简介

 

合宙esp32C3，128*64 I2C oled，硬件i2c,将下面两个py文件放入esp32.

ssd1306.py是我优化后的，为了避免错误，使用我提供的ssd1306驱动

只支持128*64的I2C oled

代码

main.py

import network
import urequests
import ujson
import time
from machine import RTC,Pin,I2C,Timer
from ssd1306 import SSD1306_I2C

#实例化oled屏
i2c=I2C(0,scl=Pin(5),sda=Pin(4))
oled=SSD1306_I2C(i2c)
#联网设置
url='http://worldtimeapi.org/api/timezone/Asia/Shanghai'
rtc=RTC()
wifi=network.WLAN(network.STA_IF)
wifi.active(True)
#连接wifi，有一定几率连接失败
while not wifi.isconnected():
    wifi.connect('szsb','55555555')
    oled.fill(0)
    oled.text('connecting...',0,0)
    oled.show()
#更新显示连接wifi信息   
oled.fill(0)
oled.text('connect to szsb',0,0)
oled.show()
#获取网络时钟
response=urequests.get(url)
if response.status_code==200:
    parsed=ujson.loads(response.text)#用json处理获取的文本
    datetime_str=str(parsed['datetime'])
    year=int(datetime_str[0:4])
    month=int(datetime_str[5:7])
    day=int(datetime_str[8:10])
    hour=int(datetime_str[11:13])
    minute=int(datetime_str[14:16])
    second=int(datetime_str[17:19])
    msecond=int(datetime_str[20:26])
    #将（年，月，日，星期，小时，分钟，秒，毫秒）赋值给内部实时时钟RTC
    rtc.datetime((year,month,day,parsed['day_of_week'],hour,minute,second,msecond))

#定时器回调函数，从已经初始化的RTC读取时间信息并显示到oled屏
def gain_time():
        date_str='{:4}/{:02}/{:02}'.format(rtc.datetime()[0],rtc.datetime()[1],rtc.datetime()[2])
        time_str='{:02}:{:02}:{:02}'.format(rtc.datetime()[4],rtc.datetime()[5],rtc.datetime()[6])
        oled.fill(0)
        oled.text('SCAU Clock',20,0)
        oled.text('Date:'+date_str,0,25)
        oled.text('Time:'+time_str,0,35)
        oled.text('week:'+str(rtc.datetime()[3]+1),0,45)
        oled.show()

#死循环，1秒调用1次回调函数
while True:
    tim=Timer(0)
    tim.init(period=1000, mode=Timer.PERIODIC, callback=gain_time())
    
    

ssd1306.py

import framebuf
# 寄存器定义
SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_DISP            = const(0xae)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)


class SSD1306:
    def __init__(self,external_vcc):
        self.width = 128
        self.height = 64
        self.external_vcc = external_vcc
        self.pages = 8
        self.init_display()

    def init_display(self):
        for cmd in (
            SET_DISP | 0x00, #熄屏
            SET_MEM_ADDR, 0x00, #水平寻址
            SET_DISP_START_LINE | 0x00,#显示起始行地址
            SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
            SET_MUX_RATIO, 63,
            SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
            SET_DISP_OFFSET, 0x00,
            SET_COM_PIN_CFG, 0x12,
            # timing and driving scheme
            SET_DISP_CLK_DIV, 0x80,
            SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
            SET_VCOM_DESEL, 0x30, # 0.83*Vcc
            # display
            SET_CONTRAST, 0xff, # maximum
            SET_ENTIRE_ON, # output follows RAM contents
            SET_NORM_INV, # not inverted
            # charge pump
            SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
            0x2e, # 禁止滚动
            0xae | 0x01): #开屏
            self.write_cmd(cmd)
        self.fill(0)
        self.show()
        
    def v_scroll(self, d=1): 
        self.write_cmd(0x2e) # 关闭滚动
        if d:
            self.write_cmd(0x26) # 向左
            self.write_cmd(0x00)
            self.write_cmd(0x07) # 起始页
            self.write_cmd(0x00) # 滚动帧率
            self.write_cmd(0x00) # 结束页
        else:
            self.write_cmd(0x27) # 向左
            self.write_cmd(0x00)
            self.write_cmd(0x00) # 起始页
            self.write_cmd(0x00) # 滚动帧率
            self.write_cmd(0x07) # 结束页
            
