在 raspberry pi pico 上體驗 MicroPython
阿新 • • 發佈：2021-06-11
raspberry pi pico 官方提供 2 種開發方式，其中一種是使用 python3 開發，樹莓派提供了 MicroPython 韌體，把這個韌體燒錄進去，就可以 在 pico 上跑 python3 指令碼。
1、MicroPython 相關資源
用 python 開發，官網能找到的資源有：1、MicroPython 韌體
-
已經編譯好的韌體：getting-started這裡可以下載到
-
原始碼：micropython‘s github，micropython已經對 RP2040 進行支援
2、文件
3、MicroPython 例程
raspberrypi 官方 github 上有相關例程：pico-micropython-examples
2、下載、燒錄 MicroPython 韌體
樹莓派官網提供了編譯好的 MicroPython 韌體，也可以自己編譯, Raspberry Pi Pico Python SDK 給出了編譯教程。
這裡直接使用官方編譯好的韌體，下載下來是這樣的：
先按住板子上的按鍵，然後連上電腦，等電腦出現名字為 RPI-RP2的磁碟時，把下載到的韌體拷貝到該磁碟，等拷貝完成就燒錄好了，燒錄完，裝置會自動重新啟動，然後我的電腦上出現了這個：
裝置管理器中多了個 COM 口：
PC上可以使用串列埠終端通過該 COM 口操作 pico。
3、使用 MobaXterm 操作 pico
我是用的串列埠終端是 MobaXterm，MobaXterm 什麼？MobaXterm 官網的描述是：
Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
可以建立SSH、Telnet 、串列埠終端等等，功能釋放強大，有免費版、也有收費的，免費的夠用了。
建立一個串列埠終端連線跑 MicroPython 的 pico，選擇對應的 COM 口，波特率115200，如下：
點選 OK 後，介面烏漆嘛黑，什麼都沒有，需要按下回車，然後就可以進行操作了，如下：
4、點燈
點下燈，從原理圖看，是 GPIO25 控制 LED：在MobaXterm 執行一下 python 程式碼，就可以點亮板子上的 LED 了：
from machine import Pin
led = Pin(25, Pin.OUT)
led.value(1)
5、附上 pico 跑 MicroPython 是 USB 相關資訊
[Port2] : USB Composite Device
---===>Device Information<===---
English product name: "Board in FS mode"
ConnectionStatus:
Current Config Value: 0x01 -> Device Bus Speed: Full
Device Address: 0x15
Open Pipes: 3
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x81 -> Direction: IN - EndpointID: 1
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0008 = 0x08 bytes
bInterval: 0x10
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x02 -> Direction: OUT - EndpointID: 2
bmAttributes: 0x02 -> Bulk Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x00
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x02 -> Bulk Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x00
===>Device Descriptor<===
bLength: 0x12
bDescriptorType: 0x01
bcdUSB: 0x0200
bDeviceClass: 0xEF -> This is a Multi-interface Function Code Device
bDeviceSubClass: 0x02 -> This is the Common Class Sub Class
bDeviceProtocol: 0x01 -> This is the Interface Association Descriptor protocol
bMaxPacketSize0: 0x40 = (64) Bytes
idVendor: 0x2E8A = Vendor ID not listed with USB.org as of 03-19-2008
idProduct: 0x0005
bcdDevice: 0x0100
iManufacturer: 0x01
English (United States) "MicroPython"
iProduct: 0x02
English (United States) "Board in FS mode"
iSerialNumber: 0x03
English (United States) "000000000000"
bNumConfigurations: 0x01
===>Configuration Descriptor<===
bLength: 0x09
bDescriptorType: 0x02
wTotalLength: 0x004B -> Validated
bNumInterfaces: 0x02
bConfigurationValue: 0x01
iConfiguration: 0x00
bmAttributes: 0xA0 -> Bus Powered
MaxPower: 0x7D = 250 mA
===>IAD Descriptor<===
bLength: 0x08
bDescriptorType: 0x0B
bFirstInterface: 0x00
bInterfaceCount: 0x02
bFunctionClass: 0x02 -> This is Communications (CDC Control) USB Device Interface Class
bFunctionSubClass: 0x02
bFunctionProtocol: 0x00
iFunction: 0x00
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x01
bInterfaceClass: 0x02 -> This is Communications (CDC Control) USB Device Interface Class
bInterfaceSubClass: 0x02
bInterfaceProtocol: 0x00
CAUTION: This may be an invalid bInterfaceProtocol
iInterface: 0x04
English (United States) "Board CDC"
-> This is a Communications (CDC Control) USB Device Interface Class
===>Descriptor Hex Dump<===
bLength: 0x05
bDescriptorType: 0x24
05 24 00 20 01
-> This is a Communications (CDC Control) USB Device Interface Class
===>Descriptor Hex Dump<===
bLength: 0x05
bDescriptorType: 0x24
05 24 01 00 01
-> This is a Communications (CDC Control) USB Device Interface Class
===>Descriptor Hex Dump<===
bLength: 0x04
bDescriptorType: 0x24
04 24 02 02
-> This is a Communications (CDC Control) USB Device Interface Class
===>Descriptor Hex Dump<===
bLength: 0x05
bDescriptorType: 0x24
05 24 06 00 01
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x81 -> Direction: IN - EndpointID: 1
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0008 = 0x08 bytes
bInterval: 0x10
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x01
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0x0A -> This is a CDC Data USB Device Interface Class
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
CAUTION: This may be an invalid bInterfaceProtocol
iInterface: 0x00
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x02 -> Direction: OUT - EndpointID: 2
bmAttributes: 0x02 -> Bulk Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x00
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x02 -> Bulk Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x00