Add full-range autofocus option

start_tx.sh

@@ -118,11 +118,12 @@ sleep 10
 # Set a fixed lens offset for the PiCam v3, in dioptres. May help with autofocus in cold temperatures.
 # The PiCam v3 can be offset by a maximum of -3 dioptres before hitting a hard-stop
 # Set this to -99.0 to set the PiCam v3 to use the entire lens travel range.
+# The modified focus mapping will be printed out on startup.
 # e.g. to offset by 1 dioptre:
 # --afoffset -1.0 \
 #
 # Use the Focus Figure-of-merit metadata to select the transmitted image, instead of selecting on file size
-# Only works for lenses with autofocus (PiCam v3)
+# Only useful for lenses with autofocus (PiCam v3)
 # --use_focus_fom
 
 python3 tx_picamera2_gps.py \

tx/WenetPiCamera2.py

@@ -152,11 +152,21 @@ class WenetPiCamera2(object):
         if self.af_offset != 0:
             tuning = Picamera2.load_tuning_file("imx708.json")
             map = Picamera2.find_tuning_algo(tuning, "rpi.af")["map"]
-            #print(map)
-            offset_hw = self.af_offset * (map[3]-map[1])/(map[2]-map[0])
-            for i in range(1, len(map), 2):
-                map[i] += offset_hw
-            #print(Picamera2.find_tuning_algo(tuning, "rpi.af")["map"])
+            self.debug_message(f"Default Focus Mapping: {map}")
+
+            if self.af_offset == -99:
+                # Custom map for testing the full extents of the lens range.
+                map[0] = 0.0
+                map[1] = 0.0
+                map[2] = 15.0
+                map[3] = 1024.0
+            else:
+                # Otherwise, apply an offset
+                offset_hw = self.af_offset * (map[3]-map[1])/(map[2]-map[0])
+                for i in range(1, len(map), 2):
+                    map[i] += offset_hw
+            
+            self.debug_message(f"Modified Focus Mapping: {Picamera2.find_tuning_algo(tuning, 'rpi.af')['map']}")
 
             self.cam = Picamera2(0, tuning=tuning)