Nanopc-t4 (rk3399) Game1 OLED (I2C) display time weather temperature

If you encounter some problems , See this introduction It's amazing NanoPC-T4(RK3399) As the initial configuration of the workstation and related applications

A long time ago, when I was playing single chip microcomputer in the undergraduate stage , The rest of the 0.96 oled One more , I happened to watch Zhi Huijun's little TV recently , brainwave , Just want to use this oled Make one that can display the current time , Weather and cpu Temperature display ; At the same time, it should be noted that , NanoPC-T4(RK3399) The board has been opened I2C The hardware driver of , That is, just connect according to the pin diagram I2C, This board can identify the corresponding device on the bus , Just follow USB One principle ; So the hardware is solved !!!

There is a missing diagram

Tell the truth , Linux Under the development , It's all that simple , In especial python, Everything you can think of , Someone is already GitHub The bag is ready for you clone And used , That's what this thing is today , Go directly to GitHub Search for a wave python oled drive Just find one , Then take a closer look at , luma A package is a call to oled Driven by various models python package , So the software has also solved !!!

1. see GPIO Definition wiringpi library

wiringpi A library is an operating hardware GPIO Driver library , After installation, you can set the high and low levels of external pins , And different communication protocols , such as I2C, SPI etc.

mkdir -p /home/02_hardware && cd /home/02_hardware

#  Remove Older Versions 
wget http://112.124.9.243:8888/wiringpi/friendlyelec-rk3399/remove_oldversion_wiringPi.sh
chmod 755 remove_oldversion_wiringPi.sh
sudo ./remove_oldversion_wiringPi.sh

#  Install a new version 
wget http://112.124.9.243:8888/wiringpi/friendlyelec-rk3399/wiringpi-v2.44-friendlyelec-rk3399.deb
sudo dpkg -i  wiringpi-v2.44-friendlyelec-rk3399.deb
(base) [email protected]:~$ gpio readall
 +------+-----+----------+------+ Model  NanoPC-T4 +------+----------+-----+------+
 | GPIO | wPi |   Name   | Mode | V | Physical | V | Mode |   Name   | wPi | GPIO |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
 |      |     |     3.3V |      |   |  1 || 2  |   |      | 5V       |     |      |
 |      |     | I2C2_SDA |      |   |  3 || 4  |   |      | 5V       |     |      |
 |      |     | I2C2_SCL |      |   |  5 || 6  |   |      | GND(0V)  |     |      |
 |   32 |   7 | GPIO1_A0 |   IN | 0 |  7 || 8  |   |      | I2C3_SCL |     |      |
 |      |     |  GND(0V) |      |   |  9 || 10 |   |      | I2C3_SDA |     |      |
 |   33 |   0 | GPIO1_A1 |   IN | 0 | 11 || 12 | 1 | IN   | GPIO1_C2 | 1   |  50  |
 |   35 |   2 | GPIO1_A3 |   IN | 0 | 13 || 14 |   |      | GND(0V)  |     |      |
 |   36 |   3 | GPIO1_A4 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO1_C6 | 4   |  54  |
 |      |     |     3.3V |      |   | 17 || 18 | 0 | IN   | GPIO1_C7 | 5   |  55  |
 |   40 |  12 | GPIO1_B0 |  ALT |   | 19 || 20 |   |      | GND(0V)  |     |      |
 |   39 |  13 | GPIO1_A7 |  ALT |   | 21 || 22 | 0 | IN   | GPIO1_D0 | 6   |  56  |
 |   41 |  14 | GPIO1_B1 |  ALT |   | 23 || 24 |   | ALT  | GPIO1_B2 | 10  |  42  |
 |      |     |  GND(0V) |      |   | 25 || 26 |   | ALT  | GPIO4_C5 | 11  |  140 |
 |      |     | I2C2_SDA |      |   | 27 || 28 |   |      | I2C2_SCL |     |      |
 |  132 |  21 | GPIO4_A4 |   IN | 0 | 29 || 30 |   |      | GND(0V)  |     |      |
 |  133 |  22 | GPIO4_A5 |   IN | 0 | 31 || 32 |   |      | I2S_CLK  |     |      |
 |  131 |  23 | GPIO4_A3 |   IN | 0 | 33 || 34 |   |      | GND(0V)  |     |      |
 |  134 |  24 | GPIO4_A6 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO4_A7 | 27  |  135 |
 |  124 |  25 | GPIO3_D4 |  ALT |   | 37 || 38 |   | ALT  | GPIO3_D5 | 28  |  125 |
 |      |     |  GND(0V) |      |   | 39 || 40 |   | ALT  | GPIO3_D6 | 29  |  126 |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+

Here we know Pin 3,5 Is the corresponding I2C2_SDA/SCL
So will oled The four pins of vcc/gnd,sda,scl Just plug it in

