added thumb assembler example, this is not part of an asm tutorial just

testing the new thumb assembler mods.

tas/blinker01.s

@@ -0,0 +1,44 @@
+
+.include armstart.s
+
+;configure gpio as an output
+    ldr r0,GPFSEL1
+    ldr r1,[r0]
+
+    ;ra&=~(7<<18);  zero bits 18,19,20
+    mov r2,#0x7
+    lsl r2,r2,#18
+    bic r1,r2
+    ;ra|=1<<18;     set bit 18
+    mov r2,#0x1
+    lsl r2,r2,#18
+    orr r1,r2
+    str r1,[r0]
+
+    ;prepare registers for loop
+    ldr r0,GPSET0
+    ldr r1,GPCLR0
+    mov r2,#1
+    lsl r3,r2,#16   ;(1<<16)
+    lsl r4,r2,#24   ;start count for counting loop
+top:
+    str r3,[r0]
+
+    mov r5,r4
+on:
+    sub r5,#1
+    bne on
+
+    str r3,[r1]
+
+    mov r5,r4
+off:
+    sub r5,#1
+    bne off
+
+    b top
+
+.align
+GPFSEL1: .word 0x20200004
+GPSET0:  .word 0x2020001C
+GPCLR0:  .word 0x20200028