Irom?

[dgktkr]

Originally Posted by trimesh

...

All your comments about loading down vbuck are accurate - but in practice 1R2 has worked pretty well on all the boards I've tried - yes, the resistor gets hot, but I tend to only connect it for a fraction of a second, so it's not really noticable.

I also use a bench power supply rather than a battery - this is useful since watching the ammeter on the output lets you know if the resistor is connected properly (no resistor = about 50mA / resistor connected = about 350mA) - so all I do is position the probe on the 1.8V line, and then connect the test clip to the battery positive - and then immediately remove the probe on the 1.8V.

If the board is booted normally, it will shut down (and the current will drop to zero) about 1 second after the power is connected - if it's in blank mode, it will just sit there taking 30-50mA

I couldn't get the VBUCK overload technique to work on my V195.

I used a bench supply with the voltage set to 4V and the current limit set to 0.5A and resistors from VBUCK to ground from about 1.0 to 1.3 ohms. For starters, I tried connecting the supply and then switching it on and removing the resistor a moment later. When that didn't work, I tried turning on the supply first, and then connecting it to the phone, removing the resistor after the power was applied. The current would go > 90mA for a fraction of a second and then drop to zero, even while the resistor was still connected.

The phone would not response to USB polling in this state, which would change if the mechanism for the red power key was pressed and held. At that point, it would be in the modem state -- 0x4902.

Any greater than 1.3 ohms, the phone would turn on normally (modem state) when the power was applied.

Does anyone know what the USB ID for a Motorola phone is when it is in Blank mode?

[trimesh]

Originally Posted by dgktkr

I couldn't get the VBUCK overload technique to work on my V195.

I used a bench supply with the voltage set to 4V and the current limit set to 0.5A and resistors from VBUCK to ground from about 1.0 to 1.3 ohms. For starters, I tried connecting the supply and then switching it on and removing the resistor a moment later. When that didn't work, I tried turning on the supply first, and then connecting it to the phone, removing the resistor after the power was applied. The current would go > 90mA for a fraction of a second and then drop to zero, even while the resistor was still connected.

That sounds like you were trying to pull too much current, and the ATLAS shut down - if it's working, then the board will pull between 300-400mA from the moment you connect the power, and then drop to ~50mA once you remove the overload.

The easiest way to see that it's worked is simple - the board doesn't power off - normally when you first connect the power, it will turn on for about 1S, and then shutdown. When you manage to force it into the IROM, it just sits there running.

As far as I know, the USB IDs don't change between blank and reflash mode.

[Jabbacks]

Wow, did some programming in Cobol (Data Processing) & BasicA (DOS 6.2), file dumping and extracting (hex/ascii /binary codes) data from these so called new cash registers which are scanning barcodes. Idea was to keep track on who's buying too much of what in 1 day based on employee #'s. Got that up and running in 3-months time. Left the company though.

But I tell you guys, I've never gone this far down the hexadecimal lane. Very impressive. I give it Two-Thumbs-Up!