Added I2C support for raspi & first rework of debugging

include/sta/bus/can/controller.hpp

@@ -12,9 +12,9 @@
  */
 
 
-#include <sta/can/filter.hpp>
+#include <sta/bus/can/filter.hpp>
-#include <sta/can/headers.hpp>
+#include <sta/bus/can/headers.hpp>
-#include <sta/can/iter.hpp>
+#include <sta/bus/can/iter.hpp>
 
 
 namespace sta

include/sta/bus/can/filter.hpp

@@ -5,7 +5,7 @@
 #ifndef STA_CORE_CAN_FILTER_HPP
 #define STA_CORE_CAN_FILTER_HPP
 
-#include <sta/can/id.hpp>
+#include <sta/bus/can/id.hpp>
 
 #include <cstdint>
 

include/sta/bus/can/headers.hpp

@@ -5,7 +5,7 @@
 #ifndef STA_CORE_CAN_HEADERS_HPP
 #define STA_CORE_CAN_HEADERS_HPP
 
-#include <sta/can/id.hpp>
+#include <sta/bus/can/id.hpp>
 
 #include <cstdint>
 

include/sta/bus/can/subscribable.hpp

@@ -5,8 +5,8 @@
 #ifndef STA_CORE_CAN_SUBSCRIBABLE_HPP
 #define STA_CORE_CAN_SUBSCRIBABLE_HPP
 
-#include <sta/can/filter.hpp>
+#include <sta/bus/can/filter.hpp>
-#include <sta/can/headers.hpp>
+#include <sta/bus/can/headers.hpp>
 
 
 namespace sta
@@ -96,7 +96,7 @@ namespace sta
 } // namespace sta
 
 
-#include <sta/can/subscribable.tpp>
+#include <sta/bus/can/subscribable.tpp>
 
 
-#endif // STA_CORE_CAN_SUBSCRIBABLE_HPP
+#endif // STA_CORE_CAN_SUBSCRIBABLE_HPP

include/sta/bus/device.hpp

@@ -1,33 +1,21 @@
-/**
+#ifndef STA_CORE_BUS_SERIAL_DEVICE_HPP
- * @file
+#define STA_CORE_BUS_SERIAL_DEVICE_HPP
- * @brief SPI bus peripheral device.
- */
-#ifndef STA_CORE_SPI_DEVICE_HPP
-#define STA_CORE_SPI_DEVICE_HPP
-
-#include <sta/gpio_pin.hpp>
-#include <sta/spi/spi.hpp>
-
-#include <cstddef>
-#include <cstdint>
 
+#include <sta/bus/interface.hpp>
 
 namespace sta
 {
     /**
-     * @brief Peripheral device connected via SPI.
+     * @brief Abstract device for serial communication.
-     *
+    */
-     * @ingroup sta_core_spi
+    class Device 
-     */
-    class SPIDevice
     {
     public:
-        /**
+         /**
          * @param intf      %SPI hardware interface
          * @param csPin     Chip select pin
          */
-        SPIDevice(SPI * intf, GpioPin * csPin);
+        Device(Interface * intf);
-
 
         /**
          * @brief Start transmission with device.
@@ -35,6 +23,7 @@ namespace sta
          * Must be called before any I/O operations.
          */
         void beginTransmission();
+
         /**
          * @brief End transmission with device.
          *
@@ -42,19 +31,20 @@ namespace sta
          */
         void endTransmission();
 
-
         /**
          * @brief Send single byte of data.
          *
          * @param value     8-bit value
          */
         void transfer(uint8_t value);
+
         /**
          * @brief Send two bytes of data.
          *
          * @param value     16-bit value
          */
         void transfer16(uint16_t value);
+
         /**
          * @brief Send data from buffer.
          *
@@ -62,6 +52,7 @@ namespace sta
          * @param size      Number of bytes to transfer
          */
         void transfer(const uint8_t * buffer, size_t size);
+
         /**
          * @brief Send and receive data simultaneously.
          *
@@ -70,6 +61,7 @@ namespace sta
          * @param size      Number of bytes to transfer
          */
         void transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size);
+
         /**
          * @brief Read incoming data to buffer.
          *
@@ -78,7 +70,6 @@ namespace sta
          */
         void receive(uint8_t * buffer, size_t size);
 
-
         /**
          * @brief Send byte value repeatedly.
          *
@@ -87,29 +78,21 @@ namespace sta
          */
         void fill(uint8_t value, size_t count);
 
+    protected:
+        /**
+         * @brief Activate device..
+         */
+        virtual void select() = 0;
 
         /**
-         * @brief Get %SPI interface settings.
+         * @brief Deactivate device..
-         *
-         * @return SPI settings
          */
-        const SPISettings & settings() const;
+        virtual void deselect() = 0;
-
-
-        /**
-         * @brief Activate device via CS pin.
-         */
-        void select();
-        /**
-         * @brief Deactivate device via CS pin.
-         */
-        void deselect();
 
     private:
-        SPI * 	    intf_;  /**< %SPI hardware interface */
+        Interface * intf_;
-        GpioPin *   csPin_; /**< Chip select pin */
+        bool    selected_ = false;
     };
 } // namespace sta
 
-
+#endif // STA_CORE_BUS_SERIAL_DEVICE_HPP
-#endif // STA_CORE_SPI_DEVICE_HPP

include/sta/bus/i2c/device.hpp

@@ -0,0 +1,37 @@
+#ifndef STA_CORE_I2C_DEVICE_HPP
+#define STA_CORE_I2C_DEVICE_HPP
+
+#include <sta/bus/i2c/i2c.hpp>
+#include <sta/bus/device.hpp>
+
+namespace sta
+{
+    /**
+     * @brief Peripheral device connected via I2c.
+     *
+     * @ingroup sta_core_i2c
+     */
+    class I2cDevice : public Device
+    {
+    public:
+        /**
+         * @param intf      %I2C hardware interface
+         * @param csPin     The peripheral's address.
+         */
+        I2cDevice(I2c * intf, int addr);
+
+    protected:
+        void select() override;
+
+        void deselect() override;
+        
+    private:
+        int addr_; /**< device address */
+    };
+    
+} // namespace sta
+
+
+
+
+#endif // STA_CORE_I2C_DEVICE_HPP

include/sta/bus/i2c/i2c.hpp

@@ -0,0 +1,33 @@
+#ifndef STA_CORE_I2C_I2C_HPP
+#define STA_CORE_I2C_I2C_HPP
+
+#include <sta/bus/interface.hpp>
+#include <sta/mutex.hpp>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace sta
+{
+    /**
+     * @brief Interface class for %I2C hardware.
+     *
+     * Represents a single %I2C bus that can be shared by multiple devices.
+     *
+     * @ingroup sta_core_i2c
+     */
+    class I2c : public Interface
+    {
+    public:
+        I2c(Mutex * mutex=nullptr);
+
+        /**
+         * @brief Address selection for the I2C bus.
+         * 
+         * @param address The address to select.
+         */
+        virtual void selectAddress(uint16_t address) = 0;
+    };
+} // namespace sta
+
+#endif // STA_CORE_I2C_I2C_HPP

include/sta/bus/interface.hpp

@@ -1,35 +1,20 @@
-/**
+#ifndef STA_CORE_BUS_SERIAL_INTERFACE_HPP
- * @file
+#define STA_CORE_BUS_SERIAL_INTERFACE_HPP
- * @brief SPI bus software interface.
- */
-#ifndef STA_CORE_SPI_SPI_HPP
-#define STA_CORE_SPI_SPI_HPP
 
