Add some more progress and split non-core functionality to separate repo

More progress to implementation and some changes in project it self.
This library will implement only drivers for features on chip but
nothing else. Everything connected externally is now in separate
repository.

34 files changed, 186 insertions, 373 deletions

diff --git a/.gitignore b/.gitignore
index fbf84a3..2e0f06f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,5 +8,9 @@
 *.d
 *.hex
 *.elf
+*.old
+html
+build
 trash
 libioe.a
+install.sh
diff --git a/Makefile b/Makefile
index c17404b..ae17fef 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+# vim:ts=4:sw=4:sts=4:noexpandtab
 MAKEFLAGS += --no-builtin-rules
 
 # Default output path. Can be changed by enviroment to compile to different folder
@@ -53,17 +54,17 @@ $(O)/libioe.a: $(OBJ)
 	$(Q)$(AR) -crs $@ $^
 
 $(OBJ): $(O)/build/%.o: src/%.c
-	$(Q)mkdir -p "$(@D)"
+	@mkdir -p "$(@D)"
 	@echo " CC   $@"
 	$(Q)$(GCC) $(CFLAGS) -c -o $@ $<
 
 $(DEP): $(O)/build/%.d: src/%.c $(O)/build/config.h
-	$(Q)mkdir -p "$(@D)"
+	@mkdir -p "$(@D)"
 	@echo " DEP  $@"
 	$(Q)$(CPP) -MM -MG -MT '$(O)/build/$*.o $@' $(CFLAGS) -o $@ $<
 
 $(O)/build/config.h: $(CONFIG)
-	$(Q)mkdir -p "$(@D)"
+	@mkdir -p "$(@D)"
 	@echo " GEN  $@"
 	$(Q)grep -v "^#" $(CONFIG) | grep "CONFIG_" | sed -e 's/="\(.*\)"/=\1/;s/=/ /;s/^/#define /' > $@
 
diff --git a/README.md b/README.md
index fd3eed6..a1c3b6d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-#AVR-IOE
+#  AVR-IOE
 [![Build Status](https://travis-ci.com/Cynerd/avr-ioe.svg?token=j1mJhmD5jiZyJQGyPUkt&branch=master)](https://travis-ci.com/Cynerd/avr-ioe)
-##AVR input/output expansion
+## AVR input/output expansion
 
 This is library that implements different input/output interfaces and other
 utilities. Its target is to create simple and highly configurable pack of code for
diff --git a/docs/index.md b/docs/index.md
index c39df46..23b6cb9 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -6,8 +6,8 @@ Parts
 Whole library consists from set of parts. You can use any part directly or
 only trough other part. Every part can be enabled or disabled.
 
