Shakeout of makefiles and Kconfigs

19 files changed, 542 insertions, 626 deletions

diff --git a/Kconfig b/Kconfig
index 5101d01..7330c85 100644
--- a/Kconfig
+++ b/Kconfig
@@ -1,280 +1,3 @@
-mainmenu "AVR-IOE configuration"
+mainmenu "AVR-IOE library configuration"
 
-config IOEROOT
-	string
-	option env="IOEROOT"
-source "$IOEROOT/include/mcu/Kconfig"
-
-config F_CPU
-	int "CPU frequency in kHz (F_CPU)"
-	default 16000
-	---help---
-	Frequency CPU is running on. This must be value in kHz.
-
-# Toolchain #####################################################################
-
-menu "Compilation options"
-
-config CHOST
-	string "AVR Compilation toolchain prefix (host)"
-	default "avr-"
-	---help---
-	Prefix used for all calls to compilation toolchain when compiling for AVR.
-
-config CCFLAGS
-	string "AVR compilation flags"
-	default "-Os -ffunction-sections -fdata-sections -fshort-enums -Wall"
-	---help---
-	C compilation flags for AVR host. Its suggested to not remove defaults unless
-	you know what they do.
-
-config CLDFLAGS
-	string "AVR linking flags"
-	default ""
-	---help---
-	C linking flags for AVR host.
-
-config CBUILD
-	string "Building machine compilation toolchain prefix (build)"
-	default ""
-	---help---
-	Prefix used for all calls to compilation toolchain when compiling applications
-	used for compilation or testing.
-
-config BUILD_CFLAGS
-	string "Bulding machine compilation flags"
-	default "-Wall"
-	---help---
-	C compilation flags for build.
-
-config BUILD_LDFLAGS
-	string "Building machine linking flags"
-	default ""
-	---help---
-	C linking flags for build.
-
-endmenu
-
-# Error handling ################################################################
-
-config CONFIG_ERRORS
-	bool "Errors support"
-	default y
-	---help---
-	This enables error handling. This enables some checks and allows both avr-ioe
-	and you program to react on errors. This doesn't handless hardware errors,
-	only software ones.
-
-if CONFIG_ERRORS
-
-menu "Errors handling"
-
-config CONFIG_EH_RESTART
-	bool "Restart MCU on error detection"
-	default n
-	---help---
-	CPU is restarted when error is detected. This is suggested in production.
-
-config CONFIG_EH_HANG
-	bool "Hang execution until manual restart on error detection"
-	default n
-	---help---
-	Program hangs execution when error is detected. This is suggested in
-	development.
-
-config CONFIG_EH_LED
-	bool "Signal error detection by LED"
-	depends on CONFIG_IOPORTS
-	default n
-	---help---
-	When error is detected, specified output is pulled up. This is handy with
-	CONFIG_EH_HANG. If you use this with CONFIG_EH_RESTART you will probably
-	miss led blink.
-
-config CONFIG_EH_LED_IOPIN
-	string "Error detection led output pin"
-	depends on CONFIG_EH_LED
-	default "IO_B0"
-	---help---
-	Specifies IO pin which will be pulled up on error detection.
-	This string should be valid IO port (for example "IO_B0") or pair of group
-	mask divided by comma (for example "IO_B, _BV(0)").
-
-endmenu
-
-config CONFIG_ERROR_MESSAGES
-	bool "Build with error messages"
-	default n
-	---help---
-	If errors should support messages. Compiling error messages to code can be
-	handy to finding out errors, but also makes program unnecessary big.
-
-config CONFIG_ERROR_CALLBACK
-	bool "User program implements callback to be used to optionally resolve error"
-	default n
-	---help---
-	This allows user program to define error callback to be called just after
-	error is detected. This also can suppress error, but that is dangerous and
-	should be used only with deep understanding of what it means.
-
-config CONFIG_CHECK_ARGUMENTS
-	bool "Check arguments for all functions in library"
-	default n
-	---help---
-	If arguments passed to functions in library should be checked and
-	possibly error should be risen.
-
-endif
-
-# IO Ports ######################################################################
-
-config MCUSUPPORT_IOPORTS
-	bool
-	default n
-
-config CONFIG_IOPORTS
-	bool "Input/Output ports"
-	default y
-	depends on MCUSUPPORT_IOPORTS
-
-config MCUSUPPORT_PCINT0
-	bool
-	default n
-config MCUSUPPORT_PCINT1
-	bool
-	default n
-config MCUSUPPORT_PCINT2
-	bool
-	default n
-
-config CONFIG_IOPORTS_PCINT
-	bool "Input/Output ports change interrupts"
-	depends on CONFIG_IOPORTS
-	depends on MCUSUPPORT_PCINT0 || MCUSUPPORT_PCINT1 || MCUSUPPORT_PCINT2
-
-# SPI ###########################################################################
-
-config MCUSUPPORT_SPI
-	bool
-	default n
-
-config CONFIG_SPI
-	bool "SPI (Serial peripheral interface)"
-	depends on MCUSUPPORT_SPI
-
-# USART #########################################################################
-config MCUSUPPORT_USART
-	bool
-	default n
-
-menuconfig CONFIG_USART
-	bool "USART (Universal synchronous/asynchronous transceiver)"
-	depends on MCUSUPPORT_USART
-
-if CONFIG_USART
-
-config CONFIG_USART_BAUD
-	int "Baudrate"
-	default 115200
-
-choice USART_PARITY_C
-	prompt "Parity"
-config USART_PARITY_C_NONE
-	bool "None"
-config USART_PARITY_C_ODD
-	bool "Odd"
-config USART_PARITY_C_EVEN
-	bool "Even"
-endchoice
-config CONFIG_USART_PARITY
-	string
-	default "USART_PARITY_NONE" if USART_PARITY_C_NONE
-	default "USART_PARITY_ODD" if USART_PARITY_C_ODD
-	default "USART_PARITY_EVEN" if USART_PARITY_C_EVEN
-
-config CONFIG_USART_DATABITS
-	int "Data bits"
-	default 8
-	range 5 8
-
-choice USART_STOPBIT_C
-	prompt "Stop bit"
-config USART_STOPBIT_C_SINGLE
-	bool "Single"
-config USART_STOPBIT_C_DOUBLE
-	bool "Double"
-endchoice
-config CONFIG_USART_STOPBIT
-	string
-	default "USART_STOPBIT_SINGLE" if USART_STOPBIT_C_SINGLE
-	default "USART_STOPBIT_DOUBLE" if USART_STOPBIT_C_DOUBLE
-
-config CONFIG_USART_OUTPUT_BUFFER
-	bool "Use output buffer"
-	default n
-
-config CONFIG_USART_OUTBUFFER_SIZE
-	int "Output buffer size in bytes." if CONFIG_USART_OUTPUT_BUFFER
-	default 0 if ! CONFIG_USART_OUTPUT_BUFFER
-	range 1 512000 if CONFIG_USART_OUTPUT_BUFFER
-	default 32
-
-choice USART_OUTBUFFER_MODE_C
-	prompt "Output buffer replacement policy" if CONFIG_USART_OUTPUT_BUFFER
-config USART_OUTBUFFER_MODE_C_BLOCK
-	bool "Block"
-config USART_OUTBUFFER_MODE_C_OVERWRITE
-	bool "Overwrite"
-config USART_OUTBUFFER_MODE_C_DROP
-	bool "Drop"
-config USART_OUTBUFFER_MODE_C_ERROR
-	depends  on CONFIG_ERRORS
-	bool "Error"
-endchoice
-config CONFIG_USART_OUTBUFFER_MODE
-	int
-	default 1 if USART_OUTBUFFER_MODE_C_OVERWRITE
-	default 2 if USART_OUTBUFFER_MODE_C_DROP
-	default 0
-
-config CONFIG_USART_INPUT_BUFFER
-	bool "Use input buffer"
-
-config CONFIG_USART_INBUFFER_SIZE
-	int "Input buffer size in bytes." if CONFIG_USART_INPUT_BUFFER
-	default 0 if ! CONFIG_USART_INPUT_BUFFER
-	range 1 512000 if CONFIG_USART_INPUT_BUFFER
-	default 32
-
-choice USART_INBUFFER_MODE_C
-	prompt "Input buffer replacement policy" if CONFIG_USART_INPUT_BUFFER
-config USART_INBUFFER_MODE_C_BLOCK
-	bool "Block"
-config USART_INBUFFER_MODE_C_OVERWRITE
-	bool "Overwrite"
-config USART_INBUFFER_MODE_C_DROP
-	bool "Drop"
-config USART_INBUFFER_MODE_C_ERROR
-	depends  on CONFIG_ERRORS
-	bool "Error"
-endchoice
-config CONFIG_USART_INBUFFER_MODE
-	int
-	default 1 if USART_INBUFFER_MODE_C_OVERWRITE
-	default 2 if USART_INBUFFER_MODE_C_DROP
-	default 0
-
-config CONFIG_USART_OUTFILE
-	bool "STD FILE support for output"
-	depends on CONFIG_USART_OUTPUT_BUFFER
-
-config CONFIG_USART_INFILE
-	bool "STD FILE support for input"
-	depends on CONFIG_USART_INPUT_BUFFER
-
-endif
-
-# Timers ########################################################################
-
-config CONFIG_TIMERS
-	bool "Timers"
+source ioe.Kconfig
diff --git a/Makefile b/Makefile
index 13d281b..ea96319 100644
--- a/Makefile
+++ b/Makefile
@@ -24,19 +24,7 @@ ifeq (,$(filter clean help docs serve-docs clean-docs config oldconfig \
 	$(MAKECMDGOALS))) # Ignore build targets if goal is not building
 