 #include <sta/mutex.hpp>
-#include <sta/spi/settings.hpp>
 
-#include <cstddef>
 #include <cstdint>
-
+#include <cstddef>
 
 namespace sta
 {
     /**
-     * @brief Interface class for %SPI hardware.
+     * @brief Abstract interface for serial communication.
-     *
+    */
-     * Represents a single %SPI bus that can be shared by multiple devices.
+    class Interface
-     *
-     * @ingroup sta_core_spi
-     */
-    class SPI
     {
     public:
-        /**
+        Interface(Mutex * mutex);
-         * @param settings  %SPI bus settings
-         * @param mutex     Mutex object for managing shared access. Pass nullptr for no access control
-         */
-        SPI(const SPISettings & settings, Mutex * mutex = nullptr);
-
 
         /**
          * @brief Send single byte of data.
@@ -66,7 +51,6 @@ namespace sta
          */
         virtual void receive(uint8_t * buffer, size_t size) = 0;
 
-
         /**
          * @brief Send byte value repeatedly.
          *
@@ -75,14 +59,6 @@ namespace sta
          */
         virtual void fill(uint8_t value, size_t count) = 0;
 
-
-        /**
-         * @brief Get %SPI interface settings.
-         *
-         * @return %SPI settings
-         */
-        const SPISettings & settings();
-
         /**
          * @brief Acquire usage rights to use the interface.
          *
@@ -96,11 +72,15 @@ namespace sta
          */
         virtual void release();
 
+        /**
+         * @returns true if the interface has been aquired.
+        */
+        bool isAquired();
     private:
-        SPISettings settings_;  /**< %SPI settings */
+        Mutex * mutex_;
-        Mutex *     mutex_;	    /**< Mutex object */
+        bool    aquired_ = false;
     };
 } // namespace sta
 
 
-#endif // STA_CORE_SPI_SPI_HPP
+#endif // STA_CORE_BUS_SERIAL_INTERFACE_HPP

include/sta/bus/spi/device.hpp

@@ -0,0 +1,51 @@
+/**
+ * @file
+ * @brief SPI bus peripheral device.
+ */
+#ifndef STA_CORE_SPI_DEVICE_HPP
+#define STA_CORE_SPI_DEVICE_HPP
+
+#include <sta/bus/device.hpp>
+#include <sta/bus/spi/spi.hpp>
+#include <sta/gpio_pin.hpp>
+
+#include <cstddef>
+#include <cstdint>
+
+
+namespace sta
+{
+    /**
+     * @brief Peripheral device connected via SPI.
+     *
+     * @ingroup sta_core_spi
+     */
+    class SPIDevice : public Device
+    {
+    public:
+        /**
+         * @param intf      %SPI hardware interface
+         * @param csPin     Chip select pin
+         */
+        SPIDevice(SPI * intf, GpioPin * csPin);
+
+        /**
+         * @brief Get %SPI interface settings.
+         *
+         * @return SPI settings
+         */
+        const SPISettings & settings() const;
+
+    protected:
+        void select() override;
+
+        void deselect() override;
+
+    private:
+        SPI * 	    intf_;  /**< %SPI hardware interface */
+        GpioPin *   csPin_; /**< Chip select pin */
+    };
+} // namespace sta
+
+
+#endif // STA_CORE_SPI_DEVICE_HPP

include/sta/bus/spi/settings.hpp

@@ -5,17 +5,14 @@
 #ifndef STA_CORE_SPI_SETTINGS_HPP
 #define STA_CORE_SPI_SETTINGS_HPP
 
-
 /**
  * @defgroup sta_core_spi SPI
  * @ingroup sta_core
  * @brief SPI interface.
  */
 
-
 #include <cstdint>
 
-
 namespace sta
 {
     /**

include/sta/bus/spi/spi.hpp

@@ -0,0 +1,47 @@
+/**
+ * @file
+ * @brief SPI bus software interface.
+ */
+#ifndef STA_CORE_SPI_SPI_HPP
+#define STA_CORE_SPI_SPI_HPP
+
+#include <sta/bus/interface.hpp>
+#include <sta/bus/spi/settings.hpp>
+#include <sta/mutex.hpp>
+
+#include <cstddef>
+#include <cstdint>
+
+
+namespace sta
+{
+    /**
+     * @brief Interface class for %SPI hardware.
+     *
+     * Represents a single %SPI bus that can be shared by multiple devices.
+     *
+     * @ingroup sta_core_spi
+     */
+    class SPI : public Interface
+    {
+    public:
+        /**
+         * @param settings  %SPI bus settings
+         * @param mutex     Mutex object for managing shared access. Pass nullptr for no access control
+         */
+        SPI(const SPISettings & settings, Mutex * mutex = nullptr);
+
+        /**
+         * @brief Get %SPI interface settings.
+         *
+         * @return %SPI settings
+         */
+        const SPISettings & settings();
+
+    private:
+        SPISettings settings_;  /**< %SPI settings */
+    };
+} // namespace sta
+
+
+#endif // STA_CORE_SPI_SPI_HPP

include/sta/bus/uart/settings.hpp

@@ -0,0 +1,24 @@
+#ifndef STA_CORE_UART_SETTINGS_HPP
+#define STA_CORE_UART_SETTINGS_HPP
+
+#include <stdint.h>
+
+namespace sta
+{
+    enum class UARTMode
+    {
+        RX,
+        TX,
+        RX_TX
+    };
+
+    /**
+     * @brief %UART settings.
+     */
+    struct UARTSettings
+    {
+        UARTMode mode;
+    };
+} // namespace sta
+
+#endif // STA_CORE_UART_SETTINGS_HPP

include/sta/bus/uart/uart.hpp

@@ -0,0 +1,25 @@
+#ifndef STA_CORE_UART_UART_HPP
+#define STA_CORE_UART_UART_HPP
+
+#include <sta/bus/interface.hpp>
+#include <sta/bus/uart/settings.hpp>
+
+namespace sta
+{
+    class UART : public Interface
+    {
+    public:
+        UART(const UARTSettings & settings, Mutex * mutex=nullptr);
+
+        /**
+         * @brief Get %UART interface settings.
+         * 
+         * @return %UART settings 
+         */
+        const UARTSettings & settings();
+    private:
+        UARTSettings settings_;  /**< %UART settings */
+    };
+} // namespace sta
+
+#endif // STA_CORE_UART_UART_HPP

include/sta/config.hpp

@@ -2,7 +2,7 @@
 #define STA_CONFIG
 
 // Use the raspberry pi for this project.
-#include <sta/raspi/mcu/common.hpp>
+#include <sta/devices/raspi/mcu/common.hpp>
 
