LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
(unsigned char *)&devc->channel_levels,
sizeof(devc->channel_levels), 200);
if (ret != sizeof(devc->channel_levels)) {
LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
(unsigned char *)&devc->channel_levels,
sizeof(devc->channel_levels), 200);
if (ret != sizeof(devc->channel_levels)) {