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美國原廠 RP2040+MCP2515 CAN Bus開發板（ada5724）STEMMA QT/QwiiC 接口
Adafruit RP2040 CAN Bus Feather with MCP2515 CAN Controller - STEMMA QT/QwiiC
帶有 MCP2515 CAN 控制器的 Adafruit RP2040 CAN 總線 Feather - STEMMA QT
2020/3/4新版影片（從1:55開始）：https://youtu.be/MEkKPNr-KBk
What is STEMMA QT 影片說明： https://youtu.be/6GXRRuFuFy0
Description
If you'd like quickly get started with CAN bus interfacing, with no soldering required, our Adafruit RP2040 CAN Bus Feather comes ready-to-rock with a microcontroller, CAN chipset, and terminal blocks for instant gratification. The controller used is the MCP25625 (aka an MCP2515 with built-in transceiver), an extremely popular and well-supported chipset that has drivers in Arduino and CircuitPython and only requires an SPI port and two pins for chip-select and IRQ. Use it to send and receive messages in either standard or extended format at up to 1 Mbps.
Feather is the development board specification from Adafruit, and like its namesake, it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores. We have other boards in the Feather family, check'em out here.
CAN Bus is a small-scale networking standard, originally designed for cars and, yes, busses, but is now used for many robotics or sensor networks that need better range and addressing than I2C and don't have the pins or computational ability to talk on Ethernet. CAN is 2 wire differential, which means it's good for long distances and noisy environments.
Messages are sent at about 1Mbps rate - you set the frequency for the bus and then all 'joiners' must match it, and have an address before the packet so that each node can listen in to messages just for it. New nodes can be attached easily because they just need to connect to the two data lines anywhere in the shared net. Each CAN device sends messages whenever it wants, and thanks to some clever data encoding, can detect if there's a message collision and retransmit later.
We've added a few nice extras to this Feather to make it useful in many common CAN scenarios:
- 5V charge-pump voltage generator, so even though you are running 3.3V on a Feather board, it will generate a nice clean 5V as required by the interal transceiver.
- 3.5mm soldered terminal block quick access to the High and Low data lines as well as a ground pin, without any soldering.
- 120-ohm termination resistor on board, you can remove the termination easily by cutting the jumper marked TERM on the top of the board.
- CAN control CS, Reset, Int, standby pins connected internally so you can use any FeatherWing without pin conflicts.
At the Feather's heart is an RP2040 chip, clocked at 133 MHz and at 3.3V logic, the same one used in the Raspberry Pi Pico. This chip has a whopping 8 MB of onboard QSPI FLASH and 264K of RAM! There's even room left over for a STEMMA QT connector for plug-and-play of I2C devices.
To make it easy to use for portable projects, we added a connector for any of our 3.7V Lithium polymer batteries and built-in battery charging. You don't need a battery, it will run just fine straight from the USB Type C connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when it's available.／為了便於在攜帶型專案中使用，我們為任何 3.7V 鋰聚合物電池和內置電池充電添加了一個連接器。您不需要電池，它可以直接從USB C型連接器運行。但是，如果您有電池，則可以隨身攜帶，然後插入USB充電。羽毛將在可用時自動切換到USB電源。
Here's some handy specs! Like all Feather 32u4's you get:
- Measures 2.0" x 0.9" x 0.28" (50.8mm x 22.8mm x 7mm) without headers soldered in
- Light as a (large?) feather - 6.3 grams
- RP2040 32-bit Cortex M0+ dual core running at ~133 MHz @ 3.3V logic and power
- 264 KB RAM
- 8 MB SPI FLASH chip for storing files, images and CircuitPython/MicroPython code storage. No EEPROM
- Tons of GPIO! 21 x GPIO pins with following capabilities:
- Four 12-bit ADCs (one more than Pico)
- Two I2C, Two SPI, and two UART peripherals, we label one for the 'main' interface in standard Feather locations
- 16 x PWM outputs - for servos, LEDs, etc
- Built-in 200mA+ lipoly charger with charging status indicator LED
- Pin #13 red LED for general purpose blinking
- RGB NeoPixel for full-color indication.
- On-board STEMMA QT connector that lets you quickly connect any Qwiic, STEMMA QT or Grove I2C devices with no soldering!
- Both Reset button and Bootloader select button for quick restarts (no unplugging-replugging to relaunch code)
- USB Type C connector lets you access built-in ROM USB bootloader and serial port debugging
- 3.3V regulator with 500mA peak current output and power enable pin
- 4 mounting holes
- 12 MHz crystal for perfect timing.
- Support circuitry for CAN Bus using SPI interface
Comes assembled and tested, with some header. You'll need a soldering iron to attach the header for installing onto your Feather. Stacking headers will let you put another FeatherWing on top.／已組裝並經過測試，帶有一些接頭。您需要一個烙鐵來連接接頭，以便安裝到您的 Feather 上。堆疊標題可以讓您在頂部放置另一個 FeatherWing。
