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‎README.md‎

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# README
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树莓派应该算是目前开源硬件里学习嵌入式Linux系统最好的工具，里面的设计思路和一些工具是很值得借鉴的，这里主要使用Raspberry Pi ZERO W进行系统架构分析。
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之前在使用树莓派的过程中有记录一些东西，不过没有进行全面系统性的分析，相对比较零散。
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[博客园 - 随笔分类 - Raspberry Pi](https://www.cnblogs.com/zengjfgit/category/783268.html)
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## ZERO W接口原理图
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![docs/images/RPI_Zero_W_40_Pin.png](docs/images/RPI_Zero_W_40_Pin.png)
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## 参考文档
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* [Raspberry Pi](https://www.raspberrypi.org/)
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* [Raspberry Pi On GitHub](https://github.com/raspberrypi)
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* [Raspberry Pi Documentation](https://github.com/raspberrypi/documentation)
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* [Raspberry Pi Pinout](https://pinout.xyz/pinout/uart)
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* [systemd](https://github.com/systemd/systemd)
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## 笔记文档
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* [0019_Kernel_Build.md](docs/0019_Kernel_Build.md)
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* [0018_Samba.md](docs/0018_Samba.md)
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* [0017_Internationalisation_Options.md](docs/0017_Internationalisation_Options.md)
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* [0016_Setup_Multiple_WiFi_Networks.md](docs/0016_Setup_Multiple_WiFi_Networks.md)
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* [0015_Modify_Default_Route.md](docs/0015_Modify_Default_Route.md)
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* [0014_Ethernet_over_USB-Static_IP.md](docs/0014_Ethernet_over_USB-Static_IP.md)
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* [0013_dtoverlay.md](docs/0013_dtoverlay.md)
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* [0012_Dynamic_Device_Tree.md](docs/0012_Dynamic_Device_Tree.md)
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* [0011_SPI.md](docs/0011_SPI.md)
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* [0010_I2C_AT24C0x.md](docs/0010_I2C_AT24C0x.md)
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* [0009_systemd-sysv-generator.md](docs/0009_systemd-sysv-generator.md)
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* [0008_Systemd_Advance.md](docs/0008_Systemd_Advance.md)
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* [0007_Systemd_Cron_rc-local.md](docs/0007_Systemd_Cron_rc-local.md)
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* [0006_Device_Tree_Overlays.md](docs/0006_Device_Tree_Overlays.md)
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* [0005_raspi-config.md](docs/0005_raspi-config.md)
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* [0004_Pin_Config.md](docs/0004_Pin_Config.md)
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* [0003_BIOS.md](docs/0003_BIOS.md)
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* [0002_Boot_Sequence.md](docs/0002_Boot_Sequence.md)
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* [0001_OTG_To_Ethernet.md](docs/0001_OTG_To_Ethernet.md)
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# README
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树莓派应该算是目前开源硬件里学习嵌入式Linux系统最好的工具，里面的设计思路和一些工具是很值得借鉴的，这里主要使用Raspberry Pi ZERO W进行系统架构分析。
4+
5+
之前在使用树莓派的过程中有记录一些东西，不过没有进行全面系统性的分析，相对比较零散。
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[博客园 - 随笔分类 - Raspberry Pi](https://www.cnblogs.com/zengjfgit/category/783268.html)
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## ZERO W接口原理图
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![docs/images/RPI_Zero_W_40_Pin.png](docs/images/RPI_Zero_W_40_Pin.png)
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## 参考文档
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* [Raspberry Pi](https://www.raspberrypi.org/)
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* [Raspberry Pi On GitHub](https://github.com/raspberrypi)
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* [Raspberry Pi Documentation](https://github.com/raspberrypi/documentation)
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* [Raspberry Pi Pinout](https://pinout.xyz/pinout/uart)
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* [systemd](https://github.com/systemd/systemd)
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## 笔记文档
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* [0020_PWM](https://github.com/ZengjfOS/RPiPWM)
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* [0019_Kernel_Build.md](docs/0019_Kernel_Build.md)
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* [0018_Samba.md](docs/0018_Samba.md)
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* [0017_Internationalisation_Options.md](docs/0017_Internationalisation_Options.md)
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* [0016_Setup_Multiple_WiFi_Networks.md](docs/0016_Setup_Multiple_WiFi_Networks.md)
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* [0015_Modify_Default_Route.md](docs/0015_Modify_Default_Route.md)
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* [0014_Ethernet_over_USB-Static_IP.md](docs/0014_Ethernet_over_USB-Static_IP.md)
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* [0013_dtoverlay.md](docs/0013_dtoverlay.md)
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* [0012_Dynamic_Device_Tree.md](docs/0012_Dynamic_Device_Tree.md)
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* [0011_SPI.md](docs/0011_SPI.md)
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* [0010_I2C_AT24C0x.md](docs/0010_I2C_AT24C0x.md)
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* [0009_systemd-sysv-generator.md](docs/0009_systemd-sysv-generator.md)
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* [0008_Systemd_Advance.md](docs/0008_Systemd_Advance.md)
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* [0007_Systemd_Cron_rc-local.md](docs/0007_Systemd_Cron_rc-local.md)
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* [0006_Device_Tree_Overlays.md](docs/0006_Device_Tree_Overlays.md)
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* [0005_raspi-config.md](docs/0005_raspi-config.md)
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* [0004_Pin_Config.md](docs/0004_Pin_Config.md)
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* [0003_BIOS.md](docs/0003_BIOS.md)
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* [0002_Boot_Sequence.md](docs/0002_Boot_Sequence.md)
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* [0001_OTG_To_Ethernet.md](docs/0001_OTG_To_Ethernet.md)

‎docs/0020_RPiPWM/README.md‎

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# README
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[RPiPWM.py](RPiPWM.py)
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## Ref
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* [Raspberry Pi Pulse Width Modulation (PWM)](https://www.mbtechworks.com/projects/raspberry-pi-pwm.html)

‎docs/0020_RPiPWM/RPiPWM.py‎

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#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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import time
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import RPi.GPIO as GPIO
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GPIOMode = GPIO.BOARD
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GPIOPin = 12
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GPIOType = GPIO.OUT
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GPIOHz = 50
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PulseDut = 50
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PinRef = None
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GPIO.setmode(GPIOMode)
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GPIO.setup(GPIOPin, GPIOType)
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def help():
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print("""
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cmd:
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1. r-run
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2. p-in
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3. f-frequency
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4. d-dut
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""")
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def run():
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global GPIOMode
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global GPIOPin
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global GPIOType
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global GPIOHz
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global PulseDut
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GPIO.setmode(GPIOMode)
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GPIO.setup(GPIOPin, GPIOType)
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PinRef = GPIO.PWM(GPIOPin, GPIOHz)
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PinRef.start(0)
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PinRef.ChangeDutyCycle(PulseDut)
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def PWM():
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global GPIOMode
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global GPIOPin
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global GPIOType
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global GPIOHz
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global PulseDut
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run()
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try:
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while True:
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cmd = input("Enter cmd(r-run, p-in, f-frequency, d-dut: ")
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if cmd != "r":
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PinRef.stop()
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if cmd == "p":
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GPIOPin = input("value: ")
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if cmd == "f":
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GPIOHz = input("value: ")
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if cmd == "d":
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PulseDut = input("value: ")
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if cmd == "r":
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run()
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except KeyboardInterrupt:
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pass
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PinRef.stop()
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GPIO.cleanup()
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if __name__ == '__main__':
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help()
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PWM()

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