 include $(CONFIG) # include configuration
-
-### Source files list ###########################
-SRC = base.c
-ifeq (y,$(CONFIG_IOPORTS))
-SRC += ioport.c
-endif
-ifeq (y,$(CONFIG_SPI))
-SRC += spi.c
-endif
-ifeq (y,$(CONFIG_USART))
-SRC += usart.c
-endif
-### End of source files list ####################
+include src/sources.mk
 
 OBJ = $(patsubst %.c,$(O)/build/%.o,$(SRC))
 DEP = $(patsubst %.c,$(O)/build/%.d,$(SRC))
@@ -102,52 +90,20 @@ clean-docs:
 .PHONY: proper
 proper: clean clean-docs
 	@echo " CLEAN CONFIG"
-	$(Q)$(RM) $(CONFIG) $(CONFIG).orig
+	$(Q)$(RM) $(CONFIG) $(CONFIG).orig .config.cmd
 
 .PHONY: help
 help:
 	@echo  "all/libioe.a - Build library"
 	@echo  "config       - Start configuration program"
-	@echo  "menuconfig   - NCurses based configuration program"
+	@echo  "menuconfig   - NCurses based configuration program (Kconfig)"
 	@echo  "docs         - Build documentation"
 	@echo  "server-docs  - Start temporally http server with documentation"
 	@echo  "help         - Prints this text"
 	@echo  "clean        - Removing all object files generated from source files"
 	@echo  "clean-docs   - Remove generated documentation"
+	@echo  "proper       - Cleans everything including configuration"
 
-$(CONFIG):
-	@echo Please generate configuration first using config or menuconfig target
-	@exit 1
-
-# We don't wont pass any variable to Kconfig. This is workaround for that.
-MAKEOVERRIDES =
-
-callconfig = $(Q)\
-	[ ! -f "$(CONFIG)" ] || mv "$(CONFIG)" config; \
-	IOEROOT=. $(MAKE) -f tools/kconfig/GNUmakefile --no-print-directory \
-		TOPDIR=. SRCDIR=tools/kconfig $(1); \
-	[ ! -f config ] || mv config "$(CONFIG)"; \
-	[ ! -f config.old ] || mv config.old "$(CONFIG).old"
-# Note about this file moving madness:
-# avr-ioe is using Kconfig for configuration and it is not prepared too well for
-# nested projects (at least I don't know way). This unfortunately means that to
-# have configuration in parent project, We have to move it every time we are
-# generating it. Also upper projects can't use Kconfig for its self configuration.
-
--include .config.cmd
-
-.PHONY: oldconfig
-oldconfig: $(deps_config)
-	$(call callconfig, oldconfig)
-
-.PHONY: config
-config: $(deps_config)
-	$(call callconfig, config)
-
-.PHONY: menuconfig
-menuconfig: $(deps_config)
-	$(call callconfig, menuconfig)
-
-.PHONY: allyesconfig
-allyesconfig: $(deps_config)
-	$(call callconfig, allyesconfig)
+TOOL_PATH=tools
+IOEROOT=.
+include tools/kconfig.mk
diff --git a/docs/references/ioport.md b/docs/references/ioport.md
index 96a4b82..1f4b511 100644
--- a/docs/references/ioport.md
+++ b/docs/references/ioport.md
@@ -33,9 +33,9 @@ Parameters:
 __group__ - Character specifying exact port group  
 __mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
 
