esp32-micropython

本来之前买和另一贴子的esp8266一起买了一块esp32.

现在开发esp的大概有乐鑫的ide以及基于乐鑫定制的、arduino、nodemcu、还有就是现在要讲的micropython.

乐鑫的主要跑ucos，arduino版本顾名思义，nodemcu用lua脚本语言，micropython用定制的python。

每一种都或多或少接触过，偶然的时候在NDIY论坛看到F4跑micropython，用python语言干单片机的活，然后就百度了下。

感觉如果拿来做轻量开发十分方便，比arduino还方便。恰好身边也有人在学python，学好了还可以介绍给他们。

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http://www.eeboard.com/evaluation/pyboard/

这个帖子写的是pyboard评测，从中可以看出micropython的特点。

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官方自己下的定义：

MicroPython - a lean and efficient Python implementation for microcontrollers and constrained systems 
https://micropython.org

以下是安装步骤：

先安装esptool.py

pip install esptool.py

没装pip先sudo apt装好pip

然后不知道为什么我默认安装到/home/xxx/.local/bin/这个目录里面了，百度过来都是直接pip好了就能用，然后我locate esptool找到了脚本的位置，

然后在.bashrc里面alias esptool="/home/xxx/.local/bin/esptool.py"然后source一下就行了.

先按照官网说的:

Firmware for ESP32 boards
The following files are daily firmware for ESP32-based boards, with separate firmware for boards with and without external SPIRAM. Non-SPIRAM firmware will work on any board, whereas SPIRAM enabled firmware will only work on boards with 4MiB of external pSRAM.

Program your board using the esptool.py program, and put the firmware starting at address 0x1000. For example: esptool.py --chip esp32 --port /dev/ttyUSB1 write_flash -z 0x1000 esp32-20180511-v1.9.4.bin. If you are putting MicroPython on for the first time then you should first erase the entire flash using esptool.py --chip esp32 erase_flash.

清除flash

katachi@katachi-Inspiron-:~/eclipse-workspace/micropython$ esptool --chip esp32 --port /dev/ttyUSB0 erase_flash
esptool.py v2.5.0
Serial port /dev/ttyUSB0
Connecting........__
Chip is ESP32D0WDQ6 (revision )
Features: WiFi, BT, Dual Core
MAC: :ae:a4:3a:1b:9c
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in .6s
Hard resetting via RTS pin...
katachi@katachi-Inspiron-:~/eclipse-workspace/micropython$ 

然后刷进去:

katachi@katachi-Inspiron-:~/eclipse-workspace/micropython$ esptool --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 esp32spiram--v1.9.4--g5cd2c7f2e.bin
esptool.py v2.5.0
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP32D0WDQ6 (revision )
Features: WiFi, BT, Dual Core
MAC: :ae:a4:3a:1b:9c
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed  bytes to ...
Wrote  bytes ( compressed) at 0x00001000 in 60.7 seconds (effective 147.1 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

刷的是带ram的,但是rst后报错,然后刷了不带ram的就启动了,用串口连接,是一个叫REPL(read evaluate print loop)的交互bash,

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err,
ets_main.c
ets Jun    ::

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: , SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:
load:0x3fff0018,len:
load:0x3fff001c,len:
load:0x40078000,len:
load:0x40080400,len:
entry 0x4008114c
I () cpu_start: Pro cpu up.
I () cpu_start: Single core mode
I () heap_init: Initializing. RAM available for dynamic allocation:
I () heap_init: At 3FFAE6E0 len  ( KiB): DRAM
I () heap_init: At 3FFC4F48 len 0001B0B8 ( KiB): DRAM
I () heap_init: At 3FFE0440 len 00003BC0 ( KiB): D/IRAM
I () heap_init: At 3FFE4350 len 0001BCB0 ( KiB): D/IRAM
I () heap_init: At  len 0000EBB8 ( KiB): IRAM
I () cpu_start: Pro cpu start user code
I () cpu_start: Starting scheduler on PRO CPU.
OSError: [Errno ] ENOENT
MicroPython v1.9.4--g5cd2c7f2e on --; ESP32 module with ESP32
Type "help()" for more information.
>>> 

help一下

Welcome to MicroPython on the ESP32!

For generic online docs please visit http://docs.micropython.org/

For access to the hardware use the 'machine' module:

import machine
pin12 = machine.Pin(, machine.Pin.OUT)
pin12.value()
pin13 = machine.Pin(, machine.Pin.IN, machine.Pin.PULL_UP)
print(pin13.value())
i2c = machine.I2C(scl=machine.Pin(), sda=machine.Pin())
i2c.scan()
i2c.writeto(addr, b'')
i2c.readfrom(addr, )

Basic WiFi configuration:

import network
sta_if = network.WLAN(network.STA_IF); sta_if.active(True)
sta_if.scan()                             # Scan for available access points
sta_if.connect("<AP_name>", "<password>") # Connect to an AP
sta_if.isconnected()                      # Check for successful connection

Control commands:
  CTRL-A        -- on a blank line, enter raw REPL mode
  CTRL-B        -- on a blank line, enter normal REPL mode
  CTRL-C        -- interrupt a running program
  CTRL-D        -- on a blank line, do a soft reset of the board
  CTRL-E        -- on a blank line, enter paste mode

For further help on a specific object, type help(obj)
For a list of available modules, type help('modules')