-| Parts                         | Header   | Description                                            |
-|-------------------------------|----------|--------------------------------------------------------|
-| [IO Ports](parts/ioport.md) | ioport.h | Simple input/output port access                        |
-| [SPI](parts/spi.md)         | spi.h    | Serial peripheral interface                            |
-| [USART](parts/usart.md)     | usart.h  | Universal synchronous/asynchronous receive/transmitter |
+| Parts                            | Header   | Description                                            |
+|----------------------------------|----------|--------------------------------------------------------|
+| [IO Ports](references/ioport.md) | ioport.h | Simple input/output port access                        |
+| [SPI](references/spi.md)         | spi.h    | Serial peripheral interface                            |
+| [USART](references/usart.md)     | usart.h  | Universal synchronous/asynchronous receive/transmitter |
diff --git a/docs/miscellanoues/jobs_vs_tasks.md b/docs/miscelaneous/jobs_vs_tasks.md
index 17d7fdd..17d7fdd 100644
--- a/docs/miscellanoues/jobs_vs_tasks.md
+++ b/docs/miscelaneous/jobs_vs_tasks.md
diff --git a/docs/parts/ioport.md b/docs/references/ioport.md
index 96a4b82..96a4b82 100644
--- a/docs/parts/ioport.md
+++ b/docs/references/ioport.md
diff --git a/docs/parts/jobs.md b/docs/references/jobs.md
index 878a557..878a557 100644
--- a/docs/parts/jobs.md
+++ b/docs/references/jobs.md
diff --git a/docs/parts/spi.md b/docs/references/spi.md
index f63d304..f63d304 100644
--- a/docs/parts/spi.md
+++ b/docs/references/spi.md
diff --git a/docs/parts/tasks.md b/docs/references/tasks.md
index e4f71df..e4f71df 100644
--- a/docs/parts/tasks.md
+++ b/docs/references/tasks.md
diff --git a/docs/parts/timer.md b/docs/references/timer.md
index e69de29..e69de29 100644
--- a/docs/parts/timer.md
+++ b/docs/references/timer.md
diff --git a/docs/parts/usart.md b/docs/references/usart.md
index 22e54ab..22e54ab 100644
--- a/docs/parts/usart.md
+++ b/docs/references/usart.md
diff --git a/docs/parts/utils/buffer.md b/docs/references/utils/buffer.md
index 4365c25..4365c25 100644
--- a/docs/parts/utils/buffer.md
+++ b/docs/references/utils/buffer.md
diff --git a/docs/parts/utils/narray.md b/docs/references/utils/narray.md
index 3e64f67..3e64f67 100644
--- a/docs/parts/utils/narray.md
+++ b/docs/references/utils/narray.md
diff --git a/examples/blink/blink.c b/examples/blink/blink.c
index 8386d4b..6a81aee 100644
--- a/examples/blink/blink.c
+++ b/examples/blink/blink.c
@@ -3,12 +3,12 @@
 #include <ioport.h>
 
 int main() {
-    io_setout(IO_B3);
+    io_setout(IO_B0);
 
