在 raspberry pi pico 上体验 MicroPython

2021/6/11 12:24:17

编程Tag： interface device USB descriptor pi MicroPython 0x00 raspberry

本文主要是介绍在 raspberry pi pico 上体验 MicroPython，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

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

Raspberry Pi Pico Python SDK
Get Started with MicroPython on Raspberry Pi Pico

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

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