 // #define DEBUG
 #define STA_PRINTF_USE_STDLIB

include/sta/devices/raspi/bus/i2c.hpp

@@ -0,0 +1,52 @@
+#ifndef STA_RASPI_I2C_HPP
+#define STA_RASPI_I2C_HPP
+
+#include <sta/config.hpp>
+#ifdef STA_PLATFORM_RASPI
+
+#include <sta/bus/i2c/i2c.hpp>
+#include <sta/bus/i2c/device.hpp>
+
+#include <linux/i2c-dev.h>
+#include <sys/ioctl.h>
+
+namespace sta 
+{
+    enum class I2cNode {
+        DEV_1,
+        DEV_2
+    };
+
+    class RaspiI2c : public I2c 
+    {
+    public:
+        RaspiI2c(I2cNode node, Mutex * mutex=nullptr, bool persistent_open=false);
+        ~RaspiI2c();
+
+        void transfer(uint8_t value) override;
+        void transfer16(uint16_t value) override;
+        void transfer(const uint8_t * buffer, size_t size) override;
+        void transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size) override;
+        void receive(uint8_t * buffer, size_t size) override;
+
+        void fill(uint8_t value, size_t count) override;
+
+        void selectAddress(uint16_t address) override; 
+        void acquire() override;
+        void release() override;
+    private:
+        char * i2cdev_;
+        int i2cfd_;
+        bool open_ = false;
+        const bool persistent_open_;
+    };
+
+    class RaspiI2cDevice : public I2cDevice
+    {
+        RaspiI2cDevice(I2c * intf, uint16_t address_10bit, Mutex* mutex=nullptr, bool master=false, bool blocking=true);
+    };
+} // namespace sta
+
+#endif // STA_PLATFORM_RASPI
+
+#endif // STA_I2C_HPP

include/sta/devices/raspi/bus/spi.hpp

@@ -4,8 +4,8 @@
 #include <sta/config.hpp>
 #ifdef STA_PLATFORM_RASPI
 
-#include <sta/spi/device.hpp>
+#include <sta/bus/spi/device.hpp>
-#include <sta/spi/spi.hpp>
+#include <sta/bus/spi/spi.hpp>
 
 namespace sta 
 {

include/sta/devices/raspi/gpio_pin.hpp

@@ -4,7 +4,7 @@
 // Only enable module on Raspi platform w/ HAL GPIO module enabled
 #include <sta/config.hpp>
 #ifdef STA_PLATFORM_RASPI
-#   include <sta/raspi/hal.hpp>
+#   include <sta/devices/raspi/hal.hpp>
 #   define STA_RASPI_GPIO_ENABLED
 #endif // STA_PLATFORM_RASPI
 

include/sta/devices/template/delay.hpp

@@ -0,0 +1,43 @@
+/**
+ * @file delay.hpp
+ * @author <your name> (<you>@<your_domain>.com)
+ * @brief 
+ * @version 0.1
+ * @date 2023-06-13
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * How to modify this file:
+ * - Ctrl + F and replace "YOUR_DEVICE" with the appropriate name.
+ */
+#ifndef STA_CORE_YOUR_DEVICE_DELAY_HPP
+#define STA_CORE_YOUR_DEVICE_DELAY_HPP
+
+// Only enable module on YOUR_DEVICE platform
+#include <sta/config.hpp>
+
+
+#if defined(STA_PLATFORM_YOUR_DEVICE) || defined(DOXYGEN)
+
+#include <cstdint>
+
+namespace sta
+{
+    /**
+     * @brief Millisecond delay.
+     *
+     * @param ms    Milliseconds
+     */
+    void delayMs(uint32_t ms);
+
+    /**
+     * @brief Microsecond delay.
+     *
+     * @param us    Microseconds
+     */
+    void delayUs(uint32_t us);
+} // namespace sta
+
+#endif // STA_PLATFORM_YOUR_DEVICE
+
+#endif // STA_CORE_YOUR_DEVICE_DELAY_HPP

include/sta/i2c.hpp

@@ -1,27 +0,0 @@
-#ifndef STA_I2C_HPP
-#define STA_I2C_HPP
-
-#include <cstdint>
-#include <sta/mutex.hpp>
-
-namespace sta {
-    class I2cDevice {
-    protected:
-        uint16_t address;
-        Mutex* mutex;
-        bool master;
-        bool blocking;
-    public:
-        I2cDevice(uint16_t address_10bit, Mutex* mutex=nullptr, bool master=false, bool blocking=true);
-
-        virtual bool transmit(uint8_t* data, uint16_t size) = 0;
-
-        virtual bool receive(uint8_t* data, uint16_t size) = 0;
-
-        virtual void acquire();
-
-        virtual void release();
-    };
-}
-
-#endif // STA_I2C_HPP

include/sta/lang.hpp

@@ -95,6 +95,14 @@
 #  define STA_UNREACHABLE() __builtin_unreachable()
 #endif // !STA_UNREACHABLE
 
+/**
+ * @brief A macro for marking code as not implemented. Causes a program to
+ * crash with the appropriate error message if the code is executed.
+ */
+#ifndef STA_NOT_IMPLEMENTED
+#  define STA_NOT_IMPLEMENTED() throw "myFunction is not implemented yet.";
+#endif // !STA_NOT_IMPLEMENTED
+
 /**
  * @brief Silencing compiler warnings for intended switch case fallthrough.
  *

include/sta/printable.hpp

@@ -5,8 +5,6 @@
 #ifndef STA_CORE_PRINTABLE_HPP
 #define STA_CORE_PRINTABLE_HPP
 
-#include <sta/printf.hpp>
-
 #include <cstddef>
 #include <cstdint>
 
@@ -25,165 +23,168 @@ namespace sta
         HEX     /**< Hexadecimal */
     };
 
-    /**
+    class Printable
-     * @brief Print single character.
+    {
-     *
+        /**
-     * @param c     Character to print
+         * @brief Print single character.
-     */
+         *
-    void print(char c);
+         * @param c     Character to print
+         */
+        void print(char c);
 
-    /**
+        /**
-     * @brief Print boolean value.
+         * @brief Print boolean value.
-     *
+         *
-     * @param b     Boolean value
+         * @param b     Boolean value
-     */
+         */
-    void print(bool b);
+        void print(bool b);
 
-    /**
+        /**
-     * @brief Print floating point value.
+         * @brief Print floating point value.
-     *
+         *
-     * @param d     Floating point value
+         * @param d     Floating point value
-     */
+         */
-    void print(double d);
+        void print(double d);
 
-    /**
+        /**
-     * @brief Print integer in selected base.
+         * @brief Print integer in selected base.
-     *
+         *
-     * @param num   8-bit unsigned integer
+         * @param num   8-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void print(uint8_t num, IntegerBase base = IntegerBase::DEC);
+        void print(uint8_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print integer in selected base.
+         * @brief Print integer in selected base.
-     *
+         *
-     * @param num   16-bit unsigned integer
+         * @param num   16-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void print(uint16_t num, IntegerBase base = IntegerBase::DEC);
+        void print(uint16_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print integer in selected base.
+         * @brief Print integer in selected base.
-     *
+         *
-     * @param num   32-bit unsigned integer
+         * @param num   32-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void print(uint32_t num, IntegerBase base = IntegerBase::DEC);
+        void print(uint32_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print c-string.
+         * @brief Print c-string.
-     *
+         *
-     * @param str   Null terminated string
+         * @param str   Null terminated string
-     */
+         */
-    void print(const char * str);
+        void print(const char * str);
 