     while (1) {
-        io_hight(IO_B3);
+        io_hight(IO_B0);
         _delay_ms(500);
-        io_low(IO_B3);
+        io_low(IO_B0);
         _delay_ms(500);
     }
 }
diff --git a/examples/blink/build/config.h b/examples/blink/build/config.h
new file mode 100644
index 0000000..5fff870
--- /dev/null
+++ b/examples/blink/build/config.h
@@ -0,0 +1 @@
+#define CONFIG_IOPORTS y
diff --git a/examples/dht22usart/dht22.c b/examples/dht22usart/dht22.c
deleted file mode 100644
index ec643aa..0000000
--- a/examples/dht22usart/dht22.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <util/delay.h>
-#include <string.h>
-#include "../../usart.h"
-//#include "../../sensor_dht22.h"
-
-void rec(uint8_t data) {
-    if (data == '\r') {
-        // TODO read sensor and send data
-    }
-}
-
-const struct dht22_port dht22_ports[] = {
-    {&DDRC, &PORTC, &PINC, _BV(PORTC4), NULL, 0}
-};
-
-int main() {
-    //usart_async_open();
-    //sei();
-    //usart_receive = rec;
-    //dht22_init(0);
-
-    timer_init(COUNTER0_PWM);
-    while (1);
-}
diff --git a/examples/dht22usart/makefile b/examples/dht22usart/makefile
deleted file mode 100644
index fb69068..0000000
--- a/examples/dht22usart/makefile
+++ /dev/null
@@ -1,40 +0,0 @@
-MAKEFLAGS += --no-builtin-rules
-
-MMCU = atmega328p
-F_CPU = 16000000L
-IOE_PREFIX = ../..
-IOE_SHORTOUTPUT=y
-IOE_CFLAGS = -Os -ffunction-sections -fdata-sections -fshort-enums -Wall \
-			 -DF_CPU=$(F_CPU) -mmcu=$(MMCU) \
-			 -DCONFIG_IOE_USART \
-			 -DCONFIG_IOE_USART_OUTBUFFER_SIZE=64 \
-			 -DCONFIG_IOE_USART_OUTBUFFER_MODE=0 \
-			 -DCONFIG_IOE_USART_OUTFILE \
-			 -DCONFIG_IOE_USART_BAUD=115200 \
-			 -DCONFIG_IOE_USART_PARITY=USART_PARITY_NONE \
-			 -DCONFIG_IOE_USART_STOPBIT=USART_STOPBIT_SINGLE \
-			 -DCONFIG_IOE_USART_DATABITS=8 \
-			 -DCONFIG_IOE_TIMERS \
-			 -DCONFIG_IOE_SENSOR_DHT22 \
-			 -DCONFIG_IOE_SENSOR_DHT22_TIMER=COUNTER0_PWM
-
-all: dht22.hex
-	@echo Now you can flash dht22.hex to your chip.
-
-clean: ioeclean
-	$(RM) dht22.o
-	$(RM) dht22.elf dht22.hex
-
-include ../../avr-ioe.mk
-
-dht22.elf: %.elf: $(IOE_OBJ) dht22.o
-	@echo " LD       $@"
-	@avr-gcc -Os -mmcu=$(MMCU) $^ -o $@
-
-dht22.hex: %.hex: %.elf
-	@echo " OBJCOPY  $@"
-	@avr-objcopy -O ihex -R .eeprom $< $@
-
-dht22.o: %.o: %.c
-	@echo " CC       $@"
-	@avr-gcc $(IOE_CFLAGS) -c -o $@ $<
diff --git a/include/adc.h b/include/adc.h
index 86429a1..f865b99 100644
--- a/include/adc.h
+++ b/include/adc.h
@@ -1,3 +1,4 @@
+// vim:ts=4:sw=4:sts=4:expandtab
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <stdint.h>
diff --git a/include/eeprom.h b/include/eeprom.h
new file mode 100644
index 0000000..31da039
--- /dev/null
+++ b/include/eeprom.h
@@ -0,0 +1,2 @@
+#include <stdint.h>
+
diff --git a/include/error.h b/include/error.h
new file mode 100644
index 0000000..7b13bcd
--- /dev/null
+++ b/include/error.h
@@ -0,0 +1,3 @@
+#include <stdint.h>
+
+#include <ioport.h>
diff --git a/include/jobs.h b/include/jobs.h
new file mode 100644
index 0000000..d2abbdc
--- /dev/null
+++ b/include/jobs.h
@@ -0,0 +1,8 @@
+#include <stdint.h>
+
+#ifndef _IOE_JOBS_H_
+#define _IOE_JOBS_H_
+
+
+
+#endif /* _IOE_JOBS_H_ */
diff --git a/include/sensors/dht22.h b/include/sensors/dht22.h
deleted file mode 100644
index aabb442..0000000
--- a/include/sensors/dht22.h
+++ /dev/null
@@ -1,42 +0,0 @@
-#include <avr/io.h>
-#include <util/delay.h>
-#include <stdint.h>
-
-#include "../tasks.h"
-#include "../timer.h"
-
-#ifndef _IOE_SENSOR_DHT22_H_
-#define _IOE_SENSOR_DHT22_H_
-#ifdef CONFIG_IOE_SENSOR_DHT22
-
-struct dht22_value {
-    uint8_t integral;
-    uint8_t decimal;
-};
-
-struct dht22_port {
-    volatile uint8_t *DDR;  // Address of DDR register
-    volatile uint8_t *PORT; // Address of PORT register
-    volatile uint8_t *PIN;  // Address of PIN register
-    uint8_t MASK;   // _BV() of index of port
-    volatile uint8_t *PCMSK;    // Address of relevant PCMSK register
-    uint8_t PCMSK_MASK; // _BV() of index of PCMSK
-};
-
-extern const struct dht22_port dht22_ports[];
-
-/*
- * Initialize port for sensor
- */
-void dht22_init(uint8_t port);
-
-/*
- * Read values from dht22
- * rh - relative
- * t  - temperature
- */
-int8_t dht22_read(uint8_t portindex, struct dht22_value *rh,
-                  struct dht22_value *t);
-
-#endif /* CONFIG_IOE_SENSOR_DHT22 */
-#endif /* _IOE_SENSOR_DHT22_H_ */
diff --git a/include/spi.h b/include/spi.h
index bdfce25..c4c003b 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -1,3 +1,4 @@
+// vim:ts=4:sw=4:sts=4:expandtab
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <stdint.h>
@@ -9,11 +10,6 @@
 #define _IOE_SPI_H_
 #ifdef CONFIG_SPI
 
