WiringPi ODROID C2 Python 读取模拟输入

Question

ODROID C2是一款类似于Raspberry PI的开发板。我已经按照网站为我的开发板指定的方式安装和配置了 WiringPi。运行 gpio readall returns table:

 +------+-----+----------+------+ Model  ODROID-C2 +------+----------+-----+------+
 | GPIO | wPi |   Name   | Mode | V | Physical | V | Mode |   Name   | wPi | GPIO |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
 |      |     |     3.3v |      |   |  1 || 2  |   |      | 5v       |     |      |
 |      |   8 |    SDA.1 |      |   |  3 || 4  |   |      | 5V       |     |      |
 |      |   9 |    SCL.1 |      |   |  5 || 6  |   |      | 0v       |     |      |
 |  249 |   7 | GPIO.249 |   IN | 1 |  7 || 8  |   |      | TxD1     | 15  |      |
 |      |     |       0v |      |   |  9 || 10 |   |      | RxD1     | 16  |      |
 |  247 |   0 | GPIO.247 |   IN | 1 | 11 || 12 | 1 | IN   | GPIO.238 | 1   |  238 |
 |  239 |   2 | GPIO.239 |   IN | 1 | 13 || 14 |   |      | 0v       |     |      |
 |  237 |   3 | GPIO.237 |   IN | 1 | 15 || 16 | 1 | IN   | GPIO.236 | 4   |  236 |
 |      |     |     3.3v |      |   | 17 || 18 | 1 | IN   | GPIO.233 | 5   |  233 |
 |  235 |  12 | GPIO.235 |   IN | 1 | 19 || 20 |   |      | 0v       |     |      |
 |  232 |  13 | GPIO.232 |   IN | 1 | 21 || 22 | 1 | IN   | GPIO.231 | 6   |  231 |
 |  230 |  14 | GPIO.230 |   IN | 1 | 23 || 24 | 1 | IN   | GPIO.229 | 10  |  229 |
 |      |     |       0v |      |   | 25 || 26 | 1 | OUT  | GPIO.225 | 11  |  225 |
 |      |  30 |    SDA.2 |      |   | 27 || 28 |   |      | SCL.2    | 31  |      |
 |  228 |  21 | GPIO.228 |   IN | 1 | 29 || 30 |   |      | 0v       |     |      |
 |  219 |  22 | GPIO.219 |   IN | 1 | 31 || 32 | 1 | IN   | GPIO.224 | 26  |  224 |
 |  234 |  23 | GPIO.234 |   IN | 0 | 33 || 34 |   |      | 0v       |     |      |
 |  214 |  24 | GPIO.214 |   IN | 1 | 35 || 36 | 1 | IN   | GPIO.218 | 27  |  218 |
 |      |  25 |    AIN.1 |      |   | 37 || 38 |   |      | 1v8      | 28  |      |
 |      |     |       0v |      |   | 39 || 40 |   |      | AIN.0    | 29  |      |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+

我正在尝试从接线 pi 列（左下数第二个）的模拟引脚 #25 读取输入。

脚本代码如下：

#!/usr/bin/python
import wiringpi2 as wpi
import time

wpi.wiringPiSetup()

while True:
    print(wpi.analogRead(25))

#use pin 25 for analogue input

为什么只返回 0？我的 phone 通过辅助接头连接到模拟引脚。左右音频线拼接在一起并连接到 wiringpi pin #25。

我已确认 wiringpi 正在运行。我能够控制 LED。用示波器确认电路工作正常。

感谢您的帮助。

Answer 1

ODROID 论坛上的一个回答详细说明了引脚似乎是按引脚类型寻址的。由于 ODROID C2 只有两个模拟输入引脚，因此它们分别被指定为引脚 #0 和 #1。将引脚号更改为 #1 解决了问题（后来我将模拟输入引脚移到了接头的另一侧）。

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WiringPi ODROID C2 Python 读取模拟输入

WiringPi ODROID C2 Python reading analogue input

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