Imports periph.io/x/periph/conn/spi periph.io/x/periph/devices periph.io/x/periph periph.io/x/periph/conn/spi/spireg periph.io/x/periph/host periph.io/x/periph/devices/apa102 Standard library imports image/png image image/jpeg image/gif time errors flag fmt io/ioutil log os path/filepath strconv strings