Write UART interrupt driven assembly program that controls the LED brightness by capturing keys pressed on the keyboard. Every press of the $\text{'}+\text{'}$ key should increase brightness and every press of the $\text{'}-\text{'}$ key should decrease it$.$ Upon reaching minimum brightness further presses of the $"-"$ key should not modify it$.$ Similarly maximum brightness must be saturated. The space key should turn the LED off and on at the currently set brightness. The LED control must be implemented within the UART interrupt handler. Implement $32$ grades of brightness, generate PWM with period equal $10$ms by using TIMER$0$ and use $0$ as initial brightness level. Set initial brightness at $50\%.$

IN THIS FORMAT PLEASE:

INCLUDE EFR$32$BG$22.$inc ; CPU register definitions

INCLUDE terminal.inc ; terminal function definitions

EXPORT main

IMPORT LETIMER$\_$setup ; import names from other code files

IMPORT GPIO$\_$setup

;$-------------------------------------$ ; non$-$initialized DATA segment in RAM

AREA RAM, DATA, NOINIT, READWRITE, ALIGN$=3$

;myWord SPACE $4$ ; $32-$bit variable $($MUST BE ALIGHED!$)$

;myHalf SPACE $2$ ; $16-$bit variable $($MUST BE ALIGHED!$)$

;myByte SPACE $1$ ; $8-$bit variable $($NO alighment required$)$

;$-------------------------------------$ ; CODE segment in flash $($ROM$)$

AREA $|.$text$|,$ CODE, READONLY

main PROC ; main user code

bl Terminal$\_$setup ; setup TeraTerm communication

; bl GPIO$\_$setup ; configure port pins

; bl LETIMER$\_$setup ; start $1-$sec timer for periodic events

; your code starts here

loop ; periodic task starts here

b loop ; repeat periodic task

ENDP

;$-------------------------------------$

;prompt DCB "Enter a number: $",0$ ; allocate constant strings here

ALIGN

;constW DCD $15$ ; initialized $32-$bit constant

;constH DCW $23$ ; initialized $16-$bit constant

;constB DCB $17$ ; initialized $8-$bit constant

ALIGN

END