PikaPython

Cross platform ultra lightweight embedded Python engine

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1. Abstract

PikaPython is an ultra-lightweight Python interpreter that runs with only 4KB of RAM, zero dependencies. It is ready to use out of the box without any configuration required and easy to extend with C.

PikaPython also known as PikaScript and PikaPy.

It's very easy to bind C function to python module with the help of Pika Pre-compiler.Only write the API of python in .pyi and the bindings are autoly generated by Pre-compiler.

Get pikapython:

Use Online Project Generator

Generator url: http://pikascript.com

Note: You need the Community Edition license (Now Free) to build Keil projects, and the version of Keil should be newer than v5.36.

PikaPython studio

PikaPython serial terminal, script download and package menage tool.

Quick Start

You can use simulation project to quick start without hardware，or use the out-of-the-box develop board Pika-Pi—Zero.

The board based on STM32G030C8T6 MCU, only 64kB Flash, 8kB RAM can run pikapython with total peripheral device (GPIO、TIME、IIC、RGB、KEY、LCD、RGB). CH340 is deployed to support USB to serial with Type-C USB, support download python script py serial, there are 4 RGB on the board and support the LCD.

Related Projects

• ▶️ pikapython Binding For LVGL

• ⭐ pikapython Bluepill Demo In PlatformIO — Python-like REPL 🐍🔌

• ⭐ pikapython Bluepill Demo In GCC 🐍

• ⏩ pika_startup_demo This program demonstrate the 5 startup methods of pikapython.

• 🎮 PikaPython-OpenHardware PikaPython 开源硬件

• 💻 pikapython-msvc-qt 移植pikapython到windows平台，基于QT，采用MSVC编译器，移植pthread库，支持多线程。

Document

https://pikadoc-en.readthedocs.io/en/latest/index.html

How to contribute

https://pikadoc-en.readthedocs.io/en/latest/%E5%A6%82%E4%BD%95%E5%8F%82%E4%B8%8E%E7%A4%BE%E5%8C%BA%E8%B4%A1%E7%8C%AE.html

Folders

src - core code

bsp - mcu/board support

port - OS and package manager

test - unit test

document - developt document

examples - example scripts

package - packages and moudles

pikaCompiler - pre-compiler write by Rust, used to bind C function to python moudle.

pikaPackageManager - pacakge manager

2.Platform support

MCU support

MCU	bsp	gpio	time	uart	pwm	adc	i2c	dac
stm32g030c8	√	√	√	√	√	√	√
stm32g070cB	√	√	√	√	√	√	√
stm32f103c8	√	√	√	√	√	√	√
stm32f103rb	√	√	√	√	√	√	√
stm32f103ze	√	√	√	√	√	√	√
stm32f103rc	√	√	√	√	√	√	√
stm32f401cc	√	√	√	√	√	√	√
stm32f411ce	√	√	√	√	√	√	√
stm32f407ze	√
stm32f407zg	√
stm32h750vb	√
stm32f051r8	√
air32f103cb	√	√	√
ch582	√	√	√	√		√	√
ch32v103r8t6	√	√	√
cm32m101a	√
w806	√	√	√	√	√	√	√
apm32f030r8	√
apm32e103vb	√
bl-602	√	√			√	√		√
bl-706	√
bl-618	√	√	√	√	√	√	√	√
Raspberry Pico	√
ESP32C3	√	√	√
TC264D	√
devc	√
visual-studio	√
EC600N	√
mm32f5277e9p	√	√
xr806(openharmony)	√

Board support

Board	bsp	gpio	uart	pwm	adc	i2c	rgb	lcd	arm-2d
Pika-Pi-Zero	√	√	√	√	√	√	√	√	√

Board	bsp	pika_lvgl
lvgl-vs-simu	√	√
swm320	√	√

Board	bsp	arm-2d
QEMU-arm2d	√	√

Board	bsp	LED	KEY
SmartLoong	√	√	√

OS support

OS	port	GPIO	TIME	PWM
RT-Thread	√	√	√	√
vsf	√	√

OS	port	Google Test	Benchmark
linux	√	√	√

3.Characteristic

(1)Run environment

Support run in mcu without OS or file system. Can run in everywhere with RAM ≥ 4kB and FLASH ≥ 64kB，such as stm32g030, stm32f103c8t6，esp8266.

