docs/openmvcam: Polish Arduino board quickref pages.

Reworked the Nicla Vision, Portenta H7, and Giga R1 WiFi quickref pages
to a consistent direct/reference style: comprehensive pin reference
tables, separated power / battery / power-path sections, full
PWM/UART/I²C/SPI/CAN bus tables, M4 core (open-amp) sections, and
documented Vision-Shield- and Display-Shield-specific peripherals
(camera, LoRa, Ethernet, microSD, GT911 touch, BMI270 IMU, IS31FL3197
RGB LED, audio jack DAC line-out and analog mic on A7).

Also tightened the boot/runtime info on every STM32 board: matched
'Arduino bootloader' wording, added the USB MSC block-device caching
note and the red-LED activity note where applicable, and split the
SD-card override / SKIPSD paragraphs to mirror the RT1062 layout.

Author: kwagyeman

docs/openmvcam/pinout-arduino-portenta-h7.png

@@ -274,6 +274,9 @@ The on‑board MP34DT05 PDM microphone is captured through
     audio.init(channels=1, frequency=16000, gain_db=24)
     audio.start_streaming(loudness)
 
+    while True:
+        pass
+
 Bluetooth LE
 ~~~~~~~~~~~~
 
@@ -510,6 +513,16 @@ drive on the host, letting you edit ``boot.py``, ``main.py``, and any
 other files directly. **Eject the drive before resetting the board**
 so the host flushes its cached writes.
 
+Storage sizes
+~~~~~~~~~~~~~
+
+The Nano 33 BLE Sense ships with:
+
+* ``/flash`` — **64 KB** FAT filesystem, read/write.
+
+The Nano 33 BLE Sense build does not include a ROMFS; ship Python
+modules on ``/flash`` directly.
+
 Software libraries
 ------------------
 

docs/openmvcam/quickref/arduino-giga-r1-wifi.rst

@@ -13,8 +13,8 @@ The Arduino Nano RP2040 Connect is a 45 × 18 mm Arduino‑Nano‑form‑factor
 board built around the Raspberry Pi RP2040 — a dual ARM Cortex‑M0+
 running at 133 MHz with 264 KB of internal SRAM. Wireless and BLE
 come from a U‑blox NINA‑W102 module, and the board carries an LSM6DSOX
-6‑axis IMU, an MP34DT06 PDM microphone, and an ATECC608A secure
-element. Compared with the OpenMV camera boards, the Nano RP2040
+6‑axis IMU and an MP34DT06 PDM microphone. Compared with the
+OpenMV camera boards, the Nano RP2040
 Connect has **no on‑board image sensor** — the OpenMV firmware here
 is mostly used for sensor fusion, audio capture, and wireless work.
 
@@ -39,7 +39,6 @@ Highlights
   the frozen :class:`lsm6dsox.LSM6DSOX` driver.
 * **MP34DT06** PDM microphone captured through PIO using
   :doc:`/library/omv.audio`.
-* **ATECC608A** secure element on the same I²C bus as the IMU.
 * **20 user I/O pins** on the standard Nano headers — D2–D13
   (digital) plus A0–A7 (analog). Four of the analog pins (A4–A7)
   route through the NINA module's I/O extender.
@@ -175,7 +174,7 @@ IMU
 ~~~
 
 The on‑board LSM6DSOX 6‑axis accelerometer + gyroscope sits on
-``I2C0`` (the same bus as the secure element). The rp2 port's
+``I2C0``. The rp2 port's
 ``machine.I2C(0)`` defaults to a different pin set, so pass the
 silkscreened ``SDA``/``SCL`` pads explicitly. Use the frozen
 :class:`lsm6dsox.LSM6DSOX` driver::
@@ -210,6 +209,9 @@ The on‑board MP34DT06 PDM microphone is captured through
     audio.init(channels=1, frequency=16000, gain_db=24)
     audio.start_streaming(loudness)
 
+    while True:
+        pass
+
 Wi‑Fi
 ~~~~~
 
@@ -315,9 +317,8 @@ works without explicit pins — using ``A0``/``A1`` as I²C consumes
 those pins for the bus, so you can't simultaneously use them as ADC
 inputs.
 
-The on‑board IMU and secure element share **bus 0**; user I²C devices
-on the same bus must avoid the LSM6DSOX address (``0x6A``) and the
-ATECC608A address (``0x60``).
+The on‑board IMU sits on **bus 0**; user I²C devices on the same
+bus must avoid the LSM6DSOX address (``0x6A``).
 
 SPI
 ~~~
@@ -480,6 +481,16 @@ drive on the host, letting you edit ``boot.py``, ``main.py``, and any
 other files directly. **Eject the drive before resetting the board**
 so the host flushes its cached writes.
 
+Storage sizes
+~~~~~~~~~~~~~
+
+The Nano RP2040 Connect ships with:
+
+* ``/flash`` — **14 MB** FAT filesystem, read/write.
+
+The Nano RP2040 build does not include a ROMFS; ship Python
+modules and ML models on ``/flash`` directly.
+
 Software libraries
 ------------------
 

docs/openmvcam/quickref/arduino-nano-33-ble-sense.rst

@@ -31,7 +31,8 @@ Highlights
   microphone** (MP34DT06JTR), and **VL53L1CB** time‑of‑flight ranger
   (up to ~4 m).
 * **Wi‑Fi b/g/n** (2.4 GHz) + **Bluetooth LE 5.1** via the Murata
-  1DX (CYW4343W) module — uses the supplied **U.FL antenna**.
+  1DX (CYW4343W) module — connects to the supplied antenna via an
+  on‑board **U.FL connector**.
 * **High‑speed USB** (480 Mb/s) over **Micro USB** through an
   external ULPI PHY (USB3320C).
 * **13 user I/O pins** on the Arduino edge headers — four digital
@@ -174,7 +175,7 @@ Recovery and debug pins
   reset.
 
