SPIFlash KEYWORD1 initialize KEYWORD2 command KEYWORD2 readStatus KEYWORD2 readByte KEYWORD2 readBytes KEYWORD2 writeByte KEYWORD2 writeBytes KEYWORD2 flashBusy KEYWORD2 chipErase KEYWORD2 blockErase4K KEYWORD2 blockErase32K KEYWORD2 readDeviceId KEYWORD2 readUniqueId KEYWORD2 UNIQUEID KEYWORD2 sleep KEYWORD2 wakeup KEYWORD2 end KEYWORD2