-#### Function io_hight
+#### Function io_high
 ```C
-static inline void io_hight(uint8_t group, uint8_t mask)
+static inline void io_high(uint8_t group, uint8_t mask)
 ```
 Sets output port to hight (also can be called as 1).  
 WARNING: Invoke this only if io_setout is called before.
diff --git a/examples/blink/.config b/examples/blink/.config
deleted file mode 100644
index 9023cfc..0000000
--- a/examples/blink/.config
+++ /dev/null
@@ -1,27 +0,0 @@
-#
-# Automatically generated file; DO NOT EDIT.
-# AVR-IOE configuration
-#
-MMCU="atmega328p"
-ATMEGA328P=y
-# ATTINY85 is not set
-# ATTINY4313 is not set
-F_CPU=16000
-
-#
-# Compilation options
-#
-GNUTOOLCHAIN_PREFIX="avr-"
-CONFCFLAGS="-Os -ffunction-sections -fdata-sections -fshort-enums -Wall"
-# CONFIG_ERRORS is not set
-MCUSUPPORT_IOPORTS=y
-CONFIG_IOPORTS=y
-MCUSUPPORT_PCINT0=y
-MCUSUPPORT_PCINT1=y
-MCUSUPPORT_PCINT2=y
-# CONFIG_IOPORTS_PCINT is not set
-MCUSUPPORT_SPI=y
-# CONFIG_SPI is not set
-MCUSUPPORT_USART=y
-# CONFIG_USART is not set
-# CONFIG_TIMERS is not set
diff --git a/examples/blink/Kconfig b/examples/blink/Kconfig
new file mode 100644
index 0000000..9c3a502
--- /dev/null
+++ b/examples/blink/Kconfig
@@ -0,0 +1,9 @@
+mainmenu "AVR-IOE blink configuration"
+
+# We need CONFIG_IOPORTS, but we don't care about anything else.
+config BLINK_DEFAULTS
+	bool
+	default y
+	select CONFIG_IOPORTS
+
+source "../../ioe.Kconfig"
diff --git a/examples/blink/Makefile b/examples/blink/Makefile
index f2cc133..c70ed33 100644
--- a/examples/blink/Makefile
+++ b/examples/blink/Makefile
@@ -1,69 +1,4 @@
-MAKEFLAGS += --no-builtin-rules
-PROJNAME = blink
-
+EXAMPLE_NAME = blink
 SRC = blink.c
 
-OBJ = $(patsubst %.c,%.o,$(SRC)) # This creates list of *.o files from *.c
-Q ?= @ # This can be overwritten to show commands
-
-.PHONY: all
-ifneq ("$(wildcard .config)","") # Checking if configuration exists
-all: $(PROJNAME).hex
-	@echo Now you can flash $< to your chip.
-else
-all: .config
-endif
-
-# Edit here help like you ever want
-.PHONY: help
-help:
-	@echo  "AVR-IOE blink example"
-	@echo  " all         - Build example"
-	@echo  " config      - Start configuration program"
-	@echo  " menuconfig  - NCurses based configuration program"
-	@echo  " help        - Prints this text"
-	@echo  " clean       - Removing all object files generated from source files"
-
-.PHONY: clean
-clean:
-	@echo " CLEAN OBJ"
-	$(Q)$(RM) $(OBJ)
-	@echo " CLEAN $(PROJNAME).elf $(PROJNAME).hex"
-	$(Q)$(RM) $(PROJNAME).elf $(PROJNAME).hex
-	$(Q)$(MAKE) -C ../.. clean O=examples/$(PROJNAME)
-
-# Building targets are available only if configuration is generated
-ifneq ("$(wildcard .config)","")
--include .config
-# If you want change some standard CFLAGS, change them in configuration not here.
-# Add here only options that should not be applied to avr-ioe also.
-CFLAGS = -I../../include -mmcu=$(MMCU) -imacros build/config.h \
-	 $(shell echo $(CONFCFLAGS)) $(shell echo -DF_CPU=$(F_CPU)000L)
-
-$(PROJNAME).elf: libioe.a
-$(PROJNAME).elf: $(OBJ)
-	@echo " LD       $@"
-	$(Q)avr-gcc -Os -mmcu=$(MMCU) $(filter %.o,$^) -o $@ -L. -lioe
-
-$(PROJNAME).hex: $(PROJNAME).elf
-	@echo " OBJCOPY  $@"
-	$(Q)avr-objcopy -O ihex -R .eeprom $< $@
-
-$(OBJ): %.o: %.c libioe.a
-	@echo " CC       $@"
-	$(Q)avr-gcc $(CFLAGS) -c -o $@ $<
-
-libioe.a: .config
-	$(Q)$(MAKE) -C ../.. examples/$(PROJNAME)/libioe.a O=examples/$(PROJNAME)
-endif
-
-.config:
-	@echo Configuration for this example is missing. Probably deleted...
-	@exit 1
-
-config:
-	$(Q)$(MAKE) -C ../.. config O=examples/$(PROJNAME)
-
-.PHONY: menuconfig
-menuconfig:
-	$(Q)$(MAKE) -C ../.. menuconfig O=examples/$(PROJNAME)
+include ../examples.mk
diff --git a/examples/blink/blink.c b/examples/blink/blink.c
index 912ce80..a1411e6 100644
--- a/examples/blink/blink.c
+++ b/examples/blink/blink.c
@@ -6,7 +6,7 @@ int main() {
 	io_setout(IO_B0);
 
