adding PiCowbell Camera examples

Adding a TFT viewer and JPEG capture example for the PiCowbell Camera

Author: BlitzCityDIY

PiCowbell_Camera_Demos/JPEG_Capture/code.py

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+# 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
+
+It take an image when the shutter button is pressed and saves it to
+the microSD card.
+"""
+
+import os
+import time
+import busio
+import board
+import digitalio
+import adafruit_ov5640
+import keypad
+import sdcardio
+import storage
+
+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)
+jpeg = cam.capture(b)
+
+while True:
+    shutter = keys.events.get()
+    # event will be None if nothing has happened.
+    if shutter:
+        if shutter.pressed:
+            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)

PiCowbell_Camera_Demos/TFT_Viewer/code.py

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+# SPDX-FileCopyrightText: Copyright (c) 2023 Limor Fried for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+"""
+This demo is designed for the Raspberry Pi Pico, Camera PiCowbell,
+and ST7789 240x240 SPI TFT display
+
+It shows the camera image on the LCD
+"""
+
+import time
+import busio
+import board
+import digitalio
+import adafruit_ov5640
+import adafruit_st7789
+import displayio
+
+displayio.release_displays()
+spi = busio.SPI(clock=board.GP18, MOSI=board.GP19)
+display_bus = displayio.FourWire(spi, command=board.GP21, chip_select=board.GP17, reset=None)
+display = adafruit_st7789.ST7789(display_bus, width=240, height=240, rowstart=80, rotation=0)
+
+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_240X240,
+)
+print("print chip id")
+print(cam.chip_id)
+
+
+cam.colorspace = adafruit_ov5640.OV5640_COLOR_RGB
+cam.flip_y = False
+cam.flip_x = False
+cam.test_pattern = False
+
+width = display.width
+height = display.height
+
+#cam.test_pattern = OV7670_TEST_PATTERN_COLOR_BAR_FADE
+bitmap = displayio.Bitmap(cam.width, cam.height, 65535)
+print(width, height, cam.width, cam.height)
+if bitmap is None:
+    raise SystemExit("Could not allocate a bitmap")
+
+g = displayio.Group(scale=1, x=(width-cam.width)//2, y=(height-cam.height)//2)
+tg = displayio.TileGrid(bitmap,
+    pixel_shader=displayio.ColorConverter(input_colorspace=displayio.Colorspace.RGB565_SWAPPED)
+)
+g.append(tg)
+display.root_group = g
+
+t0 = time.monotonic_ns()
+display.auto_refresh = False
+while True:
+    cam.capture(bitmap)
+    bitmap.dirty()
+    display.refresh(minimum_frames_per_second=0)
+    t1 = time.monotonic_ns()
+    print("fps", 1e9 / (t1 - t0))
+    t0 = t1