-/*! \brief Modes definition for spi_init
- *
- * This enum is used by spi_init to define if SPI should be initialized as master
- * or slave.
- */
 enum spiMode {
     SPI_MODE_MASTER,
     SPI_MODE_SLAVE
@@ -22,10 +18,6 @@ enum spiMode {
 volatile extern int8_t _spi_busy;
 volatile extern Mutex spi_mutex;
 
-/*! \brief Initializes SPI interface.  
- *
- * \param mode Specify mode of SPI interface
- */
 static inline void spi_init(enum spiMode mode) {
     _spi_busy = 0;
     if (mode == SPI_MODE_MASTER) {
diff --git a/include/sys/mutex.h b/include/sys/mutex.h
new file mode 100644
index 0000000..f682e02
--- /dev/null
+++ b/include/sys/mutex.h
@@ -0,0 +1,32 @@
+#include <avr/io.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "../tasks.h"
+
+#ifndef _IOE_SYS_MUTEX_H_
+#define _IOE_SYS_MUTEX_H_
+#ifdef CONFIG_IOE_MUTEX
+
+#define MUTEX_F_TIMED (1<<0)
+#define MUTEX_F_TAKEN (1<<7)
+#define mutex_t volatile struct Mutex
+struct Mutex {
+    uint8_t flags;
+    Task *_task_took;
+};
+int8_t mutex_init(struct Mutex * mtx);
+int8_t mutex_free(struct Mutex * mtx);
+int8_t mutex_take(struct Mutex * mtx, uint16_t timeout);
+int8_t mutex_give(struct Mutex * mtx);
+
+#else /* CONFIG_IOE_MUTEX */
+
+#define mutex_t struct { }
+#define mutex_init(MTX, FLAGS)
+#define mutex_free(MTX)
+#define mutex_take(MTX, TIMEOUT)
+#define mutex_give(MTX);
+
+#endif /* CONFIG_IOE_MUTEX */
+#endif /* _IOE_SYS_MUTEX_H_ */
diff --git a/include/sys/semaphore.h b/include/sys/semaphore.h
new file mode 100644
index 0000000..0a25af3
--- /dev/null
+++ b/include/sys/semaphore.h
@@ -0,0 +1,31 @@
+#include <avr/io.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifndef _IOE_SYS_SEMAPHORE_H_
+#define _IOE_SYS_SEMAPHORE_H_
+#ifdef CONFIG_IOE_SEMAPHORE
+
+#define semaphore_t volatile struct Semaphore
+struct Semaphore {
+    uint8_t flags;
+    uint8_t _count;
+    Task **_tasks;
+    uint8_t _tasks_len;
+};
+int8_t semaphore_init(struct Semaphore * sem, uint8_t count);
+int8_t semaphore_free(struct Semaphore * sem);
+int8_t semaphore_take(struct Semaphore * sem, uint16_t timeout);
+int8_t semaphore_give(Semaphore * sem);
+
+#else /* CONFIG_IOE_SEMAPHORE */
+
+#define semaphore_t struct { }
+// TODO implement for single processor
+#define semaphore_init(SEM, FLAGS, COUNT)
+#define semaphore_free(SEM)
+#define semaphore_take(SEM, TIMEOUT)
+#define semaphore_give(SEM)
+
+#endif /* CONFIG_IOE_SEMAPHORE */
+#endif /* _IOE_SYS_SEMAPHORE_H_ */
diff --git a/include/tasks.h b/include/tasks.h
index 27bd968..b62b093 100644
--- a/include/tasks.h
+++ b/include/tasks.h
@@ -22,17 +22,21 @@ union StackPointer {
     uint8_t lh8[2];
     uint16_t lh16;
 };
-typedef struct {
+
+struct Task {
     uint8_t flags;
     void (*func) (void *data);
     void *data;
     uint8_t _rflags;
     uint8_t _stack_size;
     union StackPointer _sp;
-} Task;
-int8_t task_spawn(Task * t, uint8_t stack_size);
+};
+typedef task_t volatile struct Task;
+
+int8_t task_spawn(struct Task * t, uint8_t stack_size);
+Task *tasks_self(void);
 void taks_exit(void);
-int8_t task_kill(Task * t);
+int8_t task_kill(struct Task * t);
 int8_t task_safe(void);
 int8_t task_unsafe(void);
 