 	while (1) {
-		io_hight(IO_B0);
+		io_high(IO_B0);
 		_delay_ms(500);
 		io_low(IO_B0);
 		_delay_ms(500);
diff --git a/examples/examples.mk b/examples/examples.mk
new file mode 100644
index 0000000..f6b0acb
--- /dev/null
+++ b/examples/examples.mk
@@ -0,0 +1,74 @@
+# vim:ts=4:sw=4:sts=4:noexpandtab
+MAKEFLAGS += --no-builtin-rules
+# Note this file is included to Makefiles in lower directories so all paths here
+# are like thy would be from lower directory.
+
+# You have to define EXAMPLE_NAME variable
+ifndef EXAMPLE_NAME
+$(error Before including examples.mk define EXAMPLE_NAME)
+endif
+ifndef SRC
+$(error Before including examples.mk define SRC)
+endif
+
+OBJ = $(patsubst %.c,%.o,$(SRC)) # This creates list of *.o files from *.c
+Q ?= @ # This can be overwritten to show commands
+
+CONFIG = .config
+
+.PHONY: all
+ifneq ("$(wildcard $(CONFIG))","") # Checking if configuration exists
+all: $(EXAMPLE_NAME).hex
+	@echo Now you can flash $< to your chip.
+else
+all: $(CONFIG)
+endif
+
+# Edit here help like you ever want
+.PHONY: help
+help:
+	@echo  "AVR-IOE $(EXAMPLE_NAME) example"
+	@echo  " all         - Build example"
+	@echo  " config      - Start configuration program"
+	@echo  " menuconfig  - NCurses based configuration program"
+	@echo  " help        - Prints this text"
+	@echo  " clean       - Removing all object files generated from source files"
+
+.PHONY: clean
+clean:
+	@echo " CLEAN OBJ"
+	$(Q)$(RM) $(OBJ)
+	@echo " CLEAN $(EXAMPLE_NAME).elf $(EXAMPLE_NAME).hex"
+	$(Q)$(RM) $(EXAMPLE_NAME).elf $(EXAMPLE_NAME).hex
+	$(Q)$(MAKE) -C ../.. clean O=examples/$(EXAMPLE_NAME)
+
+# Building targets are available only if configuration is generated
+ifneq ("$(wildcard $(CONFIG))","")
+-include $(CONFIG)
+# If you want change some standard CFLAGS, change them in configuration not here.
+# Add here only options that should not be applied to avr-ioe also.
+CFLAGS = -I../../include -mmcu=$(MMCU) -imacros build/config.h \
+	 $(shell echo $(CCFLAGS)) $(shell echo -DF_CPU=$(F_CPU)000L)
+CC = $(CHOST)gcc
+OBJCOPY = $(CHOST)objcopy
+
+$(EXAMPLE_NAME).elf: libioe.a
+$(EXAMPLE_NAME).elf: $(OBJ)
+	@echo " LD       $@"
+	$(Q)$(CC) -Os -mmcu=$(MMCU) $(filter %.o,$^) -o $@ -L. -lioe
+
+$(EXAMPLE_NAME).hex: $(EXAMPLE_NAME).elf
+	@echo " OBJCOPY  $@"
+	$(Q)$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+$(OBJ): %.o: %.c libioe.a
+	@echo " CC       $@"
+	$(Q)$(CC) $(CFLAGS) -c -o $@ $<
+
+libioe.a: $(CONFIG)
+	$(Q)$(MAKE) -C ../.. examples/$(EXAMPLE_NAME)/libioe.a O=examples/$(EXAMPLE_NAME)
+endif
+
+TOOL_PATH=../../tools
+IOEROOT=../../
+include ../../tools/kconfig.mk
diff --git a/examples/usartecho/.config b/examples/usartecho/.config
deleted file mode 100644
index 48ae310..0000000
--- a/examples/usartecho/.config
+++ /dev/null
@@ -1,42 +0,0 @@
-#
-# Automatically generated file; DO NOT EDIT.
-# AVR-IOE configuration
-#
-MMCU="atmega328p"
-ATMEGA328P=y
-# ATTINY85 is not set
-# ATTINY4313 is not set
-F_CPU=16000
-
-#
-# Compilation options
-#
-GNUTOOLCHAIN_PREFIX="avr-"
-CONFCFLAGS="-Os -ffunction-sections -fdata-sections -fshort-enums -Wall"
-MCUSUPPORT_IOPORTS=y
-# CONFIG_IOPORTS is not set
-MCUSUPPORT_PCINT0=y
-MCUSUPPORT_PCINT1=y
-MCUSUPPORT_PCINT2=y
-MCUSUPPORT_SPI=y
-# CONFIG_SPI is not set
-MCUSUPPORT_USART=y
-CONFIG_USART=y
-CONFIG_USART_BAUD=115200
-USART_PARITY_C_NONE=y
-# USART_PARITY_C_ODD is not set
-# USART_PARITY_C_EVEN is not set
-CONFIG_USART_PARITY="USART_PARITY_NONE"
-CONFIG_USART_DATABITS=8
-USART_STOPBIT_C_SINGLE=y
-# USART_STOPBIT_C_DOUBLE is not set
-CONFIG_USART_STOPBIT="USART_STOPBIT_SINGLE"
-CONFIG_USART_OUTPUT_BUFFER=y
-CONFIG_USART_OUTBUFFER_SIZE=64
-USART_OUTBUFFER_MODE_C_BLOCK=y
-# USART_OUTBUFFER_MODE_C_OVERWRITE is not set
-# USART_OUTBUFFER_MODE_C_DROP is not set
-CONFIG_USART_OUTBUFFER_MODE=0
-# CONFIG_USART_INPUT_BUFFER is not set
-CONFIG_USART_INBUFFER_SIZE=32
-CONFIG_USART_INBUFFER_MODE=0
diff --git a/examples/usartecho/Kconfig b/examples/usartecho/Kconfig
new file mode 100644
index 0000000..3bfde28
--- /dev/null
+++ b/examples/usartecho/Kconfig
@@ -0,0 +1,11 @@
+mainmenu "AVR-IOE usartecho configuration"
+
+# We need CONFIG_IOPORTS, but we don't care about anything else.
+config USART_ECHO_DEFAULTS
+	bool
+	default y
+	select CONFIG_USART
+	select CONFIG_USART_OUTPUT_BUFFER
+	depends on ! CONFIG_USART_INPUT_BUFFER
+
+source "../../ioe.Kconfig"
diff --git a/examples/usartecho/Makefile b/examples/usartecho/Makefile
index 6e4e9d5..93a2783 100644
--- a/examples/usartecho/Makefile
+++ b/examples/usartecho/Makefile
@@ -1,69 +1,4 @@
-MAKEFLAGS += --no-builtin-rules
-PROJNAME = usartecho
-
+EXAMPLE_NAME = usartecho
 SRC = echo.c
 
