Merge pull request #35 from jerryneedell/jerryn_buffer

revise calculation of JPEG buffer

.readthedocs.yaml

@@ -8,6 +8,9 @@
 # Required
 version: 2
 
+sphinx:
+  configuration: docs/conf.py
+
 build:
   os: ubuntu-20.04
   tools:

LICENSES/GPL-2.0-only.txt

@@ -0,0 +1,117 @@
+GNU GENERAL PUBLIC LICENSE
+Version 2, June 1991
+
+Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
+
+Preamble
+
+The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Lesser General Public License instead.) You can apply it to your programs, too.
+
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+
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+signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice

README.rst

@@ -39,7 +39,7 @@ following command to install:
 
 .. code-block:: shell
 
-    circup install ov5640
+    circup install adafruit_ov5640
 
 Or the following command to update an existing version:
 

adafruit_ov5640/__init__.py

@@ -25,7 +25,7 @@ Implementation Notes
 """
 
 # pylint: disable=too-many-lines
-
+# pylint: disable=too-many-public-methods
 # imports
 import time
 import imagecapture
@@ -414,6 +414,28 @@ _pll_pclk_root_div_factors = [1,2,4,8]
 _REG_DLY = const(0xFFFF)
 _REGLIST_TAIL = const(0x0000)
 
+_OV5640_STAT_FIRMWAREBAD = const(0x7F)
+_OV5640_STAT_STARTUP = const(0x7E)
+_OV5640_STAT_IDLE = const(0x70)
+_OV5640_STAT_FOCUSING = const(0x00)
+_OV5640_STAT_FOCUSED = const(0x10)
+
+_OV5640_CMD_TRIGGER_AUTOFOCUS = const(0x03)
+_OV5640_CMD_AUTO_AUTOFOCUS = const(0x04)
+_OV5640_CMD_RELEASE_FOCUS = const(0x08)
+_OV5640_CMD_AF_SET_VCM_STEP = const(0x1A)
+_OV5640_CMD_AF_GET_VCM_STEP = const(0x1B)
+
+_OV5640_CMD_MAIN = const(0x3022)
+_OV5640_CMD_ACK = const(0x3023)
+_OV5640_CMD_PARA0 = const(0x3024)
+_OV5640_CMD_PARA1 = const(0x3025)
+_OV5640_CMD_PARA2 = const(0x3026)
+_OV5640_CMD_PARA3 = const(0x3027)
+_OV5640_CMD_PARA4 = const(0x3028)
+_OV5640_CMD_FW_STATUS = const(0x3029)
+
+
 _sensor_default_regs = [
     _SYSTEM_CTROL0, 0x82,  # software reset
     _REG_DLY, 10,  # delay 10ms
@@ -936,6 +958,27 @@ class _RegBits16:
 
 
 class _SCCB16CameraBase:  # pylint: disable=too-few-public-methods
+    _finalize_firmware_load = (
+        0x3022,
+        0x00,
+        0x3023,
+        0x00,
+        0x3024,
+        0x00,
+        0x3025,
+        0x00,
+        0x3026,
+        0x00,
+        0x3027,
+        0x00,
+        0x3028,
+        0x00,
+        0x3029,
+        0x7F,
+        0x3000,
+        0x00,
+    )
+
     def __init__(self, i2c_bus: I2C, i2c_address: int) -> None:
         self._i2c_device = I2CDevice(i2c_bus, i2c_address)
         self._bank = None
@@ -1004,6 +1047,7 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
         mclk_frequency: int = 20_000_000,
         i2c_address: int = 0x3C,
         size: int = OV5640_SIZE_QQVGA,
+        init_autofocus: bool = True,
     ):  # pylint: disable=too-many-arguments
         """
         Args:
@@ -1028,6 +1072,7 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
                 with sufficiently low jitter.
             i2c_address (int): The I2C address of the camera.
             size (int): The captured image size
+            init_autofocus (bool): initialize autofocus
         """
 
         # Initialize the master clock
@@ -1078,8 +1123,100 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
         self._white_balance = 0
         self.size = size
 
+        if init_autofocus:
+            self.autofocus_init()
+
     chip_id = _RegBits16(_CHIP_ID_HIGH, 0, 0xFFFF)
 
