Flashing
Contents
Flash AVR Net-IO with "ATMEL Evaluations-Board" made by Pollin
As a beginner it's difficult to understand everything in terms of flashing. And it's also difficult to find all information.
What's needed?
- AVR Net-IO
- ATMEL Evaluation-Board
- a 1 on 1 Cable for the ISP-Port (10-pin Connector).
Other ISP Programmers
If you have a ISP-Programmer with 6-pin port you can create an adaptor. You can see the pin configuration in figure 4-1 at page 5 AVR042: AVR Hardware Design Considerations.
Warning: Pin 4 of the 10-pin connector is not used on the Net-IO. GND has to be connected to one of the other Pins (6, 8 or 10)
Flashing with Linux
- Connect the 10-pin Cable to the ISP-Connector.
- Plug in the power adaptor of the AVR Net-IO.
- If everything is connected right, the yellow LED of the Evaluation-Board is shining.
Setting the FUSE-Bits
- Calculate the correct FUSE bits for your controller/setup - you can use http://www.engbedded.com/fusecalc/ for that
- Important: in the condition as supplied the 644 is programmed to 8 MHz internal RC-Oscillator and the clock is divided by 8 -> 1 MHz clock speed. If an external Quarz is used, the Bit CKDIV8 has to be set to 0. Also make sure that you leave Serial program downloading (SPI) enabled!
- Connect the ISP and the power.
- Set the FUSE-Bits with avrdude
- Reset the controller
Flashing the Image
After compiling the ethersex.hex you can flash it with avrdude. The following commands depend on your ISP-Programmer. This example is for a serial connection:
avrdude -v -p m32 -c ponyser -P /dev/ttyS0 -U flash:w:ethersex.hex
For a USB-ISP-Programmer this command should be used:
avrdude -v -p m32 -c stk500v2 -P /dev/ttyACM0 -U flash:w:ethersex.hex
For a parallel ISP-Cable:
avrdude -p m32 -e -c stk200 -U flash:w:ethersex.hex
Parameters for MyAVR mySmartusb light (the -e is important):
avrdude -p m32 -e -c stk500v2 -P /dev/ttyUSB0 -U flash:w:ethersex.hex
After flashing remove the ISP-Cable and interrupt the power connection for a short time to reboot the board.
* -p m32: ATMega32; -p m644: ATMega644 * -v: display debug messages * -c ponyser: the way avrdude speaks with the Evaluation Board; -c stkk500v2 for the Atmel board * -P /dev/tty.serial the serial port your programmer is connected to; -P COM1 for windows machines * -U the command you want to execute. In our case we want to flash: -U flash:w:ethersex.hex
Replace ATMega32 with an ATMega644, ATMega644p or ATMega1284p
ATMega644, ATMega644p and ATMega1284p have got a bigger flash then the ATMega32. This gives the possibility to add more modules to your Image.
Swapping the Microcontroller
- Disconnect power and ISP-Connector.
- Remove the old processor from your board.
- Insert the new processor while the slot is at the same position as in the socket.
Differences between ATMega32, ATMega644, ATMega644p and ATMega1284p
| ATMega32 | ATMega644 | ATMega644p | ATMega1284p | |
|---|---|---|---|---|
| Housing | DIL-40 | DIL-40 | DIL-40 | DIL-40 |
| MHz | max. 16 | max. 20 | max. 20 | max. 20 |
| Flash | 32 KB | 64 KB | 64 KB | 128 KB |
| EEProm | 1 KB | 2 KB | 2 KB | 4 KB |
| RAM | 2 KB | 4 KB | 4 KB | 16 KB |
| I/O | 32 | 32 | 32 | 32 |
| PWM | 4 | 6 | 6 | 6 |
| ext. INT | 3 | 32 | 32 | 32 |
| Ser-Port | 1 | 1 | 2 | 2 |
Datasheets
Flashing with Windows
There a two main possibilities:
- Flash with avrdude
- Flash with AVR Studio
Flashing with avrdude
The flashing with avrdude is just like in Linux.
You can get the Windows-Binary as a part of WinAVR
In the command line you have to adjust the name of the serial Ports. (COMx instead of /dev/ttyxx)
avrdude -v -p m32 -c ponyser -P com3 -U flash:w:ethersex.hex
If the programmer is connected via USB you need:
- for real USB-Programmers: libusb0.dll (Part of WinAVR)
- USB-to-Serial Converter a matching Driver: [1]
Flashing with AVR Studio
AVR Studio from Atmel offers a GUI to Controll the ISPs.
AVR Studio also brings USB-Drivers for the Programmers with it, which can be installed together with it.
For USB-to-Serial converters you need a matching Driver: [2]
