# SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
#
# SPDX-License-Identifier: MIT
"""
`adafruit_vc0706`
====================================================
VC0706 serial TTL camera module. Allows basic image capture and download of
image data from the camera over a serial connection. See examples for demo
of saving image to a SD card (must be wired up separately).
* Author(s): Tony DiCola
Implementation Notes
--------------------
**Hardware:**
* Adafruit `TTL Serial JPEG Camera with NTSC Video
<https://www.adafruit.com/product/397>`_ (Product ID: 397)
**Software and Dependencies:**
* Adafruit CircuitPython firmware for the ESP8622 and M0-based boards:
https://github.com/adafruit/circuitpython/releases
"""
from micropython import const
__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_VC0706.git"
_SERIAL = const(0x00)
_RESET = const(0x26)
_GEN_VERSION = const(0x11)
_SET_PORT = const(0x24)
_READ_FBUF = const(0x32)
_GET_FBUF_LEN = const(0x34)
_FBUF_CTRL = const(0x36)
_DOWNSIZE_CTRL = const(0x54)
_DOWNSIZE_STATUS = const(0x55)
_READ_DATA = const(0x30)
_WRITE_DATA = const(0x31)
_COMM_MOTION_CTRL = const(0x37)
_COMM_MOTION_STATUS = const(0x38)
_COMM_MOTION_DETECTED = const(0x39)
_MOTION_CTRL = const(0x42)
_MOTION_STATUS = const(0x43)
_TVOUT_CTRL = const(0x44)
_OSD_ADD_CHAR = const(0x45)
_STOPCURRENTFRAME = const(0x0)
_STOPNEXTFRAME = const(0x1)
_RESUMEFRAME = const(0x3)
_STEPFRAME = const(0x2)
# pylint doesn't like the lowercase x but it makes it more readable.
# pylint: disable=invalid-name
IMAGE_SIZE_640x480 = const(0x00)
IMAGE_SIZE_320x240 = const(0x11)
IMAGE_SIZE_160x120 = const(0x22)
# pylint: enable=invalid-name
_BAUDRATE_9600 = const(0xAEC8)
_BAUDRATE_19200 = const(0x56E4)
_BAUDRATE_38400 = const(0x2AF2)
_BAUDRATE_57600 = const(0x1C1C)
_BAUDRATE_115200 = const(0x0DA6)
_MOTIONCONTROL = const(0x0)
_UARTMOTION = const(0x01)
_ACTIVATEMOTION = const(0x01)
__SET_ZOOM = const(0x52)
__GET_ZOOM = const(0x53)
_CAMERA_DELAY = const(10)
[docs]class VC0706:
"""Driver for VC0706 serial TTL camera module.
:param ~busio.UART uart: uart serial or compatible interface
:param int buffer_size: Receive buffer size
"""
def __init__(self, uart, *, buffer_size=100):
self._uart = uart
self._buffer = bytearray(buffer_size)
self._frame_ptr = 0
self._command_header = bytearray(3)
for _ in range(2): # 2 retries to reset then check resetted baudrate
for baud in (9600, 19200, 38400, 57600, 115200):
self._uart.baudrate = baud
if self._run_command(_RESET, b"\x00", 5):
break
else: # for:else rocks! http://book.pythontips.com/en/latest/for_-_else.html
raise RuntimeError("Failed to get response from VC0706, check wiring!")
@property
def version(self):
"""Return camera version byte string."""
# Clear buffer to ensure the end of a string can be found.
self._send_command(_GEN_VERSION, b"\x01")
readlen = self._read_response(self._buffer, len(self._buffer))
return str(self._buffer[:readlen], "ascii")
@property
def baudrate(self):
"""Return the currently configured baud rate."""
return self._uart.baudrate
@baudrate.setter
def baudrate(self, baud):
"""Set the baudrate to 9600, 19200, 38400, 57600, or 115200. """
divider = None
if baud == 9600:
divider = _BAUDRATE_9600
elif baud == 19200:
divider = _BAUDRATE_19200
elif baud == 38400:
divider = _BAUDRATE_38400
elif baud == 57600:
divider = _BAUDRATE_57600
elif baud == 115200:
divider = _BAUDRATE_115200
else:
raise ValueError("Unsupported baud rate")
args = [0x03, 0x01, (divider >> 8) & 0xFF, divider & 0xFF]
self._run_command(_SET_PORT, bytes(args), 7)
self._uart.baudrate = baud
@property
def image_size(self):
"""Get the current image size, will return a value of IMAGE_SIZE_640x480,
IMAGE_SIZE_320x240, or IMAGE_SIZE_160x120.
