From 5bbad5026cb810f61c2466d5c4bf3438ba820842 Mon Sep 17 00:00:00 2001
From: Jacques Comeaux <jacquesrcomeaux@protonmail.com>
Date: Sun, 26 May 2024 14:21:59 -0500
Subject: Finish hexedit and update README

---
 hexedit/hexedit.s | 42 ++++++++++++++++++++++++++----------------
 1 file changed, 26 insertions(+), 16 deletions(-)

(limited to 'hexedit/hexedit.s')

diff --git a/hexedit/hexedit.s b/hexedit/hexedit.s
index 0bc03a9..26bc84b 100644
--- a/hexedit/hexedit.s
+++ b/hexedit/hexedit.s
@@ -2,24 +2,34 @@
 .cpu cortex-m0plus
 .thumb
 
+.equ SRAM_BASE, 0x20000000
+
 .type hexedit, %function
 .global hexedit
 
 hexedit:
-  ldr r2, =0x20000100
-  movs r1, 0
-getchar:
+  ldr r6, =SRAM_BASE
+  adds r5, r6, 1
+10:
+  movs r4, 0
+20:
   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
+  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:
+  movs r0, '\r
+  bl uart_send
+  movs r0, '\n
+  bl uart_send
+  strh r4, [r6]
+  adds r6, 2
+  b 10b
+40:
+  bx r5
-- 
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