-OBJ = $(patsubst %.c,%.o,$(SRC)) # This creates list of *.o files from *.c
-Q ?= @ # This can be overwritten to show commands
-
-.PHONY: all
-ifneq ("$(wildcard .config)","") # Checking if configuration exists
-all: $(PROJNAME).hex
-	@echo Now you can flash $< to your chip.
-else
-all: .config
-endif
-
-# Edit here help like you ever want
-.PHONY: help
-help:
-	@echo  "AVR-IOE USART echo example"
-	@echo  " all         - Build example"
-	@echo  " config      - Start configuration program"
-	@echo  " menuconfig  - NCurses based configuration program"
-	@echo  " help        - Prints this text"
-	@echo  " clean       - Removing all object files generated from source files"
-
-.PHONY: clean
-clean:
-	@echo " CLEAN OBJ"
-	$(Q)$(RM) $(OBJ)
-	@echo " CLEAN $(PROJNAME).elf $(PROJNAME).hex"
-	$(Q)$(RM) $(PROJNAME).elf $(PROJNAME).hex
-	$(Q)$(MAKE) -C ../.. clean O=examples/$(PROJNAME)
-
-# Building targets are available only if configuration is generated
-ifneq ("$(wildcard .config)","")
--include .config
-# If you want change some standard CFLAGS, change them in configuration not here.
-# Add here only options that should not be applied to avr-ioe also.
-CFLAGS = -I../../include -mmcu=$(MMCU) -imacros build/config.h \
-	 $(shell echo $(CONFCFLAGS)) $(shell echo -DF_CPU=$(F_CPU)000L)
-
-$(PROJNAME).elf: libioe.a
-$(PROJNAME).elf: $(OBJ)
-	@echo " LD       $@"
-	@avr-gcc -Os -mmcu=$(MMCU) $(filter %.o,$^) -o $@ -L. -lioe
-
-$(PROJNAME).hex: $(PROJNAME).elf
-	@echo " OBJCOPY  $@"
-	$(Q)avr-objcopy -O ihex -R .eeprom $< $@
-
-$(OBJ): %.o: %.c libioe.a
-	@echo " CC       $@"
-	$(Q)avr-gcc $(CFLAGS) -c -o $@ $<
-
-libioe.a: .config
-	$(Q)$(MAKE) -C ../.. examples/$(PROJNAME)/libioe.a O=examples/$(PROJNAME)
-endif
-
-.config:
-	@echo Configuration for this example is missing. Probably deleted...
-	@exit 1
-
-config:
-	$(Q)$(MAKE) -C ../.. config O=examples/$(PROJNAME)
-
-.PHONY: menuconfig
-menuconfig:
-	$(Q)$(MAKE) -C ../.. menuconfig O=examples/$(PROJNAME)
+include ../examples.mk
diff --git a/include/ioport.h b/include/ioport.h
index 1022493..95b6205 100644
--- a/include/ioport.h
+++ b/include/ioport.h
@@ -9,36 +9,36 @@
 #ifdef CONFIG_IOPORTS
 
 enum ioInResistor {
-    IO_PULLUP,
-    IO_PULLDOWN
+	IO_PULLUP,
+	IO_PULLDOWN
 };
 
 static inline void io_setout(uint8_t group, uint8_t mask) {
-    IO_DDR(group) |= mask;
+	IO_DDR(group) |= mask;
 }
-static inline void io_hight(uint8_t group, uint8_t mask) {
-    IO_PORT(group) |= mask;
+static inline void io_high(uint8_t group, uint8_t mask) {
+	IO_PORT(group) |= mask;
 }
 static inline void io_low(uint8_t group, uint8_t mask) {
-    IO_PORT(group) &= ~mask;
+	IO_PORT(group) &= ~mask;
 }
 static inline void io_set(uint8_t group, uint8_t mask, int8_t val) {
-    if (val)
-        io_hight(group, mask);
-    else
-        io_low(group, mask);
+	if (val)
+		io_high(group, mask);
+	else
+		io_low(group, mask);
 }
 
 static inline void io_setin(uint8_t group, uint8_t mask,
                             enum ioInResistor resistor) {
-    IO_DDR(group) &= ~mask;
-    if (resistor == IO_PULLUP)
-        IO_PORT(group) |= mask;
-    else
-        IO_PORT(group) &= ~mask;
+	IO_DDR(group) &= ~mask;
+	if (resistor == IO_PULLUP)
+		IO_PORT(group) |= mask;
+	else
+		IO_PORT(group) &= ~mask;
 }
 static inline int8_t io_get(uint8_t group, uint8_t mask) {
-    return (int8_t) IO_PIN(group) & mask;
+	return (int8_t) IO_PIN(group) & mask;
 }
 
 #ifdef CONFIG_PCINT
@@ -46,7 +46,7 @@ static inline int8_t io_get(uint8_t group, uint8_t mask) {
 #define IO_RISING (1 << 0)
 #define IO_FALLING (1 << 1)
 void io_change_sethook(uint8_t group, uint8_t mask, uint8_t edge,
-                         void (*change) (uint8_t group, uint8_t mask));
+						void (*change) (uint8_t group, uint8_t mask));
 void io_change_remhook(void (*change) (uint8_t group, uint8_t mask));
 void io_change_clearhooks(void);
 
diff --git a/include/usart.h b/include/usart.h
index 76e423d..bb80885 100644
--- a/include/usart.h
+++ b/include/usart.h
@@ -4,7 +4,6 @@
 #include <stdio.h>
 
 #include "mcu/mcu_def.h"
-#include "tasks.h"
 #include "utils/buffer.h"
 
