Bootloader test

[Synthex]

Can you post the screenshot of the fuses settings in PonyProg and a dump of the flash memory?

[dmitri]

Weird... it seems alright to me. It should jump to bootloader on reset. I'll double check it tonight.

[Synthex]

I do it one more time ... and now it works ...

[Synthex]

Is it possible to get the bootloader for Atmega644 in 20MHz and 24MHz ?
Thanks

[dmitri]

Here is a new version of the bootloader:
see latest version down this thread

This version is "multiclock" capable.
As before:
To enter the bootloader - hold key LEFT pressed while powering up.
While in the bootloader:
To select MCU clock - press key UP. The selection is between 12/16/20/24MHz (16MHz by default). The selected clock will be displayed on an LCD.
To cancel the firmware update - power cycle without pressing any other key.
To start the firmware update - press key DOWN. It will erase an old firmware and wait for Sysex with a new firmware.

And this is the bootloader source code:

BootloaderSysex.zip

[Synthex]

Good news for fools of overclocking !

[dmitri]

This is an updated version of the Bootloader for Atmega32, Atmega324 and Atmega644:

Bootloader_20081008.zip

This is the source code:

BootloaderSysex.zip

In this version when sysex firmware is being sent to MegaDrum the MIDI LED is flashing with every ROM page write (around 20 flashes).

Note on overclocking. I'm doing most of the development and testing with Atmega32. Although overclocked to 20Mhz it appears to work fine with MegaDrum firmware.
But when I try to program it using the bootloader, most of the time it either fails to finish a firmware update or some regions of ROM become corrupted after an update. I guess the same may happen with Atmega324 and Atmega644 if overclocked to 24MHz. Be warned.

[dmitri]

And also note the buffer size change from 40000 to 60000 in the first post:

Now you can upload this file using MIDI-OX. But before doing this you MUST set 'Low Level Output Buffers' to at least 60000 (in MIDI-OX menu go Options->Configure Buffers and set Output, NOT Input, Buffers to 60000).

[japi]

I couldn't make the bootloader to work. I uploaded the bootloader as per the instructions, that worked, but when rebooting megadrum with left pressed, the screen would not show anything. If I press right it would show the "up: clock speed / down:ok" thing. Pressed down and sent firmware with midi ox but not luck. Buffers are at 60000 as suggested here. I tried with MD config tool but no luck either, it would say that couldn't send the file.

After a few tries, sometimes it would lock and no response to any button and had to upload the bootloader again.
Any thought?

[Synthex]

Do you set configuration fuses for the Atmega ?