2. Make sure there is no problem with the hardware (i2c-tools)

There are two points to note before using the following command :

1. i2c The device is executing a command (0x00) And data (0x04) There is a distinction between reading and writing
2. This board is the first I2C Interfaces are used I2C-2 Bus No
3. This board is I2C The hardware chip is rk3x-i2c, Instead of the usual xxx

#  Installation identification i2c Tools for 
sudo apt-get install i2c-tools
(base) [email protected]:~$ apt-cache policy i2c-tools
i2c-tools:
  Installed: 4.0-2
  Candidate: 4.0-2
  Version table:
 *** 4.0-2 500
        500 http://mirrors.ustc.edu.cn/ubuntu-ports bionic/universe arm64 Packages
        100 /var/lib/dpkg/status

#  Print all i2c Bus ,  I found that the chip used here is rk3x-i2c,  Not raspberry pie bcm2835
(base) [email protected]:~$ sudo i2cdetect -l
i2c-0	i2c       	rk3x-i2c                        	I2C adapter
i2c-1	i2c       	rk3x-i2c                        	I2C adapter
i2c-2	i2c       	rk3x-i2c                        	I2C adapter
i2c-4	i2c       	rk3x-i2c                        	I2C adapter
i2c-7	i2c       	rk3x-i2c                        	I2C adapter
i2c-9	i2c       	DP-AUX                          	I2C adapter
i2c-10	i2c       	DP-AUX                          	I2C adapter

#  testing I2C Bus  
(py3.7) [email protected]:zjq$ sudo i2cdetect -F 2
Functionalities implemented by /dev/i2c-2:
I2C                              yes
SMBus Quick Command              yes
SMBus Send Byte                  yes
SMBus Receive Byte               yes
SMBus Write Byte                 yes
SMBus Read Byte                  yes
SMBus Write Word                 yes
SMBus Read Word                  yes
SMBus Process Call               yes
SMBus Block Write                yes
SMBus Block Read                 no
SMBus Block Process Call         no
SMBus PEC                        yes
I2C Block Write                  yes
I2C Block Read                   yes


#  take oled Insert into 1356 Pin ,  Query occupied iic Address ,  Note from the above figure , 1345 The pin corresponds to i2c-2 Bus 
#  So here's the query i2c-2 Bus 
[email protected]:~$ sudo i2cdetect -y -r -a 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
#  Here's just one I2C Address  0xUU

#  Check i2c Is there a driver 
cat /sys/bus/i2c/devices/i2c-1/name


#  Register data export . On the bus i2c The data of the device is to be stored in registers .
(base) [email protected]:~$ sudo i2cdump -y 2 0x3c
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
10: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
20: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
30: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
40: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
50: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
60: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
70: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
80: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
90: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
a0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
b0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
c0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
d0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
e0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC
f0: 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43    CCCCCCCCCCCCCCCC


#  Register data write , That is, insert data into a bit address in the register ：
sudo i2cset -y 2 0x3c 0x20 0x55

#  Read I2C Devices on the bus 0x3c Of 0x80 Register address data 
sudo i2cget -y 2 0x3c 0x20

3. install oled drive python package

git clone  https://github.com.cnpmjs.org/rm-hull/luma.examples
cd luma.examples && pip install -e .

3.1 Use case testing

cd /home/02_hardware/luma.examples/examples
python 3d_box.py --help

I2C:
  --i2c-port I2C_PORT   I2C bus number (default: 1)
  --i2c-address I2C_ADDRESS
                        I2C display address (default: 0x3C)
#  Therefore, you can run... Directly with the following command demo
python 3d_box.py --i2c-port=2 --i2c-address=0x3c

3.2 The test case 2

# https://blog.csdn.net/ki1381/article/details/79291138/
# https://blog.csdn.net/u011198687/article/details/120347965

#!/usr/bin/python3
# -*- coding: utf-8 -*-
from luma.core.interface.serial import i2c
from luma.core.render import canvas
# SSD1306, SSD1309, SSD1322, SSD1325, SSD1327, SSD1331,SSD1351, SSD1362 and SH1106 devices.
from luma.oled.device import ssd1306, ssd1309, ssd1322, ssd1325, ssd1327, ssd1331, ssd1351, ssd1362, sh1106
from time import sleep

from PIL import ImageDraw, ImageFont

""" OLED luma  Driver library test program   function ： Show  hello world  And rectangular frame 10 second  """
__version__ = 1.0
#  Initialize port 
serial = i2c(port=2, address=0x3C)
# #  Initialization equipment , Change here ssd1306, ssd1325, ssd1331, sh1106
device = ssd1306(serial)
#  Call the display function 
with canvas(device) as draw:
    font = ImageFont.load_default()
    #  there font2 The font can be changed to Chinese font ,  For instance from win10 The path of windows/fonts/ In italics ,  Put it here ,  That's all right. 
    font2 = ImageFont.truetype('/usr/share/fonts/truetype/freefont/FreeSans.ttf', 20)
    draw.rectangle(device.bounding_box, outline="white", fill="black")
    draw.text((10, 25), "hello world", font=font2, fill=255)
#  Delay display 10s
while True:
    pass

