1 files changed, 34 insertions, 0 deletions
diff --git a/octedit/octedit.s b/octedit/octedit.s
new file mode 100644
index 0000000..9445fd8
--- /dev/null
+++ b/octedit/octedit.s
@@ -0,0 +1,34 @@
+.syntax unified
+.cpu cortex-m0plus
+.thumb
+
+.equ SRAM_BASE, 0x20000000
+
+.type octedit, %function
+.global octedit
+
+octedit:
+  ldr r6, =SRAM_BASE
+  adds r5, r6, 1
+10:
+  movs r4, 0
+20:
+  bl uart_recv
+  cmp r0, '\r
+  beq 30f
+  cmp r0, 'G
+  beq 40f
+  bl uart_send
+  subs r0, '0
+  lsls r4, 3
+  adds r4, r0
+  b 20b
+30:
+  bl uart_send
+  movs r0, '\n
+  bl uart_send
+  strh r4, [r6]
+  adds r6, 2
+  b 10b
+40:
+  bx r5