function returnRGB(valeur)
    local t = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" }
    local r, g, b

    r = (16 * premier chiffre hexa (exemple : si F alors = 16) + (1 * second chiffre hexa (exemple : si 4 alors = 5)
    g = (16 * premier chiffre hexa) + (1 * second chiffre hexa)
    b = (16 * premier chiffre hexa) + (1 * second chiffre hexa)

    return r.." - "..g.." - "..b
end

while true do
    screen:clear()

    screen:print(10, 10, returnRGB("FF0000"), Color.new(255, 255, 255))

    screen.waitVblankStart()
    screen.flip()
end