buffer[0] = CP2110_FIFO_PURGE;
buffer[1] = CP2110_FIFO_PURGE_TX | CP2110_FIFO_PURGE_RX;
rc = ser_hid_hidapi_set_data(serial, 0, buffer, sizeof(buffer), 0);
buffer[0] = CP2110_FIFO_PURGE;
buffer[1] = CP2110_FIFO_PURGE_TX | CP2110_FIFO_PURGE_RX;
rc = ser_hid_hidapi_set_data(serial, 0, buffer, sizeof(buffer), 0);