From 261c210c9c4c1e55103a7af31dfcc539c0e0e5cc Mon Sep 17 00:00:00 2001
From: Jacques Comeaux <jacquesrcomeaux@protonmail.com>
Date: Fri, 19 Jan 2024 16:41:29 -0600
Subject: Add subroutine for printing hexadecimal word

---
 hexedit/hexedit.s | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 hexedit/hexedit.s

(limited to 'hexedit/hexedit.s')

diff --git a/hexedit/hexedit.s b/hexedit/hexedit.s
new file mode 100644
index 0000000..0bc03a9
--- /dev/null
+++ b/hexedit/hexedit.s
@@ -0,0 +1,25 @@
+.syntax unified
+.cpu cortex-m0plus
+.thumb
+
+.type hexedit, %function
+.global hexedit
+
+hexedit:
+  ldr r2, =0x20000100
+  movs r1, 0
+getchar:
+  bl uart_recv
+  cmp r0, 'g
+  beq stop
+  subs r0, '0 // The ASCII char '0'
+  bmi next
+  lsls r1, 4
+  adds r1, r0
+  b getchar
+next:
+  ldr r0, [r2, 0]
+  adds r2, 4
+  b hexedit
+stop:
+  b 0x20000100
-- 
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