-    /**
+        /**
-     * @brief Print string.
+         * @brief Print string.
-     *
+         *
-     * @param str       String buffer
+         * @param str       String buffer
-     * @param length    String length
+         * @param length    String length
-     */
+         */
-    void print(const char * str, size_t length);
+        virtual void print(const char * str, size_t length) = 0;
 
-    /**
+        /**
-     * @brief Print new-line.
+         * @brief Print new-line.
-     */
+         */
-    void println();
+        void println();
 
-    /**
+        /**
-     * @brief Print single character followed by a new-line.
+         * @brief Print single character followed by a new-line.
-     *
+         *
-     * @param c     Character to print
+         * @param c     Character to print
-     */
+         */
-    void println(char c);
+        void println(char c);
 
-    /**
+        /**
-     * @brief Print boolean value followed by a new-line.
+         * @brief Print boolean value followed by a new-line.
-     *
+         *
-     * @param b     Boolean value
+         * @param b     Boolean value
-     */
+         */
-    void println(bool b);
+        void println(bool b);
 
-    /**
+        /**
-     * @brief Print floating point value followed by a new-line.
+         * @brief Print floating point value followed by a new-line.
-     *
+         *
-     * @param d     Floating point value
+         * @param d     Floating point value
-     */
+         */
-    void println(double d);
+        void println(double d);
 
-    /**
+        /**
-     * @brief Print integer in selected base followed by a new-line.
+         * @brief Print integer in selected base followed by a new-line.
-     *
+         *
-     * @param num   8-bit unsigned integer
+         * @param num   8-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void println(uint8_t num, IntegerBase base = IntegerBase::DEC);
+        void println(uint8_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print integer in selected base followed by a new-line.
+         * @brief Print integer in selected base followed by a new-line.
-     *
+         *
-     * @param num   16-bit unsigned integer
+         * @param num   16-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void println(uint16_t num, IntegerBase base = IntegerBase::DEC);
+        void println(uint16_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print integer in selected base followed by a new-line.
+         * @brief Print integer in selected base followed by a new-line.
-     *
+         *
-     * @param num   32-bit unsigned integer
+         * @param num   32-bit unsigned integer
-     * @param base  Integer base
+         * @param base  Integer base
-     */
+         */
-    void println(uint32_t num, IntegerBase base = IntegerBase::DEC);
+        void println(uint32_t num, IntegerBase base = IntegerBase::DEC);
 
-    /**
+        /**
-     * @brief Print c-string followed by a new-line.
+         * @brief Print c-string followed by a new-line.
-     *
+         *
-     * @param str   Null terminated string
+         * @param str   Null terminated string
-     */
+         */
-    void println(const char * str);
+        void println(const char * str);
 
-    /**
+        /**
-     * @brief Print string followed by a new-line.
+         * @brief Print string followed by a new-line.
-     *
+         *
-     * @param str       String buffer
+         * @param str       String buffer
-     * @param length    String length
+         * @param length    String length
-     */
+         */
-    void println(const char * str, size_t length);
+        void println(const char * str, size_t length);
 
-    /**
+    private:
-     * @brief Print unsigned integer in selected base.
+        /**
-     *
+         * @brief Print unsigned integer in selected base.
-     * @param value     Unsigned integer value
+         *
-     * @param base      Integer base
+         * @param value     Unsigned integer value
-     * @param fmt       printf format string for base 10
+         * @param base      Integer base
-     * @param size      Size of value in bytes
+         * @param fmt       printf format string for base 10
-     */
+         * @param size      Size of value in bytes
-    void printBase(uintmax_t value, IntegerBase base, const char * fmt, size_t size);
+         */
+        void printBase(uintmax_t value, IntegerBase base, const char * fmt, size_t size);
 
-    /**
+        /**
-     * @brief Print unsigned integer in base 10.
+         * @brief Print unsigned integer in base 10.
-     *
+         *
-     * @param value     Unsigned integer value
+         * @param value     Unsigned integer value
-     * @param fmt       printf format string
+         * @param fmt       printf format string
-     */
+         */
-    void printDec(uintmax_t value, const char * fmt);
+        void printDec(uintmax_t value, const char * fmt);
 
-    /**
+        /**
-     * @brief Print unsigned integer in base 2.
+         * @brief Print unsigned integer in base 2.
-     *
+         *
-     * @param value     Unsigned integer value
+         * @param value     Unsigned integer value
-     * @param digits    Number of digits to print
+         * @param digits    Number of digits to print
-     */
+         */
-    void printBin(uintmax_t value, size_t digits);
+        void printBin(uintmax_t value, size_t digits);
-
-    /**
-     * @brief Print unsigned integer in base 16.
-     *
-     * @param value     Unsigned integer value
-     * @param digits    Number of digits to print
-     */
-    void printHex(uintmax_t value, size_t digits);
 
+        /**
+         * @brief Print unsigned integer in base 16.
+         *
+         * @param value     Unsigned integer value
+         * @param digits    Number of digits to print
+         */
+        void printHex(uintmax_t value, size_t digits);
+    };
 } // namespace sta
 
 

include/sta/printable_uart.hpp

@@ -5,7 +5,8 @@
 #ifndef STA_CORE_PRINTABLE_UART_HPP
 #define STA_CORE_PRINTABLE_UART_HPP
 
-#include <sta/uart.hpp>
+#include <sta/bus/uart/uart.hpp>
+#include <sta/printable.hpp>
 
 #include <cstddef>
 #include <cstdint>
@@ -13,24 +14,12 @@
 
 namespace sta
 {
-    /**
-     * @brief Integer representation.
-     *
-     * @ingroup sta_core
-     */
-    enum class IntegerBase
-    {
-        DEC,    /**< Decimal */
-        BIN,    /**< Binary */
-        HEX     /**< Hexadecimal */
-    };
-
     /**
      * @brief Printable interface for UART.
      *
      * @ingroup sta_core
      */
-    class PrintableUART
+    class PrintableUART : public Printable
     {
     public:
         /**
@@ -38,149 +27,14 @@ namespace sta
          */
         PrintableUART(UART * intf);
 
