/* --------------------------------------------------
   Define required labels for EGTAPI
   -------------------------------------------------- */
        .global main, Stop, CodeEnd
	.global DataStart, DataEnd

	.global x, y

/* --------------------------------------------------
   Begin of the program instructions
   -------------------------------------------------- */
	.text
main:
	// short x contains 254 = 0000000011111110
        movw    r0, #:lower16:x 	// Moves the address of memory
        movt    r0, #:upper16:x 	// variable x into register r0

	// Move short x into r1 using ldrsh (correct !)
	ldrsh	r1,[r0]		// r1 = 254, correct


	// Move short x into r2 using ldrsb (gets a wrong value !)
	ldrsb	r2,[r0]		// r2 = -2, WRONG VALUE !!
				// Can you explain why r2 contains -2 ?

	// Move short x into r3 using ldr (gets a wrong value !)
	ldr	r3,[r0]		// r2 = 65790 = 2^16 + 254,  WRONG VALUE !!
				// Can you explain why r2 contains 2^16 + 254 ?



Stop:
CodeEnd:
    	nop

/* --------------------------------------------------
   Begin of the permanent program variables
   -------------------------------------------------- */
	.data
DataStart:

x:	.2byte     254		// short typed variable
y:	.2byte     1		// short typed variable

DataEnd:

	.end