@@ -40,55 +44,13 @@ int8_t task_delay(uint16_t cycles);
 int8_t task_delay_ms(uint16_t ms);
 int8_t task_delay_till(volatile int8_t * boolean, uint16_t ms);
 
-#define MUTEX_F_TIMED (1<<0)
-#define MUTEX_F_TAKEN (1<<7)
-typedef struct {
-    uint8_t flags;
-    Task *_task_took;
-} Mutex;
-int8_t mutex_init(Mutex * mtx);
-int8_t mutex_free(Mutex * mtx);
-int8_t mutex_take(Mutex * mtx, uint16_t timeout);
-int8_t mutex_give(Mutex * mtx);
-
-typedef struct {
-    uint8_t flags;
-    uint8_t _count;
-    Task **_tasks;
-    uint8_t _tasks_len;
-} Semaphore;
-int8_t semaphore_init(Semaphore * sem, uint8_t count);
-int8_t semaphore_free(Semaphore * sem);
-int8_t semaphore_take(Semaphore * sem, uint16_t timeout);
-int8_t semaphore_give(Semaphore * sem);
-
 #else /* CONFIG_IOE_TASKS */
 
-typedef struct {
-} Task;
-#define task_spawn(T, STACK_SIZE)
-#define task_exit()
-#define task_kill(T)
 #define task_safe()
 #define task_unsafe()
-
-#define task_delay(US) _delay_us(US) // TODO this should be cycles
+#define task_delay(CC) _delay_us(CC) // TODO this should be cycles
 #define task_delay_ms(MS) _delay_ms(MS)
 int8_t task_delay_till(volatile int8_t * boolean, uint16_t ms);
 