        self.write_cmd(0x00)
        self.write_cmd(0xff)
        self.write_cmd(0x2f) # 开启滚动
    
    def poweroff(self):
        self.write_cmd(const(0xae) | 0x00)#熄屏

    def contrast(self, contrast):
        self.write_cmd(SET_CONTRAST)
        self.write_cmd(contrast)

    def invert(self, invert):
        self.write_cmd(SET_NORM_INV | (invert & 1))

    def show(self):
        self.write_cmd(SET_COL_ADDR)
        self.write_cmd(0)
        self.write_cmd(127)
        self.write_cmd(SET_PAGE_ADDR)
        self.write_cmd(0)
        self.write_cmd(63)
        self.write_framebuf()

    def fill(self, c):
        self.framebuf.fill(c)

    def pixel(self, x, y, c):
        self.framebuf.pixel(x, y, c)

    def text(self, string, x, y, c=1):
        self.framebuf.text(string, x, y, c)
        
    def hline(self,x,y,w,c=1):
        self.framebuf.hline(x,y,w,c)
    
    def vline(self,x,y,h,c=1):
        self.framebuf.vline(x,y,h,c)
        
    def line(self,x1,y1,x2,y2,c=1):
        self.framebuf.line(x1,y1,x2,y2,c)
        
    def rect(self,x,y,w,h,c=1,f=False):
        self.framebuf.rect(x,y,w,h,c,f)
        
    def ellipse(self,x,y,xr,yr,c,f=False,m=15):
        self.framebuf.ellipse(x,y,xr,yr,c,f,m)
        
    def cube(self,x,y,l):
        self.rect(x,y,l,l)
        self.rect(x+int(0.5*l),int(y-0.5*l),l,l)
        self.line(x,y,int(x+0.5*l),int(y-0.5*l),1)
        self.line(x+l,y,int(x+1.5*l),int(y-0.5*l),1)
        self.line(x,y+l,int(x+0.5*l),int(y+0.5*l),1)
        self.line(x+l,y+l,int(x+1.5*l),int(y+0.5*l),1)
    
    def p8(self,page,x,y):
        for e in range(8):
            byte=bin(page[e]).replace('0b','')
            while len(byte)<8:
                byte='0'+byte
            for i in range(8):
                if byte[i]=='1':
                    self.pixel(x+e,y+i,int(byte[i]))
    
    def p16(self,page,x,y):
        for e in range(32):
            byte=bin(page[e]).replace('0b','')
            while len(byte)<8:
                byte='0'+byte
            for i in range(8):
                if byte[i] and e<16:
                    self.pixel(x+e,y+i,int(byte[i]))
                elif byte[i] and e>=16:
                    self.pixel(x-16+e,y+8+i,int(byte[i]))

    def p32(self,page,x,y):
        for e in range(128):
            byte=bin(page[e]).replace('0b','')
            while len(byte)<8:
                byte='0'+byte
            for i in range(8):
                if byte[i] and e<32:
                    self.pixel(x+e,y+i,int(byte[i]))
                elif byte[i] and 32<=e<64:
                    self.pixel(x+e-32,y+8+i,int(byte[i]))
                elif byte[i] and 64<=e<96:
                    self.pixel(x+e-64,y+16+i,int(byte[i]))
                elif byte[i] and 96<=e<128:
                    self.pixel(x+e-96,y+24+i,int(byte[i]))

class SSD1306_I2C(SSD1306):
    def __init__(self,i2c, addr=0x3c, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        # buffer需要8 * 128的显示字节加1字节命令
        self.buffer = bytearray(8 * 128 + 1)
        self.buffer[0] = 0x40  # Co=0, D/C=1
        self.framebuf = framebuf.FrameBuffer1(memoryview(self.buffer)[1:], 128, 64)
        super().__init__(external_vcc)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80 # Co=1, D/C#=0
        self.temp[1] = cmd
        self.i2c.writeto(self.addr, self.temp)

    def write_framebuf(self):
        self.i2c.writeto(self.addr, self.buffer)

效果