Initial commit

2021-02-17 13:20:30 -08:00
commit 363944d417
35 changed files with 3318 additions and 0 deletions
--- a/uart/testtx.s
+++ b/uart/testtx.s
@@ -0,0 +1,42 @@
+start_:
+  set r0, main
+  or pc, r0, r0
+
+hello:
+  .word 0x4865
+  .word 0x6c6c
+  .word 0x6f2c
+  .word 0x2077
+  .word 0x6f72
+  .word 0x6c64
+  .word 0x2100
+
+uart_send:  // r0 is pointer to data, r1, length
+  set r2, 0
+  set r3, 0x10
+  seth r3, 0xc0
+  set r4, 1
+ loop0:
+  load r5, [r3, 2]
+  and r5, r5, r4
+  cmp r5, r2
+  beq loop0
+  load r5, [r0]
+  and r6, r0, r4
+  cmp r6, r4
+  beq [pc, 2]
+  shr r5, r5, 8
+  store r5, [r3]
+  add r0, r0, r4
+  sub r1, r1, r4
+  cmp r1, r2
+  bneq loop0
+  or pc, lr, lr
+
+main:
+  set r0, hello
+  set r1, 13
+  set r2, uart_send
+  set r3, main
+  or lr, r3, r3
+  or pc, r2, r2