Difference between revisions of "RPi.GPIO : NanoPi NEO/NEO2/Air GPIO Programming with Python"

Revision as of 13:16, 7 June 2017

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1 Introduction to RPi.GPIO_NP

For users to easily access GPIO with python FriendlyElec integrated RPi.GPIO in the UbuntuCore image for the NanoPi NEO/NEO2.
RPi.GPIO is a famous library in python for Raspberry Pi. FriendlyElec ported it to the NanoPi NEO/NEO2's UbuntuCore and renamed it as RPi.GPIO_NP.
Most RPi.GPIO_NP's APIs are the same as those of RPi.GPIO and you can refer to https://pypi.python.org/pypi/RPi.GPIO for more details.

2 Install RPi.GPIO_NP

The RPi.GPIO_NP library is integrated in all the UbuntuCore images that are and will be released after June 5, 2017. Therefore for images released after this date no installation is needed.

3 Applicable Board Types and Image Files

Here is a table which lists all the board types and image files that work with RPi.GPIO. These image files are under the "official-ROMs" directories of the corresponding download links:

Board Type	Image File	Download Link 1	Download Link 2
NanoPi NEO2	nanopi-neo2_ubuntu-core-xenial_4.11.0_YYYYMMDD.img.zip	baidu	MediaFire
NanoPi NEO	nanopi-neo_ubuntu-core-xenial_4.11.0_YYYYMMDD.img.zip	baidu	MediaFire
NanoPi NEO Air	nanopi-neo-air_ubuntu-core-xenial_4.11.0_YYYYMMDD.img.zip	baidu	MediaFire

4 RPi.GPIO_NP示例

以NanoPi NEO2为例，将一个Matrix - LED通过连接至NanoPi NEO2，像下图这样：

其中，引脚的连接对应如下：

接下来我们用Python实现一个LED闪烁的例子,
在代码中使用数字7来操作Pin7这个引脚，即引脚的编号直接使用物理编号:

4.1 Python语言示例

创建一个Python源文件：

vi led.py

然后键入如下代码:

#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
PIN_NUM = 7
 
GPIO.setmode(GPIO.BOARD)
GPIO.setup(PIN_NUM,GPIO.OUT)
while True:
        GPIO.output(PIN_NUM,True)
        time.sleep(1)
        GPIO.output(PIN_NUM,False)
        time.sleep(1)

运行led.py：

chmod +x led.py
sudo ./led.py

看到LED灯一闪一闪的，就表示成功了。