"""
if not self._run_command(_READ_DATA, b"\0x04\x04\x01\x00\x19", 6):
raise RuntimeError("Failed to read image size!")
return self._buffer[5]
@image_size.setter
def image_size(self, size):
"""Set the image size to a value of IMAGE_SIZE_640x480, IMAGE_SIZE_320x240, or
IMAGE_SIZE_160x120.
"""
if size not in (IMAGE_SIZE_640x480, IMAGE_SIZE_320x240, IMAGE_SIZE_160x120):
raise ValueError(
"Size must be one of IMAGE_SIZE_640x480, IMAGE_SIZE_320x240, or "
"IMAGE_SIZE_160x120!"
)
return self._run_command(
_WRITE_DATA, bytes([0x05, 0x04, 0x01, 0x00, 0x19, size & 0xFF]), 5
)
@property
def frame_length(self):
"""Return the length in bytes of the currently capture frame/picture."""
if not self._run_command(_GET_FBUF_LEN, b"\x01\x00", 9):
return 0
frame_length = self._buffer[5]
frame_length <<= 8
frame_length |= self._buffer[6]
frame_length <<= 8
frame_length |= self._buffer[7]
frame_length <<= 8
frame_length |= self._buffer[8]
return frame_length
[docs] def take_picture(self):
"""Tell the camera to take a picture. Returns True if successful."""
self._frame_ptr = 0
return self._run_command(_FBUF_CTRL, bytes([0x1, _STOPCURRENTFRAME]), 5)
[docs] def resume_video(self):
"""Tell the camera to resume being a camera after the video has stopped
(Such as what happens when a picture is taken).
"""
return self._run_command(_FBUF_CTRL, bytes([0x1, _RESUMEFRAME]), 5)
[docs] def read_picture_into(self, buf):
"""Read the next bytes of frame/picture data into the provided buffer.
Returns the number of bytes written to the buffer (might be less than
the size of the buffer). Buffer MUST be a multiple of 4 and 100 or
less. Suggested buffer size is 32.
"""
n = len(buf)
if n > 256 or n > (len(self._buffer) - 5):
raise ValueError("Buffer is too large!")
if n % 4 != 0:
raise ValueError("Buffer must be a multiple of 4! Try 32.")
args = bytes(
[
0x0C,
0x0,
0x0A,
0,
0,
(self._frame_ptr >> 8) & 0xFF,
self._frame_ptr & 0xFF,
0,
0,
0,
n & 0xFF,
(_CAMERA_DELAY >> 8) & 0xFF,
_CAMERA_DELAY & 0xFF,
]
)
if not self._run_command(_READ_FBUF, args, 5, flush=False):
return 0
if self._read_response(self._buffer, n + 5) == 0:
return 0
self._frame_ptr += n
for i in range(n):
buf[i] = self._buffer[i]
return n
def _run_command(self, cmd, args, resplen, flush=True):
if flush:
self._read_response(self._buffer, len(self._buffer))
self._send_command(cmd, args)
if self._read_response(self._buffer, resplen) != resplen:
return False
if not self._verify_response(cmd):
return False
return True
def _read_response(self, result, numbytes):
return self._uart.readinto(memoryview(result)[0:numbytes])
def _verify_response(self, cmd):
return (
self._buffer[0] == 0x76
and self._buffer[1] == _SERIAL
and self._buffer[2] == cmd & 0xFF
and self._buffer[3] == 0x00
)
def _send_command(self, cmd, args=None):
self._command_header[0] = 0x56
self._command_header[1] = _SERIAL
self._command_header[2] = cmd & 0xFF
self._uart.write(self._command_header)
if args:
self._uart.write(args)