below.
Of course, you can alter the XModem receive function to write files directly to the FLASH as they are received block by
block, and you probably will need to.
Option 2, lists out the first 1K of the FLASH memory, so you can see what’s in it. Point, being you want to boot the
program, see what’s in the FLASH it, then download something, see if it changes, reset, re-boot, try again. And example
of Option 2 running is shown in Figure 31.8 below.
Thus, the usual order of operations will be to boot the Chameleon with the FLASH demo, then you might hit Option 2 to
see what’s in the FLASH’s first 1K of memory. Then you might decide to overwrite it with something, so you go to your
PC, set up the X-Modem download, start the file transfer and the PC program will wait…
Then you go back to the Chameleon’s local keyboard and press Option 1, then you will see a 3 second countdown and
the program will start downloading – as it downloads you will see the test stream across the screen.
Finally, I have created a few files for you to download with X-Modem that have short famous poems all located in the
Source directory here:
“The Road Not Taken” by Robert Frost
“O Captain! My Captain!” by Walt Whitman
“All the World's a Stage” by William Shakespeare
DVD-ROM:\ CHAM_AVR \ SOURCE \
Figure 31.8 – The FLASH demo displaying a file.
Figure 31.7 – The FLASH demo receiving a file.
- xmodem_test_file_road_not_taken.txt
- xmodem_test_file_o_captain.txt
- xmodem_test_file_all_the_worlds_stage.txt
© 2009 NURVE NETWORKS LLC “Exploring the Chameleon AVR 8-Bit”
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