SparkFun Forums

[MontanaTrout]

Here is what I observed:
1. if you plug a wall charger then unit stop logging and start charging.
2. if you plug it to PC then the SD card dirver show on PC, stop logging.

I am new to ARM programming, anyone know which function it called after plug USB in?

Thanks!

[s3034585]

have a look at the usb boot loader source code.

Code: Select all

	if(IOPIN0 & (1<<23))			//Check to see if the USB cable is plugged in
	{
		main_msc();					//If so, run the USB device driver.
	}

it is checking whether the P0.23 pin is set high or not.
if you have a look at the schematic the net name is "USB_VBUS_DT"

probably this pin is not set hence your program will not proceeed and wont log anything..