Enhance

adafruit_ov2640.py

@@ -1334,3 +1334,22 @@ def _set_window(
         # Reestablish test pattern
         if self._test_pattern:
             self.test_pattern = self._test_pattern
+
+    @property
+    def exposure(self):
+        """The exposure level of the sensor"""
+        aec_9_2 = self._get_reg_bits(_BANK_SENSOR, _AEC, 0, 0xFF)
+        aec_15_10 = self._get_reg_bits(_BANK_SENSOR, _REG45, 0, 0b111111)
+        aec_1_0 = self._get_reg_bits(_BANK_SENSOR, _REG04, 0, 0b11)
+
+        return aec_1_0 | (aec_9_2 << 2) | (aec_15_10 << 10)
+
+    @exposure.setter
+    def exposure(self, exposure):
+        aec_1_0 = exposure & 0x11
+        aec_9_2 = (exposure >> 2) & 0b11111111
+        aec_15_10 = exposure >> 10
+
+        self._set_reg_bits(_BANK_SENSOR, _AEC, 0, 0xFF, aec_9_2)
+        self._set_reg_bits(_BANK_SENSOR, _REG45, 0, 0b111111, aec_15_10)
+        self._set_reg_bits(_BANK_SENSOR, _REG04, 0, 0b11, aec_1_0)

docs/examples.rst

@@ -4,41 +4,93 @@ Simple test
 Ensure your device works with this simple test.
 
 .. literalinclude:: ../examples/ov2640_simpletest.py
-    :caption: examples/ov2640_simpletest.py
+    :caption: ov2640_simpletest.py
     :linenos:
 
+
+LCD tests
+---------
+
+Kaluga 1.3 with ili9341
+~~~~~~~~~~~~~~~~~~~~~~~
+
 Display an image from the camera on the Kaluga 1.3 board, if it is fitted with an ili9341 display.
 
 .. literalinclude:: ../examples/ov2640_displayio_kaluga1_3_ili9341.py
-    :caption: ../examples/ov2640_displayio_kaluga1_3_ili9341.py
+    :caption: ov2640_displayio_kaluga1_3_ili9341.py
     :linenos:
 
+Kaluga 1.3 with st7789
+~~~~~~~~~~~~~~~~~~~~~~
+
 Display an image from the camera on the Kaluga 1.3 board, if it is fitted with an st7789 display.
 
 .. literalinclude:: ../examples/ov2640_displayio_kaluga1_3_st7789.py
-    :caption: ../examples/ov2640_displayio_kaluga1_3_st7789.py
+    :caption: ov2640_displayio_kaluga1_3_st7789.py
     :linenos:
 
+Raspberry Pi Pico with st7789
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 Display an image from the camera connected to a Raspberry Pi Pico with an st7789 2" display
 
 .. literalinclude:: ../examples/ov2640_displayio_pico_st7789_2in.py
-    :caption: ../examples/ov2640_displayio_pico_st7789_2in.py
+    :caption: ov2640_displayio_pico_st7789_2in.py
     :linenos:
 
-Save an image to internal flash on Kaluga 1.3
+Kaluga 1.3 with ili9341, direct display
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Preview images on LCD, bypassing displayio for slightly higher framerate
+
+.. literalinclude:: ../examples/ov2640_directio_kaluga1_3_ili9341.py
+    :caption: ../examples/ov2640_directio_kaluga1_3_ili9341.py
+    :linenos:
+
+
+Image-saving tests
+------------------
+
+Kaluga 1.3 with ili9341, internal flash, JPEG
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Preview images on LCD t hen save JPEG images to internal flash on Kaluga 1.3.  Requires the second snippet of
+code to be saved as ``boot.py``.
 
 .. literalinclude:: ../examples/ov2640_jpeg_kaluga1_3.py
-    :caption: ../examples/ov2640_jpeg_kaluga1_3.py
+    :caption: ov2640_jpeg_kaluga1_3.py
     :linenos:
 
 ``boot.py`` for the above program
 
 .. literalinclude:: ../examples/ov2640_jpeg_kaluga1_3_boot.py
-    :caption: ../examples/ov2640_jpeg_kaluga1_3_boot.py
+    :caption: ov2640_jpeg_kaluga1_3_boot.py
     :linenos:
 
-Preview images on LCD then save to SD on Kaluga 1.3 fitted with an ili9341 display
+Kaluga 1.3 with ili9341, external SD card, JPEG
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Preview images on LCD then save JPEG images to SD on Kaluga 1.3 fitted with an ili9341 display.
 
