$2.$ Initialize the LED GPIOs to be Outputs

Next we will need to enable PB$-2$ as an output. This is done in the GPIOB MODER register, which can

be found described in section $8\mathrm{.}4\mathrm{.}1$ of the manual. This register has $16$ fields, each two bits wide. To set to

output, the corresponding field must be set to $01$ for MODER #$2.$ To do this you will first need to clear the

two bits to zero, then or in the value. So calculate the mask below, then the value to OR in$,$ first in binary

then in hex.

$4$

Register $313029282726252423222120191817161514131211109876543210$

MODER

MODER$15$

MODER$14$

MODER$13$

MODER$12$

MODER$11$

MODER$10$

MODER$9$

MODER$8$

MODER$7$

MODER$6$

MODER$5$

MODER$4$

MODER$3$

MODER$2$

MODER$1$

MODER$0$

Mask

Value

Mask in hex:$\_\_\_\_\_\_\_\_$ Value in hex: