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path: root/digit.lua
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local digit = {}

local function write(data)
    i2c.start(0)
    i2c.address(0, 0x70, i2c.TRANSMITTER)
    i2c.write(0, data)
    i2c.stop(0)
end

--   -a-
--  f   b
--   -g-
--  e   c
--   -d- p
local function chr(x)
    local c = {
        [' '] = 0, [':'] = 2, ['-'] = 0x40,
        ['0'] = 0x3f, ['1'] = 0x06, ['2'] = 0x5b, ['3'] = 0x4f, ['4'] = 0x66,
        ['5'] = 0x6d, ['6'] = 0x7d, ['7'] = 0x07, ['8'] = 0x7f, ['9'] = 0x6f,
    }
    return c[x] or c[' ']
end

function digit.init()
    i2c.setup(0, 2, 1, i2c.SLOW)
    write(0x21)
    digit.on(true)
    digit.brightness(1)
    digit.output('00:00')
end

function digit.on(flag)
    write(flag and 0x81 or 0x80)
end

function digit.brightness(val)
    write(0xe0 + val)
end

function digit.blink(flag)
    write(flag and 0x85 or 0x81)
end

function digit.output(txt)
    write{ 0, chr(txt:sub(1, 1)), 0, chr(txt:sub(2, 2)), 0,
        chr(txt:sub(3, 3)), 0, chr(txt:sub(4, 4)), 0, chr(txt:sub(5, 5)) }
end

return digit