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分享一个OLED上的简易图形库（附源代码）
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作者 | strongerHuang
微信公众号 | 嵌入式专栏
嵌入式专栏
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嵌入式专栏
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底层的通信和驱动，这里就不描述了，讲述主要的API接口：
嵌入式专栏
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1.InitDisplay()初始化显示
void InitDisplay () { Wire.beginTransmission(address); Wire.write(commands); Wire.write(0xA1); Wire.write(0xAF); Wire.endTransmission();}void Single (uint8_t x) { Wire.write(onecommand); Wire.write(x);}void ClearDisplay () { for (int p = 0 ; p < 8; p++) { Wire.beginTransmission(address); Single(0xB0 + p); Wire.endTransmission(); for (int q = 0 ; q < 8; q++) { Wire.beginTransmission(address); Wire.write(data); for (int i = 0 ; i < 20; i++) Wire.write(0); Wire.endTransmission(); } }}void PlotPoint (int x, int y) { Wire.beginTransmission(address); //地址 Single(0x00 + ((x + 2) & 0x0F)); Single(0x10 + ((x + 2)>>4)); Single(0xB0 + (y >> 3)); Single(0xE0); //读取并修改写入 Wire.write(onedata); Wire.endTransmission(); Wire.requestFrom(address, 2); Wire.read(); int j = Wire.read(); Wire.beginTransmission(address); Wire.write(onedata); Wire.write((1<<(y & 0x07)) | j); Single(0xEE); // Cancel read modify write Wire.endTransmission();}void MoveTo (int x, int y) { x0 = x; y0 = y;}void DrawTo (int x, int y) { int sx, sy, e2, err; int dx = abs(x - x0); int dy = abs(y - y0); if (x0 < x) sx = 1; else sx = -1; if (y0 < y) sy = 1; else sy = -1; err = dx - dy; for (;;) { PlotPoint(x0, y0); if (x0==x && y0==y) return; e2 = err<<1; if (e2 > -dy) { err = err - dy; x0 = x0 + sx; } if (e2 < dx) { err = err + dx; y0 = y0 + sy; } }}void PlotChar (int c, int x, int y) { int h = y & 0x07; for (int p = 0; p < 2; p++) { Wire.beginTransmission(address); Single(0xB0 + (y >> 3) + p); // Page for (int col=0; col<6; col++) { Single(0x00 + ((x+2+col) & 0x0F)); // Column low nibble Single(0x10 + ((x+2+col)>>4)); // Column high nibble Single(0xE0); // Read modify write Wire.write(onedata); Wire.endTransmission(); Wire.requestFrom(address, 2); Wire.read(); // Dummy read int j = Wire.read(); Wire.beginTransmission(address); Wire.write(onedata); int bits = ReverseByte(pgm_read_byte(&CharMap[c-32][col])); Wire.write((bits<<h)>>(p<<3) | j); Single(0xEE); // Cancel read modify write } Wire.endTransmission(); }}void PlotText(PGM_P s) { int p = (int)s; while (1) { char c = pgm_read_byte(p++); if (c == 0) return; PlotChar(c, x0, y0); x0 = x0 + 6; }}嵌入式专栏
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const int Now = 1547; // 比如设置时间为：15:47unsigned long StartMins = (unsigned long)((Now/100)*60 + (Now%100));
void loop () { unsigned int SampleNo = StartMins/15; // 绘制温度图 int x1 = 16, y1 = 11; int yscale = 2; MoveTo(26, 56); PlotText(PSTR("Temperature ~C")); //横轴 MoveTo(x1, y1); DrawTo(x1+96, y1); for (int i=0; i<=24; i=i+4) { int mark = x1+i*4; MoveTo(mark, y1); DrawTo(mark, y1-2); int tens = i/10; if (tens != 0) { PlotChar(tens+'0', mark-6, y1-12); PlotChar(i%10+'0', mark, y1-12); } else PlotChar(i%10+'0', mark-3, y1-12); } //纵轴 MoveTo(x1, y1); DrawTo(x1, y1+50); for (int i=5; i<=25; i=i+5) { int mark = y1+i*yscale-10; MoveTo(x1, mark); DrawTo(x1-2, mark); int tens = i/10; if (tens != 0) PlotChar(tens+'0', x1-15, mark-3); PlotChar(i%10+'0', x1-9, mark-3); } for (;;) { //每15分钟更新一下 while ((unsigned long) ((StartMins + millis()/60000)/15)%96 == SampleNo); // Time to take a new reading SampleNo = (SampleNo+1)%96; int Temperature = (analogRead(A2)*25)/233; PlotPoint(SampleNo+x1, Temperature-10+y1); }}后台回复『单片机』『嵌入式软件设计与开发』阅读更多相关文章。
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