AVR微控制器中的窗台或C ++ 11上的水培法

水位传感器

背光灯

水泵

实时时钟

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整体设计

C ++ 11在哪里？

字符串资源的放置

PromptUser("Are you sure you want to format SD-card?");

char prompt[] PROGMEM = "Are you sure you want to format SD-card?";
PromptUser(prompt);

extern char prompt[] PROGMEM;

char prompt[] PROGMEM = "Are you sure you want to format SD-card?";

#define DEF_STR(__name, __text) \
    const char __name[sizeof(__text)] = __text;

class Strings {
public:
    DEF_STR(Prompt, "Are you sure you want to format SD-card?")
    DEF_STR(OtherString, "...")
    …
} __attribute__((packed));

extern const Strings strings PROGMEM;

const Strings strings PROGMEM;

PromptUser(strings.prompt);

/** Bitmap descriptor. */
struct Bitmap {
    /** Pointer to data array if in data memory. Offset of data array relatively
     * to Bitmaps class instance start address if in program memory.
     */
    const u8 *data;
    /** Number of pages in the bitmap. */
    u8 numPages,
    /** Number of columns in the bitmap. */
       numColumns;
} __PACKED;

template<u8... data>
constexpr static u8
Bitmap_NumDataBytes()
{
    return sizeof...(data);
}

/** Define bitmap.
 * @param __name Name for accessing.
 * @param __numPages Number of pages in the bitmap. Number of columns defined as
 *      total number of data bytes divided by number of pages.
 * @param __VA_ARGS__ Data bytes.
 */
#define DEF_BITMAP(__name, __numPages, ...) \
    const u8 __CONCAT(__name, __data__) \
        [Bitmap_NumDataBytes<__VA_ARGS__>()] = { __VA_ARGS__ }; \
    const Bitmap __name { \
        reinterpret_cast<const u8 *>(OFFSETOF(Bitmaps, __CONCAT(__name, __data__))), \
        __numPages, \
        sizeof(__CONCAT(__name, __data__)) / __numPages};

/** Global bitmaps repository. Stored in program memory. */
class Bitmaps {
public:

    /** Thermometer icon. */
    DEF_BITMAP(Thermometer, 1,
        0b01101010,
        0b10011110,
        0b10000001,
        0b10011110,
        0b01101010
    )

    /** Sun icon. */
    DEF_BITMAP(Sun, 1,
        0b00100100,
        0b00011000,
        0b10100101,
        0b01000010,
        0b01000010,
        0b10100101,
        0b00011000,
        0b00100100
    )
    ...
};
extern const Bitmaps bitmaps PROGMEM;

二进制文字

可变参数模板

SendCommand(Command::DISPLAY_ON);
SendCommand(Command::SET_COM_PINS, COM_PINS | COM_PINS_ALTERNATIVE);
SendCommand(Command::SET_COLUMN_ADDRESS, curVp.minCol, curVp.maxCol);

    /** Queue command sending.
     * @param bytes Up to MAX_CMD_SIZE bytes of command data.
     */
    template <typename... TByte>
    void
    SendCommand(TByte... bytes)
    {
        cmdSize = sizeof...(bytes);
        controlSent = false;
        cmdInProgress = true;
        SetCmdByte(sizeof...(bytes) - 1, bytes...);
        i2cBus.RequestTransfer(DISPLAY_ADDRESS, true,
                               CommandTransferHandler);
    }

    template <typename... TByte>
    inline void
    SetCmdByte(int idx, u8 byte, TByte... bytes)
    {
        cmdBuf[idx] = byte;
        SetCmdByte(idx - 1, bytes...);
    }

    inline void
    SetCmdByte(int, u8 byte)
    {
        cmdBuf[0] = byte;
    }

    Variant<MainPage,
            Menu,
            LinearValueSelector,
            TimeSelector> curPage;
    ...
    /** Get type code for the specified page class. */
    template <class TPage>
    static constexpr u8
    GetPageTypeCode()
    {
        return decltype(curPage)::GetTypeCode<TPage>();
    }
...
curPage.Engage(nextPageTypeCode, page);