Merge pull request #4 from adafruit/internal-storage-example

Internal storage example

adafruit_ov5640.py

@@ -1165,14 +1165,14 @@ def effect(self, value):
 
     @property
     def quality(self):
-        """Controls the JPEG quality.  Valid range is from 5..55 inclusive"""
+        """Controls the JPEG quality.  Valid range is from 2..55 inclusive"""
         return self._read_register(_COMPRESSION_CTRL07) & 0x3F
 
     @quality.setter
     def quality(self, value: int):
-        if not 5 <= value < 55:
+        if not 2 <= value < 55:
             raise ValueError(
-                f"Invalid quality value {value}, use a value from 5..55 inclusive"
+                f"Invalid quality value {value}, use a value from 2..55 inclusive"
             )
         self._write_register(_COMPRESSION_CTRL07, value & 0x3F)
 

examples/ov5640_directio_kaluga1_3_ili9341.py

@@ -16,15 +16,11 @@
 the one which usually uses rotation=90 to get a landscape display.
 """
 
-import os
 import struct
 
-import analogio
 import board
 import busio
 import displayio
-import sdcardio
-import storage
 import adafruit_ov5640
 
 # Release any resources currently in use for the displays

examples/ov5640_jpeg_kaluga1_3.py

@@ -10,17 +10,45 @@
 The audio board must be mounted between the Kaluga and the LCD, it provides the
 I2C pull-ups(!)
 
-You also need to place ov5640_jpeg_kaluga1_3_boot.py at CIRCUITPY/boot.py
-and reset the board to make the internal flash readable by CircuitPython.
-You can make CIRCUITPY readable from your PC by booting CircuitPython in
-safe mode or holding the "MODE" button on the audio daughterboard while
-powering on or resetting the board.
+You also need to place ov5640_jpeg_kaluga1_3_boot.py at CIRCUITPY/boot.py.
+Then, hold the Mode button (button K2 on the audio board) while resetting the
+board to make the internal flash readable by CircuitPython.
 """
 
+import time
+
 import board
 import busio
+import displayio
+import microcontroller
+
+import adafruit_ili9341
 import adafruit_ov5640
 
+# Release any resources currently in use for the displays
+displayio.release_displays()
+spi = busio.SPI(MOSI=board.LCD_MOSI, clock=board.LCD_CLK)
+display_bus = displayio.FourWire(
+    spi,
+    command=board.LCD_D_C,
+    chip_select=board.LCD_CS,
+    reset=board.LCD_RST,
+    baudrate=80_000_000,
+)
+display = adafruit_ili9341.ILI9341(display_bus, width=320, height=240, rotation=90)
+
+try:
+    with open("/boot_out.txt", "ab") as f:
+        pass
+except OSError as e:
+    print(e)
+    print(
+        "A 'read-only filesystem' error occurs if you did not correctly install"
+        "\nov5640_jpeg_kaluga1_3_boot.py as CIRCUITPY/boot.py and reset the"
+        '\nboard while holding the "mode" button'
+        "\n\nThis message is also shown after the board takes a picture and auto-restarts"
+    )
+    raise SystemExit from e
 
 bus = busio.I2C(scl=board.CAMERA_SIOC, sda=board.CAMERA_SIOD)
 cam = adafruit_ov5640.OV5640(
@@ -30,22 +58,31 @@
     vsync=board.CAMERA_VSYNC,
     href=board.CAMERA_HREF,
     mclk=board.CAMERA_XCLK,
-    mclk_frequency=20_000_000,
-    size=adafruit_ov5640.OV5640_SIZE_QVGA,
+    size=adafruit_ov5640.OV5640_SIZE_QSXGA,
 )
 
 cam.colorspace = adafruit_ov5640.OV5640_COLOR_JPEG
+cam.quality = 5
 b = bytearray(cam.capture_buffer_size)
+print(f"Capturing jpeg image of up to {len(b)} bytes")
 jpeg = cam.capture(b)
 
