74 lines
2.0 KiB
Lua
74 lines
2.0 KiB
Lua
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------------------------------------------------------------------------------
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-- u8glib example which shows how to implement the draw loop without causing
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-- timeout issues with the WiFi stack. This is done by drawing one page at
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-- a time, allowing the ESP SDK to do its house keeping between the page
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-- draws.
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--
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-- This example assumes you have an SSD1306 display connected to pins 4 and 5
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-- using I2C and that the profont22r is compiled into the firmware.
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-- Please edit the init_display function to match your setup.
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--
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-- Example:
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-- dofile("u8g_drawloop.lua")
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------------------------------------------------------------------------------
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local disp
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local font
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function init_display()
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local sda = 4
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local sdl = 5
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local sla = 0x3c
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i2c.setup(0,sda,sdl, i2c.SLOW)
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disp = u8g.ssd1306_128x64_i2c(sla)
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font = u8g.font_profont22r
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end
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local function setLargeFont()
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disp:setFont(font)
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disp:setFontRefHeightExtendedText()
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disp:setDefaultForegroundColor()
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disp:setFontPosTop()
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end
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-- Start the draw loop with the draw implementation in the provided function callback
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function updateDisplay(func)
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-- Draws one page and schedules the next page, if there is one
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local function drawPages()
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func()
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if (disp:nextPage() == true) then
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node.task.post(drawPages)
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end
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end
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-- Restart the draw loop and start drawing pages
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disp:firstPage()
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node.task.post(drawPages)
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end
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function drawHello()
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setLargeFont()
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disp:drawStr(30,22, "Hello")
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end
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function drawWorld()
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setLargeFont()
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disp:drawStr(30,22, "World")
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end
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local drawDemo = { drawHello, drawWorld }
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function demoLoop()
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-- Start the draw loop with one of the demo functions
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local f = table.remove(drawDemo,1)
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updateDisplay(f)
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table.insert(drawDemo,f)
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end
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-- Initialise the display
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init_display()
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-- Draw demo page immediately and then schedule an update every 5 seconds.
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-- To test your own drawXYZ function, disable the next two lines and call updateDisplay(drawXYZ) instead.
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demoLoop()
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tmr.alarm(4, 5000, 1, demoLoop)
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