+    def autofocus_init_from_file(self, filename):
+        """Initialize the autofocus engine from a .bin file"""
+        with open(filename, mode="rb") as file:
+            firmware = file.read()
+        self.autofocus_init_from_bitstream(firmware)
+
+    def autofocus_init_from_bitstream(self, firmware: bytes):
+        """Initialize the autofocus engine from a bytestring"""
+        self._write_register(0x3000, 0x20)  # reset autofocus coprocessor
+        time.sleep(0.01)
+
+        arr = bytearray(256)
+        with self._i2c_device as i2c:
+            for offset in range(0, len(firmware), 254):
+                num_firmware_bytes = min(254, len(firmware) - offset)
+                reg = offset + 0x8000
+                arr[0] = reg >> 8
+                arr[1] = reg & 0xFF
+                arr[2 : 2 + num_firmware_bytes] = firmware[
+                    offset : offset + num_firmware_bytes
+                ]
+                i2c.write(arr, end=2 + num_firmware_bytes)
+
+        self._write_list(self._finalize_firmware_load)
+        for _ in range(100):
+            if self.autofocus_status == _OV5640_STAT_IDLE:
+                break
+            time.sleep(0.01)
+        else:
+            raise RuntimeError("Timed out after trying to load autofocus firmware")
+
+    def autofocus_init(self):
+        """Initialize the autofocus engine from ov5640_autofocus.bin"""
+        if "/" in __file__:
+            binfile = (
+                __file__.rsplit("/", 1)[0].rsplit(".", 1)[0] + "/ov5640_autofocus.bin"
+            )
+        else:
+            binfile = "ov5640_autofocus.bin"
+        print(binfile)
+        return self.autofocus_init_from_file(binfile)
+
+    @property
+    def autofocus_status(self):
+        """Read the camera autofocus status register"""
+        return self._read_register(_OV5640_CMD_FW_STATUS)
+
+    def _send_autofocus_command(self, command, msg):  # pylint: disable=unused-argument
+        self._write_register(_OV5640_CMD_ACK, 0x01)  # clear command ack
+        self._write_register(_OV5640_CMD_MAIN, command)  # send command
+        for _ in range(1000):
+            if self._read_register(_OV5640_CMD_ACK) == 0x0:  # command is finished
+                return True
+            time.sleep(0.01)
+        return False
+
+    def autofocus(self) -> list[int]:
+        """Perform an autofocus operation.
+
+        If all elements of the list are 0, the autofocus operation failed. Otherwise,
+        if at least one element is nonzero, the operation succeeded.
+
+        In principle the elements correspond to 5 autofocus regions, if configured."""
+        if not self._send_autofocus_command(_OV5640_CMD_RELEASE_FOCUS, "release focus"):
+            return [False] * 5
+        if not self._send_autofocus_command(_OV5640_CMD_TRIGGER_AUTOFOCUS, "autofocus"):
+            return [False] * 5
+        zone_focus = [self._read_register(_OV5640_CMD_PARA0 + i) for i in range(5)]
+        print(f"zones focused: {zone_focus}")
+        return zone_focus
+
+    @property
+    def autofocus_vcm_step(self):
+        """Get the voice coil motor step location"""
+        if not self._send_autofocus_command(
+            _OV5640_CMD_AF_GET_VCM_STEP, "get vcm step"
+        ):
+            return None
+        return self._read_register(_OV5640_CMD_PARA4)
+
+    @autofocus_vcm_step.setter
+    def autofocus_vcm_step(self, step):
+        """Get the voice coil motor step location, from 0 to 255"""
+        if not 0 <= step <= 255:
+            raise RuntimeError("VCM step must be 0 to 255")
+        self._write_register(_OV5640_CMD_PARA3, 0x00)
+        self._write_register(_OV5640_CMD_PARA4, step)
+        self._send_autofocus_command(_OV5640_CMD_AF_SET_VCM_STEP, "set vcm step")
+
     def capture(self, buf: Union[bytearray, memoryview]) -> None:
         """Capture an image into the buffer.
 
