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local oled = {}

local disp

function oled.init()
    i2c.setup(0, 2, 1, i2c.SLOW)
    disp = u8g.ssd1306_128x32_i2c(0x3c)
    disp:setContrast(0)
    oled.cmd{0xd9, 0x21}
end

function oled.update(func)
    local function drawPages()
	func(disp)
	if disp:nextPage() then
	    node.task.post(drawPages)
	end
    end
    disp:firstPage()
    node.task.post(drawPages)
end

function oled.cmd(t)
    i2c.start(0)
    i2c.address(0, 0x3c, i2c.TRANSMITTER)
    i2c.write(0, 0)
    for i, v in ipairs(t) do
        i2c.write(0, v)
    end
    i2c.stop(0)
end

return oled