 .. literalinclude:: ../examples/ov2640_jpeg_sd_kaluga1_3.py
-    :caption: ../examples/ov2640_jpeg_sd_kaluga1_3.py
+    :caption: ov2640_jpeg_sd_kaluga1_3.py
+    :linenos:
+
+Kaluga 1.3 with ili9341, external SD card, BMP
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Preview images on LCD then save BMP images to SD on Kaluga 1.3 fitted with an ili9341 display.
+
+.. literalinclude:: ../examples/ov2640_bmp_sd_kaluga1_3.py
+    :caption: ov2640_bmp_sd_kaluga1_3.py
+    :linenos:
+
+
+Kaluga 1.3 with Adafruit IO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Upload JPEG images to Adafruit IO.  Requires that WIFI and Adafruit IO be configured in ``secrets.py``.
+
+.. literalinclude:: ../examples/ov2640_aio_kaluga1_3.py
+    :caption: ov2640_aio_kaluga1_3.py
     :linenos:

examples/ov2640_aio_kaluga1_3.py

@@ -0,0 +1,83 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+"""
+The Kaluga development kit comes in two versions (v1.2 and v1.3); this demo is
+tested on v1.3.
+
+The audio board must be mounted between the Kaluga and the LCD, it provides the
+I2C pull-ups(!)
+
+This example requires that your WIFI and Adafruit IO credentials be configured
+in CIRCUITPY/secrets.py, and that you have created a feed called "image" with
+history disabled.
+
+The maximum image size is 100kB after base64 encoding, or about 65kB before
+base64 encoding.  In practice, "SVGA" (800x600) images are typically around
+40kB even though the "capture_buffer_size" (theoretical maximum size) is
+(width*height/5) bytes or 96kB.
+"""
+
+import binascii
+import ssl
+import time
+from secrets import secrets  # pylint: disable=no-name-in-module
+
+import board
+import busio
+import wifi
+import socketpool
+import adafruit_minimqtt.adafruit_minimqtt as MQTT
+from adafruit_io.adafruit_io import IO_MQTT
+import adafruit_ov2640
+
+feed_name = "image"
+
+print("Connecting to WIFI")
+wifi.radio.connect(secrets["ssid"], secrets["password"])
+pool = socketpool.SocketPool(wifi.radio)
+
+print("Connecting to Adafruit IO")
+mqtt_client = MQTT.MQTT(
+    broker="io.adafruit.com",
+    username=secrets["aio_username"],
+    password=secrets["aio_key"],
+    socket_pool=pool,
+    ssl_context=ssl.create_default_context(),
+)
+mqtt_client.connect()
+io = IO_MQTT(mqtt_client)
+
+bus = busio.I2C(scl=board.CAMERA_SIOC, sda=board.CAMERA_SIOD)
+cam = adafruit_ov2640.OV2640(
+    bus,
+    data_pins=board.CAMERA_DATA,
+    clock=board.CAMERA_PCLK,
+    vsync=board.CAMERA_VSYNC,
+    href=board.CAMERA_HREF,
+    mclk=board.CAMERA_XCLK,
+    mclk_frequency=20_000_000,
+    size=adafruit_ov2640.OV2640_SIZE_QVGA,
+)
+
+cam.flip_x = False
+cam.flip_y = False
+cam.test_pattern = False
+
+cam.size = adafruit_ov2640.OV2640_SIZE_SVGA
+cam.colorspace = adafruit_ov2640.OV2640_COLOR_JPEG
+jpeg_buffer = bytearray(cam.capture_buffer_size)
+while True:
+    jpeg = cam.capture(jpeg_buffer)
+    print(f"Captured {len(jpeg)} bytes of jpeg data")
+
+    # b2a_base64() appends a trailing newline, which IO does not like
+    encoded_data = binascii.b2a_base64(jpeg).strip()
+    print(f"Expanded to {len(encoded_data)} for IO upload")
+
+    io.publish("image", encoded_data)
+
+    print("Waiting 3s")
+    time.sleep(3)