commit 8053d96def0c412152ce073768f40cb846761d37
Author: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date:   Sat Apr 16 22:37:03 2022 +0300

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7cf238f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+*.elf
+*.bin
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1a7e319
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+debug:
+	openocd -f interface/stlink.cfg -f target/stm32f4x.cfg
+
+all:
+	arm-none-eabi-gcc -x assembler-with-cpp -c -O0 -mcpu=cortex-m0 -mthumb -Wall core.S -o core.o
+	arm-none-eabi-gcc core.o -mcpu=cortex-m0 -mthumb -Wall -nostdlib -lgcc -T./linker.ld -o main.elf
+	arm-none-eabi-objcopy -O binary main.elf main.bin
\ No newline at end of file
diff --git a/core.S b/core.S
new file mode 100644
index 0000000..c667f8d
--- /dev/null
+++ b/core.S
@@ -0,0 +1,25 @@
+.syntax unified
+.cpu cortex-m0
+.fpu softvfp
+.thumb
+
+.global vtable
+.global reset_handler
+
+.type vtable, %object
+vtable:
+    .word _estack
+    .word reset_handler
+.size vtable, .-vtable
+
+.type reset_handler, %function
+reset_handler:
+  LDR  r0, =_estack
+  MOV  sp, r0
+
+  LDR  r7, =0xDEADBEEF
+  MOVS r0, #0
+  main_loop:
+    ADDS r0, r0, #1
+    B    main_loop
+.size reset_handler, .-reset_handler
diff --git a/linker.ld b/linker.ld
new file mode 100644
index 0000000..bf67748
--- /dev/null
+++ b/linker.ld
@@ -0,0 +1,7 @@
+_estack = 0x20001000;
+
+MEMORY
+{
+    FLASH ( rx )      : ORIGIN = 0x08000000, LENGTH = 1024K
+    RAM ( rxw )       : ORIGIN = 0x20000000, LENGTH = 256K
+}
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