Added Initial README and gitignore from earlier projects

.gitignore

+Debug
+Lab4-serial.elf.launch
+stm32f4_flash.ld
+.cproject
+.settings
+serial.elf.launch
+.project
+kuppe.elf
+kuppe.hex
+src/.main.c.swp

README.md

+Project base for STM32 Cortex MCUs
+----------------------------------
+
+Install arm-none-eabi-* series of tools
+
+[](https://www.archlinux.org/packages/community/x86_64/arm-none-eabi-gcc/)
+
+[](https://packages.debian.org/jessie/devel/gcc-arm-none-eabi)
+
+Install st-link
+
+[](https://github.com/texane/stlink)
+
+After cloning the project add code in:
+
+   src/main.c
+
+Compile with regular GNU make:
+
+   make
+
+Modify the Makefile and linker scripts to suit your requirements.
+
+Possibly change the memory size in stm32_linker.ld,
+included libraries in the Makefile.
+
+Connect your MCU and connect st-link.
+
+Sometimes it will complain it cannot find the chip, try erasing first:
+
+    st-flash --reset erase
+
+Then connect with st-util:
+
+    st-util 
+
+On my laptop some powermanagement settings interfere with longer debugging sessions,
+a workaround is to enable very verbose logging functioning as a keep-alive.
+
+    st-util -v99
+
+Launch your debugger with the compiled executable:
+
+    arm-none-eabi-gdb stm32f4.elf
+
+Useful regular GDB commands (which of most are possible to shorten to just the initial character):
+
+    continue
+    run
+    print
+    step
+
+Useful non-regular GDB commands:
+
+    reload
+
+This one is provided by the 
+
+    .gdbinit
+
+file included in this project. It will kill the current program and reload from the same file again.