[errors] Doubleread the readback, to clear initial state.

README.TXT

@@ -278,7 +278,10 @@
 
    [xx] is 0x01 on the CP780/CP800/CP900, 0x00 on all others.
 
-   [rr] is 0x00 normally, and 0x08 when ribbon is depleted.
+   [rr] is error code:
+   	0x00 no error
+	0x01 paper out
+	0x08 when ribbon is depleted
 
    [ss] is either 0x00 or 0x70.  Unsure as to its significance; perhaps it
 	means paper or ribbon is already set to go?

selphy_print.c

@@ -410,13 +410,21 @@ int main (int argc, char **argv)
 		}
 	}
 
-top:
 	/* Read in the printer status */
 	ret = libusb_bulk_transfer(dev, endp_up,
 				   rdbuf,
 				   READBACK_LEN,
 				   &num,
 				   2000);
+top:
+
+	/* Do it twice to clear initial state */
+	ret = libusb_bulk_transfer(dev, endp_up,
+				   rdbuf,
+				   READBACK_LEN,
+				   &num,
+				   2000);
+
 	if (ret < 0) {
 		ERROR("libusb error %d: (%d/%d from 0x%02x)\n", ret, num, READBACK_LEN, endp_up);
 		ret = 4;

selphy_print_linux.c

@@ -154,6 +154,7 @@ int main(int argc, char **argv)
 	if (paper_code_offset != -1)
 		paper_code = printers[printer_type].paper_codes[buffer[printers[printer_type].pgcode_offset]];
 
+	read(dev_fd, rdbuf, READBACK_LEN);  /* Read the status from printer */
 top:
 
 	read(dev_fd, rdbuf, READBACK_LEN);  /* Read the status from printer */