micropython/Quick Start Guide.md

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MicroPython port for RT-Thread

MicroPython 是一个有效的python实现，适合运行在mcu嵌入式系统之上。

1.体验MicroPython

1.1通过finsh/msh运行micropython

在msh命令行内输入python即可进入MicroPython的交互命令行REPL。

msh />python

MicroPython v1.9.3-6-g1742ab26-dirty on 2017-11-04; RT-Thread Board with stm32f4
>>> 
>>> print('Hello World')
Hello World

现在你就可以在终端上输入和运行python的代码。 如果你想退出python的REPL,可以使用 CTRL + D 快捷键。

1.2在REPL下粘贴程序

micropython有一个特别的粘贴模式。

先在命令行提示符状态下，按下Ctrl-E组合键，就会出现提示：

paste mode; Ctrl-C to cancel, Ctrl-D to finish

然后在粘贴代码，完成后按下Ctlr-D推出粘贴模式。

1.3运行已有的python脚本

msh /sdcard>python rt-thread.py

hello world!

1.4导入外部模块并运行

1.4.1 rtthread module

Use the rtthread module:

>>> import rtthread
>>> 
>>> rtthread.is_preempt_thread()       # determine if code is running in a preemptible thread
True
>>> rtthread.current_tid()             # current thread id
268464956
>>> rtthread.stacks_analyze()          # show thread information
thread     pri  status      sp     stack size max used left tick  error
---------- ---  ------- ---------- ----------  ------  ---------- ---
elog_async  31  suspend 0x000000a8 0x00000400    26%   0x00000003 000
tshell      20  ready   0x00000260 0x00001000    39%   0x00000003 000
tidle       31  ready   0x00000070 0x00000100    51%   0x0000000f 000
SysMonitor  30  suspend 0x000000a4 0x00000200    32%   0x00000005 000
timer        4  suspend 0x00000080 0x00000200    25%   0x00000009 000
>>> 

1.4.2 time module

Use the time module:

>>> import time
>>> 
>>> time.sleep(1)           # sleep for 1 second
>>> time.sleep_ms(500)      # sleep for 500 milliseconds
>>> time.sleep_us(10)       # sleep for 10 microseconds
>>> start = time.ticks_ms() # get value of millisecond counter
>>> delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference

1.4.3 pyb module

Use the pyb module:

>>> import pyb
>>>
>>> pyb.info()              # show information about the board
---------------------------------------------
RT-Thread
---------------------------------------------
total memory: 131048
used memory : 4920
maximum allocated memory: 5836
thread     pri  status      sp     stack size max used left tick  error
---------- ---  ------- ---------- ----------  ------  ---------- ---
elog_async  31  suspend 0x000000a8 0x00000400    26%   0x00000003 000
tshell      20  ready   0x0000019c 0x00001000    39%   0x00000006 000
tidle       31  ready   0x0000006c 0x00000100    50%   0x0000000b 000
SysMonitor  30  suspend 0x000000a8 0x00000200    32%   0x00000005 000
timer        4  suspend 0x0000007c 0x00000200    24%   0x00000009 000
---------------------------------------------
qstr:
  n_pool=0
  n_qstr=0
  n_str_data_bytes=0
  n_total_bytes=0
---------------------------------------------
GC:
  16064 total
  464 : 15600
  1=14 2=6 m=3
>>> pyb.enable_irq()        # enable interrupt
>>> pyb.disable_irq()       # disable interrupt, WARNING: this operation is dangerous
>>> time_start = pyb.millis()          # return the number of milliseconds
>>> pyb.elapsed_millis(time_start)     # calculate the elapsed time of milliseconds
2449
>>> time_start = pyb.micros()          # return the number of microseconds
>>> pyb.elapsed_micros(time_start)     # calculate the elapsed time of microseconds
1769000
>>> pyb.delay(1000)         # delay milliseconds
>>> pyb.udelay(1000*1000)   # delay microseconds
>>> pyb.hard_reset()        # hard reset, like push RESET button

2.MicroPython 库

• MicroPython实现了python函数库每个模块的一部分。
• 为了便于扩展，MicroPython版本的标准python模块都有一个“u”的前缀。
• 因为资源或者一些其他限制，一个特定的MicroPython版本或者移植对比标准python模块可能会缺少一些特性或者功能。
• 也可以使用upip来下载一些软件包。

Builtin functions and exceptions	简介	当前版本是否支持
array	arrays of numeric data	yes
cmath	mathematical functions for complex numbers	yes
gc	control the garbage collector	yes
math	mathematical functions	yes
sys	system specific functions	yes
time	time related functions	yes
ubinascii	binary/ASCII conversions	yes
ucollections	collection and container types	yes
uerrno	system error codes	no
uhashlib	hashing algorithms	yes
uheapq	heap queue algorithm	yes
uio	input/output streams	yes
ujson	JSON encoding and decoding	yes
uos	basic “operating system” services	no
ure	simple regular expressions	yes
uselect	wait for events on a set of streams	no
usocket	socket module	no
ustruct	pack and unpack primitive data types	yes
uzlib	zlib decompression	yes
_thread	multithreading support	no

micropython-specific libraries	简介	当前版本是否支持
btree	simple BTree database	no
framebuf	Frame buffer manipulation	no
machine	functions related to the hardware	yes
micropython	access and control MicroPython internals	yes
network	network configuration	no
uctypes	access binary data in a structured way	yes

Libraries specific to the pyboard	简介	当前版本是否支持
pyb	functions related to the board	yes
Time related functions		yes
Reset related functions		yes
Interrupt related functions		yes
Power related functions		yes
Miscellaneous functions		yes
Classes		no

rt-thread libraries for micropython	简介	当前版本是否支持
rtthread	rt-thread system call	yes

3.资源占用情况

使用gcc工具链编译的情况下，开启micropython，bin文件增大300KB左右。

目前默认给micropython分配的堆大小为8K，可以在menuconfig中对micropython的堆大小进行配置。