-typedef struct {
-} Mutex;
-#define mutex_init(MTX, FLAGS)
-#define mutex_free(MTX)
-#define mutex_take(MTX, TIMEOUT)
-#define mutex_give(MTX);
-
-typedef struct {
-} Semaphore;
-#define semaphore_init(SEM, FLAGS, COUNT)
-#define semaphore_free(SEM)
-#define semaphore_take(SEM, TIMEOUT)
-#define semaphore_give(SEM)
-
 #endif /* CONFIG_IOE_TASKS */
 #endif /* _IOE_TASKS_H_ */
diff --git a/include/timer.h b/include/timer.h
index 4fef95c..473110f 100644
--- a/include/timer.h
+++ b/include/timer.h
@@ -1,3 +1,4 @@
+// vim:ts=4:sw=4:sts=4:expandtab
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <stdint.h>
diff --git a/include/usi-spi.h b/include/usi-spi.h
new file mode 100644
index 0000000..18534ab
--- /dev/null
+++ b/include/usi-spi.h
@@ -0,0 +1,66 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdint.h>
+
+#include "mcu/mcu_def.h"
+
+#ifndef _IOE_USI_SPI_H_
+#define _IOE_USI_SPI_H_
+
+#ifndef MCUSUPPORT_USI
+#error "No USI interface is known on your mcu."
+#endif
+
+enum usiSpiMode {
+    // Device is initialized as master
+    USI_SPI_MODE_MASTER,
+    // Device is initialized as slave
+    USI_SPI_MODE_SLAVE,
+};
+
+/*
+ * Initialize SPI on USI device
+ *
+ *  Parameters:
+ *    mode - Specify mode of SPI interface
+ */
+void usi_spi_init(enum usiSpiMode mode);
+/*
+ * Returns NULL when device is not busy.
+ * When device is busy return values in non-zero.
+ */
+int8_t usi_spi_busy(void);
+/*
+ * Blocks processor until device is not busy.
+ */
+void usi_spi_join(void);
+/*
+ * Swap bytes with slave over SPI.
+ * This function blocks execution until device isn't busy.
+ * WARNING: Invoke this only when interface is initialized in MASTER mode.
+ */
+uint8_t usi_spi_send(uint8_t data);
+/*
+ * Swaps byte with slave over SPI.
+ * This function isn't checking if device is busy, but it's not blocking execution.
+ * WARNING: Invoke this only when interface is initialized in MASTER mode.
+ */
+uint8_t usi_spi_transfer(uint8_t data);
+/*
+ * Expose data for next master request.
+ * Please don't use this when device is busy.
+ * Best place to call this is usi_spi_retrieve().
+ * WARNING: Invoke this only when interface is initialized in SLAVE mode.
+ */
+void usi_spi_expose(uint8_t data);
+
+/*
+ * This function must be defined by user.
+ * This function is called every time transfer is finished.
+ * And until return from this function interrupts are disabled.
+ * WARNING: Please define this function in your code.
+ */
+void usi_spi_receive(uint8_t data);
+
+
+#endif /* _IOE_USI_SPI_H_ */
diff --git a/include/wireless/nrf24l01p.h b/include/usi-twi.h
index e69de29..e69de29 100644
--- a/include/wireless/nrf24l01p.h
+++ b/include/usi-twi.h
diff --git a/include/utils/timers_div.h b/include/utils/timers_div.h
index 9077aac..c63c8eb 100644
--- a/include/utils/timers_div.h
+++ b/include/utils/timers_div.h
@@ -1,11 +1,6 @@
-//#include "../timer.h"
-enum timerDivider {
-    TIMER_DIVIDER_1,
-    TIMER_DIVIDER_8,
-    TIMER_DIVIDER_64,
-    TIMER_DIVIDER_256,
-    TIMER_DIVIDER_1024
-};
+#ifndef _IOE_TIMER_H_
+#error Please include time.h before timers_div.h
+#endif
 
 #ifndef TIMER_DIV_RESTIME
 #error Please define minimal time (us) before include timers_div.h in TIMER_DIV_RESTIME
diff --git a/mkdocs.yml b/mkdocs.yml
index 83ec683..02deb97 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -5,19 +5,19 @@ copyright: GNU General Public License, version 2.0
 pages:
 - Home: index.md
 - Usage: usage.md
-- Parts:
-    - IO Ports: parts/ioport.md
-    - SPI: parts/spi.md
-    - Tasks: parts/tasks.md
-    - Jobs: parts/jobs.md
-    - Timer: parts/timer.md
-    - USART: parts/usart.md
+- References:
+    - IO Ports: references/ioport.md
+    - SPI: references/spi.md
+    - Tasks: references/tasks.md
+    - Jobs: references/jobs.md
+    - Timer: references/timer.md
+    - USART: references/usart.md
     - Utils:
-        - Buffer: parts/utils/buffer.md
-        - NArray: parts/utils/narray.md
+        - Buffer: references/utils/buffer.md
+        - NArray: references/utils/narray.md
 - Adding MCU support: add_support.md
 - Miscellanoues:
-    - Jobs vs. Tasks: miscellanoues/jobs_vs_tasks.md
+    - Jobs vs. Tasks: miscelaneous/jobs_vs_tasks.md
 theme: readthedocs
 
