01-10-2016, 04:47 PM
(This post was last modified: 01-10-2016, 04:47 PM by ssvb.
Edit Reason: typo fixes
)
(01-10-2016, 03:29 PM)tllim Wrote: The VBUS connect to a power switch LPW5210B5F with pine 4 en pin tie to high and Rset set as 10K. Here is the LPW5210 data sheet link: http://www.kcttek.com/uploads/soft/LPW5210.pdf. Please lets us know on your concern so that we can explore together.Thanks! I was just curious about the use of USB OTG. If somebody plugs a USB A-A cable to the lower connector, then the PC is going to be providing +5V on VBUS, which is potentially undesirable. But the LPW5210B5F power switch has reverse current protection. Though I'm not quite sure if it is a good idea to have the EN pin pulled up by default (enabling the VBUS power on reset) for the lower USB connector. As for detecting the "device" vs. "host" mode, please have a look at USB0-VBUSDET on the A13 tablet reference schematic. This might be an alternative to the unavailable ID pin.
But admittedly this all is about a rather niche feature, because the majority of users will probably not care about booting over USB.
BTW, can anyone with a Pine64 board and USB A-A cable check if the FEL mode is actually available and paste the "sunxi-fel ver" output?
