Links: CodeVisionAVR Atmel

The original Megaload bootloader for Atmel ATmega chips was written by, and is maintained by Sylvain Bissonnette. It is described on his site at http://www.microsyl.com/megaload/megaload.html . I have converted the firmware for CodeVisionAVR use. At the moment it is just converted for writing to flash. For that purpose it is compatible with Sylvain's windows program. A modified windows program is available at CVmegaload.exe It is set up so that the firmware can be loaded either on reset or by sending a 4 byte code which must be duplicated in the firmware application. It has options to send the code on opening and to close after a succesful write. The RTS and DTR lines can also be set/cleared for powering hardware.  All options, codes etc are stored in the windows registry with the key "SOFTWARE\\CVmegaload\\interface". The menu should be self explanatory. I've added lots of comments to the source code on cvmegaload.c The header file contains the defines in the format suggested by Pavel. cvmegaload.h This alternative file is needed if you are using UART1 cvmegaloaduart1.h Associated project files: cvmegaload.cwp cvmegaload.prj Example code for an application program is on cvmlapp08.c It shows the code for jumping to the bootsector and for implenting the 4 byte bootload code. Otherwise it just flashes an LED. Associated project files: cvmlapp08.cwp cvmlapp08.prj Its only tested on the mega8 and mega32 and is functional for the mega128 with code below 64k. Ralph Hilton ralph@ralphhilton.org