 site_dir: html
diff --git a/src/can/mcp2515.c b/src/can/mcp2515.c
deleted file mode 100644
index 8c9915c..0000000
--- a/src/can/mcp2515.c
+++ /dev/null
@@ -1,52 +0,0 @@
-#include <can/mcp2515.h>
-
-#ifdef CONFIG_IOE_CAN_MCP2515
-// TODO check
-#define CAN_MCP2515_RESET   0xC0
-#define CAN_MCP2515_READ    0x03
-#define CAN_MCP2515_READRX  0x90
-#define CAN_MCP2515_WRITE   0x02
-#define CAN_MCP2515_LOADTX  0x40
-#define CAN_MCP2515_RTS     0x80
-#define CAN_MCP2515_RDSTAT  0xA0
-#define CAN_MCP2515_RXSTAT  0xB0
-#define CAN_MCP2515_BITMOD  0x05
-
-inline void can_mcp2515_init(canMcp2515 * can, uint8_t group, uint8_t mask) {
-    can->group = group;
-    can->mask = mask;
-    can_mcp2515_reset(can);
-    // TODO
-    return 0;
-};
-
-inline void can_mcp2515_reset(canMcp2515 * can) {
-    take_mutex(spi_mutex);
-    spi_join();
-
-    release_mutex(spi_mutex);
-};
-
-inline uint8_t can_mcp2515_read(canMcp2515 * can, uint8_t address) {
-};
-
-inline uint8_t can_mcp2515_readrx(canMcp2515 * can, uint8_t buffer) {
-};
-
-inline void can_mcp2515_write(canMcp2515 * can, uint8_t address, uint8_t data) {
-};
-
-inline void can_mcp2515_loadrx(canMcp2515 * can, uint8_t buffer, uint8_t data) {
-};
-
-inline uint8_t can_mcp2515_rdstat(canMcp2515 * can) {
-};
-
-inline uint8_t can_mcp2515_rxstat(canMcp2515 * can) {
-};
-
-inline void can_mcp2515_bitmod(canMcp2515 * can, uint8_t address, uint8_t mask,
-                        uint8_t data) {
-};
-
-#endif /* CONFIG_IOE_CAN_MCP2515 */
diff --git a/src/sensors/dht22.c b/src/sensors/dht22.c
deleted file mode 100644
index 9653ba5..0000000
--- a/src/sensors/dht22.c
+++ /dev/null
@@ -1,117 +0,0 @@
-#include <sensors/dht22.h>
-
-#ifdef CONFIG_IOE_SENSOR_DHT22
-
-#define PP dht22_ports[pi]
-#define PPP dht22_ports[dht22_measurement.pi]
-
-#define TIMEOUT F_CPU/40000
-
-#define STATUS_NONE 0
-#define STATUS_COMPLETE 1
-#define STATUS_TIMEOUT 2
-
-#define PORT_SENSORW 4
-#define PORT_SENSORRESP_L 3
-#define PORT_SENSORRESP_H 2
-#define PORT_H 1
-#define PORT_L 0
-
-struct {
-    uint8_t index;
-    uint8_t data[5];
-    volatile uint8_t status;
-    uint8_t pi;
-    uint8_t port_status;
-} dht22_measurement;
-
-inline void dht22_init(uint8_t pi) {
-    // Set port as output and set level hight
-    *(PP.DDR) |= PP.MASK;
-    *(PP.PORT) |= PP.MASK;
-    // Enable all pin change interrupts
-    PCIFR = 0xff;
-}
-
-
-inline void dht22_read_deac(uint8_t status) {
-    dht22_measurement.status = status;
-    // Disable pin change interrupt
-    *(PPP.PCMSK) &= ~PPP.PCMSK_MASK;
-    timer_disable(CONFIG_IOE_SENSOR_DHT22_TIMER);
-}
-
-// This is called from pcint.c
-void dht22_read_pcint(void) {
-    switch (dht22_measurement.port_status) {
-    case PORT_L:
-        if (!(*(PPP.PIN) & PPP.MASK))