(2)Develop enviroment

Support REPL by serial.

Support run and program python scripts by serial.

Support IDEs like Keil, IAR, RT-Thread studio and segger embedded studio to develop C moudle.

Support build tools like CMake, makeFile and Scons.

Zero dependencies, zero configuration, out-of-the-box, easy to integrated into privious C projcet.

Eazy to extern customized C moudles.

Support linux.

(3)Syntax

Support subaggregate of python 3 standard syntax.

Support class and method define, encapsulation-inheritance-polymorphism and moudles in .pyi of C module.

More Details About Syntax Support

Syntax	Compile-Time	Run-Time	Shell
Module Define	√	-	-
Module Import	√	√	√
Class Define	√	√	√
Class Inherit	√	√	√
Method Define	√	√	√
Method Override	√	√	√
Method Invoke	√	√	√
Argument Define	√	√	√
Argument Assignment	√	√	√
Object New	√	√	√
Object Free	√	√	√
Object Nest	√	√	√
Control flow	√	√	√

Operator

+	-	*	/	==	>	<	>=	<=	%	**	//	!=	&	>>	<<	and	or	not	in	+=	-=	*=	/=
√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√	√

Control flow

Syntax	State
if	√
while	√
for in [list]	√
for in range(a, b)	√
for in [dict]	√
if elif else	√
for break/continue	√
while break/continue	√

Module

Syntax	Python Module	C Module
import [module]	√	√
import [module] as	√	-
from [module] import [class/function>]	√	-
from [module] import [class/function>] as	√	-
from [module] import *	-	PikaObj Module Only

List/Dict

Syntax	State
l = list()	√
l = [a, b, c]	√
d = dict()	√
d = {'a':x, 'b':y, 'c':z}	√

Exception

Syntax	State
try:	√
except:	√
except [Exception]:	-
except [Exception] as [err]:	-
except: ... else:	-
raise:	√
raise [Exception]:	-
finally:	-

Slice

Syntax	str	bytes	list
test[i]	√	√	√
test[a : b]	√	√	√
test[a :]	√	√	√

Other keywords/Syntax

yield	is	comprehensions
-	√	-

(4)Develop standard.

Readability first, nearly never use macro function and global argument.

Complete unit testes based on google test.

4.Both talk and show the code：

E-mail: liang6516@outlook.com

5.Demo

The scripts in demos are in the examples folder.

Demo 01 GPIO

View Code

import PikaStdLib
import STM32G0

mem = PikaStdLib.MemChecker()
io1 = STM32G0.GPIO()
time = STM32G0.Time()

io1.setPin('PA8')
io1.setMode('out')
io1.enable()
io1.low()

print('hello pikapython')
print('mem.max :')
mem.max()
print('mem.now :')
mem.now()

while True:
    io1.low()
    time.sleep_ms(500)
    io1.high()
    time.sleep_ms(500)

Demo 02 USART

View Code

import PikaStdLib
import STM32G0

time = STM32G0.Time()
uart = STM32G0.UART()
uart.setId(1)
uart.setBaudRate(115200)
uart.enable()

while True:
    time.sleep_ms(500)
    readBuff = uart.read(2)
    print('read 2 char:')
    print(readBuff)

Demo 03 ADC

View Code

import PikaStdLib
import STM32G0

time = STM32G0.Time()
adc1 = STM32G0.ADC()

adc1.setPin('PA1')
adc1.enable()

while True:
    val = adc1.read()
    print('adc1 value:')
    print(val)
    time.sleep_ms(500)

Demo 04 PWM output

View Code

import PikaStdLib
import STM32G0

time = STM32G0.Time()
pwm = STM32G0.PWM()
pwm.setPin('PA8')
pwm.setFrequency(2000)
pwm.setDuty(0.5)
pwm.enable()

while True:
    time.sleep_ms(500)
    pwm.setDuty(0.5)
    time.sleep_ms(500)
    pwm.setDuty(0.001)
    

Demo 05 RGB

View Code

import STM32G0
import PikaPiZero
import PikaStdLib

rgb = PikaPiZero.RGB()
mem = PikaStdLib.MemChecker()

rgb.init()
rgb.enable()

print('hello 2')
print('mem used max:')
mem.max()

while True:
    print('flowing')
    rgb.flow()

