I bought some ATmega328, not 328
P, for a new project. I think the trouble started here. There are lots of pages in Internet explain how to burn the boorloader onto a microcontroller using Arduino board. I followed those instructions and successfully burned the bootloader but I was confused by those instructions at the same time. So here is yet another instructions.
- ATmega328 (not 328P) without bootloader
- Arduino Uno
- Arduino Leonardo (as ISP)
Wiring
Use jumper wires to connect two boards.
| Leonardo
|
-
|
Uno
|
| 10
|
-
|
Reset
|
| 11
|
-
|
11
|
| 12
|
-
|
12
|
| 13
|
-
|
13
|
Use Arduino as ISP
I used Arduino IDE 1.6.8 on a Linux box. It is the latest version (Mar/2016).
- Open a sketch
File menu -> Examples -> 11.ArduinoISP -> ArduinoISP
- Select a board
Tools menu -> Board -> Arduino Leonardo
- Select a port
Tools menu -> Port -> /dev/ttyACM0 (Arduino Leonardo)
Because I did not use ISP connector (2x3 pins), I uncommented the following line (line 81) in the source code.
#define USE_OLD_STYLE_WIRING
Then click Upload button to upload the sketch to Leonardo.
Burn the bootloader
I had to edit boards.txt (
arduino-1.6.8/hardware/arduino/avr/boards.txt) to burn the bootloader and to build/upload a sketch later. I modified "Arduino/Genuino Uno" entry to support both 328P and 328.
- Comment out the line.
# uno.build.mcu=atmega328p
- Add the following lines.
uno.menu.cpu.atmega328p=ATmega328P
uno.menu.cpu.atmega328p.build.mcu=atmega328p
uno.menu.cpu.atmega328=ATmega328
uno.menu.cpu.atmega328.build.mcu=atmega328
Then you will see new menu item if you select "Arduino/Genuino Uno". (If IDE is running, quit and run again to take effect.)
- Select a board
Tools -> Board -> Arduino/Genuino Uno
- Select a processor
Tools -> Processor -> ATmega328
- Select a port
Tools -> /dev/ttyACM0 (Arduino Leonardo)
- Select a programmer
Tools -> Programmer -> "Arduino as ISP"
- Burn
Tools -> Burn Bootloader
Upload a sketch
Somehow if you select Processor: "ATmega328" and upload a sketch, it failed.
avrdude: Device signature = 0x1e950f
avrdude: Expected signature for ATmega328 is 1E 95 14
Double check chip, or use -F to override this check.
It said device signature was wrong. 0x1e950f is 328P's device signature and as message said 0x1e9514 is 328's device signature. I was confused but I just tried to build/upload with "ATmega328p", and it succeeded. A sample sketch worked okay too.
This is one thing I still cannot understand. Optiboot overwrites device signature? But anyway I can now upload a sketch to ATmega328 using Uno board and it is ready for a new project.
Appendix) Failed attempt
At first, I used a breadboard instead of Uno. And selected "Arduino Duemilanova or Diecimila" board when burning a bootloader. But it failed because of device signature mismatch.
avrdude: Device signature = 0x1e9514
avrdude: Expected signature for ATmega328P is 1E 95 0F
Double check chip, or use -F to override this check.
In boards.txt, build.mcu is defined as below.
diecimila.menu.cpu.atmega328.build.mcu=atmega328p
I guessed it was the cause and removed 'p'.
diecimila.menu.cpu.atmega328.build.mcu=atmega328
Then it successfully burned and 13pin/led started blinking. I removed the ATmega328 from a breadboard, placed it on Uno board and uploaded a sketch. But I got the following error.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
I checked boards.txt again and I thought it was because Uno's build.mcu was ATmega328P. And so removed 'p' again.
#uno.build.mcu=atmega328p
uno.build.mcu.atmega328
But I still got the same error.
I was about to give up and I almost ordered new ATmega328P, but I found the way to burn ATmega328 using Uno board. I have to lean some more basics of a microcontroller, a bootloader and a board...