 The Nicla Vision uses Arduino's standard **double‑tap reset** to
-enter the STM32H747 ROM bootloader — quickly press the reset button
+enter Arduino's bootloader — quickly press the reset button
 twice and the board enumerates as a DFU device. OpenMV IDE uses this
 mode to reflash the firmware.
 
@@ -185,7 +186,7 @@ adapter:
 
 * **P1 / P2** — internal **PMIC** I²C bus on PF0 (SDA) and PF1
   (SCL). This is ``machine.I2C(2)`` on the Nicla Vision and carries
-  the PMIC, fuel gauge, ToF, and crypto element traffic.
+  the PMIC, fuel gauge, and ToF traffic.
 * **P3** — TMS / SWDIO  (PA13)
 * **P4** — TCK / SWCLK  (PA14)
 * **P5** — NRST
@@ -234,8 +235,52 @@ The GC2145 is driven through the :doc:`/library/omv.csi` module::
     while True:
         img = cam.snapshot()
 
-The sensor is connected by a small flex cable to a connector on the
-back of the board.
+When you ask for a small framesize the GC2145 driver crops a
+proportionally small readout window from the sensor — by default
+the readout-to-output downscale ratio is capped at 3x to keep the
+frame rate up. `csi.IOCTL_SET_FOV_WIDE` raises that cap to 5x,
+which means the driver pulls from a wider area of the sensor when
+streaming small resolutions. The result is a noticeably wider field
+of view at small framesizes, at the cost of some throughput::
+
+    cam.ioctl(csi.IOCTL_SET_FOV_WIDE, True)
+    cam.ioctl(csi.IOCTL_GET_FOV_WIDE)  # returns the current setting
+
+M4 core
+~~~~~~~
+
+The Cortex‑M4 core is exposed through :doc:`openamp </library/openamp>`
+for inter‑processor communication. The OpenMV firmware runs on the
+M7 only; the M4 has no MicroPython runtime of its own, so using it
+means building a separate C firmware image and loading it from the
+filesystem via :class:`openamp.RemoteProc`.
+Pre‑built example firmware that implements a virtual UART endpoint
+is available in the
+`openamp_vuart <https://github.com/iabdalkader/openamp_vuart>`_
+repository — follow its README to build ``vuart.elf``::
+
+    import openamp
+    import time
+
+    def ept_recv_callback(src_addr, data):
+        print("Received:", data.decode())
+
+    ept = openamp.Endpoint("vuart-channel", callback=ept_recv_callback)
+
+    rproc = openamp.RemoteProc("vuart.elf")
+    rproc.start()
+
+    count = 0
+    while True:
+        if ept.is_ready():
+            ept.send("Hello World %d!" % count, timeout=1000)
+            count += 1
+        time.sleep_ms(1000)
+
+In practice this support is best treated as a demonstration of the
+openamp interface rather than a working dual‑core platform — the
+M4 cannot be reset independently of the M7, so stopping the M4
+forces a full system reboot.
 
 Microphone
 ~~~~~~~~~~
@@ -258,6 +303,9 @@ example, a simple loudness detector::
     audio.init(channels=1, frequency=16000, gain_db=24)
     audio.start_streaming(loudness)
 
+    while True:
+        pass
+
 IMU
 ~~~
 
@@ -438,7 +486,7 @@ Wi‑Fi
 
 The on‑board Murata 1DX (CYW4343W) is exposed via
 :doc:`/library/network` as a station interface. Connect the supplied
-**U.FL antenna** to the ``J6`` connector before bringing up the
+antenna to the on‑board **U.FL connector** before bringing up the
 radio::
 
     import network, time
@@ -716,7 +764,7 @@ Firmware update (DFU)
 ~~~~~~~~~~~~~~~~~~~~~
 
 The Nicla Vision uses Arduino's standard **double‑tap reset** to
-enter the STM32H747 ROM bootloader. Quickly press the reset button
+enter Arduino's bootloader. Quickly press the reset button
 twice — the board re‑enumerates over USB as a DFU device and OpenMV
 IDE can flash a new firmware image.
 
@@ -768,7 +816,25 @@ resetting the camera** so the host flushes its cached writes.
    created or modified by code running on the camera will not show
    up until the host re‑mounts the drive. If both the OS and the
    camera write the same filesystem at the same time, the OS will
-   win and overwrite changes made by the camera.
+   win and overwrite changes made by the camera. Use the SD card for
+   any data the script writes back, and remount before reading those
+   files from the host.
+
+.. note::
+
+   The user RGB LED's **red** channel may briefly light up while the
+   host is reading from or writing to the USB mass‑storage drive —
+   this is a firmware‑driven activity indicator, not a fault.
+
+Storage sizes
+~~~~~~~~~~~~~
+
+The Nicla Vision ships with:
+
+* ``/flash`` — **11 MB** FAT filesystem, read/write.
+* ``/rom`` — **4 MB** read-only memory-mapped ROMFS, used to
+  ship scripts and ML models that benefit from zero-copy mmap
+  access.
 
 Hard‑fault indicator
 ~~~~~~~~~~~~~~~~~~~~