 #ifndef _USART_H_
@@ -39,10 +38,10 @@ void usart_send_str(char *str);
 uint8_t usart_get(void);
 #endif
 static inline uint8_t usart_queryerror(void) {
-    return UCSR0A & (_BV(FE0) | _BV(DOR0) | _BV(UPE0));
+	return UCSR0A & (_BV(FE0) | _BV(DOR0) | _BV(UPE0));
 }
 static inline int8_t usart_busy(void) {
-    return _usart_busy;
+	return _usart_busy;
 }
 #ifdef CONFIG_USART_INPUT_BUFFER
 uint8_t usart_inbuffered(void);
diff --git a/ioe.Kconfig b/ioe.Kconfig
new file mode 100644
index 0000000..22dd75f
--- /dev/null
+++ b/ioe.Kconfig
@@ -0,0 +1,280 @@
+# vim:ft=kconfig
+
+config IOEROOT
+	string
+	option env="IOEROOT"
+source "$IOEROOT/include/mcu/Kconfig"
+
+config F_CPU
+	int "CPU frequency in kHz (F_CPU)"
+	default 16000
+	---help---
+	Frequency CPU is running on. This must be value in kHz.
+
+# Toolchain #####################################################################
+
+menu "Compilation options"
+
+config CHOST
+	string "AVR Compilation toolchain prefix (host)"
+	default "avr-"
+	---help---
+	Prefix used for all calls to compilation toolchain when compiling for AVR.
+
+config CCFLAGS
+	string "AVR compilation flags"
+	default "-Os -ffunction-sections -fdata-sections -fshort-enums -Wall"
+	---help---
+	C compilation flags for AVR host. Its suggested to not remove defaults unless
+	you know what they do.
+
+config CLDFLAGS
+	string "AVR linking flags"
+	default ""
+	---help---
+	C linking flags for AVR host.
+
+config CBUILD
+	string "Building machine compilation toolchain prefix (build)"
+	default ""
+	---help---
+	Prefix used for all calls to compilation toolchain when compiling applications
+	used for compilation or testing.
+
+config BUILD_CFLAGS
+	string "Bulding machine compilation flags"
+	default "-Wall"
+	---help---
+	C compilation flags for build.
+
+config BUILD_LDFLAGS
+	string "Building machine linking flags"
+	default ""
+	---help---
+	C linking flags for build.
+
+endmenu
+
+# Error handling ################################################################
+
+config CONFIG_ERRORS
+	bool "Errors support"
+	default y
+	---help---
+	This enables error handling. This enables some checks and allows both avr-ioe
+	and you program to react on errors. This doesn't handless hardware errors,
+	only software ones.
+
+if CONFIG_ERRORS
+
+menu "Errors handling"
+
+config CONFIG_EH_RESTART
+	bool "Restart MCU on error detection"
+	default n
+	---help---
+	CPU is restarted when error is detected. This is suggested in production.
+
+config CONFIG_EH_HANG
+	bool "Hang execution until manual restart on error detection"
+	default n
+	---help---
+	Program hangs execution when error is detected. This is suggested in
+	development.
+
+config CONFIG_EH_LED
+	bool "Signal error detection by LED"
+	depends on CONFIG_IOPORTS
+	default n
+	---help---
+	When error is detected, specified output is pulled up. This is handy with
+	CONFIG_EH_HANG. If you use this with CONFIG_EH_RESTART you will probably
+	miss led blink.
+
+config CONFIG_EH_LED_IOPIN
+	string "Error detection led output pin"
+	depends on CONFIG_EH_LED
+	default "IO_B0"
+	---help---
+	Specifies IO pin which will be pulled up on error detection.
+	This string should be valid IO port (for example "IO_B0") or pair of group
+	mask divided by comma (for example "IO_B, _BV(0)").
+
+endmenu
+
+config CONFIG_ERROR_MESSAGES
+	bool "Build with error messages"
+	default n
+	---help---
+	If errors should support messages. Compiling error messages to code can be
+	handy to finding out errors, but also makes program unnecessary big.
+
+config CONFIG_ERROR_CALLBACK
+	bool "User program implements callback to be used to optionally resolve error"
+	default n
+	---help---
+	This allows user program to define error callback to be called just after
+	error is detected. This also can suppress error, but that is dangerous and
+	should be used only with deep understanding of what it means.
+
+config CONFIG_CHECK_ARGUMENTS
+	bool "Check arguments for all functions in library"
+	default n
+	---help---
+	If arguments passed to functions in library should be checked and
+	possibly error should be risen.
+
+endif
+
+# IO Ports ######################################################################
+
+config MCUSUPPORT_IOPORTS
+	bool
+	default n
+
+config CONFIG_IOPORTS
+	bool "Input/Output ports"
+	default y
+	depends on MCUSUPPORT_IOPORTS
+
+config MCUSUPPORT_PCINT0
+	bool
+	default n
+config MCUSUPPORT_PCINT1
+	bool
+	default n
+config MCUSUPPORT_PCINT2
+	bool
+	default n
+
+config CONFIG_IOPORTS_PCINT
+	bool "Input/Output ports change interrupts"
+	depends on CONFIG_IOPORTS
+	depends on MCUSUPPORT_PCINT0 || MCUSUPPORT_PCINT1 || MCUSUPPORT_PCINT2
+
+# SPI ###########################################################################
+
+config MCUSUPPORT_SPI
+	bool
+	default n
+
+config CONFIG_SPI
+	bool "SPI (Serial peripheral interface)"
+	depends on MCUSUPPORT_SPI
+
+# USART #########################################################################
+config MCUSUPPORT_USART
+	bool
+	default n
+
+menuconfig CONFIG_USART
+	bool "USART (Universal synchronous/asynchronous transceiver)"
+	depends on MCUSUPPORT_USART
+
+if CONFIG_USART
+
+config CONFIG_USART_BAUD
+	int "Baudrate"
+	default 115200
+
+choice USART_PARITY_C
+	prompt "Parity"
+config USART_PARITY_C_NONE
+	bool "None"
+config USART_PARITY_C_ODD
+	bool "Odd"
+config USART_PARITY_C_EVEN
+	bool "Even"
+endchoice
+config CONFIG_USART_PARITY
+	string
+	default "USART_PARITY_NONE" if USART_PARITY_C_NONE
+	default "USART_PARITY_ODD" if USART_PARITY_C_ODD
+	default "USART_PARITY_EVEN" if USART_PARITY_C_EVEN
+
+config CONFIG_USART_DATABITS
+	int "Data bits"
+	default 8
+	range 5 8
+
+choice USART_STOPBIT_C
+	prompt "Stop bit"
+config USART_STOPBIT_C_SINGLE
+	bool "Single"
+config USART_STOPBIT_C_DOUBLE
+	bool "Double"
+endchoice
+config CONFIG_USART_STOPBIT
+	string
+	default "USART_STOPBIT_SINGLE" if USART_STOPBIT_C_SINGLE
+	default "USART_STOPBIT_DOUBLE" if USART_STOPBIT_C_DOUBLE
+
+config CONFIG_USART_OUTPUT_BUFFER
+	bool "Use output buffer"
+	default n
+
+config CONFIG_USART_OUTBUFFER_SIZE
+	int "Output buffer size in bytes." if CONFIG_USART_OUTPUT_BUFFER
+	default 0 if ! CONFIG_USART_OUTPUT_BUFFER
+	range 1 512000 if CONFIG_USART_OUTPUT_BUFFER
+	default 32
+
+choice USART_OUTBUFFER_MODE_C
+	prompt "Output buffer replacement policy" if CONFIG_USART_OUTPUT_BUFFER
+config USART_OUTBUFFER_MODE_C_BLOCK
+	bool "Block"
+config USART_OUTBUFFER_MODE_C_OVERWRITE
+	bool "Overwrite"
+config USART_OUTBUFFER_MODE_C_DROP
+	bool "Drop"
+config USART_OUTBUFFER_MODE_C_ERROR
+	depends  on CONFIG_ERRORS
+	bool "Error"
+endchoice
+config CONFIG_USART_OUTBUFFER_MODE
+	int
+	default 1 if USART_OUTBUFFER_MODE_C_OVERWRITE
+	default 2 if USART_OUTBUFFER_MODE_C_DROP
+	default 0
+
+config CONFIG_USART_INPUT_BUFFER
+	bool "Use input buffer"
+
+config CONFIG_USART_INBUFFER_SIZE
+	int "Input buffer size in bytes." if CONFIG_USART_INPUT_BUFFER
+	default 0 if ! CONFIG_USART_INPUT_BUFFER
+	range 1 512000 if CONFIG_USART_INPUT_BUFFER
+	default 32
+
+choice USART_INBUFFER_MODE_C
+	prompt "Input buffer replacement policy" if CONFIG_USART_INPUT_BUFFER
+config USART_INBUFFER_MODE_C_BLOCK
+	bool "Block"
+config USART_INBUFFER_MODE_C_OVERWRITE
+	bool "Overwrite"
+config USART_INBUFFER_MODE_C_DROP
+	bool "Drop"
+config USART_INBUFFER_MODE_C_ERROR
+	depends  on CONFIG_ERRORS
+	bool "Error"
+endchoice
+config CONFIG_USART_INBUFFER_MODE
+	int
+	default 1 if USART_INBUFFER_MODE_C_OVERWRITE
+	default 2 if USART_INBUFFER_MODE_C_DROP
+	default 0
+
+config CONFIG_USART_OUTFILE
+	bool "STD FILE support for output"
+	depends on CONFIG_USART_OUTPUT_BUFFER
+
+config CONFIG_USART_INFILE
+	bool "STD FILE support for input"
+	depends on CONFIG_USART_INPUT_BUFFER
+
+endif
+
+# Timers ########################################################################
+
+config CONFIG_TIMERS
+	bool "Timers"
diff --git a/src/error.c b/src/error.c
index 1c75382..9f4166b 100644
--- a/src/error.c
+++ b/src/error.c
@@ -24,7 +24,7 @@ void _error(enum ErrorCodes ec) {
 #ifdef CONFIG_EH_LED
 	// Set led
 	io_setout(CONFIG_EH_LED_IOPIN);
-	io_hight(CONFIG_EH_LED_IOPIN);
+	io_high(CONFIG_EH_LED_IOPIN);
 #endif /* CONFIG_EH_LED */
 
