i$)$ Configure the functions in the $.$C file below for USART$1.$

#include "uart.h$"$

void UART$\_$Init$()$

$\{$

$//$ Enabling Clock for GPIOB

RCC$->$AHB$1$ENR $|=(1$U $<<$ a$)\_\_\_\_\_\_\_)$;

$//$ Configuring RX and TX Pin

GPIOb$)\_\_\_\_\_\_\_->$ c$)\_\_\_\_\_\_\_\_|=(2$U $<<12$U$)|(2$U $<<14$U$)$; $//$ Setting Mode Alternate Function for PB$6$ and PB$7$

GPIOB$->$OSPEEDR $|=(3$U $<<12$U$)|(3$U $<<14$U$)$; $//$ Configuring speed High for PB$6$ and PB$7$

GPIOB$->$ d$)\_\_\_\_\_\_\_\_\_|=(7<<24$U$)|(7<<28$U$)$; $//$ Setting AF$7$ for PB$6$ and PB$7$

$//$ Enabling Clock for USART$1$

RCC$->$e$)\_\_\_\_\_\_\_\_\_|=(1<<$ f$)\_\_\_\_\_\_\_\_\_$ ;

$//$ Disabling UART for Configuring

g$)\_\_\_\_\_\_\_\_\_\_$ &$=$ ~$(1$U $<<13$U$)$;

$//$ Enabling TX & RX

USART$1->$CR$1|=$ h$)\_\_\_\_\_\_\_$ ;

Configuration continues............

i$)\_\_\_\_\_\_\_|=$ j$)\_\_\_\_\_\_\_$ ; $//$ Last step of configuring USART$1$

$\}$

void UART$\_$SendChar$($uint$8\_$t ch$)$

$\{$

while $(!($USART$1->$SR & $(1<<7)))$ ;

k$)\_\_\_\_\_\_\_\_\_\_\_=$ ch;

$\}$

uint$8\_$t UART$\_$ReceiveChar$()$

$\{$

while $(!($l$)\_\_\_\_\_\_\_\_\_\_\_\_$ & $(1<<5)))//$ holding Rx Buffer is not empty $///0=$ empty, $1=$ not empty

;

return USART$1->$DR;

$\}$

ii$)$ Short Questions $1$ x $4=4$

In UART$\_$SendChar$($uint$8\_$t ch$)$ function, why do we use the logic $(!($USART$1->$SR & $(1<<7)))$ for the while loop?

Ans.

Which bus is being used for USART$1?$ Which other USARTs could we use from that bus?

Ans.

What was the last step of configuring USART? Why is it necessary to write that command?

Ans.

Which alternate function are we using for this configuration? Name one other pair of TX$/$RX pins for USART$1$ from that alternate function that we could have used? $[$Use the alternate function table to answer$]$

Ans.