【Banana PI Leaf S3开发板试用体验】+OLED屏显示驱动

OLED屏有多种形式，在例程中提供了一种I2C接口的0.96寸单色屏程序。本人则有一款I2C接口的0.96寸双色屏，在掌握GPIO口使用的基础上，以模拟I2C的方式实现了它的驱动显示。

其引脚的连接关系如下：

VCC----3.3V

GND---GND

SDA----GPIO15

SCL----GPIO16

图1引脚连接

将所用引脚设置为输出模式的语句为：

sda=Pin(15,Pin.OUT) #15

sck=Pin(16,Pin.OUT) #16

实现数据数据发送的函数为：

defWrite_IIC_Byte(IIC_Byte):da=IIC_Bytesck.off()fori in range(8):m=dam=m&0x80if(m==0x80):sda.on()else:sda.off()da=da<<1sck.on()sck.off()

实现清屏的函数为：

defOLED_Clear():fori in range(8):OLED_WR_Byte(0xb0+i,OLED_CMD)OLED_WR_Byte(0x00,OLED_CMD)OLED_WR_Byte(0x10,OLED_CMD)forj in range(128):OLED_WR_Byte(0x00,OLED_DATA)

OLED屏的初始化函数为：

defOLED_Init():OLED_WR_Byte(0xAE,OLED_CMD)OLED_WR_Byte(0x02,OLED_CMD)OLED_WR_Byte(0x10,OLED_CMD)OLED_WR_Byte(0x40,OLED_CMD)OLED_WR_Byte(0x81,OLED_CMD)OLED_WR_Byte(0xff,OLED_CMD)OLED_WR_Byte(0xA1,OLED_CMD)OLED_WR_Byte(0xC8,OLED_CMD)OLED_WR_Byte(0xA6,OLED_CMD)OLED_WR_Byte(0xA8,OLED_CMD)OLED_WR_Byte(0x3f,OLED_CMD)OLED_WR_Byte(0xD3,OLED_CMD)OLED_WR_Byte(0x00,OLED_CMD)OLED_WR_Byte(0xd5,OLED_CMD)OLED_WR_Byte(0x80,OLED_CMD)OLED_WR_Byte(0xD9,OLED_CMD)OLED_WR_Byte(0xF1,OLED_CMD)OLED_WR_Byte(0xDA,OLED_CMD)OLED_WR_Byte(0x12,OLED_CMD)OLED_WR_Byte(0xDB,OLED_CMD)OLED_WR_Byte(0x40,OLED_CMD)OLED_WR_Byte(0x20,OLED_CMD)OLED_WR_Byte(0x02,OLED_CMD)OLED_WR_Byte(0x8D,OLED_CMD)OLED_WR_Byte(0x14,OLED_CMD)OLED_WR_Byte(0xA4,OLED_CMD)OLED_WR_Byte(0xA6,OLED_CMD)OLED_WR_Byte(0xAF,OLED_CMD)OLED_WR_Byte(0xAF,OLED_CMD)OLED_Clear()OLED_Set_Pos(0,0)

为了验证程序的可行性，特将清屏函数改造为彩条绘制函数，其内容为：

defOLED_Clear():foriinrange(8):OLED_WR_Byte(0xb0+i,OLED_CMD)OLED_WR_Byte(0x00,OLED_CMD)OLED_WR_Byte(0x10,OLED_CMD)forjinrange(128):OLED_WR_Byte(0xf0,OLED_DATA)#OLED_DATAdefOLED_text():OLED_Init()OLED_Clear()OLED_text()

经上传测试，其显示效果如图2所示，说明驱动程序是有效的。

图2绘制彩条

为了实现字符，需按如下形式来定义字库：

F8X16=[0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,

0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

** ... **

0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]

所设计的字符串显示函数为：

defOLED_ShowString(x,y,chr,Char_Size):forcharacterinchr: OLED_ShowChar(x,y,character,Char_Size) x+=8if(x>120): x=0y+=2

实现字符串输出测试的程序如下：

defOLED_text():OLED_Init()OLED_Clear()OLED_ShowString(0,0,'Banana PI ',16)OLED_ShowString(0,2,'Leaf S3',16)OLED_ShowString(0,4,'OLED TEST',16)OLED_ShowString(0,6,'jinglixixi',16)OLED_text()

经上传测试，其显示效果如图3所示，说明驱动程序是有效的。

图3显示字符串

通过OLED屏驱动程序的设计，基本上掌握了Thonny的编程方法、函数的设计及数组元素的使用等，收获还是很多的，后面就可以自主地进行功能设计了。