USB flashing/Li-po boards



#2

Are these still available? Since the programming cables seem to be unavailable, I was thinking about soldering it onto the 30b board, flashing, and then removing it.


#3

Don't remove it, leave it in for updates and communication with the PC or Mac. I think Harald Pott still sells the boards. The "normal" USB board with power and LED support should suffice.


#4

Come to think of it, would something like this work?

If I connected the TX, RX, etc, to the appropriate pads among the set of 6, would it work?


#5

Yes it will work. I've used an FTDI 3.3V cable instead, connected through a 2.5mm stereo jack. Here is the story.


#6

Very cool project. From your work it seems that only Tx, Rx, and ground need to be connected (assuming reset and erase are handled separately). Is this correct?


#7

You are right. ERASE is just a short between two pads (the erase pin and +3V). RESET is available as a separate button on the device (there is a tiny hole in the back).

The simple connection with the 2.5mm jack seems cool but implanting one of Harald's boards is way cooler. d:-D


#8

Using an FTDI breakout board, I was able to reflash a 34S with a broken LCD and no other issues, but experienced some strange issues. This 34S had the crystal installed and had the calc_xtal_full firmware. I put it in bootloader mode and was able to flash the calc_full (not calc_xtal_full) firmware right away. After the flashing, it would randomly turn off after I turned it on, sometimes right away, sometimes after tens of minutes. So, I flashed calc_full again, again without any issues. The calculator was still randomly turning off, so I put it into bootloader mode again (now the third time) and tried to flash calc_xtal_full, but I'm not able to. The calculator isn't giving any response to the programming attempts. Any idea what the issue could be?


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