-        /**
-         * @brief Print single character.
-         *
-         * @param c     Character to print
-         */
-        void print(char c);
-        /**
-         * @brief Print boolean value.
-         *
-         * @param b     Boolean value
-         */
-        void print(bool b);
-        /**
-         * @brief Print floating point value.
-         *
-         * @param d     Floating point value
-         */
-        void print(double d);
-        /**
-         * @brief Print integer in selected base.
-         *
-         * @param num   8-bit unsigned integer
-         * @param base  Integer base
-         */
-        void print(uint8_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print integer in selected base.
-         *
-         * @param num   16-bit unsigned integer
-         * @param base  Integer base
-         */
-        void print(uint16_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print integer in selected base.
-         *
-         * @param num   32-bit unsigned integer
-         * @param base  Integer base
-         */
-        void print(uint32_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print c-string.
-         *
-         * @param str   Null terminated string
-         */
-        void print(const char * str);
         /**
          * @brief Print string.
          *
          * @param str       String buffer
          * @param length    String length
          */
-        void print(const char * str, size_t length);
+        void print(const char * str, size_t length) override;
-
+        
-
-        /**
-         * @brief Print new-line.
-         */
-        void println();
-        /**
-         * @brief Print single character followed by a new-line.
-         *
-         * @param c     Character to print
-         */
-        void println(char c);
-        /**
-         * @brief Print boolean value followed by a new-line.
-         *
-         * @param b     Boolean value
-         */
-        void println(bool b);
-        /**
-         * @brief Print floating point value followed by a new-line.
-         *
-         * @param d     Floating point value
-         */
-        void println(double d);
-        /**
-         * @brief Print integer in selected base followed by a new-line.
-         *
-         * @param num   8-bit unsigned integer
-         * @param base  Integer base
-         */
-        void println(uint8_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print integer in selected base followed by a new-line.
-         *
-         * @param num   16-bit unsigned integer
-         * @param base  Integer base
-         */
-        void println(uint16_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print integer in selected base followed by a new-line.
-         *
-         * @param num   32-bit unsigned integer
-         * @param base  Integer base
-         */
-        void println(uint32_t num, IntegerBase base = IntegerBase::DEC);
-        /**
-         * @brief Print c-string followed by a new-line.
-         *
-         * @param str   Null terminated string
-         */
-        void println(const char * str);
-        /**
-         * @brief Print string followed by a new-line.
-         *
-         * @param str       String buffer
-         * @param length    String length
-         */
-        void println(const char * str, size_t length);
-
-    private:
-        /**
-         * @brief Print unsigned integer in selected base.
-         *
-         * @param value     Unsigned integer value
-         * @param base      Integer base
-         * @param fmt       printf format string for base 10
-         * @param size      Size of value in bytes
-         */
-        void printBase(uintmax_t value, IntegerBase base, const char * fmt, size_t size);
-        /**
-         * @brief Print unsigned integer in base 10.
-         *
-         * @param value     Unsigned integer value
-         * @param fmt       printf format string
-         */
-        void printDec(uintmax_t value, const char * fmt);
-        /**
-         * @brief Print unsigned integer in base 2.
-         *
-         * @param value     Unsigned integer value
-         * @param digits    Number of digits to print
-         */
-        void printBin(uintmax_t value, size_t digits);
-        /**
-         * @brief Print unsigned integer in base 16.
-         *
-         * @param value     Unsigned integer value
-         * @param digits    Number of digits to print
-         */
-        void printHex(uintmax_t value, size_t digits);
-
     private:
         UART * intf_;
     };

include/sta/uart.hpp

@@ -19,10 +19,10 @@
 namespace sta
 {
     /**
-        * @brief Interface for %UART.
+    * @brief Interface for %UART.
-        *
+    *
-        * @ingroup sta_core_uart
+    * @ingroup sta_core_uart
-        */
+    */
     class UART
     {
     public:
@@ -40,12 +40,14 @@ namespace sta
          * @param value     Unsigned integer value
          */
         void write(uint8_t value);
+
         /**
          * @brief Write unsigned integer to %UART.
          *
          * @param value     Unsigned integer value
          */
         void write(uint16_t value);
+        
         /**
          * @brief Write unsigned integer to %UART.
          *

src/bus/device.cpp

@@ -0,0 +1,77 @@
+#include <sta/bus/device.hpp>
+#include <sta/assert.hpp>
+
+namespace sta
+{
+    Device::Device(Interface * intf)
+        : intf_{intf}
+    {
+        STA_ASSERT(intf != nullptr);
+    }
+
+    void Device::beginTransmission()
+    {
+        intf_->acquire();
+        select();
+        selected_ = true;
+    }
+
+    void Device::endTransmission()
+    {
+        deselect();
+        selected_ = false;
+        intf_->release();
+    }
+
+    void Device::transfer(uint8_t value)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+
+        intf_->transfer(value);
+    }
+
+    void Device::transfer16(uint16_t value)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+
+        intf_->transfer16(value);
+    }
+
+    void Device::transfer(const uint8_t * buffer, size_t size)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+        STA_ASSERT(buffer != nullptr);
+
+        intf_->transfer(buffer, size);
+    }
+
+    void Device::transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+        STA_ASSERT(txBuffer != nullptr);
+        STA_ASSERT(rxBuffer != nullptr);
+
+        intf_->transfer(txBuffer, rxBuffer, size);
+    }
+
+    void Device::receive(uint8_t * buffer, size_t size)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+        STA_ASSERT(buffer != nullptr);
+
+        intf_->receive(buffer, size);
+    }
+
+    void Device::fill(uint8_t value, size_t count)
+    {
+        STA_ASSERT(intf_->isAquired());
+        STA_ASSERT(selected_);
+
+        intf_->fill(value, count);
+    }
+} // namespace sta

src/bus/i2c/device.cpp

@@ -0,0 +1,23 @@
+#include <sta/bus/i2c/device.hpp>
+
+#include <sta/assert.hpp>
+
+
+namespace sta
+{
+    I2cDevice::I2cDevice(I2c * intf, int addr) 
+        : Device{intf}, addr_{addr}
+    {
+        STA_ASSERT(intf != nullptr);
+    }
+
+    void I2cDevice::select()
+    {
+        // TODO: Implement address selection here?
+    }
+
+    void I2cDevice::deselect()
+    {
+        // TODO: Implement address deselection here?
+    }
+} // namespace sta

src/bus/i2c/i2c.cpp

@@ -0,0 +1,11 @@
+#include <sta/bus/i2c/i2c.hpp>
+
+
+namespace sta 
+{
+    I2c::I2c(Mutex * mutex=nullptr) 
+        : Interface{mutex}
+    {
+
+    }
+} // namespace sta

src/bus/interface.cpp

@@ -0,0 +1,29 @@
+#include <sta/bus/interface.hpp>
+
+#include <sta/assert.hpp>
+
+namespace sta
+{
+    Interface::Interface(Mutex * mutex)
+        : mutex_{mutex}
+    {
+        STA_ASSERT(mutex != nullptr);
+    }
+
+    void Interface::acquire()
+    {
+        if (mutex_ != nullptr)
+            mutex_->acquire();
+    }
+
+    void Interface::release()
+    {
+        if (mutex_ != nullptr)
+            mutex_->release();
+    }
+
+    bool Interface::isAquired()
+    {
+        return aquired_;
+    }
+} // namespace sta

src/bus/spi/device.cpp

@@ -0,0 +1,29 @@
+#include <sta/bus/spi/device.hpp>
+
+#include <sta/assert.hpp>
+
+
+namespace sta
+{
+    SPIDevice::SPIDevice(SPI * intf, GpioPin * csPin)
+        : Device{intf}, intf_{intf}, csPin_{csPin}
+    {
+        STA_ASSERT(intf != nullptr);
+        STA_ASSERT(csPin != nullptr);
+    }
+
+    const SPISettings & SPIDevice::settings() const
+    {
+        return intf_->settings();
+    }
+
+    void SPIDevice::select()
+    {
+        csPin_->setState(GpioPinState::GPIO_LOW);
+    }
+
+    void SPIDevice::deselect()
+    {
+        csPin_->setState(GpioPinState::GPIO_HIGH);
+    }
+} // namespace sta

src/bus/spi/settings.cpp

@@ -1,4 +1,4 @@
-#include <sta/spi/settings.hpp>
+#include <sta/bus/spi/settings.hpp>
 