@@ -1099,7 +1236,9 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
     def capture_buffer_size(self) -> int:
         """Return the size of capture buffer to use with current resolution & colorspace settings"""
         if self.colorspace == OV5640_COLOR_JPEG:
-            return self.width * self.height // self.quality
+            #  This is somewhat arbirary but seems to work for a wide range of JPEG images
+            #  the user can chose to further scale the buffer in the user code  if necessary
+            return 2 * (self.width * self.height // self.quality)
         if self.colorspace == OV5640_COLOR_GRAYSCALE:
             return self.width * self.height
         return self.width * self.height * 2
@@ -1406,15 +1545,16 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
 
     @property
     def exposure_value(self) -> int:
-        """Sensor exposure (EV) adjustment, from -4 to 4 inclusive"""
+        """Sensor exposure (EV) adjustment, from -3 to 3 inclusive"""
         return self._ev
 
     @exposure_value.setter
     def exposure_value(self, value: int) -> None:
         if not -3 <= value <= 3:
             raise ValueError(
-                "Invalid exposure value (EV) {value}, use a value from -4..4 inclusive"
+                "Invalid exposure value (EV) {value}, use a value from -3..3 inclusive"
             )
+        self._ev = value
         for offset, reg_value in enumerate(_sensor_ev_levels[value]):
             self._write_register(0x5381 + offset, reg_value)
 
@@ -1430,6 +1570,7 @@ class OV5640(_SCCB16CameraBase):  # pylint: disable=too-many-instance-attributes
                 "Invalid exposure value (EV) {value}, "
                 "use one of the OV5640_WHITE_BALANCE_* constants"
             )
+        self._white_balance = value
         self._write_register(0x3212, 0x3)  # start group 3
         for reg_addr, reg_value in zip(_light_registers, _light_modes[value]):
             self._write_register(reg_addr, reg_value)

adafruit_ov5640/ov5640_autofocus.bin.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 Unknown
+
+SPDX-License-Identifier: GPL-2.0-only

docs/conf.py

@@ -124,7 +124,6 @@ napoleon_numpy_docstring = False
 import sphinx_rtd_theme
 
 html_theme = "sphinx_rtd_theme"
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,

examples/ov5640_jpeg_capture_af.py

@@ -0,0 +1,105 @@
+# SPDX-FileCopyrightText: Copyright (c) 2023 Limor Fried for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+"""
+This demo is designed for the Raspberry Pi Pico and Camera PiCowbell
+When the shutter is pressed the camera is autofocussed before capturing
+an image andsaving it to the microSD card.
+"""
+
+import os
+import time
+import busio
+import board
+import digitalio
+import keypad
+import sdcardio
+import storage
+import adafruit_ov5640
+
+print("Initializing SD card")
+sd_spi = busio.SPI(clock=board.GP18, MOSI=board.GP19, MISO=board.GP16)
+sd_cs = board.GP17
+sdcard = sdcardio.SDCard(sd_spi, sd_cs)
+vfs = storage.VfsFat(sdcard)
+storage.mount(vfs, "/sd")
+
+print("construct bus")
+i2c = busio.I2C(board.GP5, board.GP4)
+print("construct camera")
+reset = digitalio.DigitalInOut(board.GP14)
+cam = adafruit_ov5640.OV5640(
+    i2c,
+    data_pins=(
+        board.GP6,
+        board.GP7,
+        board.GP8,
+        board.GP9,
+        board.GP10,
+        board.GP11,
+        board.GP12,
+        board.GP13,
+    ),
+    clock=board.GP3,
+    vsync=board.GP0,
+    href=board.GP2,
+    mclk=None,
+    shutdown=None,
+    reset=reset,
+    size=adafruit_ov5640.OV5640_SIZE_VGA,
+)
+print("print chip id")
+print(cam.chip_id)
+
+keys = keypad.Keys((board.GP22,), value_when_pressed=False, pull=True)
+
+
+def exists(filename):
+    try:
+        os.stat(filename)
+        return True
+    except OSError as _:
+        return False
+
+
+_image_counter = 0
+
+
+def open_next_image():
+    global _image_counter  # pylint: disable=global-statement
+    while True:
+        filename = f"/sd/img{_image_counter:04d}.jpg"
+        _image_counter += 1
+        if exists(filename):
+            continue
+        print("# writing to", filename)
+        return open(filename, "wb")
+
+
+cam.colorspace = adafruit_ov5640.OV5640_COLOR_JPEG
+cam.quality = 3
+b = bytearray(cam.capture_buffer_size)
+
+cam.autofocus()
+print("AF Status: ", cam.autofocus_status, cam.autofocus_vcm_step)
+
+jpeg = cam.capture(b)
+
+while True:
+    shutter = keys.events.get()
+    # event will be None if nothing has happened.
+    if shutter:
+        if shutter.pressed:
+            cam.autofocus()
+            print("AF Status: ", cam.autofocus_status, cam.autofocus_vcm_step)
+            time.sleep(0.01)
+            jpeg = cam.capture(b)
+            print(f"Captured {len(jpeg)} bytes of jpeg data")
+            print(f" (had allocated {cam.capture_buffer_size} bytes")
+            print(f"Resolution {cam.width}x{cam.height}")
+            try:
+                with open_next_image() as f:
+                    f.write(jpeg)
+                print("# Wrote image")
+            except OSError as e:
+                print(e)

