ESP8266基于microPython的OLED(SSD1306)驱动程序
最近买了一个NodeMCU的板子：NodeMCU是一个开源的物联网平台， 它使用Lua脚本语言编程。该平台基于eLua开源项目,底层使用ESP8266 sdk 0.9.5版本。该平台使用了很多开源项目, 例如 lua-cjson, spiffs. NodeMCU包含了可以运行在 esp8266 Wi-Fi SoC芯片之上的固件,以及基于ESP-12模组的硬件。
作为练手的几个基本项目，先做出了通过I2C控制OLED显示的程序
硬件接线
上图是NodeMcu的IO引脚分配图
使用GND、3V3、D4(GPIO2)、D3(GPIO0)连接I2C接口的OLED
GPIO2接SCL，GPIO0接SDA
Python代码
使用microPython语言，仅实现8x6的字符、数字、字母的显示：
from machine import Pin,I2C
i2c = I2C(-1,scl = Pin(2), sda = Pin(0), freq = 400000)
--i2c_address = 60
i2c_address = i2c.scan()[0]
def init():
init_command = [0xae, 0x00, 0x10, 0x40, 0xb0, 0x81,
0xff, 0xa0, 0xa6, 0xa8, 0x3f, 0xc0,
0xd3, 0x00, 0xd5, 0x80, 0xd8, 0x05,
0xd9, 0xf1, 0xda, 0x12, 0xdb, 0x30,
0x8d, 0x14]
for i in init_command:
i2c.writeto_mem(i2c_address, 0x00, chr(i))
clear()
i2c.writeto_mem(i2c_address, 0x00, chr(0xaf))
def clear():
for i in range(8):
i2c.writeto_mem(i2c_address, 0x00, chr(0xb0+i))
i2c.writeto_mem(i2c_address, 0x00, chr(0x00))
i2c.writeto_mem(i2c_address, 0x00, chr(0x10))
for n in range(128):
i2c.writeto_mem(i2c_address, 0x40, chr(0x00))
def set_pos(x, y):
if x<128 and y<8:
i2c.writeto_mem(i2c_address, 0x00, chr(0xb0+y))
i2c.writeto_mem(i2c_address, 0x00, chr(((x&0xf0)>>4)|0x10))
i2c.writeto_mem(i2c_address, 0x00, chr(x&0x0f))
def char(x, y, ch):
Font6x8 = [[0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
[0x00, 0x00, 0x00, 0x2f, 0x00, 0x00],
[0x00, 0x00, 0x07, 0x00, 0x07, 0x00],
[0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14],
[0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12],
[0x00, 0x62, 0x64, 0x08, 0x13, 0x23],
[0x00, 0x36, 0x49, 0x55, 0x22, 0x50],
[0x00, 0x00, 0x05, 0x03, 0x00, 0x00],
[0x00, 0x00, 0x1c, 0x22, 0x41, 0x00],
[0x00, 0x00, 0x41, 0x22, 0x1c, 0x00],
[0x00, 0x14, 0x08, 0x3E, 0x08, 0x14],
[0x00, 0x08, 0x08, 0x3E, 0x08, 0x08],
[0x00, 0x00, 0x00, 0xA0, 0x60, 0x00],
[0x00, 0x08, 0x08, 0x08, 0x08, 0x08],
[0x00, 0x00, 0x60, 0x60, 0x00, 0x00],
[0x00, 0x20, 0x10, 0x08, 0x04, 0x02],
[0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E],
[0x00, 0x00, 0x42, 0x7F, 0x40, 0x00],
[0x00, 0x42, 0x61, 0x51, 0x49, 0x46],
[0x00, 0x21, 0x41, 0x45, 0x4B, 0x31],
[0x00, 0x18, 0x14, 0x12, 0x7F, 0x10],
[0x00, 0x27, 0x45, 0x45, 0x45, 0x39],
[0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30],
[0x00, 0x01, 0x71, 0x09, 0x05, 0x03],
[0x00, 0x36, 0x49, 0x49, 0x49, 0x36],
[0x00, 0x06, 0x49, 0x49, 0x29, 0x1E],
[0x00, 0x00, 0x36, 0x36, 0x00, 0x00],
[0x00, 0x00, 0x56, 0x36, 0x00, 0x00],
[0x00, 0x08, 0x14, 0x22, 0x41, 0x00],
[0x00, 0x14, 0x14, 0x14, 0x14, 0x14],
[0x00, 0x00, 0x41, 0x22, 0x14, 0x08],
[0x00, 0x02, 0x01, 0x51, 0x09, 0x06],
[0x00, 0x32, 0x49, 0x59, 0x51, 0x3E],
[0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C],
[0x00, 0x7F, 0x49, 0x49, 0x49, 0x36],
[0x00, 0x3E, 0x41, 0x41, 0x41, 0x22],