 #include <sta/assert.hpp>
 #include <sta/lang.hpp>

src/bus/spi/spi.cpp

@@ -0,0 +1,17 @@
+#include <sta/bus/spi/spi.hpp>
+
+#include <cstdio>
+
+namespace sta
+{
+    SPI::SPI(const SPISettings & settings, Mutex * mutex /* = nullptr */)
+        : Interface{mutex}, settings_{settings}
+    {
+        
+    }
+
+    const SPISettings & SPI::settings()
+    {
+        return settings_;
+    }
+} // namespace sta

src/bus/uart/uart.cpp

@@ -0,0 +1,15 @@
+#include <sta/bus/uart/uart.hpp>
+
+namespace sta
+{
+    UART::UART(const UARTSettings & settings, Mutex * mutex)
+        : Interface{mutex}, settings_{settings}
+    {
+        
+    }
+
+    const UARTSettings & UART::settings()
+    {
+        return settings_;
+    }
+} // namespace sta

src/devices/raspi/bus/i2c/i2c.cpp

@@ -0,0 +1,129 @@
+#include <sta/devices/raspi/bus/i2c.hpp>
+
+#ifdef STA_PLATFORM_RASPI
+
+#include <sta/assert.hpp>
+
+#include <cstdlib>
+#include <string.h>
+#include <iostream>
+
+#include <linux/i2c-dev.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+
+namespace sta 
+{
+    RaspiI2c::RaspiI2c(I2cNode node, Mutex * mutex, bool persistent_open)
+        : I2c{mutex}, persistent_open_{persistent_open}
+    {
+        // Safer version of malloc + strcpy
+        i2cdev_ = strdup(node == I2cNode::DEV_1 ? "/dev/i2c-1" : "/dev/i2c-2");
+
+        STA_ASSERT(i2cdev_ != nullptr);
+    }
+
+    RaspiI2c::~RaspiI2c()
+    {
+        if (i2cdev_ != NULL ) {
+            free(i2cdev_);
+	        i2cdev_ = NULL;
+        }
+        
+        if (open_) {
+            close(i2cfd_);
+        }
+    }
+
+    void RaspiI2c::transfer(uint8_t value)
+    {
+        STA_ASSERT(open_);
+
+        write(i2cfd_, &value, 1);
+    }
+
+    void RaspiI2c::transfer16(uint16_t value)
+    {
+        STA_ASSERT(open_);
+
+        write(i2cfd_, &value, 2);
+    }
+
+    void RaspiI2c::transfer(const uint8_t * buffer, size_t size)
+    {
+        STA_ASSERT(open_);
+
+        write(i2cfd_, buffer, size);
+    }
+
+    void RaspiI2c::transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size)
+    {
+        STA_ASSERT(open_);
+
+        // TODO: Is this even possible in i2c?
+    }
+
+    void RaspiI2c::receive(uint8_t * buffer, size_t size)
+    {
+        STA_ASSERT(open_);
+
+        if (read(i2cfd_, buffer, size) <= 0)
+        {
+            printf("Error while reading i2c bus.");
+        }
+    }
+
+    void RaspiI2c::fill(uint8_t value, size_t count) 
+    {
+        STA_ASSERT(open_);
+
+        // Initialize a buffer of size count and fill it with the value.
+        uint8_t *buffer = new uint8_t[count];
+        memset(buffer, value, count);
+
+        write(i2cfd_, buffer, count);
+
+        delete [] buffer; 
+    }
+
+    void RaspiI2c::selectAddress(uint16_t address)
+    {
+        if (ioctl(i2cfd_, I2C_SLAVE, address) < 0)
+        {
+            printf("Failed to send the slave address.");
+        }
+    }
+
+    void RaspiI2c::acquire()
+    {
+        I2c::acquire();
+
+        if (open_) {
+            return;
+        }
+
+        i2cfd_ = open(i2cdev_, O_RDWR);
+        open_ = true;
+
+        STA_ASSERT(i2cfd_ >= 0);
+    }
+
+    void RaspiI2c::release()
+    {
+        if (!persistent_open_ && open_) {
+            close(i2cfd_);
+        }
+
+        I2c::release();
+    }
+
+    RaspiI2cDevice::RaspiI2cDevice(I2c * intf, uint16_t address_10bit, Mutex* mutex, bool master, bool blocking) 
+        : I2cDevice { intf, address_10bit }
+    {
+        
+    }
+} // namespace sta
+
+#endif // STA_PLATFORM_RASPI

src/devices/raspi/bus/spi/spi.cpp

@@ -1,9 +1,9 @@
-#include <sta/raspi/spi.hpp>
+#include <sta/devices/raspi/bus/spi.hpp>
 
 #ifdef STA_PLATFORM_RASPI
 
-#include <sta/raspi/gpio_pin.hpp>
+#include <sta/devices/raspi/gpio_pin.hpp>
-#include <sta/spi/settings.hpp>
+#include <sta/bus/spi/settings.hpp>
 #include <sta/assert.hpp>
 #include <sta/endian.hpp>
 #include <sta/lang.hpp>
@@ -94,6 +94,10 @@ namespace sta
 
         int result = ioctl(spifd_, SPI_IOC_MESSAGE(1), spi_message);
 
+        if (result < 0) {
+            printf("Sending failed with error '%s'! \n", strerror(errno));
+        }
+
         STA_DEBUG_IOCTL_SEND(result);
     }
 
@@ -293,8 +297,6 @@ namespace sta
 
     void RaspiSPI::release()
     {
-        STA_ASSERT_MSG(open_, "'release' was called despite the device being closed! This has to be a bug!");
-
         if (!persistent_open_ && open_) {
             close(spifd_);
         }

src/devices/raspi/delay.cpp

@@ -1,7 +1,7 @@
-#include <sta/raspi/delay.hpp>
+#include <sta/devices/raspi/delay.hpp>
 #ifdef STA_PLATFORM_RASPI
 
-#include <sta/raspi/hal.hpp>
+#include <sta/devices/raspi/hal.hpp>
 
 #include <sta/assert.hpp>
 #include <sta/lang.hpp>

src/devices/stm32/uart.cpp

@@ -1,4 +1,4 @@
-#include <sta/stm32/uart.hpp>
+#include <sta/devices/stm32/uart.hpp>
 #ifdef STA_STM32_UART_ENABLED
 
