Replacing atmega32 with atmega64

[Simone Fabris]

So...

Flash and eeprom are getting full... Why not replace the Atmega32 with Atmega64?

Firmware should not need any major modification, and we get double flash, double ram and double eeprom.

And we could also play Mario Bros (https://www.youtube.com/watch?v=MsaYcX5aIac) :-)

What do you think?

Ciao

Simone

[Paweł Si]

most of the work I'm doing is to optimize the code so that it

fits into 32KB of program memory, it would be grate to have more,

but it is probably simpler to buy a M0517 charger it has 64KB of memory

and it has a better 12bit  ADC - personally it's currently my favorite charger.

[Simone Fabris]

12 Bit ADC is a nice plus.

What are reliable supplier of M0517 charger? I know that this could be a hard question...

Thanks

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[Morten Schmidt]

Interesting. What are the practical advantages of the 12-bit ADC?

[Paweł Si]

2015-07-15 17:26 GMT+02:00 Morten Schmidt <morten.s...@gmail.com>:

Interesting. What are the practical advantages of the 12-bit ADC?

In theory the voltage measurement accuracy should be greater.

 

[Diogo Carvalho]

What files I have to change if I have the Atmega64? 

[Paweł Si]

do You really have a charger with a atmega64 CPU?

can you do some pictures?

2015-11-10 10:09 GMT+01:00 Diogo Carvalho <diogoc....@gmail.com>:

What files I have to change if I have the Atmega64? 

you need to change:

1.  https://github.com/stawel/cheali-charger/blob/master/avr-compiler.cmake#L15

 to "atmega64"

2.  some files in https://github.com/stawel/cheali-charger/tree/master/src/hardware/atmega32/cpu

 probable only the IO.h file 

3. defiantly the pin layout:  

  for 50W chargers: https://github.com/stawel/cheali-charger/blob/master/src/hardware/atmega32/generic/50W/imaxB6-pins.h

  200W charger: https://github.com/stawel/cheali-charger/blob/master/src/hardware/atmega32/generic/200W/GTPowerA6-10-pins.h

4. and maybe some other stuff, based on your hardware.

[Diogo Carvalho]

No, I have a clone with a unknow cpu, but it is very bad.

I will make some improvements in the hardware and change the cpu.

I'm thinking in atmega64 because it have more memory and have more disponible pins.

Thanks. I will try change that files to atmega64.

[Diogo Carvalho]

Ok, I modified the files for atmega64 and at least I have some text in the lcd.

PS. The project compiled successfully in AtmelStudio. It is much easier for editing and compiling the source.

[Paweł Si]

2015-11-13 17:09 GMT+01:00 Diogo Carvalho <diogoc....@gmail.com>:

Ok, I modified the files for atmega64 and at least I have some text in the lcd.

could you make some pictures of your chargers PCB?

[Diogo Carvalho]

I have not modified the pcb yet.

It is the same clone version from this photo:

http://i.hizliresim.com/KDv1r3.jpg

If anyone wants I have draw in Eagle the schematics of the original and clone Imax B6 

[Paweł Si]

2015-11-13 21:38 GMT+01:00 Diogo Carvalho <diogoc....@gmail.com>:

I have not modified the pcb yet.

It is the same clone version from this photo:

http://i.hizliresim.com/KDv1r3.jpg

is it exactly the same? Your charger has also a 12MHz crystal  oscillator?

what kind of crystal  (frequency) will you use in your mod? 

 

If anyone wants I have draw in Eagle the schematics of the original and clone Imax B6 

nice!,  I would like to see them,

although there are already schematics for the imax B6:

http://www.rcgroups.com/forums/showatt.php?s=df7049bcbafdb5d7d06765c264e5c4bb&attachmentid=3693125&d=1293732709

 

[Diogo Carvalho]

sexta-feira, 13 de Novembro de 2015 às 22:02:45 UTC, cheali-charger escreveu:

is it exactly the same? Your charger has also a 12MHz crystal  oscillator?

what kind of crystal  (frequency) will you use in your mod? 

 

Is is the same except mine dont have the 74hc4951.

It have  a 12MHz crystal but I will change to 16MHz because I will use your firmware. 

 

nice!,  I would like to see them,

although there are already schematics for the imax B6:

http://www.rcgroups.com/forums/showatt.php?s=df7049bcbafdb5d7d06765c264e5c4bb&attachmentid=3693125&d=1293732709

Yes I draw the schematic based on that file, but now I have the source file to edit what I want.

Here is that schematic and the other is from my clone.

I don't have yet the final circuit of my modded Imax, but I'm planning some improvements in various blocks. 

  

[MiKa]

Hi,

can You share Eagle files too?

MiKa

Dňa sobota, 14. novembra 2015 2:05:02 UTC+1 Diogo Carvalho napísal(-a):

[Diogo Carvalho]

Here is the schematic files of my modded Imax.

[MiKa]

Hi,

Thanks for sharing!

Did You make also brd file?

MiKa

Dňa pondelok, 12. septembra 2016 10:15:57 UTC+2 Diogo Carvalho napísal(-a):

[Diogo Carvalho]

No, I have just made some small boards to add to my Imax clone.

I had planned to make a full board with all the changes, but the time is short and I ended by not doing.

[MiKa]

Hi,

It will be a good idea to have a new board  which can be fitted in the "ebay" Imax B6 enclosure, and maybe start to thing about high resolution I2C or SPI A/D converter like MCP3424 for voltage and current measure for better support of "one cell" charging.

Some for inspiration: http://ultrasmartcharger.com/ 

;)

Regards,

MiKa

Dňa pondelok, 12. septembra 2016 18:33:35 UTC+2 Diogo Carvalho napísal(-a):

[Diogo Carvalho]

Instead of an external ADC would be preferable to use a more powerful processor and with increased resolution of the ADC.

But this would involve major changes in the firmware.

[MiKa]

You have a "candidate" for the new CPU? 

Dňa utorok, 13. septembra 2016 9:33:57 UTC+2 Diogo Carvalho napísal(-a):

[diggit]

Anything modern supported by gcc. I'd go for some ARM based MCU or maybe MSP430.

Everything is gonna be more powerful than AVR, so graphic display capable. That means different enclosure...

Cheap, easy to get enclosure is necessary, but you won't get empty and cheap charger enclosure like Turnigy or Imax anyway.