CS2771/assignments/alarm: Initial commit

1 files changed, 65 insertions, 0 deletions

diff --git a/alarm/alarm.asm b/alarm/alarm.asm
new file mode 100644
index 0000000..dd094ed
--- /dev/null
+++ b/alarm/alarm.asm
@@ -0,0 +1,65 @@
+;
+;30h-39h hold the 7seg bit patterns
+	mov	30h, #11000000B
+	mov	31h, #11111001B
+	mov 32h, #10100100B
+	mov	33h, #10110000B
+	mov 34h, #10011001B
+	mov	35h, #10010010B
+	mov 36h, #10000010B
+	mov 37h, #10000111B
+	mov 38h, #10000000B
+	mov 39h, #10011000B
+
+	mov 
+start:
+	
+	
+
+jmp start
+;40h-42h hold the 3 digits to display
+	
+display:
+	mov	acc, 50h
+	mov 	b,	#1000
+	div ab
+	mov 40h, acc
+	mov acc, b
+	mov	b, #100
+	div ab
+	mov	41h, acc; save 100's digit
+	mov	acc, b   ;put remainder in a
+	mov	b, #10  ;find 10's & 1's digit
+	div ab
+	mov	42h, acc  ;save 10's digit
+	mov	43h, b  ;save 1's digit
+
+
+
+;display:
+	mov	r1, #40h ;digits[0]
+
+loop:  ;for each digit
+	mov	acc, #30h
+	mov r3, acc  ;save acc;next blob:
+
+;safe if you don't care about the
+;bits of P3 other than p3.3 & p3.4
+	mov	a, r1    ;picks which
+	cpl a        ;7seg to use p3.3 &
+	anl	a, #03h  ;p3.4 are a func
+	rl	a        ;of the low2 bits of
+	rl	a        ;the addr where the
+	rl	a        ;digits live
+	mov	p1, #0ffh;undraw previous
+	mov	p3, a	 ;set new 7seg
+	mov	a, r3    ;restore acc
+
+; p1 = pattern[digit[i]] 
+	add	a, @r1
+	mov	r0, acc
+	mov	p1, @r0
+	inc	r1
+;	mov	p1, #0ffh
+	cjne	r1, #44h, loop
+	ret