 #include <sta/assert.hpp>

src/devices/template/delay.cpp

@@ -0,0 +1,36 @@
+/**
+ * @file delay.cpp
+ * @author <your name> (<you>@<your_domain>.com)
+ * @brief 
+ * @version 0.1
+ * @date 2023-06-13
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * How to modify this file:
+ * - Ctrl + F and replace "YOUR_DEVICE" with the appropriate name.
+ * - Implement the functions delayMs and delayUs.
+ * - Remove the <sta/lang.hpp> import if no longer needed.
+ */
+
+#define STA_PLATFORM_YOUR_DEVICE
+
+#include <sta/devices/template/delay.hpp>
+#ifdef STA_PLATFORM_YOUR_DEVICE
+
+#include <sta/lang.hpp>
+
+namespace sta
+{
+    void delayMs(uint32_t ms)
+    {
+        STA_NOT_IMPLEMENTED();
+    }
+
+    void delayUs(uint32_t us)
+    {
+        STA_NOT_IMPLEMENTED();
+    }
+} // namespace sta
+
+#endif // STA_PLATFORM_YOUR_DEVICE

src/i2c.cpp

@@ -1,22 +0,0 @@
-#include <sta/i2c.hpp>
-
-namespace sta {
-    I2cDevice::I2cDevice(uint16_t address_7bit, Mutex* mutex, bool master, bool blocking) {
-        this->address = address_7bit << 1;
-        this->mutex = mutex;
-        this->master = master;
-        this->blocking = blocking;
-    }
-
-    void I2cDevice::acquire() {
-        if (this->mutex != nullptr) {
-            mutex->acquire();
-        }
-    }
-
-    void I2cDevice::release() {
-        if (this->mutex != nullptr) {
-            mutex->release();
-        }
-    }
-}

src/printable.cpp

@@ -2,136 +2,184 @@
 
 #include <cinttypes>
 #include <cstring>
+#include <cstdio>
+
 #include <sta/assert.hpp>
 #include <sta/lang.hpp>
 
 namespace sta 
 {
-    void print(char c)
+    void Printable::print(char c)
     {
         print(&c, 1);
     }
 
-    void print(bool b)
+    void Printable::print(bool b)
     {
         print(b ? "true" : "false");
     }
 
-    void print(double d)
+    void Printable::print(double d)
     {
         char buffer[64];
         snprintf(buffer, sizeof(buffer), "%f", d);
         print(buffer);
     }
 
-    void print(uint8_t num, IntegerBase base)
+    void Printable::print(uint8_t num, IntegerBase base)
     {
         printBase(num, base, "%" PRIu8, sizeof(num));
     }
 
-    void print(uint16_t num, IntegerBase base)
+    void Printable::print(uint16_t num, IntegerBase base)
     {
         printBase(num, base, "%" PRIu16, sizeof(num));
     }
 
-    void print(uint32_t num, IntegerBase base)
+    void Printable::print(uint32_t num, IntegerBase base)
     {
         printBase(num, base, "%" PRIu32, sizeof(num));
     }
 
-    void print(const char * str)
+    void Printable::print(const char * str)
     {
         print(str, strlen(str));
     }
-
+    
-    void print(const char * str, size_t length) {
+    void Printable::println()
-        print(str, length);
-    }
-
-    void println()
     {
         print("\r\n", 2);
     }
 
-    void println(char c)
+    void Printable::println(char c)
     {
         print(&c, 1);
         println();
     }
 
-    void println(bool b)
+    void Printable::println(bool b)
     {
         print(b);
         println();
     }
 
-    void println(double d)
+    void Printable::println(double d)
     {
         print(d);
         println();
     }
 
-    void println(uint8_t num, IntegerBase base)
+    void Printable::println(uint8_t num, IntegerBase base)
     {
         print(num, base);
         println();
     }
 
-    void println(uint16_t num, IntegerBase base)
+    void Printable::println(uint16_t num, IntegerBase base)
     {
         print(num, base);
         println();
     }
 
-    void println(uint32_t num, IntegerBase base)
+    void Printable::println(uint32_t num, IntegerBase base)
     {
         print(num, base);
         println();
     }
 
-    void println(const char * str)
+    void Printable::println(const char * str)
     {
         println(str, strlen(str));
     }
 
-    void println(const char * str, size_t length)
+    void Printable::println(const char * str, size_t length)
     {
         print(str, length);
         println();
     }
 
-    void printBase(uintmax_t value, IntegerBase base, const char * fmt, size_t size)
+    void Printable::printBase(uintmax_t num, IntegerBase base, const char * fmt, size_t size)
     {
         switch (base)
         {
         case IntegerBase::DEC:
-            printDec(value, fmt);
+            printDec(num, fmt);
-            break;
-        case IntegerBase::HEX:
-            printHex(value, size);
             break;
+
         case IntegerBase::BIN:
-            printBin(value, size);
+            // Digits in base 2 = size in bytes * 8
+            printBin(num, size * 8);
             break;
+
+        case IntegerBase::HEX:
+            // Digits in base 16 = size in bytes * 2
+            printHex(num, size * 2);
+            break;
+
         default:
-            STA_ASSERT_MSG(false, "Case for IntegerBase enum not handled");
+            print("<invalid_base>");
-            STA_UNREACHABLE();
         }
     }
 
-    void printDec(uintmax_t value, const char * fmt)
+    void Printable::printDec(uintmax_t num, const char * fmt)
     {
-        printf(fmt, value);
+        char buffer[64];
+        snprintf(buffer, sizeof(buffer), fmt, static_cast<uint32_t>(num));
+        print(buffer);
     }
 
-    void printBin(uintmax_t value, size_t digits)
+    void Printable::printBin(uintmax_t value, size_t digits)
     {
+        // Need 8 digits for every byte
+        char buffer[sizeof(value) * 8];
 
+        // Check bounds
+        if (digits > sizeof(buffer))
+        {
+            print("<bin_value_too_big>");
+            return;
+        }
+        // Nothing to do
+        if (digits == 0)
+            return;
+
+        for (size_t i = 0; i < digits; ++i)
+        {
+            // Convert bit to '0' or '1'
+            // First digit in buffer is MSB in value, so shift from high to low
+            buffer[i] = '0' + ((value >> (digits - 1 - i)) & 0x1);
+        }
+
+        print(buffer, digits);
     }
 
-    void printHex(uintmax_t value, size_t digits)
+    void Printable::printHex(uintmax_t value, size_t digits)
     {
-        printf("%x", value);
+        // Need 2 digits for every byte
+        char buffer[sizeof(value) * 2];
+
+        // Check bounds
+        if (digits > sizeof(buffer))
+        {
+            print("<hex_value_too_big>");
+            return;
+        }
+        // Nothing to do
+        if (digits == 0)
+            return;
+
+        for (size_t i = 0; i < digits; ++i)
+        {
+            // Convert 4 bits to hex
+            // First digit in buffer is 4 MSBs in value, so shift from high to low
+            uint8_t hex = ((value >> ((digits - 1 - i) * 4)) & 0xF);
+            if (hex > 9)
+                buffer[i] = 'A' + (hex - 10);
+            else
+                buffer[i] = '0' + hex;
+        }
+
+        print(buffer, digits);
     }
 
 } // namespace sta

src/printable_uart.cpp

@@ -7,194 +7,19 @@
 #include <cstring>
 
 
-
 namespace sta
 {
+    
     PrintableUART::PrintableUART(UART * intf)
         : intf_{intf}
     {
         STA_ASSERT(intf != nullptr);
-    }
+        STA_ASSERT(intf->settings().mode == UARTMode::RX || intf->settings().mode == UARTMode::RX_TX);
-
-
-    void PrintableUART::print(char c)
-    {
-        print(&c, 1);
-    }
-
-    void PrintableUART::print(bool b)
-    {
-        print(b ? "true" : "false");
-    }
-
-    void PrintableUART::print(double d)
-    {
-        char buffer[64];
-        snprintf(buffer, sizeof(buffer), "%f", d);
-        print(buffer);
-    }
-
-    void PrintableUART::print(uint8_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        printBase(num, base, "%" PRIu8, sizeof(num));
-    }
-
-    void PrintableUART::print(uint16_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        printBase(num, base, "%" PRIu16, sizeof(num));
-    }
-
-    void PrintableUART::print(uint32_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        printBase(num, base, "%" PRIu32, sizeof(num));
-    }
-
-    void PrintableUART::print(const char * str)
-    {
-        print(str, strlen(str));
     }
 
     void PrintableUART::print(const char * str, size_t length)
     {
-        intf_->write(reinterpret_cast<const uint8_t *>(str), length);
+        intf_->transfer(reinterpret_cast<const uint8_t *>(str), length);
     }
 
