So i was working on controlling my robot via my arduino 2560 ADK when i think i did some real damage to my board.
The arduino was wired to a motor driver circuit. The motor driver circuit was powering the arduino with 5v. (LM35) + GND. and the motors were powered by a 12V battery.
initially, i did not give the arduino any external power. letting it power from the USB allowed me to control the motor from the serial console. but the motor speed was very slow.
(it was much faster if i simply connected the motor control line to the arduino's 5V supply)
even after powering the arduino from the motor driver circuit, manually touching the control lines to the arduino's power supply worked fine.
when i attached the USB to the arduino. immediately my mac shut down. i panicked and disconnected the entire setup.
a) when i power up the arduino by any means, the RX and TX lines are continuously on.
b) the lines do not blink even if i hold the reset button or manually grounding the reset pin.
b) my mac gives the following error.
USBF: 7412.280 The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 1 of Hub at 0x14000000)
USBF: 7416.640 The IOUSBFamily was not able to enumerate the device (Port 1 of Hub at 0x14000000).
i want to know if the board is damaged beyond recovery or is there anyway that i can fix it?