Putting HABL on an atmega168 MCU using USB in system programmer


For atmega168 replace 168 with 88 on appropriate places


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:

                  ATMEGA168 28pin DIL
                   +------------+
         reset ----| 1          |
           RxD ----|            |
           TxD ----|            |
                   |            |
Resonator          |            |
16MHz              |            |
+---+      VCC ----| 7       22 |------------- GND
|  2|----- GND ----| 8          |
|  1|---- XTAL1 ---| 9       20 |---- VCC ---- VTG
|  3|---- XTAL2 ---| 10      19 |------------- SCK
+---+              |         18 |------------- MISO
                   |         17 |------------- MOSÍ
                   |            |
                   |            |
                   +------------+

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 AVRISPMKII connector.
Used this to connect computer to J1: http://www.eit.se/opto_usb_uart



Programming the device 

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


First the fuse bytes needs to be programmed.



Extended fuse byte

For boot loader reset.
BOOTRST shall be 0

For boot loader size 512 words:
BOOTSZ1 shall be 0
BOOTSZ0 shall be 1
(If you use 1024 byte boot loader you need something else here.)
(If you change to use a 1024 word boot loader then you may neeed to adjust) (START_ADRESS_OF_BOOT_SECTION in Makefile also.)


With all other bits deafault the extended fuse byte should be: 11111010 

For some reason that did not work for me, used hex: 0x02 instead (that worked).

Write one byte 0x02 i a file 0x02.bin then:
avrdude -p m168 -P usb -c avrispmkII -U efuse:w:0x02.bin:r -u   -B 8







High fuse byte

Used default (did not change it).




Low fuse byte

To use 8 MHz internal clock CKSEL shall be 0010 and CKDIV shall be 1.
With all other bits default this gives 11100010, in hex: 0xE2

But I use a resonator so CKSEL=1111 which gives lfuse 0xEF 
(but 0xEE will do also)



Write one byte 0xEF in a file 0xEF.bin then:
avrdude -p m168 -P usb -c avrispmkII -U lfuse:w:0xEE.bin:r -u   -B 8









Downloading the boot loader program to flash


write:
avrdude -p m168 -P usb -c avrispmkII -U flash:w:habl.hex  -B 8