A simple H bridge where the positive side has current sensing and control
Notice the motor is stopped because that is the situation where the current is at maximum and the motor acts like a very low resistance. The circuit doesn't allow the current to go much higher than ~10A
Notice i did not add flyback diodes so as to not clutter the design, but they would be necessary in a real application
Update: replaced the motor with a 1mOhm resistor.