在 raspberry pi pico 上体验 MicroPython

raspberry pi pico 官方提供 2 种开发方式，其中一种是使用 python3 开发，树莓派提供了 MicroPython 固件，把这个固件烧录进去，就可以在 pico 上跑 python3 脚本。

1、MicroPython 相关资源

用 python 开发，官网能找到的资源有：

1、MicroPython 固件

已经编译好的固件：getting-started这里可以下载到
源码：micropython‘s github，micropython已经对 RP2040 进行支持

2、文档

3、MicroPython 例程

raspberrypi 官方 github 上有相关例程：pico-micropython-examples

2、下载、烧录 MicroPython 固件

树莓派官网提供了编译好的 MicroPython 固件，也可以自己编译, Raspberry Pi Pico Python SDK 给出了编译教程。

这里直接使用官方编译好的固件，下载下来是这样的：

先按住板子上的按键，然后连上电脑，等电脑出现名字为 RPI-RP2的磁盘时，把下载到的固件拷贝到该磁盘，等拷贝完成就烧录好了，烧录完，设备会自动重新启动，然后我的电脑上出现了这个：

设备管理器中多了个 COM 口：

PC上可以使用串口终端通过该 COM 口操作 pico。

3、使用 MobaXterm 操作 pico

我是用的串口终端是 MobaXterm，MobaXterm 什么？MobaXterm 官网的描述是：

Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more

可以创建SSH、Telnet 、串口终端等等，功能释放强大，有免费版、也有收费的，免费的够用了。

创建一个串口终端连接跑 MicroPython 的 pico，选择对应的 COM 口，波特率115200，如下：

点击 OK 后，界面乌漆嘛黑，什么都没有，需要按下回车，然后就可以进行操作了，如下：

4、点灯

点下灯，从原理图看，是 GPIO25 控制 LED：

在MobaXterm 执行一下 python 代码，就可以点亮板子上的 LED 了：

from machine import Pin

led = Pin(25, Pin.OUT)

led.value(1)

5、附上 pico 跑 MicroPython 是 USB 相关信息

[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