本篇實作接續上一篇將圖形顯示在TFT LCD屏幕上，差別在於上一篇是引用別人已經產生的16進位程式碼，本篇要來實作，如何從選取的圖檔，轉換成16進位程式碼，讓 Arduino的程式讀取後，顯示在LCD螢幕。
首先，找一個要轉檔的圖片，找的圖形要線條稍微簡單，程式中轉成單色的圖片會比較好看。我找了一隻魚的Clipart 圖片當作範例：
下載的檔案，圖片的解析度是6805x4431，先用小畫家，將圖片縮小，縮小的比例，依照顯示器的大小來決定。以我的顯示器為例，ST7735解析度160x128，先選擇「調整大小」→「像素」→ 輸入解析度（不要超過顯示器的數值）→ 「確定」，看到畫面縮小後存檔。
到 這裡 下載 LCD Image Converter 轉檔工具。下載後執行程式，並開啟小畫家儲存的檔案。
下拉選單「Options」→ 「Conversion」，開啟另一個視窗，在「Preset:」下拉選擇「Monochrome」，反白「Inverse」欄位打勾。
點選頁簽「Image」→ 在Block size:選擇「16 bit」。
按下「Show Preview」，出現以下視窗：
將右邊一堆16進位的數字「全選Ctrl+A」複製Ctrl+C起來。開啟 Arduino IDE 程式，貼在以下兩行程式中間。
到這裡已經將顯示器常用的繪圖、文字、圖形的功能做一些紀錄與實作，接下來要接上SD卡，SD卡上有圖檔，看看如何將圖檔顯示在屏幕上。
首先，找一個要轉檔的圖片，找的圖形要線條稍微簡單，程式中轉成單色的圖片會比較好看。我找了一隻魚的Clipart 圖片當作範例：
下載的檔案，圖片的解析度是6805x4431，先用小畫家，將圖片縮小，縮小的比例，依照顯示器的大小來決定。以我的顯示器為例，ST7735解析度160x128，先選擇「調整大小」→「像素」→ 輸入解析度（不要超過顯示器的數值）→ 「確定」，看到畫面縮小後存檔。
到 這裡 下載 LCD Image Converter 轉檔工具。下載後執行程式，並開啟小畫家儲存的檔案。
點選頁簽「Image」→ 在Block size:選擇「16 bit」。
按下「Show Preview」，出現以下視窗：
將右邊一堆16進位的數字「全選Ctrl+A」複製Ctrl+C起來。開啟 Arduino IDE 程式，貼在以下兩行程式中間。
static const unsigned char PROGMEM fish[] = {
};
再使用 drawBitmap()函式將上面的16進位資料載入，就會呈現單一的顏色圖形在顯示器上。到這裡已經將顯示器常用的繪圖、文字、圖形的功能做一些紀錄與實作，接下來要接上SD卡，SD卡上有圖檔，看看如何將圖檔顯示在屏幕上。
[程式]
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#define TFT_CS 10
#define TFT_DC 9
#define TFT_RST 8
#define TFT_SCLK 13
#define TFT_MOSI 11
// Color definitions
#define BLACK 0x0000
#define BLUE 0xF800
#define RED 0x001F
#define GREEN 0x07E0
#define CYAN 0xFFE0
#define MAGENTA 0xF81F
#define YELLOW 0x07FF
#define WHITE 0xFFFF
#define PURPLE 0x88FF
#define ORANGE 0x099F
static const unsigned char PROGMEM fish[] = {
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0x0000, 0x0000, 0x0000, 0x001d, 0x0002, 0x0092, 0x0081, 0x0024, 0x0094, 0x0090, 0x0000, 0x0000, 0x0000, 0x0000, 0x0084, 0x00a2, 0x0052, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0003, 0x00ea, 0x0054, 0x005a, 0x004a, 0x0042, 0x00f0, 0x0000, 0x0000, 0x0000, 0x0000, 0x00d5, 0x0029, 0x0029, 0x0018, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0074, 0x008a, 0x0084, 0x0091, 0x002b, 0x0040, 0x0000, 0x0000, 0x0000, 0x0000, 0x0050, 0x00b4, 0x0085, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x000f, 0x0051, 0x0032, 0x004a, 0x00ae, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x004a, 0x004a, 0x0054, 0x0098, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00fc, 0x0089, 0x0025, 0x0070, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0029, 0x0029, 0x0022, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0007, 0x00f6, 0x00df, 0x0040, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0034, 0x008c, 0x0095, 0x0018, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0015, 0x0050, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0012, 0x0055, 0x0048, 0x00a8, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0019, 0x0042, 0x0025, 0x0010, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x000a, 0x002b, 0x0052, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0009, 0x0049, 0x0009, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0006, 0x0024, 0x00d4, 0x0030, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0005, 0x0052, 0x00a2, 0x0090, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0002, 0x0089, 0x0049, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0003, 0x0024, 0x002a, 0x0030, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0001, 0x0052, 0x00b1, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x008a, 0x0054, 0x00a0, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00d1, 0x000a, 0x0030, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x004a, 0x00ad, 0x0060, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0068, 0x0090, 0x00a0, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0025, 0x0025, 0x0020, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0018, 0x0092, 0x0060, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0015, 0x0049, 0x0040, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x000a, 0x0024, 0x00c0, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0005, 0x0052, 0x0080, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0006, 0x0009, 0x0080, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0001, 0x00aa, 0x0080, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0001, 0x0045, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00ab, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00c6, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0038, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0028, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0010, 0x0000, 0x0000, 0x0000
};
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);
void setup()
{
tft.initR(INITR_BLACKTAB); // 初始化設定 ST7735S chip, black tab
tft.setRotation(3); //轉 270度
tft.fillScreen(BLACK);
tft.drawBitmap(1,10,fish,160,104,ORANGE);
}
void loop()
{
}
[執行結果]
[參考資料]
- Adafruit：Adafruit GFX Graphics Library
- Henrys Bench：Arduino Adafruit GFX Library User Guide
- Educ8s.tv：Arduino Bitmap Graphics Tutorial
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