本帖最后由 jinglixixi 于 2019-12-16 22:18 编辑
PIC16F18446开发板是一块外设简单的最小系统板，在熟悉GPIO口的使用方法后，可以采用模拟I2C接口的方式来驱动OLED屏进行显示，其显示效果如图1和图2所示。
图1 6*8点阵字模显示
图2 8*16点阵字模显示
在编写程序前，用MCC可对使用的引脚进行设置，见图3所示。
图3 设置OLED屏引脚
为识读的方便，可对使用的引脚加以重新命名，如PB5为SCL，PB7为SDA。
OLED屏的初始化函数为：
- void OLED_Init(void)
- {
- __delay_ms(50);
- OLED_WrCmd(0xae);//--turn off oled panel
- OLED_WrCmd(0x00);//---set low column address
- OLED_WrCmd(0x10);//---set high column address
- OLED_WrCmd(0x40);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F)
- OLED_WrCmd(0x81);//--set contrast control register
- OLED_WrCmd(Brightness); // Set SEG Output Current Brightness
- OLED_WrCmd(0xa1);//--Set SEG/Column Mapping 0xa0×óÓÒ·´ÖÃ 0xa1Õý³£
- OLED_WrCmd(0xc8);//Set COM/Row Scan Direction 0xc0ÉÏÏ·´Öà 0xc8Õý³£
- OLED_WrCmd(0xa6);//--set normal display
- OLED_WrCmd(0xa8);//--set multiplex ratio(1 to 64)
- OLED_WrCmd(0x3f);//--1/64 duty
- OLED_WrCmd(0xd3);//-set display offset Shift Mapping RAM Counter (0x00~0x3F)
- OLED_WrCmd(0x00);//-not offset
- OLED_WrCmd(0xd5);//--set display clock divide ratio/oscillator frequency
- OLED_WrCmd(0x80);//--set divide ratio, Set Clock as 100 Frames/Sec
- OLED_WrCmd(0xd9);//--set pre-charge period
- OLED_WrCmd(0xf1);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
- OLED_WrCmd(0xda);//--set com pins hardware configuration
- OLED_WrCmd(0x12);
- OLED_WrCmd(0xdb);//--set vcomh
- OLED_WrCmd(0x40);//Set VCOM Deselect Level
- OLED_WrCmd(0x20);//-Set Page Addressing Mode (0x00/0x01/0x02)
- OLED_WrCmd(0x02);//
- OLED_WrCmd(0x8d);//--set Charge Pump enable/disable
- OLED_WrCmd(0x14);//--set(0x10) disable
- OLED_WrCmd(0xa4);// Disable Entire Display On (0xa4/0xa5)
- OLED_WrCmd(0xa6);// Disable Inverse Display On (0xa6/a7)
- OLED_WrCmd(0xaf);//--turn on oled panel
- OLED_Fill(0x00);
- OLED_Set_Pos(0,0);
- }
相应的字符串显示函数为：
- void OLED_P8x16Str(unsigned char x,unsigned char y,unsigned char ch[])
- {
- unsigned char c=0,i=0,j=0;
- while (ch[j]!='\0')
- {
- c =ch[j]-32;
- if(x>120){x=0;y++;}
- OLED_Set_Pos(x,y);
- for(i=0;i<8;i++)
- OLED_WrDat(F8X16[c*16+i]);
- OLED_Set_Pos(x,y+1);
- for(i=0;i<8;i++)
- OLED_WrDat(F8X16[c*16+i+8]);
- x+=8;
- j++;
- }
- }
图示效果的主程序为：
- void main(void)
- {
- SYSTEM_Initialize();
- OLED_Init();
- __delay_ms(20);
- OLED_CLS();
- OLED_P8x16Str(0,0,"PIC16F18446");
- OLED_P8x16Str(0,2,"OLED Display");
- OLED_P8x16Str(0,4,"jinglixixi");
- OLED_P8x16Str(0,6,"2019.12.16");
-
- while (1)
- {
- led0_Toggle(); // LED ON
- __delay_ms(200); // 1 Second Delay
- }
-
- }
图4 程序界面
经编译处理，将生成的HEX文件复制到虚拟U盘即可见到显示效果。
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