智能家居入門DIY——【7、添加一個LCD12864吧】

        今天加了一個LCD12864，IC看說明上是ST7567，結果一頓U8g2，發現兩個問題：

一、買的時候不知道是賣家寫的我理解錯了仍是怎麼了，反正是不出漢字的。

二、U8g2太大了…………佔了uno的80%還多

        而後，破罐子破摔吧，換成U8glib小了不少；漢字麼，用圖形表示好了，看了一下U8glib的範例，發現能夠用二進制來表示黑白點，而後弄一小工具，讀16×16點陣，轉化爲二進制就能夠了：

const uint8_t wen[] PROGMEM = {
    0x00,0x00,0x23,0xF8,0x12,0x08,0x12,0x08,0x83,0xF8,0x42,0x08,0x42,0x08,0x13,0xF8,
    0x10,0x00,0x27,0xFC,0xE4,0xA4,0x24,0xA4,0x24,0xA4,0x24,0xA4,0x2F,0xFE,0x00,0x00,
};

這是溫字，加PROGMEN關鍵字就不佔運行內存了，因此這樣的字能夠放一些，固然會使得程序佔用的空間大一點，但好處是有針對性，通常咱們也用不了幾個字不是。

三、用那個聲明？

        U8glib這個庫在用的時候須要把它註釋掉的若干行u8g定義中的一行註釋掉，而名字也很直觀，可是無奈的是我確實沒找到我這個的聲明，因此只好找一個類似的咯，幾番實驗和觀察代碼下來，發現主要是位置不一樣，因此選了一個庫就這樣用起來就能夠了：

U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8);    // SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9, RST = 8

四、「英漢混合顯示」

         其實說白了，不管什麼東西顯示的時候都是設置點的顏色而已。因此處理的時候都會和上面所說的圖形同樣。至於咱們寫代碼麼，只要算好偏移，分別用兩種方法顯示：漢字用圖形，其餘英文字母數字字符什麼的仍是用原來的方法，原來的方法即直觀又高效：

void draw(void) {
    // graphic commands to redraw the complete screen should be placed here  
    u8g.drawBitmapP(0, 0, 2, 16, wen);
    u8g.drawBitmapP(16, 0, 2, 16, du);
    u8g.setFont(u8g_font_unifont);
    u8g.drawStr(32, 14, ": 33.70");
    u8g.drawBitmapP(96, 0, 2, 16, sheshidu);

    u8g.drawBitmapP(0, 16, 2, 16, shi);
    u8g.drawBitmapP(16, 16, 2, 16, du);
    u8g.setFont(u8g_font_unifont);
    u8g.drawStr(32, 30, ": 33.70 %RH");
    
}

五、所有代碼：

#include <U8glib.h>

U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8);    // SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9, RST = 8

const uint8_t wen[] PROGMEM = {
    0x00,0x00,0x23,0xF8,0x12,0x08,0x12,0x08,0x83,0xF8,0x42,0x08,0x42,0x08,0x13,0xF8,
    0x10,0x00,0x27,0xFC,0xE4,0xA4,0x24,0xA4,0x24,0xA4,0x24,0xA4,0x2F,0xFE,0x00,0x00,
};
const uint8_t du[] PROGMEM = {
    0x01,0x00,0x00,0x80,0x3F,0xFE,0x22,0x20,0x22,0x20,0x3F,0xFC,0x22,0x20,0x22,0x20,
    0x23,0xE0,0x20,0x00,0x2F,0xF0,0x24,0x10,0x42,0x20,0x41,0xC0,0x86,0x30,0x38,0x0E,
};
const uint8_t sheshidu[] PROGMEM{
    0x60,0x00,0x91,0xF4,0x96,0x0C,0x6C,0x04,0x08,0x04,0x18,0x00,0x18,0x00,0x18,0x00,
    0x18,0x00,0x18,0x00,0x18,0x00,0x08,0x00,0x0C,0x04,0x06,0x08,0x01,0xF0,0x00,0x00,
};
const uint8_t shi[] PROGMEM{
    0x00,0x00,0x27,0xF8,0x14,0x08,0x14,0x08,0x87,0xF8,0x44,0x08,0x44,0x08,0x17,0xF8,
    0x11,0x20,0x21,0x20,0xE9,0x24,0x25,0x28,0x23,0x30,0x21,0x20,0x2F,0xFE,0x00,0x00,
};

void draw(void) {
    // graphic commands to redraw the complete screen should be placed here  
    u8g.drawBitmapP(0, 0, 2, 16, wen);
    u8g.drawBitmapP(16, 0, 2, 16, du);
    u8g.setFont(u8g_font_unifont);
    u8g.drawStr(32, 14, ": 33.70");
    u8g.drawBitmapP(96, 0, 2, 16, sheshidu);

    u8g.drawBitmapP(0, 16, 2, 16, shi);
    u8g.drawBitmapP(16, 16, 2, 16, du);
    u8g.setFont(u8g_font_unifont);
    u8g.drawStr(32, 30, ": 33.70 %RH");
    
}

void setup(void) {
}

void loop(void) {
    // picture loop
    u8g.firstPage();
    do {
        draw();
    } while (u8g.nextPage());

    // rebuild the picture after some delay
    delay(1000);
}