Rev Author Line No. Line
3514 miho 1 i2c-tiny-usb - (c) 2006 by Till Harbaum
2 ---------------------------------------
3 http://www.harbaum.org/till/i2c_tiny_usb
4  
5 The firmware code itself is distributed under the GPL, but
6 one of the usb codes comes under a separate license. Plase see
7 the .txt files in usbdrv for details.
8  
9 The default configuration is for a attiny45. The Makefile.mega8
10 allows to compile the device for the Atmega8 cpu. This includes
11 the possibility to use the atmega8 rs232 for debugging.
12  
13 The attiny45 has to be programmed in high voltage serial
14 programming (hsvp) mode since this application needs the
15 reset pin to be reconfigured for other use.
16  
17 This project supports two usb implementations: the avrusb and
18 usbtiny. Due to this four Makefiles exist:
19  
20 Makefile-avrusb.tiny45 - build with avrusb for Attiny45
21 Makefile-avrusb.mega8 - build with avrusb for Atmega8
22 Makefile-usbtiny.tiny45 - build with usbtiny for Attiny45
23 Makefile-usbtiny.mega8 - build with usbtiny for Atmega8
24  
25 Just type
26 make -f Makefile-avrusb.xxx program
27 or
28 make -f Makefile-usbtiny.xxx flash
29  
30 to compile and upload the file. Please adjust e.g. programmer
31 settings in the Makefile.
32  
33 If you don't want to recompile the firmware yourself you might
34 use the included firmware.hex which is a prebuilt binary for the
35 attiny45. Plase make sure you adjust the fuses accordingly.
36 They need to be set to "external crystal > 8Mhz" and the RESET
37 pin has to be disabled in order to be re-used for application
38 specific purposes. See Makefile-avrusb.tiny45 for more details.