Demo 06 Snake(Need LCD)

View Code

from PikaObj import *
import PikaStdLib
import PikaPiZero
import STM32G0

# hardware init
lcd = PikaPiZero.LCD()
lcd.init()
lcd.clear('white')
key = PikaPiZero.KEY()
key.init()
time = STM32G0.Time()
x_max = 120
y_max = 150

# snake init
s = PikaPiZero.Point()
w = 9
h = 9
s.x = 50
s.y = 10
len = 0
while len < 3:
    b = s
    i = 0
    while i < len:
        b = b.next
        i = i + 1
    b.next = PikaPiZero.Point()
    b.next.x = b.x - 10
    b.next.y = b.y
    b.next.prev = b
    len = len + 1
# ring link
b.next = s
s.prev = b

i = 0
b = s
while i < len:
    lcd.fill(b.x, b.y, w, h, 'blue')
    b = b.next
    i = i + 1

print('snake lengh')
print(len)

# fruit init
f = PikaPiZero.Point()
f.x = 30
f.y = 20
lcd.fill(f.x, f.y, w, h, 'green')

# memory check
mem = PikaStdLib.MemChecker()
print('mem used max:')
mem.max()

# main loop
d = 0
isUpdate = 1
isEat = 0
while True:
    if isUpdate:
        # isUpdate = 0
        # check eat fruit
        if f.x == s.x and f.y == s.y:
            # have eat fruit
            isEat = 1
            f.x = f.x + 30
            if f.x > x_max:
                f.x = f.x - x_max
            f.y = f.y + 30
            if f.y > y_max:
                f.y = f.y - y_max
            lcd.fill(f.x, f.y, w, h, 'green')
        # move snake by the direction
        if d == 0:
            x_new = s.x + 10
            y_new = s.y
            if x_new > x_max:
                x_new = 0
        elif d == 1:
            x_new = s.x
            y_new = s.y - 10
            if y_new < 0:
                y_new = y_max
        elif d == 2:
            x_new = s.x
            y_new = s.y + 10
            if y_new > y_max:
                y_new = 0
        elif d == 3:
            x_new = s.x - 10
            y_new = s.y
            if x_new < 0:
                x_new = x_max
        if isEat:
            isEat = 0
            b_new = PikaPiZero.Point()
            b_new.x = x_new
            b_new.y = y_new
            b_new.prev = s.prev
            b_new.next = s
            s.prev.next = b_new
            s.prev = b_new
            s = b_new
            len = len + 1
            print('snake lengh')
            print(len)
            print('mem used max:')
            mem.max()
        # drow the snake and fruit
        # clear last body
        lcd.fill(s.prev.x, s.prev.y, w, h, 'white')
        # new body
        s.prev.x = x_new
        s.prev.y = y_new
        # head is last body
        s = s.prev
        lcd.fill(s.x, s.y, w, h, 'blue')
        b = s
        i = 0
    # scan key
    key_val = key.get()
    if key_val == 0:
        d = 0
        isUpdate = 1
    elif key_val == 1:
        d = 1
        isUpdate = 1
    elif key_val == 2:
        d = 2
        isUpdate = 1
    elif key_val == 3:
        d = 3
        isUpdate = 1
	

The maximum RAM usage of these demos is only 3.56K, which is 4.56K if the 1K stack is included, and the maximum Flash usage is 30.4K. Refer to the 20K RAM and 64K Flash of STM32F103C8T6, less than 25% RAM and less than 50% Flash are used.

About the custom extern module ？

In addition to device drivers, developing custom Python modules for MCU is very easy. The following two demos are extensions of the custom module, which developed python interfaces for the ARM-2D image driver library.

Boxes~

Rotating suns~

6.Test and develop Core

Test core in docker (recommend)