-            return;
-        dht22_measurement.port_status = PORT_H;
-        break;
-    case PORT_H:
-        if (*(PPP.PIN) & PPP.MASK)
-            return;
-        dht22_measurement.port_status = PORT_L;
-        register uint16_t val;
-        val = timer_value(CONFIG_IOE_SENSOR_DHT22_TIMER);
-        // TODO compare value
-        if (val < 1) {
-            dht22_measurement.data[dht22_measurement.index / 8]
-        }
-        if (++(dht22_measurement.index) == 40) {
-            dht22_read_deac(STATUS_COMPLETE);
-            return;
-        }
-        break;
-    default:
-        if (((*(PPP.PIN) & PPP.MASK) && dht22_measurement.port_status == 3)
-            || !(*(PPP.PIN & PPP.MASK)))
-            return;
-        dht22_measurement.port_status--;
-    }
-    timer_reset(CONFIG_IOE_SENSOR_DHT22_TIMER);
-}
-
-void dht22_read_timer_overflow(void) {
-    dht22_read_deac(STATUS_TIMEOUT);
-}
-
-int8_t dht22_read(uint8_t pi, struct dht22_value *rh,
-                  struct dht22_value *t) {
-    dht22_measurement.index = 0;
-    dht22_measurement.status = STATUS_NONE;
-    dht22_measurement.pi = pi;
-    dht22_measurement.port_status = PORT_SENSORW;
-
-    // Pull port down for 500us
-    *(PP.PORT) &= ~PP.MASK;
-    _delay_us(500);
-    // Initialize timer
-    timer_init(CONFIG_IOE_SENSOR_DHT22_TIMER, TIMER_DIVIDER_64);
-    timer_sethook(CONFIG_IOE_SENSOR_DHT22_TIMER,
-                  dht22_read_timer_overflow);
-    // Set pin change interrupt
-    *(PP.PCMSK) |= PP.PCMSK_MASK;
-    // Set port as output and pull-up resistor
-    *(PP.DDR) &= ~PP.MASK;
-    *(PP.PORT) |= PP.MASK;
-    // Delay till reading is done
-    taskDelayTill(&(dht22_measurement.status));
-
-    // Copy data
-    rh->integral = dht22_measurement.data[0];
-    rh->decimal = dht22_measurement.data[1];
-    t->integral = dht22_measurement.data[2];
-    t->decimal = dht22_measurement.data[3];
-    // Check sum
-    uint8_t sum = dht22_measurement.data[0];
-    sum += dht22_measurement.data[1];
-    sum += dht22_measurement.data[2];
-    sum += dht22_measurement.data[3];
-    if (sum != dht22_measurement.data[4])
-        return 1;
-    return dht22_measurement.status - 1;
-}
-
-#endif /* CONFIG_IOE_SENSOR_SHT22 */
diff --git a/src/tasks.c b/src/tasks.c
index abc2add..27f8fb4 100644
--- a/src/tasks.c
+++ b/src/tasks.c
@@ -33,15 +33,6 @@ void task_stack_reg(TaskStack * ts, Task * t) {
 void task_stack_unreg(TaskStack * ts, Task * t) {
 }
 
-void init_mutex(Mutex * mtx, uint8_t flags) {
-};
-void take_mutex(Mutex * mtx) {
-};
-int8_t take_mutex_t(Mutex * mtx, uint16_t timeout) {
-};
-void give_mutex(Mutex * mtx) {
-};
-
 #else /* CONFIG_IOE_TASKS */
 
 int8_t task_delay_till(volatile int8_t * boolean, uint16_t timeout) {