Using flashrom with Digispark...

[greekhero]

Hello, I would like to use digispark with flashrom to read/write flash supported by flashrom. Is it possible to use digispark + littlewire, connect the digispark to a computer, wire the digispark pin properly with the flash, then use the flashrom to read/write the entire content of flash?

I am a newbee so please pardon my ignorance.

Thanks,
Jay

[digistump]

Yes but you'd need to write the I2C or SPI code to talk to the flashrom

[gogol]

You should adapt this to the tiny-libraries:

http://flashrom.org/Serprog/Arduino_flasher

The difference is, that the attiny has no CORE SPI but only USI (Universal Serial Interface), which can emulate SPI/I2C but only with additional software.

When I was researching that, I went that way: http://digistump.com/board/index.php/topic,1127.0.html
So I could read/write SPI flash chips just out of the box.

[greekhero]

Thank you very much for your reply. I noticed that the  UM232H-B-WE you mentioned has a VCC 5V whereas the chip I am using has VCC 3.3V.  Would I need to use a resistor to bring the voltage down or 5V would be fine? I am hoping to read/write MX25L3205D http://www.macronix.com/Lists/DataSheet/Attachments/1534/MX25L6405D,%203V,%2064Mb,%20v1.5.pdf

cheers,

Jay

[gogol]

I answered in the other thread, where I believe, that answer belongs to: http://digistump.com/board/index.php/topic,1127.msg5865.html#msg5865