 #ifdef CONFIG_EH_HANGS
diff --git a/src/sources.mk b/src/sources.mk
new file mode 100644
index 0000000..8616e46
--- /dev/null
+++ b/src/sources.mk
@@ -0,0 +1,19 @@
+# vim:ts=4:sw=4:sts=4:noexpandtab
+
+# Essential sources
+SRC = base.c
+
+# IO ports
+ifeq (y,$(CONFIG_IOPORTS))
+SRC += ioport.c
+endif
+
+# SPI
+ifeq (y,$(CONFIG_SPI))
+SRC += spi.c
+endif
+
+# UART
+ifeq (y,$(CONFIG_USART))
+SRC += usart.c
+endif
diff --git a/src/usart.c b/src/usart.c
index 3da91ef..12c1fc7 100644
--- a/src/usart.c
+++ b/src/usart.c
@@ -11,126 +11,126 @@
 volatile int8_t _usart_busy;
 
 void usart_init_async(void) {
-    _usart_busy = 0;
+	_usart_busy = 0;
 #define BAUD CONFIG_USART_BAUD
 #include <util/setbaud.h>
-    UBRR0H = UBRRH_VALUE;
-    UBRR0L = UBRRL_VALUE;
+	UBRR0H = UBRRH_VALUE;
+	UBRR0L = UBRRL_VALUE;
 #if USE_2X
-    UCSR0A |= _BV(U2X0);
+	UCSR0A |= _BV(U2X0);
 #else
-    UCSR0A &= ~_BV(U2X0);
+	UCSR0A &= ~_BV(U2X0);
 #endif
 
-    UCSR0C = 0 |
+	UCSR0C = 0 |
 // USART_PARITY_NONE are both UMP01 and UMP00 zero
 #if CONFIG_USART_PARITY == USART_PARITY_ODD
-        _BV(UPM01) |
+		_BV(UPM01) |
 #elif CONFIG_USART_PARITY == USART_PARITY_EVEN
-        _BV(UPM00) | _BV(UPM01) |
+		_BV(UPM00) | _BV(UPM01) |
 #endif
 // USART_STOPBIT_SINGLE is USBS0 zero
 #if CONFIG_USART_STOPBIT == USART_STOPBIT_DOUBLE
-        _BV(USBS0) |
+		_BV(USBS0) |
 #endif
 // For 5 databits are UCSZ00 and UCSZ01 zero
 #if CONFIG_USART_DATABITS == 6
-        _BV(UCSZ00)
+		_BV(UCSZ00)
 #elif CONFIG_USART_DATABITS == 7
-        _BV(UCSZ01)
+		_BV(UCSZ01)
 #elif CONFIG_USART_DATABITS == 8
-        _BV(UCSZ00) | _BV(UCSZ01)
+		_BV(UCSZ00) | _BV(UCSZ01)
 #endif
-        ;
-    // Enable receiver, transmitter and RX complete,
-    // Data register empty interrupts
-    UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0) | _BV(UDRIE0);
+		;
+	// Enable receiver, transmitter and RX complete,
+	// Data register empty interrupts
+	UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0) | _BV(UDRIE0);
 #ifdef CONFIG_USART_INPUT_BUFFER
-    IOEBUFFER_INIT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE);
+	IOEBUFFER_INIT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE);
 #endif
 #ifdef CONFIG_USART_OUTPUT_BUFFER
-    IOEBUFFER_INIT(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE);
+	IOEBUFFER_INIT(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE);
 #endif
 }
 
 inline void usart_send(uint8_t data) {
 #ifdef CONFIG_USART_OUTPUT_BUFFER
-    if (!_usart_busy) {
-        _usart_busy = 1;
-        UDR0 = data;
-    } else {
-        IOEBUFFER_PUT(_ioe_usart_outbuffer,
-                      CONFIG_USART_OUTBUFFER_SIZE, data,
-                      CONFIG_USART_OUTBUFFER_MODE);
-    }
+	if (!_usart_busy) {
+		_usart_busy = 1;
+		UDR0 = data;
+	} else {
+		IOEBUFFER_PUT(_ioe_usart_outbuffer,
+					  CONFIG_USART_OUTBUFFER_SIZE, data,
+					  CONFIG_USART_OUTBUFFER_MODE);
+	}
 #else
-    _usart_busy = 1;
-    UDR0 = data;
+	_usart_busy = 1;
+	UDR0 = data;
 #endif /* CONFIG_USART_OUTPUT_BUFFER */
 }
 
