/* Get a block of data. */
bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
if (bytes_read < 0) {
sr_err("Failed to read FTDI data (%d): %s.",
bytes_read, ftdi_get_error_string(devc->ftdic));
/* Get a block of data. */
bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
if (bytes_read < 0) {
sr_err("Failed to read FTDI data (%d): %s.",
bytes_read, ftdi_get_error_string(devc->ftdic));