11-28-2016, 12:54 PM
(10-10-2016, 02:10 PM)g_t_j Wrote:(10-07-2016, 07:22 PM)pfeerick Wrote: Does your pine64 board have a jumper on it for BATT and DC in (it's near where the wifi module goes)? Can you make sure it's in the DC in position, otherwise the PMIC may indeed current limiting the output to the USB ports. It would also explain why you're not seeing any voltage change when powering via microUSB and Euler. I suspect your drive is not getting the current it wants, as my external 1TB drive will draw in excess of 600ma when spinning up, and if the jumper is in the batt position, the PMIC is providing power to the USB ports, and current limits, which is what causes the clicks, as the hard drive isn't getting the current it needs to fully spin the hard drive platters up to speed. It it continues to be a nuisance, it may be easier to simply use a USB hub with external power pack, and you can use that to power both the pine64 board and the USB hard drive.Thank you very much for the helpful post.
I was not aware of the jumper you mentioned. Checked it and it's on DC position.
I'll have to try that power supply which provides 5.2V.
Any other thoughts are welcome.
USB current is not limited by the AXP PMIC, but by dedicated current limiters. The jumper does not have any effect on these.