Just wondering if I can get some help here.
I have a simple scheme of MIDI controller based on ATmega32u4: ATmega32U4 with TXLED and RXLED as output pins and USB functionality
And my team wants me to make this device Android/iOS compatible (because our Arduino prototypes worked fine with iPads and even iPhones).
Meanwhile, when I make almost the same scheme and run the identical sketch on ATmega328 chip it works just fine!
I tried running all the stuff on Arduino boards, and the result is stable:
- works on Arduino Uno and Arduino Mega (based on ATmega328 chip);
- doesn't work on Arduino Micro and some of its Chinese clones like Arduino Micro Pro (based on ATmega32u4).
We've found a small trick/workaround: connect even two our ATmega32u4 devices through an active USB hub with additional power supply to one iPad, and they both work perfectly, then we switch off the additional power on the hub, and devices continue to work fine using the power from this single iPad without any messages about high power consumption. This case leads me to the thought that high consumption of ATmega32u4 chip appears only on the device initialisation stage.
Is there a way to solve this?
Thanks in advance.