Fixed eggs and turning into tail

Made some changes to ensure that new eggs always spawn instantly.
Added checks to the part of the turning routine that prevents Snek from turning into her own body to allow Snek to turn towards her tail if she's not growing.

ASM/Egg/makeEgg.s

@@ -19,6 +19,7 @@ add	r0,#20
 strb	r0,[r1,#0x14]
 
 @choose a tile from the list
+rngFailsafe:
 ldr	r0,=rng
 mov	lr,r0
 .short	0xF800
@@ -31,6 +32,8 @@ swi	#6		@divide random number by length/2 +1
 lsl	r1,#1
 ldr	r3,=#0x02005000
 ldrh	r0,[r3,r1]
+cmp	r0,#0
+beq	rngFailsafe	@just in case
 
 @store coords
 ldr	r3,=#0x02000000

ASM/Snake/moveSnake.s

@@ -201,6 +201,9 @@ add	r0,#1
 strb	r2,[r4,r0]
 mov	r0,#0
 strh	r0,[r4,#0x1A]
+ldrh	r0,[r4,#0x16]
+sub	r0,#1
+strh	r0,[r4,#0x16]
 b	End
 
 End:

ASM/Snake/turnSnake.s

@@ -1,12 +1,13 @@
 .thumb
 
 push	{lr}
+push	{r4-r7}
 ldr	r1,=#0x02000000
 
 @check game over
 ldrb	r0,[r1,#0xD]
 cmp	r0,#0xF0
-bhi	End
+bhi	EndTrampolin
 
 @get button presses
 ldrb	r0,[r1,#5]
@@ -53,7 +54,7 @@ beq	store
 mov	r3,#3
 cmp	r0,#0x10
 beq	store
-b	End
+b	EndTrampolin
 
 store:
 @one final check, check if the snake is going to be turning towards the screen
@@ -68,7 +69,25 @@ ldrb	r2,[r2,#1]
 cmp	r0,#0x10
 bne	notright
 cmp	r1,#0x1D
-beq	End
+beq	EndTrampolin
+@check if turning towards tail and not growing
+ldr	r4,=#0x02000000
+ldrh	r5,[r4,#0xE]
+ldrh	r6,[r4]
+cmp	r5,r6
+bne	growing1
+ldrh	r5,[r4,#0x20]
+ldrh	r6,[r4]
+lsl	r6,#1
+add	r6,#0x20
+sub	r6,#2
+ldrh	r6,[r4,r6]
+mov	r7,#0x1
+add	r6,r7
+cmp	r6,r5
+bne	growing1
+b	notright
+growing1:
 @check if bonk
 push	{r0-r3}
 ldr	r3,=bonkSnake
@@ -90,7 +109,26 @@ notright:
 cmp	r0,#0x20
 bne	notleft
 cmp	r1,#0
-beq	End
+beq	EndTrampolin
+
+@check if turning towards tail and not growing
+ldr	r4,=#0x02000000
+ldrh	r5,[r4,#0xE]
+ldrh	r6,[r4]
+cmp	r5,r6
+bne	growing2
+ldrh	r5,[r4,#0x20]
+ldrh	r6,[r4]
+lsl	r6,#1
+add	r6,#0x20
+sub	r6,#2
+ldrh	r6,[r4,r6]
+mov	r7,#0x1
+sub	r6,r7
+cmp	r6,r5
+bne	growing2
+b	notleft
+growing2:
 @check if bonk
 push	{r0-r3}
 ldr	r3,=bonkSnake
@@ -108,11 +146,37 @@ sub	r0,#1
 cmp	r0,#1
 beq	turnBonk
 pop	{r0-r3}
+
+b	noTrampolin
+EndTrampolin:
+b	End
+noTrampolin:
+
 notleft:
 cmp	r0,#0x40
 bne	notup
 cmp	r2,#2
 beq	End
+
+@check if turning towards tail and not growing
+ldr	r4,=#0x02000000
+ldrh	r5,[r4,#0xE]
+ldrh	r6,[r4]
+cmp	r5,r6
+bne	growing3
+ldrh	r5,[r4,#0x20]
+ldrh	r6,[r4]
+lsl	r6,#1
+add	r6,#0x20
+sub	r6,#2
+ldrh	r6,[r4,r6]
+ldr	r7,=#0x100
+sub	r6,r7
+cmp	r6,r5
+bne	growing3
+b	notup
+growing3:
+
 @check if bonk
 push	{r0-r3}
 ldr	r3,=bonkSnake
@@ -135,6 +199,26 @@ cmp	r0,#0x80
 bne	notdown
 cmp	r2,#0x13
 beq	End
+
+@check if turning towards tail and not growing
+ldr	r4,=#0x02000000
+ldrh	r5,[r4,#0xE]
+ldrh	r6,[r4]
+cmp	r5,r6
+bne	growing4
+ldrh	r5,[r4,#0x20]
+ldrh	r6,[r4]
+lsl	r6,#1
+add	r6,#0x20
+sub	r6,#2
+ldrh	r6,[r4,r6]
+ldr	r7,=#0x100
+add	r6,r7
+cmp	r6,r5
+bne	growing4
+b	notdown
+growing4:
+
 @check if bonk
 push	{r0-r3}
 ldr	r3,=bonkSnake
@@ -160,6 +244,7 @@ End:
 ldr	r0,=#0x02000000	@clear button presses
 mov	r1,#0		@this is to stop the infinite zig-zag the snake does if you hold up/down and left/right and release
 strb	r1,[r0,#5]	@zig-zag can still be performed by holding down both keys, if you really really want to do that
+pop	{r4-r7}
 pop	{r0}
 bx	r0