get start with docker

✨ Contributors

How to contribute

Contribute Log On 2023

Contribute log	Contributer
fix REPL echo for '\b' and 0x7F	versaloon
pika_hal support for ESP32	geekheart
Driver Design for PIKA-OPEN-HARDWARE	Kirin
bsp support for Makefile-win-mingw	unsigned_0
Fix bug for STM32F4 delay_unit()	MrLeekon
bsp support for air780e	Kirin
Component Selection, Schematic Diagram, PCB Design for PIKA-OPEN-HARDWARE	冰点 (WeChat Name)
Driver Design for PIKA-OPEN-HARDWARE	Kirin
Product Design, Component Selection for PIKA-OPEN-HARDWARE	方海钰
Hardware Verification for PIKA-OPEN-HARDWARE	HonestQiao
support PIKA_UNBUFFERD_ENABLE config item	Seny Lee
add this module	blueloveTH
Fix memory leak in event queue	randyscott
Fix a bug of _OP_POW	blueloveTH
fix bsp/esp32/README.md	erzongxie
Fixed a bug where help("modules") crashed when no lib was loaded	梦程MI
support GPIO driver for rt-thread	supperthomas
Fixed a typo	J. Neuschäfer
codecov CI support	Renzhihan
rt-thread build script fix and improve	supperthomas
support pikafs pack and unpack to path	sjy
fix pika_platform_get_tick() in linux port	梦程MI
CH307开发板、BL618开发板	VeriMake
VM instruction extension framework	GorgonMeducer
iotcloud module	梦程MI
implement shell filter	GorgonMeducer
修复socket模块在lwip中fcntl的参数数量错误	梦程MI
support GPIO pika_hal for BLMCU	codercmd
Fix Typo on PikaVM.c	Ikko Eltociear Ashimine
Fix type assert on dataArgs.c	itschina
add examples/Device/KEY_POLL.PY	codercmd
hmac hashlib base64 aes modules	梦程MI
fix pikaCompiler build error on macos	梦程MI

Contribute Log On 2022

Contribute log	Contributer
request module	onceday
mqtt module	FlintJ
Donate：500¥	hardsofttech
Donate：500¥	edmund_wz
Donate：500¥	Meco Jianting Man
Donate：500¥	hardsofttech
PikaNN module	Renzhihan
re module	eglwang
PikaMath.Quaternion()	purewind7
contrubute to PikaCV	purewind7
xr806(openharmony) bsp	sjy
ESP32 package	沧御
MM32F5277E9P package	unsigned
mm32f5277e9p BSP	unsigned
Add CMSIS-PACK	GorgonMeducer
donate: air32f103 board * 20	合宙 xinxi204
contrubute to PikaMath.Math()	onceday
add support for Unix Time	onceday
contrubute to PikaStdLib.String()	purewind7
Add PLOOC support for pikapython Core	GorgonMeducer
Donate：500¥ (ctypes 相关)	蒋太平
fix linux install script	Maximilian Gerhardt
ch582 package	梦程MI
ch582 BSP	梦程MI
Donate：EC600X QuecPython Develop board	移远通信 武加玉
Performance Point: 900->1400	GorgonMeducer
stm32f051r8 BSP	unsigned
stm32f407ze BSP	unsigned
devc BSP	unsigned
TC264D BSP	unsigned
PikaVM improvement	GorgonMeducer
W801Device package	刘延(微信名)
W806 bsp	刘延(微信名)
Donate：ESP32C3 5pic，linker	启明云端 沧御
Donate：LS1C101 mcu 10pic, LS1c101 develop board，debuger	龙芯俱乐部 石南
PikaVSF OS package	versaloon
ESP32C3 BSP	沧御

Contribute Log On 2021

Contribute log	Contributer
Donate：ESP32 board、ink lcd*4	name(微信名)
Donate：smartloong board	龙芯俱乐部 石南
package/STM32F1	sjy
package/STM32F103RBBooter	sjy
bsp/stm32f103rb	sjy
QEMU ARM-2D simulation proejct	liuduanfei
Donate：GD32E103TB2 2 pic	信息牛(微信名)
Rt-thread bsp、port、module	Meco Jianting Man
Donate：EC600S-CN 4G	移远模块
Donate：BL706 board	博流智能 bouffalolab
Donate：CM32M101A 开发板	孟巍(微信名)
Donate：APM32F030R8 board	极海半导体 陈成
Donate：APM32E103VB board	极海半导体 陈成
Donate：APEX-Link	极海半导体 陈成
corde format，add gitattributes	Meco Jianting Man
demo/simulation-keil	千帆(微信名)
demo/stm32f103zet6/demo01-led-stm32f103zet6	甜航
demo/stm32f103zet6/demo02-led-stm32f103zet6_tworoot	甜航
demo/stm32f407zgt/demo01-led-stm32f407vgt	甜航

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