Putting HABL on an atmega168 MCU using USB in system programmer




Install compiler and avrdude (on debian/ubuntu/mint style linux):
apt-get install gcc-avr avr-libc binutils-avr avrdude



To compile (optional):
make



Some HW will be needed.


AVRISP MKII pin configuration.

AVR ISP (In-System Programming) Pinouts
1  MISO
2  VTG
3  SCK
4  MOSI
5  RESET
6  GND

Contact seen from below:
 +---+---+------- 
 | 5 | 6 |-------
[  3 | 4 |-------
 | 1 | 2 |-------
 +---+---+------- red

Pin one is the one marked red on flat cable.





The test board used looked like this:

                  ATMEGA328p 28pin DIL
                   +------------+
         reset ----| 1          |
           RxD ----|            |
           TxD ----|            |
                   |            |
Resonator          |            |
20MHz              |            |
+---+      VCC ----| 7       22 |------------- GND
|  2|----- GND ----| 8          |
|  1|---- XTAL1 ---| 9       20 |---- VCC ---- VTG
|  3|---- XTAL2 ---| 10      19 |------------- SCK
+---+              |         18 |------------- MISO
                   |         17 |------------- MOSÍ
                   |            |
                   |            |
                   +------------+

A decoupling capacitor (100nF) between pin 7 and 8 is not shown above.

Connector J1 molex
+-------++
| 1 VCC ||
| 2 RxD ||
| 3 TxD ||
| 4 GND ||
+-------++

Connector J2 molex
+---------++
| 1 MOSI  ||
| 2 MISO  ||
| 3 SCK   ||
| 4 VTG   ||
| 5 Reset ||
| 6 GND   ||
+---------++




Power:                        7805
                             +-----+
batt+  ----diode>------------|     |-------------- VCC
                       |     +-----+     |
                   C1 ===       |       === C2
                       |        |        |
batt-  -------------------------+----------------- GND


C1,C2 = 100nF



Used an adapter cable from J2 to AVRISP MKII connector.
Used this to connect computer to J1: http://www.eit.se/opto_usb_uart



Programming the device (using avrispmkII)

Set read write properties on usb dev (or do this as root).





Check that you have connection with your device

avrdude -p m328p -P usb -c avrispmkII -U flash:r:flash.bin:r












First the fuse bytes needs to be programmed.


http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega328p




For boot loader reset.
BOOTRST shall be 0 (programmed)

For boot loader size 1024 words:
BOOTSZ1 shall be 0 (programmed)
BOOTSZ0 shall be 1
If you change here then you may neeed to adjust START_ADRESS_OF_BOOT_SECTION in Makefile also.
If bootloder is 1024 it shall start at 0x3C00

I use a 16 MHz resonator so CKDIV8=1, CKOUT=1, SUT=10, CKSEL=1110 

We have regulated 5V so brownout detection at 4.3 V 



avrdude -p m328p -P usb -c avrispmkII -U lfuse:w:0xFE:m  -u   -B 8
avrdude -p m328p -P usb -c avrispmkII -U hfuse:w:0xDA:m  -u   -B 8
avrdude -p m328p -P usb -c avrispmkII -U efuse:w:0xFC:m  -u   -B 8


When programming efuse I got "verification error... 0x04 != 0xfc". Seems we can ignore this error.


Perhaps we want "Watchdog Timer Always On" WDTON, but thats a later problem.






Downloading the boot loader program to flash


write:
avrdude -p m328p -P usb -c avrispmkII -U flash:w:habl.hex  -B 8




Test device with some hello world program.
Send the hello world binary using:
sudo apt-get install cutecom lrzsz
cutecom