ESP8266学习之驱动IIC(I2C) oled屏 128*64
ESP8266学习之驱动IIC(I2C) oled屏 128*64
屏幕主控：SSD1306
接口：I2C
使用模块：ESP-12f
使用语言：Lua
首先你的固件要有I2C的支持，才能进行开发。可以进入官网进行选择下载：
https://nodemcu-build.com/
官网给出了I2C的相关函数
其实很简单，一共就六个函数，而且很傻瓜的操作。
首先是id参数，可以理解为操作那个设备，如果有多个i2c设备就要多设置几个，我们只有一共oled，所以就
id = 0
i2c.setup(id, pinSDA, pinSCL, speed)函数
这个函数实现I2C的引脚和速度的初始化设置speed参数有以下几个值
i2c.SLOW (100kHz),
i2c.FAST (400kHz),
i2c.FASTPLUS (1MHz) 如果要使用1MHz的，必须使用语句：
node.setcpufreq(node.CPU160MHZ)
id = 0
SCL = 1
SDA = 2
i2c.address(id, device_addr, direction)函数
--id: 就是上文所述的功能
--device_addr:设备的地址，比如我的oled地址默认是0x78
--direction：设置你下一次的数据传输操作是传字节还是接收字节，不用也行，可以用i2c.write()代替
id = 0
ADDR = 0x78
i2c.address(id, ADDR, i2c.TRANSMITTER) --表示下一个数据操作是传字节
i2c.read(id, len)
顾名思义，接收一个字节--id: 就是上文所述的功能
--len：就是你要接收多少个字节，SSD1306 oled不需要读字节
id = 0
ADDR = 0x78
len = 1
i2c.address(id, ADDR, i2c.RECEIVER) --表示下一个数据操作是接收字节
i2c.read(id, len)
i2c.start(id) 和 i2c.stop(id)函数
这两个函数大家应该不陌生，i2c必须启动才能传输数据，传完后必须停止i2c.start(id)
i2c.write( id, byte )
i2c.stop(id)
i2c.write(id, data1[, data2[, ..., datan]])函数
可以一次传多个数据，一般只传一个字节的数据i2c.start(id)
i2c.write( id, 0xff )
i2c.stop(id)
说了这么多，大家可以尝试自己编写程序，接下来是我编写的lua脚本，把线接对就可以直接使用
init.lua文件：
id = 0
sda = 1
scl = 2
ADDR = 0x78
node.setcpufreq(node.CPU160MHZ)
i2c.setup( id, sda, scl, i2c.FASTPLUS )
function init() --初始化函数
node.setcpufreq(node.CPU160MHZ)
i2c.setup( id, SDA, SCL, i2c.FASTPLUS )
dofile( "image.lua" ) --打开存放图片数据的文件
write_cmd( id, 0xae ); --关显示
write_cmd( id, 0x20 );
write_cmd( id, 0x00 ); --设置内存地址模式
--00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode
write_cmd( id, 0xc8 );
write_cmd( id, 0xa1 ); --设置扫描行和列方式
write_cmd( id, 0x81 );
write_cmd( id, 0x00 ); --对比度
write_cmd( id, 0xa8 );
write_cmd( id, 0x3f );
write_cmd( id, 0xa5 ); ----set normal display
write_cmd( id, 0xa4 ); --0xa4,Output follows RAM content;0xa5,Output ignores RAM content
write_cmd( id, 0xd3 );
write_cmd( id, 0x00 ); --设置显示偏移
write_cmd( id, 0xd5 );
write_cmd( id, 0xf0 );
write_cmd( id, 0xd9 );
write_cmd( id, 0x22 );
write_cmd( id, 0xda );
write_cmd( id, 0x12 );
write_cmd( id, 0x8d );
write_cmd( id, 0x14 ); --打开电荷泵
write_cmd( id, 0xaf );
CLS()
print( "Build acomplish!\n" )
end
function write_cmd( id, CMD ) --写指令函数
i2c.start(id)
i2c.write( id, ADDR )
i2c.write( id, 0x00 )
c = i2c.write( id, CMD )
i2c.stop(id)
print( "CMD:"..CMD.." was Write "..c )
end
function write_dat( id, DATA ) --写数据函数
i2c.start(id)
i2c.write( id, ADDR )
i2c.write( id, 0x40 )
c = i2c.write( id, DATA )
i2c.stop(id)
--print( "DATA:"..DATA.." was Write "..c )
end
function DIS12864( DATA ) --显示128*64的图片
write_cmd( id, 0x21 )
write_cmd( id, 0x00 )
write_cmd( id, 0x7f )
write_cmd( id, 0x22 )
write_cmd( id, 0x00 )
write_cmd( id, 0x07 )
pos = 1
for i = 0, 7, 1 do
for k = 0, 127, 1 do
write_dat( id, DATA[pos] )
pos = pos + 1
end
end
end
function CLS() --清屏函数
write_cmd( id, 0x21 )
write_cmd( id, 0x00 )
write_cmd( id, 0x7f )
write_cmd( id, 0x22 )
write_cmd( id, 0x00 )
write_cmd( id, 0x07 )
for i = 0, 7, 1 do
for k = 0, 127, 1 do
write_dat( id, 0x00 )
end
end
end
-----------------------------------
init()
DIS12864( img )
image.lua文件：
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}