From 4e018fc5bdd4ff9ee6065a5167fa291404e20576 Mon Sep 17 00:00:00 2001
From: Jacques Comeaux <jacquesrcomeaux@protonmail.com>
Date: Sat, 29 Jun 2024 10:22:54 -0500
Subject: Create UF2 header in Makefile

---
 octedit/Makefile | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

(limited to 'octedit/Makefile')

diff --git a/octedit/Makefile b/octedit/Makefile
index 4603ef4..74ce9d4 100644
--- a/octedit/Makefile
+++ b/octedit/Makefile
@@ -2,8 +2,21 @@ all: build
 
 build: octedit.uf2
 
-octedit.uf2: octedit.elf
-	../elf/elf2uf2 octedit.elf octedit.uf2
+octedit.uf2: octedit.bin
+	echo -ne "\x55\x46\x32\x0A" > octedit.uf2  # Magic 0
+	echo -ne "\x57\x51\x5D\x9E" >> octedit.uf2 # Magic 1
+	echo -ne "\x00\x20\x00\x00" >> octedit.uf2 # Flags
+	echo -ne "\x00\x00\x00\x10" >> octedit.uf2 # Load address
+	echo -ne "\x00\x01\x00\x00" >> octedit.uf2 # Data size
+	echo -ne "\x00\x00\x00\x00" >> octedit.uf2 # Block number
+	echo -ne "\x01\x00\x00\x00" >> octedit.uf2 # Number of blocks
+	echo -ne "\x56\xFF\x8B\xE4" >> octedit.uf2 # RP2040 family ID
+	cat octedit.bin >> octedit.uf2             # Data
+	printf %220s | tr " " "\0" >> octedit.uf2  # 0 padding
+	echo -ne "\x30\x6F\xB1\x0A" >> octedit.uf2 # Magic end
+
+octedit.bin: octedit.elf
+	arm-none-eabi-objcopy -O binary octedit.elf octedit.bin
 
 objects = setup.o octedit.o uart.o crc.o
 
@@ -15,7 +28,7 @@ $(objects): %.o: %.s
 	arm-none-eabi-as -o $@ $<
 
 clean:
-	rm octedit.elf octedit.uf2 *.o
+	rm octedit.elf octedit.bin octedit.uf2 *.o
 
 flash: octedit.uf2
 	[ -h /dev/disk/by-label/RPI-RP2 ] || sleep 3s
-- 
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