 #ifdef CONFIG_USART_OUTPUT_BUFFER
 inline void usart_send_str(char *str) {
-    while (*str != '\0') {
-        usart_send((uint8_t) * str);
-        str++;
-    }
+	while (*str != '\0') {
+		usart_send((uint8_t) * str);
+		str++;
+	}
 }
 #endif /* CONFIG_USART_OUTPUT_BUFFER */
 
 #ifdef CONFIG_USART_INPUT_BUFFER
 uint8_t usart_get(void) {
-    uint8_t rtn;
-    IOEBUFFER_GET(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
-                  rtn);
-    return rtn;
+	uint8_t rtn;
+	IOEBUFFER_GET(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
+				  rtn);
+	return rtn;
 }
 #endif
 
 #ifdef CONFIG_USART_INPUT_BUFFER
 uint8_t usart_inbuffered(void) {
-    uint8_t rtn;
-    IOEBUFFER_CNT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
-                  rtn);
-    return rtn;
+	uint8_t rtn;
+	IOEBUFFER_CNT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
+				  rtn);
+	return rtn;
 }
 #endif
 
 #ifdef CONFIG_USART_OUTPUT_BUFFER
 uint8_t usart_outbuffered(void) {
-    uint8_t rtn;
-    IOEBUFFER_CNT(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE,
-                  rtn);
-    return rtn;
+	uint8_t rtn;
+	IOEBUFFER_CNT(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE,
+				  rtn);
+	return rtn;
 }
 #endif
 
 #ifdef CONFIG_USART_OUTFILE
 static int usartput(char c, FILE * f) {
-    usart_send((uint8_t) c);
-    return 0;
+	usart_send((uint8_t) c);
+	return 0;
 }
 #endif
 
 #ifdef CONFIG_USART_INPUT_BUFFER
 static int usartget(FILE * f) {
-    uint8_t v;
-    while (!(v = usart_get()));
-    return v;
+	uint8_t v;
+	while (!(v = usart_get()));
+	return v;
 }
 #endif
 
 #if (defined CONFIG_USART_INFILE) || (defined CONFIG_USART_OUTFILE)
 FILE *usart_async_open(void) {
-    usart_init_async();
+	usart_init_async();
 #ifdef CONFIG_USART_OUTFILE
 #ifdef CONFIG_USART_INFILE
-    return fdevopen(usartput, usartget);
+	return fdevopen(usartput, usartget);
 #else
-    return fdevopen(usartput, 0);
+	return fdevopen(usartput, 0);
 #endif
 #else
-    return fdevopen(0, usartget);
+	return fdevopen(0, usartget);
 #endif
 }
 #endif
@@ -141,28 +141,28 @@ void (*usart_sent) (void) = 0;
 
 SIGNAL(USART_RX_vect) {
 #ifdef CONFIG_USART_INPUT_BUFFER
-    uint8_t val = UDR0;
-    IOEBUFFER_PUT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
-                  val, CONFIG_USART_INBUFFER_MODE);
+	uint8_t val = UDR0;
+	IOEBUFFER_PUT(_ioe_usart_inbuffer, CONFIG_USART_INBUFFER_SIZE,
+				  val, CONFIG_USART_INBUFFER_MODE);
 #endif /* CONFIG_USART_INPUT_BUFFER */
-    if (usart_receive)
-        usart_receive(UDR0);
+	if (usart_receive)
+		usart_receive(UDR0);
 }
 
 SIGNAL(USART_UDRE_vect) {
 #ifdef CONFIG_USART_OUTPUT_BUFFER
-    uint8_t val;
-    IOEBUFFER_GET(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE,
-                  val);
-    if (val)
-        UDR0 = val;
-    else
-        _usart_busy = 0;
+	uint8_t val;
+	IOEBUFFER_GET(_ioe_usart_outbuffer, CONFIG_USART_OUTBUFFER_SIZE,
+				  val);
+	if (val)
+		UDR0 = val;
+	else
+		_usart_busy = 0;
 #else
-    _usart_busy = 0;
+	_usart_busy = 0;
 #endif /* CONFIG_USART_OUTPUT_BUFFER */
-    if (usart_sent)
-        usart_sent();
+	if (usart_sent)
+		usart_sent();
 }
 
 #endif /* CONFIG_USART */
diff --git a/template/Makefile b/template/Makefile
index 59218a2..0661d7b 100644
--- a/template/Makefile
+++ b/template/Makefile
@@ -1,5 +1,5 @@
 MAKEFLAGS += --no-builtin-rules
-# Change PROJNAME value to you project name
+# Change PROJNAME value to your project name
 # Care to not make any space at the end!
 PROJNAME = template
 
diff --git a/tools/kconfig.mk b/tools/kconfig.mk
new file mode 100644
index 0000000..c07bbfa
--- /dev/null
+++ b/tools/kconfig.mk
@@ -0,0 +1,44 @@
+# vim:ts=4:sw=4:sts=4:noexpandtab
+
+ifndef TOOL_PATH
+$(error Before including kconfig.mk you have to define path to tools in variable TOOL_PATH)
+endif
+ifndef CONFIG
+$(error Before including kconfig.mk you have to define variable CONFIG contaning name of configuration file)
+endif
+
+$(CONFIG):
+	@echo Please generate configuration first using config or menuconfig target
+	@exit 1
+
+# We don't wont pass any variable to Kconfig. This is workaround for that.
+# So include of this file should be last line in Makefile
+MAKEOVERRIDES =
+
+callconfig = $(Q)\
+	[ ! -f "$(CONFIG)" ] || mv "$(CONFIG)" config; \
+	IOEROOT="$(IOEROOT)" $(MAKE) -f "$(TOOL_PATH)/kconfig/GNUmakefile" --no-print-directory \
+		TOPDIR=. SRCDIR="$(TOOL_PATH)/kconfig" $(1); \
+	[ ! -f config ] || mv config "$(CONFIG)"; \
+	[ ! -f config.old ] || mv config.old "$(CONFIG).old"
+# Note about this file moving madness:
+# avr-ioe is using Kconfig for configuration and it is not prepared too well for
+# nested projects (at least I don't know way). This unfortunately means that to
+# have configuration in parent project, We have to move it every time we are
+# generating it. Also upper projects can't use Kconfig for its self configuration.
+
+.PHONY: oldconfig
+oldconfig: $(deps_config)
+	$(call callconfig, oldconfig)
+
+.PHONY: config
+config: $(deps_config)
+	$(call callconfig, config)
+
+.PHONY: menuconfig
+menuconfig: $(deps_config)
+	$(call callconfig, menuconfig)
+
+.PHONY: allyesconfig
+allyesconfig: $(deps_config)
+	$(call callconfig, allyesconfig)