I have an HC-SR04 ultrasonic sensor and a TM4C123G launchpad. I need to make a project using Keil-Uvision 5 using Arm assembly programming language. I need to measure the distance with the sensor. The trigg part of the sensor is connected to PD0, and the echo part is connected to PD1. I need the GPIO connection parts to be completed for the code I wrote to run this system.

The code I wrote:

. data distance: .word 0 @ variable to store distance in mm .text .global main main: mov r0, \#17 (@ set GPIO Port D pin 0 (PDO) as output mov r1, \#1 str r1,[r0] mov r,\#0 @ initialize loop counter loop: mov r1, \#1 @set PD0high str r1, [rO] mov 2 , \#0 @ delay for10us delay: add r2,r2,#1 cmp r2,\#200 blo delay mov r1, \#0 @ setPDOlow str r1,[rO] mov r0, \#16 @ set GPIO Port D pin 1 (PD1) as input mov r1, \#0 str r1,[r0] mov r0, \#18 @read PD1 ldr r1, [r0] cmp r1, \#0 @ wait for PD1 to go high beq loop mov r2, \#0 (a)reset timer timer: add r2,r2,\#1 @ increment timer cmp r2,\#60000@@ check if timer has reached 60,000 blo timer @ if not, keep waiting mov r0, \#16 @ set PD1 as output mov r1, \#1 str r1, [rO] mov r1, \#0 @ setPD1low str r1,[r0] Idr ro, =distance @ load address of distance into ro str 2 , [rO] @ store timervalue in distance mov r0, \#0 @ set return value to 0 (success) bx r @return