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Swapped D+/D- pins
Posted: Mon Jul 18, 2011 1:53 am
by jamesotron
Hi there.
On my latest set of prototype boards I accidentally flipped D+ and D- so that D- is connected to D2 and D+ is connected to D4! (This is an ATMega328p) - is it possible to work around the interrupt being on the wrong port in the software or should I get out the iron and try and fudge something together?
Re: Swapped D+/D- pins
Posted: Mon Jul 18, 2011 5:00 am
by ulao
Going to go out on a limb here an assume I'm missing the point. However if I'm not, my question to you... Why not switch the defines in the config.h ?
Assuming you use the default for most projects.
Code: Select all
#define USB_CFG_DMINUS_BIT 0
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
* This may be any bit in the port.
*/
#define USB_CFG_DPLUS_BIT 2
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
* This may be any bit in the port. Please note that D+ must also be connected
* to interrupt pin INT0!
to
Code: Select all
#define USB_CFG_DMINUS_BIT 2
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
* This may be any bit in the port.
*/
#define USB_CFG_DPLUS_BIT 0
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
* This may be any bit in the port. Please note that D+ must also be connected
* to interrupt pin INT0!
Re: Swapped D+/D- pins
Posted: Tue Jul 19, 2011 11:57 pm
by jamesotron
Right, except that the comments below say that D- must be connected to an INT0 port.
Re: Swapped D+/D- pins
Posted: Wed Jul 20, 2011 1:50 pm
by Micha