NodeMCU OLED using u8g

nodemcu_oled_1.lua

function init_spi_display()
     -- Hardware SPI CLK  = GPIO14
     -- Hardware SPI MOSI = GPIO13
     -- Hardware SPI MISO = GPIO12 (not used)
     -- CS, D/C, and RES can be assigned freely to available GPIOs
     local cs  = 8 -- GPIO15, pull-down 10k to GND
     local dc  = 4 -- GPIO2
     local res = 0 -- GPIO16
     spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
     disp = u8g.ssd1306_128x64_spi(cs, dc, res)
end
function prepare()
     disp:setFont(u8g.font_6x10)
     disp:setFontRefHeightExtendedText()
     disp:setDefaultForegroundColor()
     disp:setFontPosTop()
end

function stringtest(a)
     disp:drawStr(30+a, 31, " 0")
     disp:drawStr90(30, 31+a, " 90")
     disp:drawStr180(30-a, 31, " 180")
     disp:drawStr270(30, 31-a, " 270")
end
function line(a)
     disp:drawStr(0, 0, "drawLine")
     disp:drawLine(7+a, 10, 40, 55)
     disp:drawLine(7+a*2, 10, 60, 55)
     disp:drawLine(7+a*3, 10, 80, 55)
     disp:drawLine(7+a*4, 10, 100, 55)
end
function triangle(a)
     local offset = a
     disp:drawStr(0, 0, "drawTriangle")
     disp:drawTriangle(14,7, 45,30, 10,40)
     disp:drawTriangle(14+offset,7-offset, 45+offset,30-offset, 57+offset,10-offset)
     disp:drawTriangle(57+offset*2,10, 45+offset*2,30, 86+offset*2,53)
     disp:drawTriangle(10+offset,40+offset, 45+offset,30+offset, 86+offset,53+offset)
end

function ascii_1()
     local x, y, s
     disp:drawStr(0, 0, "ASCII page 1")
     for y = 0, 5, 1 do
          for x = 0, 15, 1 do
               s = y*16 + x + 32
               disp:drawStr(x*7, y*10+10, string.char(s))
          end
     end
end

function extra_page(a)
     disp:drawStr(0, 12, "setScale2x2")
     disp:setScale2x2()
     disp:drawStr(0, 6+a, "setScale2x2")
     disp:undoScale()
end

function draw(draw_state)
     local component = bit.rshift(draw_state, 3)

     prepare()

     if (component == 0) then
         stringtest(bit.band(draw_state, 7))
     elseif (component == 1) then
          line(bit.band(draw_state, 7))
     elseif (component == 2) then
          triangle(bit.band(draw_state, 7))
     elseif (component == 3) then
          ascii_1()
     elseif (component == 4) then
            extra_page(bit.band(draw_state, 7))
     end
end

function graphics_test(delay)
     print("--- Starting Graphics Test ---")
     local draw_state
     for draw_state = 0, 4 + 8*8, 1 do
          disp:firstPage()
          repeat
               draw(draw_state)
          until disp:nextPage() == false
          --print(node.heap())
          tmr.delay(delay)
          -- re-trigger Watchdog!
          tmr.wdclr()
     end
     print("--- Graphics Test done ---")
end

--init_i2c_display()
init_spi_display()
graphics_test(50000)

nodemcu_oled_2.lua

myStr0 = "Hello"
myStr1 = "Hello"
myStr2 = "Hello" -- place holders for the other lines
myStr3 = "Hello" -- place holders for the other lines
myStr4 = "Hello"
myStr5 = "Hello"
myStr6 = "Hello"
myStr7 = "Hello"

-- setup SPI and connect display
function init_spi_display()
     -- Hardware SPI CLK  = GPIO14   5
     -- Hardware SPI MOSI = GPIO13   7
     -- Hardware SPI MISO = GPIO12 (not used)
     -- CS, D/C, and RES can be assigned freely to available GPIOs
     local cs  = 8 -- GPIO15, pull-down 10k to GND
     local dc  = 4 -- GPIO2
     local res = 0 -- GPIO16
     spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
     disp = u8g.ssd1306_128x64_spi(cs, dc, res)
end

