As i've already written in another thread: The spec does not say to shorten them. Instead the spec says that you are supposed to connect them via 200 ohms. The n900 may work fine when shortening them, but shortening something always means that some significant power may flow over this short circuit. Using 200ohms instead is safe for any hardware as the current over the resistor is limited to 3.3V/200Ohms = 17mA. These resistors cost nothing and may protect that hardware, so they are really a good investment.
Hi, I trying this project for load battery on the road. 5V is generated without problem, the signal D- and D+ has 1.9V, when I try to attach N900 to my step up the charge not start. In dmesg I see: Code: twl4030_usb twl4030_usb: HW_CONDITIONS 0x50/80; link 1 twl4030_usb twl4030_usb: HW_CONDITIONS 0xd0/208; link 2 I tried also with 0.7V on D- D+ as written in batt_charging_1_1_FINAL.pdf but nothing. I have the kernel 2.6.28.10power46. I would like start the charge with only 500mA and not 1000mA. With 200 Ohms between D- and D+ which is the maximum source current? Thank you for the help
twl4030_usb twl4030_usb: HW_CONDITIONS 0x50/80; link 1 twl4030_usb twl4030_usb: HW_CONDITIONS 0xd0/208; link 2
I browsed through all these 10 pages rather quickly, so sorry if this is already answered; Could this however correct way (USB standard) of demand to shortcircuit D+ and D- be overridden somehow in software, through dbus or kernel parameter perhaps? It would just be so convenient to click something from a menu, than always carry both either self made or bought adapter and normal USB-data cable. So both synchronizations, fast data transfers and charge anywhere could be achieved.