18f4550 bootloader compatible with 18f2550?

rhasta · Joined: 06 Feb 2007 Posts: 2

im new in PIC, n i hv the 18f4550 bootloader firmware, did anyone know that the firmware for 18f4550 can be used on 18f2550 too?? is these firmware is compatible within their family?? n if they are not compatible, may i know where can i download those bootloader firmware?

thanz for viewing..

meereck · Joined: 09 Nov 2006 Posts: 173

Hello, if you are speaking about USB bootloader, you can get if from here:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2124&param=en022627
It is compatible with 18F2455 (I use it) and 18F2550 as well.
You need to compile it in Microchip C18 compiler (but before the demo version expires, because you lose compiler's optimalisation which causes the bootloader bigger than 0x800h (=boot space of a PIC)).
BR

rhasta · Joined: 06 Feb 2007 Posts: 2

thanz for your reply.. i wil try it ...

meereck · Joined: 09 Nov 2006 Posts: 173

More information and issues can be found on Microchip forum : http://forum.microchip.com/tt.aspx?forumid=102
I have tried the usb bootloader. You don't have to change a linker file. You can compile it for 18F4550 a download it in 18F2550 after that.
Just this have to be changed : Set appropriate configuration bits (PLL, etc.). Mine are shown at the following picture (everything which is at the bottom is "Disabled")
http://meereck.wz.cz/USB-BTconfbits.gif