Be careful : The font used here can go to `c:/windows/fonts/ Regular script, etc .ttf` Upload to the board , Then use it according to the absolute path

4. oled Display time , The weather , temperature

Be careful : oled If the Chinese font is displayed, you need to start from win Copy a Chinese font inside ttf Put the file on the board

It's very simple , Direct use of system time , Through the weather API Check the weather , By reading CPU Get the temperature from the temperature file , The last indication is oled above

#  Set up oled Show 
#  City :  blessing 
#  date   Time   week 
#  The weather today 
#  Tomorrow's weather 
#  Update every ten seconds 
from luma.core.interface.serial import i2c
from luma.core.render import canvas
# SSD1306, SSD1309, SSD1322, SSD1325, SSD1327, SSD1331,SSD1351, SSD1362 and SH1106 devices.
from luma.oled.device import ssd1306, ssd1309, ssd1322, ssd1325, ssd1327, ssd1331, ssd1351, ssd1362, sh1106
from PIL import ImageDraw, ImageFont
import urllib.request
import gzip
import json
import datetime
import time


__version__ = 1.0
#  Initialize port 
serial = i2c(port=2, address=0x3C)
# #  Initialization equipment , Change here ssd1306, ssd1325, ssd1331, sh1106
device = ssd1306(serial)

def get_weather_data() :
    url1 = 'http://wthrcdn.etouch.cn/weather_mini?city='+urllib.parse.quote(" Xi'an ")
    url2 = 'http://wthrcdn.etouch.cn/weather_mini?citykey=101010100'
    weather_data = urllib.request.urlopen(url1).read()
    weather_data = gzip.decompress(weather_data).decode('utf-8')
    weather_dict = json.loads(weather_data) #  take json Convert data to dictionary format 
    forecast = weather_dict.get('data').get('forecast')
    today_weather = " today : " + forecast[0].get('type') + " " + weather_dict.get('data').get('wendu')+'℃ ' + \
        "(" +forecast[0].get('low')[3:-1] + "~" + forecast[0].get('high')[3:-1] +")"
    # print(today_weather)
    tomorrow_weather = " bright : " + forecast[1].get('type') + " " +\
        forecast[1].get('low')[3:] + "~" + forecast[1].get('high')[3:]
    # print(tomorrow_weather)
    
    return today_weather, tomorrow_weather

font1 = ImageFont.load_default() #  default font 
font2 = ImageFont.truetype('/home/pi/zjq/04_hardware/oled/ttf_font/STKAITI.TTF', 16) #  Chinese Fonts 


def display():
    today_weather, tomorrow_weather = get_weather_data()
    now_time = datetime.datetime.now().strftime("%m-%d %A %H:%M ")# now.strftime("%Y-%m-%d %H:%M:%S")
    # print(now_time)
    with open("/sys/devices/virtual/thermal/thermal_zone0/temp", "r") as f:
        temperature = str(int(int(f.read())/1000))
    with canvas(device) as draw:
        draw.rectangle(device.bounding_box, outline="white", fill="black")
        draw.text((0, 0), today_weather, font=font2, fill=255)
        draw.text((0, 16), tomorrow_weather, font=font2, fill=255)
        draw.text((5, 38), "CPU:" + temperature+"°", font=font1, fill=255)
        draw.text((5, 50), now_time, font=font1, fill=255)
    time.sleep(10)
    
while True:
    display()
# display()

5. application 1 oled Scroll through the text

text = " Drink in   Li Bai   You can't see the Yellow River coming up , Running to the sea and never returning .\
 If you don't see the mirror in the high hall, you'll have white hair , Morning as black as snow .  You must be happy in life ,\
 Don't empty the golden cup to the moon . I'm born to be useful , When all the money is gone ."


from time import sleep
from luma.core.virtual import viewport
from PIL import ImageDraw, ImageFont
virtual = viewport(device, width=2048, height=720)
font2 = ImageFont.truetype('/home/pi/zjq/04_hardware/oled/STKAITI.TTF', 16) #  Chinese Fonts 


#  Horizontal scrolling 
def horizontal_scroll():
    with canvas(virtual) as draw:
        draw.text((0,0), text=text, fill="white", font=font2)
    sleep(1)
    y = 0
    for x in range(len(text)*16):
        virtual.set_position((x, y))
        sleep(0.05)
        
def main():
    print(" current version ：", __version__)
    horizontal_scroll()
# vertical_scroll()
 
main()