 print(f"Captured {len(jpeg)} bytes of jpeg data")
 try:
-    with open("/jpeg.jpg", "wb") as f:
-        f.write(jpeg)
+    print(end="Writing to internal storage (this is SLOW)")
+    with open("/cam.jpg", "wb") as f:
+        for i in range(0, len(jpeg), 4096):
+            print(end=".")
+            f.write(jpeg[i : i + 4096])
+    print()
+    print("Wrote to CIRCUITPY/cam.jpg")
+    print("Resetting so computer sees new content of CIRCUITPY")
+    time.sleep(0.5)
+    microcontroller.reset()  # pylint: disable=no-member
+
 except OSError as e:
     print(e)
     print(
         "A 'read-only filesystem' error occurs if you did not correctly install"
         "\nov5640_jpeg_kaluga1_3_boot.py as CIRCUITPY/boot.py and reset the board"
     )
-print("Wrote to CIRCUITPY/jpeg.jpg")

examples/ov5640_jpeg_kaluga1_3_boot.py

@@ -5,7 +5,7 @@
 """Use this file as CIRCUITPY/boot.py in conjunction with ov5640_jpeg_kaluga1_3.py
 
 It makes the CIRCUITPY filesystem writable to CircuitPython
-(and read-only to the PC) unless the "MODE" button on the audio
+(and read-only to the PC) if the "MODE" button on the audio
 daughterboard is held while the board is powered on or reset.
 """
 
@@ -18,6 +18,7 @@
 
 a = analogio.AnalogIn(board.IO6)
 a_voltage = a.value * a.reference_voltage / 65535  # pylint: disable=no-member
-if abs(a_voltage - V_MODE) > 0.05:  # If mode is NOT pressed...
+print("measured voltage", a_voltage)
+if abs(a_voltage - V_MODE) < 0.05:  # If mode IS pressed...
     print("storage writable by CircuitPython")
     storage.remount("/", readonly=False)

examples/ov5640_sdcard_kaluga_1_3.py

@@ -21,15 +21,30 @@
 """
 
 import os
-
 import time
+
 import analogio
 import board
 import busio
-import adafruit_ov5640
+import displayio
 import neopixel
-import storage
 import sdcardio
+import storage
+
+import adafruit_ili9341
+import adafruit_ov5640
+
+# Release any resources currently in use for the displays
+displayio.release_displays()
+spi = busio.SPI(MOSI=board.LCD_MOSI, clock=board.LCD_CLK)
+display_bus = displayio.FourWire(
+    spi,
+    command=board.LCD_D_C,
+    chip_select=board.LCD_CS,
+    reset=board.LCD_RST,
+    baudrate=80_000_000,
+)
+display = adafruit_ili9341.ILI9341(display_bus, width=320, height=240, rotation=90)
 
 V_MODE = 1.98
 V_RECORD = 2.41
@@ -60,15 +75,15 @@ def exists(filename):
     try:
         os.stat(filename)
         return True
-    except OSError as e:
+    except OSError as _:
         return False
 
 
 _image_counter = 0
 
 
 def open_next_image():
-    global _image_counter
+    global _image_counter  # pylint: disable=global-statement
     while True:
         filename = f"/sd/img{_image_counter:04d}.jpg"
         _image_counter += 1
@@ -86,15 +101,16 @@ def open_next_image():
 while True:
     pixel[0] = 0x0000FF
     pixel.write()
-    a_voltage = a.value * a.reference_voltage / 65535
+    a_voltage = a.value * a.reference_voltage / 65535  # pylint: disable=no-member
     record_pressed = abs(a_voltage - V_RECORD) < 0.05
     if record_pressed:
         pixel[0] = 0xFF0000
         pixel.write()
         time.sleep(0.01)
         jpeg = cam.capture(b)
         print(
-            f"Captured {len(jpeg)} bytes of jpeg data (had allocated {cam.capture_buffer_size} bytes"
+            f"Captured {len(jpeg)} bytes of jpeg data"
+            f" (had allocated {cam.capture_buffer_size} bytes"
         )
         print(f"Resolution {cam.width}x{cam.height}")
         try:
@@ -108,5 +124,7 @@ def open_next_image():
         except OSError as e:
             print(e)
         while record_pressed:
-            a_voltage = a.value * a.reference_voltage / 65535
+            a_voltage = (
+                a.value * a.reference_voltage / 65535
+            )  # pylint: disable=no-member
             record_pressed = abs(a_voltage - V_RECORD) < 0.05