[0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C],
[0x00, 0x7F, 0x49, 0x49, 0x49, 0x41],
[0x00, 0x7F, 0x09, 0x09, 0x09, 0x01],
[0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A],
[0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F],
[0x00, 0x00, 0x41, 0x7F, 0x41, 0x00],
[0x00, 0x20, 0x40, 0x41, 0x3F, 0x01],
[0x00, 0x7F, 0x08, 0x14, 0x22, 0x41],
[0x00, 0x7F, 0x40, 0x40, 0x40, 0x40],
[0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F],
[0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F],
[0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E],
[0x00, 0x7F, 0x09, 0x09, 0x09, 0x06],
[0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E],
[0x00, 0x7F, 0x09, 0x19, 0x29, 0x46],
[0x00, 0x46, 0x49, 0x49, 0x49, 0x31],
[0x00, 0x01, 0x01, 0x7F, 0x01, 0x01],
[0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F],
[0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F],
[0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F],
[0x00, 0x63, 0x14, 0x08, 0x14, 0x63],
[0x00, 0x07, 0x08, 0x70, 0x08, 0x07],
[0x00, 0x61, 0x51, 0x49, 0x45, 0x43],
[0x00, 0x00, 0x7F, 0x41, 0x41, 0x00],
[0x00, 0x55, 0x2A, 0x55, 0x2A, 0x55],
[0x00, 0x00, 0x41, 0x41, 0x7F, 0x00],
[0x00, 0x04, 0x02, 0x01, 0x02, 0x04],
[0x00, 0x40, 0x40, 0x40, 0x40, 0x40],
[0x00, 0x00, 0x01, 0x02, 0x04, 0x00],
[0x00, 0x20, 0x54, 0x54, 0x54, 0x78],
[0x00, 0x7F, 0x48, 0x44, 0x44, 0x38],
[0x00, 0x38, 0x44, 0x44, 0x44, 0x20],
[0x00, 0x38, 0x44, 0x44, 0x48, 0x7F],
[0x00, 0x38, 0x54, 0x54, 0x54, 0x18],
[0x00, 0x08, 0x7E, 0x09, 0x01, 0x02],
[0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C],
[0x00, 0x7F, 0x08, 0x04, 0x04, 0x78],
[0x00, 0x00, 0x44, 0x7D, 0x40, 0x00],
[0x00, 0x40, 0x80, 0x84, 0x7D, 0x00],
[0x00, 0x7F, 0x10, 0x28, 0x44, 0x00],
[0x00, 0x00, 0x41, 0x7F, 0x40, 0x00],
[0x00, 0x7C, 0x04, 0x18, 0x04, 0x78],
[0x00, 0x7C, 0x08, 0x04, 0x04, 0x78],
[0x00, 0x38, 0x44, 0x44, 0x44, 0x38],
[0x00, 0xFC, 0x24, 0x24, 0x24, 0x18],
[0x00, 0x18, 0x24, 0x24, 0x18, 0xFC],
[0x00, 0x7C, 0x08, 0x04, 0x04, 0x08],
[0x00, 0x48, 0x54, 0x54, 0x54, 0x20],
[0x00, 0x04, 0x3F, 0x44, 0x40, 0x20],
[0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C],
[0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C],
[0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C],
[0x00, 0x44, 0x28, 0x10, 0x28, 0x44],
[0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C],
[0x00, 0x44, 0x64, 0x54, 0x4C, 0x44],
[0x00, 0x00, 0x10, 0xFE, 0x82, 0x00],
[0x00, 0x00, 0x00, 0xFF, 0x00, 0x00],
[0x00, 0x82, 0xFE, 0x10, 0x00, 0x00],
[0x02, 0x01, 0x01, 0x02, 0x02, 0x01]]
i = 0
c = ord(ch)-32
if c < 99:
set_pos(x,y)
for i in range(6):
i2c.writeto_mem(i2c_address, 0x40, chr(Font6x8[c][i]))
def string(x, y, buf):
for i in buf:
if i == '\0':
break
char(x, y, i)
x = x + 6;
if x>122:
x = 0
y = y + 1时间：2017年7月25日
作者：许基业