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how to control drive strength for cc2538

im trying to find/figure out how or if:

1) the drive strength can be changed on a pin

2) the pull strength paraeter can be controlled.

anyone know how or which data sheet i could look in. i've been trying to find an answer but have no luck. all i know is 4 of the 32 pins are 20mA capable and 28 are 4mA. but not sure if they are preset to that or if they have to be changed or even can be changed.