write code in C for same system.:

(a) use condition

(b) use shift operation

(CODE)

; GPIO.s

; Runs on LM4F120 and TM4C123

; Implements a NOT gate described in class

; PD3 is an output to LED, Positive logic

; PD0 is an input from switch, Positive logic

; Switch pressed causes LED to go OFF and

; release causes LED to go ON.

; **** To run this example in Simulator

; make sure and copy the C0DLL.dll file

;(in the folder where this [GPIO.s]file is)

; to your Keil ARM/Bin folder;

;; Note that running the simulator gives 4 warnings

;; Click OK and continue

GPIO_PORTD_DATA_R EQU 0x400073FC

GPIO_PORTD_DIR_R EQU 0x40007400

GPIO_PORTD_AFSEL_R EQU 0x40007420

GPIO_PORTD_DEN_R EQU 0x4000751C

SYSCTL_RCGCGPIO_R EQU 0x400FE608

AREA |.text|, CODE, READONLY, ALIGN=2

THUMB

EXPORT Start

GPIO_Init

; 1) activate clock for Port D

LDR R1, =SYSCTL_RCGCGPIO_R

LDR R0, [R1] ; R0 = [R1]

ORR R0, R0, #0x08 ; R0 = R0|0x08

STR R0, [R1] ; [R1] = R0

NOP

NOP

NOP

NOP ; allow time to finish activating

; 3) set direction register

LDR R1, =GPIO_PORTD_DIR_R ; R1 = &GPIO_PORTD_DIR_R

LDR R0, [R1] ; R0 = [R1]

ORR R0, R0, #0x08 ; R0 = R0|0x08 (make PD3 output)

;BIC R0, R0, #0x01 ; R0 = R0 & NOT(0x01) (make PD0 input)

STR R0, [R1] ; [R1] = R0

; 4) regular port function

LDR R1, =GPIO_PORTD_AFSEL_R ; R1 = &GPIO_PORTD_AFSEL_R

LDR R0, [R1] ; R0 = [R1]

BIC R0, R0, #0x09 ; R0 = R0&~0x09 (disable alt funct on PD3,PD0)

STR R0, [R1] ; [R1] = R0

; 5) enable digital port

LDR R1, =GPIO_PORTD_DEN_R ; R1 = &GPIO_PORTD_DEN_R

LDR R0, [R1] ; R0 = [R1]

ORR R0, R0, #0x09 ; R0 = R0|0x09 (enable digital I/O on PD3,PD0)

STR R0, [R1] ; [R1] = R0

BX LR

Start

BL GPIO_Init

LDR R0, =GPIO_PORTD_DATA_R

loop

LDR R1,[R0]

ORR R1, #0x00 ;

STR R1,[R0] ; Write to PortD DATA register to update LED on PD3

B loop ; unconditional branch to 'loop'

ALIGN ; make sure the end of this section is aligned

END ; end of file