GPIO_DS_SEL1=1X
GPIO Drive Strength 1 Register. Each bit in this register selects the drive strength for the associated GPIO pin in this port. Refer to the Datasheet for sink/source current of GPIO pins in each mode. The total drive strength multiplier is the multiplication between the two drive strength select registers.
GPIO_DS_SEL1 | Mask of all of the pins on the port. 0 (1X): 1 x GPIO_DS_SEL0 = total drive strength multiplier. 1 (4X): 4 x GPIO_DS_SEL0 = total drive strength multiplier. |