-- graphic test components
function prepare()
     disp:setFont(u8g.font_6x10)
     disp:setFontRefHeightExtendedText()
     disp:setDefaultForegroundColor()
     disp:setFontPosTop()
end


function draw(void) 
    prepare()
    disp:drawStr(0,0,myStr0)
    disp:drawStr(0,8,myStr1)
    disp:drawStr(0,16,myStr2)
    disp:drawStr(0,24,myStr3)
    disp:drawStr(0,32,myStr4)
    disp:drawStr(0,40,myStr5)
    disp:drawStr(0,48,myStr6)
    disp:drawStr(0,56,myStr7)
end


function loop(void) 
-- this is the loop that u8g apparently needs for display
  disp:firstPage() 
  repeat
    draw()
  until disp:nextPage() == false
 end

 

 
-- below is to set up the timer to keep hitting the display
init_spi_display()

tmr.alarm(3,1000,1,function()   
   disp:firstPage() 
   repeat
      draw()
   until disp:nextPage() == false 
end)

nodemcu_oled_3.lua

function init_spi_display()
     local cs  = 8 -- GPIO15, pull-down 10k to GND
     local dc  = 4 -- GPIO2
     local res = 0 -- GPIO16
     spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
     disp = u8g.ssd1306_128x64_spi(cs, dc, res)
end


function draw()
   disp:setFont(u8g.font_6x10)
   disp:drawStr( 30, 10, "Hello IoT!")
   disp:drawStr( 20, 50, "esp8266...")
   disp:drawLine(0, 25, 128, 25);
   disp:setFont(u8g.font_chikita)
   disp:drawStr( 20, 40, "Hello welcome users") 
   
end
  
function display()
  disp:firstPage()
  repeat
       draw()
  until disp:nextPage() == false      
  display();
end

init_spi_display()

display()

nodemcu_oled_4.lua

--http://www.seeedstudio.com/recipe/index.php?controller=recipe&action=show&recipe_id=219&ref=product
wifi.setmode(wifi.STATION) --Set mode to STATION so he chip can receive the SSID broadcast
function init_OLED(sda,scl) --Set up the u8glib lib
     sla = 0x3c
     i2c.setup(0, sda, scl, i2c.SLOW)
     disp = u8g.ssd1306_128x64_i2c(sla)
     disp:setFont(u8g.font_6x10)
     disp:setFontRefHeightExtendedText()
     disp:setDefaultForegroundColor()
     disp:setFontPosTop()
end
init_OLED(5,6) --Run setting up
tmr.alarm(0,3000,1,function() --A timer, which used to run the following program 
    wifi.sta.getap(function(t) 
         disp:firstPage()
         repeat
            lines = 0
            for k,v in pairs(t) do
                disp:drawStr(0,lines * 11,k.." "..v:sub(3,5).."dbi") --Print the data out
                lines = lines + 1
            end
        until disp:nextPage() == false
    end)
end)

Need float version of firmware, latest.

GND
VCC - 3.3V
SCLK - GPIO14 - D5 Hardware SPI Clock (D0 alt pin nomenclature)
RST - GPIO16 - D0 Reset
CS - GPIO15 - D8 Chip Select
A0/DC - GPIO2 - D4 Data/Command
SDI/MOSI - GPIO13 -D7 Hardware SPI MOSI (D1 alt pin nomenclature)

https://github.com/nodemcu/nodemcu-firmware/tree/master/lua_examples/u8glib

www.htlinux.com

Need a float build with:

• bit
• file
• gpio
• net
• node
• spi
• tmr
• u8g
• uart
• wifi.
  Then you need to select the following driver:
  st7565_64128n_hw_spi