examples/ov5640_jpeg_capture_manual_focus.py

@@ -0,0 +1,115 @@
+# SPDX-FileCopyrightText: Copyright (c) 2023 Limor Fried for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+"""
+This demo is designed for the Raspberry Pi Pico and Camera PiCowbell
+When the shutter is pressed, a prompt is given to enter a step
+for the focus. Enter a value 0-255 to set the focus or
+enter a value >255 to execute an autofocus.
+After the value is input, an image is captured and saved
+to the microSD card.
+"""
+
+import os
+import time
+import busio
+import board
+import digitalio
+import keypad
+import sdcardio
+import storage
+import adafruit_ov5640
+
+print("Initializing SD card")
+sd_spi = busio.SPI(clock=board.GP18, MOSI=board.GP19, MISO=board.GP16)
+sd_cs = board.GP17
+sdcard = sdcardio.SDCard(sd_spi, sd_cs)
+vfs = storage.VfsFat(sdcard)
+storage.mount(vfs, "/sd")
+
+print("construct bus")
+i2c = busio.I2C(board.GP5, board.GP4)
+print("construct camera")
+reset = digitalio.DigitalInOut(board.GP14)
+cam = adafruit_ov5640.OV5640(
+    i2c,
+    data_pins=(
+        board.GP6,
+        board.GP7,
+        board.GP8,
+        board.GP9,
+        board.GP10,
+        board.GP11,
+        board.GP12,
+        board.GP13,
+    ),
+    clock=board.GP3,
+    vsync=board.GP0,
+    href=board.GP2,
+    mclk=None,
+    shutdown=None,
+    reset=reset,
+    size=adafruit_ov5640.OV5640_SIZE_VGA,
+)
+print("print chip id")
+print(cam.chip_id)
+
+keys = keypad.Keys((board.GP22,), value_when_pressed=False, pull=True)
+
+
+def exists(filename):
+    try:
+        os.stat(filename)
+        return True
+    except OSError as _:
+        return False
+
+
+_image_counter = 0
+
+
+def open_next_image():
+    global _image_counter  # pylint: disable=global-statement
+    while True:
+        filename = f"/sd/img{_image_counter:04d}.jpg"
+        _image_counter += 1
+        if exists(filename):
+            continue
+        print("# writing to", filename)
+        return open(filename, "wb")
+
+
+cam.colorspace = adafruit_ov5640.OV5640_COLOR_JPEG
+cam.quality = 3
+b = bytearray(cam.capture_buffer_size)
+
+cam.autofocus()
+print("AF Status: ", cam.autofocus_status, cam.autofocus_vcm_step)
+
+jpeg = cam.capture(b)
+
+while True:
+    shutter = keys.events.get()
+    # event will be None if nothing has happened.
+    if shutter:
+        if shutter.pressed:
+            """Captures an image and send it to Adafruit IO."""
+            step = int(input("enter AF step:"))
+            if step > 255:
+                # Force autofocus and capture a JPEG image
+                cam.autofocus()
+                print("AF Status: ", cam.autofocus_status, cam.autofocus_vcm_step)
+            else:
+                cam.autofocus_vcm_step = step
+            print("AF Status: ", cam.autofocus_status, cam.autofocus_vcm_step)
+            time.sleep(0.01)
+            jpeg = cam.capture(b)
+            print(f"Captured {len(jpeg)} bytes of jpeg data")
+            print(f" (had allocated {cam.capture_buffer_size} bytes")
+            print(f"Resolution {cam.width}x{cam.height}")
+            try:
+                with open_next_image() as f:
+                    f.write(jpeg)
+                print("# Wrote image")
+            except OSError as e:
+                print(e)

pyproject.toml

@@ -38,7 +38,7 @@ classifiers = [
 dynamic = ["dependencies", "optional-dependencies"]
 
 [tool.setuptools]
-py-modules = ["adafruit_ov5640"]
+packages = ["adafruit_ov5640"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}