-
-    void PrintableUART::println()
-    {
-        print("\r\n", 2);
-    }
-
-    void PrintableUART::println(char c)
-    {
-        print(&c, 1);
-        println();
-    }
-
-    void PrintableUART::println(bool b)
-    {
-        print(b);
-        println();
-    }
-
-    void PrintableUART::println(double d)
-    {
-        print(d);
-        println();
-    }
-
-    void PrintableUART::println(uint8_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        print(num, base);
-        println();
-    }
-
-    void PrintableUART::println(uint16_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        print(num, base);
-        println();
-    }
-
-    void PrintableUART::println(uint32_t num, IntegerBase base /* = IntegerBase::DEC */)
-    {
-        print(num, base);
-        println();
-    }
-
-    void PrintableUART::println(const char * str)
-    {
-        println(str, strlen(str));
-    }
-
-    void PrintableUART::println(const char * str, size_t length)
-    {
-        print(str, length);
-        println();
-    }
-
-
-
-    void PrintableUART::printBase(uintmax_t num, IntegerBase base, const char * fmt, size_t size)
-    {
-        switch (base)
-        {
-        case IntegerBase::DEC:
-            printDec(num, fmt);
-            break;
-
-        case IntegerBase::BIN:
-            // Digits in base 2 = size in bytes * 8
-            printBin(num, size * 8);
-            break;
-
-        case IntegerBase::HEX:
-            // Digits in base 16 = size in bytes * 2
-            printHex(num, size * 2);
-            break;
-
-        default:
-            print("<invalid_base>");
-        }
-    }
-
-    void PrintableUART::printDec(uintmax_t num, const char * fmt)
-    {
-        char buffer[64];
-        snprintf(buffer, sizeof(buffer), fmt, static_cast<uint32_t>(num));
-        print(buffer);
-    }
-
-    void PrintableUART::printBin(uintmax_t value, size_t digits)
-    {
-        // Need 8 digits for every byte
-        char buffer[sizeof(value) * 8];
-
-        // Check bounds
-        if (digits > sizeof(buffer))
-        {
-            print("<bin_value_too_big>");
-            return;
-        }
-        // Nothing to do
-        if (digits == 0)
-            return;
-
-        for (size_t i = 0; i < digits; ++i)
-        {
-            // Convert bit to '0' or '1'
-            // First digit in buffer is MSB in value, so shift from high to low
-            buffer[i] = '0' + ((value >> (digits - 1 - i)) & 0x1);
-        }
-
-        print(buffer, digits);
-    }
-
-    void PrintableUART::printHex(uintmax_t value, size_t digits)
-    {
-        // Need 2 digits for every byte
-        char buffer[sizeof(value) * 2];
-
-        // Check bounds
-        if (digits > sizeof(buffer))
-        {
-            print("<hex_value_too_big>");
-            return;
-        }
-        // Nothing to do
-        if (digits == 0)
-            return;
-
-        for (size_t i = 0; i < digits; ++i)
-        {
-            // Convert 4 bits to hex
-            // First digit in buffer is 4 MSBs in value, so shift from high to low
-            uint8_t hex = ((value >> ((digits - 1 - i) * 4)) & 0xF);
-            if (hex > 9)
-                buffer[i] = 'A' + (hex - 10);
-            else
-                buffer[i] = '0' + hex;
-        }
-
-        print(buffer, digits);
-    }
 } // namespace sta

src/spi/device.cpp

@@ -1,88 +0,0 @@
-#include <sta/spi/device.hpp>
-
-#include <sta/assert.hpp>
-
-
-namespace sta
-{
-    SPIDevice::SPIDevice(SPI * intf, GpioPin * csPin)
-        : intf_{intf}, csPin_{csPin}
-    {
-        STA_ASSERT(intf != nullptr);
-        STA_ASSERT(csPin != nullptr);
-    }
-
-    void SPIDevice::beginTransmission()
-    {
-        // Acquire SPI access and activate device
-        intf_->acquire();
-        select();
-    }
-
-    void SPIDevice::endTransmission()
-    {
-        // Deactivate device and release SPI access
-        deselect();
-        intf_->release();
-    }
-
-
-    // Forward I/O operations to SPI interface
-
-    void SPIDevice::transfer(uint8_t data)
-    {
-        intf_->transfer(data);
-    }
-
-    void SPIDevice::transfer16(uint16_t data)
-    {
-        intf_->transfer16(data);
-    }
-
-    void SPIDevice::transfer(const uint8_t * buffer, size_t size)
-    {
-        STA_ASSERT(buffer != nullptr);
-
-        intf_->transfer(buffer, size);
-    }
-
-    void SPIDevice::transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size)
-    {
-        STA_ASSERT(txBuffer != nullptr);
-        STA_ASSERT(rxBuffer != nullptr);
-        STA_ASSERT(size != 0);
-
-        intf_->transfer(txBuffer, rxBuffer, size);
-    }
-
-    void SPIDevice::receive(uint8_t * buffer, size_t size)
-    {
-        STA_ASSERT(buffer != nullptr);
-
-        intf_->receive(buffer, size);
-    }
-
-    void SPIDevice::fill(uint8_t value, size_t count)
-    {
-        STA_ASSERT(count != 0);
-
-        intf_->fill(value, count);
-    }
-
-
-    const SPISettings & SPIDevice::settings() const
-    {
-        return intf_->settings();
-    }
-
-
-    void SPIDevice::select()
-    {
-        csPin_->setState(GpioPinState::GPIO_LOW);
-    }
-
-    void SPIDevice::deselect()
-    {
-        csPin_->setState(GpioPinState::GPIO_HIGH);
-    }
-} // namespace sta

src/spi/spi.cpp

@@ -1,27 +0,0 @@
-#include <sta/spi/spi.hpp>
-
-#include <cstdio>
-
-namespace sta
-{
-    SPI::SPI(const SPISettings & settings, Mutex * mutex /* = nullptr */)
-        : settings_{settings}, mutex_{mutex}
-    {}
-
-    const SPISettings & SPI::settings()
-    {
-        return settings_;
-    }
-
-    void SPI::acquire()
-    {
-        if (mutex_ != nullptr)
-            mutex_->acquire();
-    }
-
-    void SPI::release()
-    {
-        if (mutex_ != nullptr)
-            mutex_->release();
-    }
-} // namespace sta

src/uart.cpp

@@ -6,7 +6,6 @@
 #include <cstring>
 
 
-
 namespace sta
 {
     void UART::write(uint8_t value)