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Custom Buzzer Question for cc2540

I am trying to make a push-pull circuit to drive a couple transistors, but cannot seem to create a timing compare scheme on two pins to run 180deg out of phase with one another.  Has anyone done this?

Also since the I/O (besides P1.0 and P1.1) can only drive 4mA, could I tie two outputs together to double the current drive to a piezo? 

Thanks