Raspberry Pi i2c读/写错误 [英] Raspberry Pi i2c Read/Write Error

问题描述

像许多人一样，我有一段时间的Pi，但从未真正做过任何事.我终于可以将MPU6050 IMU连接起来玩了.它使用i2c进行通信，因此我按照Adafruit的指南进行操作，有关此处显示的启用i2c Adafruit i2c .

Like many people, I've had a Pi for a while but never really done anything with it. I've finally got round to hooking up an MPU6050 IMU to play around with. It uses i2c for communication so I followed the guide by Adafruit regarding enabling i2c shown here Adafruit i2c.

然后我将MPU6050连接到i2c总线，并使用i2cdetect -y 1能够在0x68看到设备.

I then hooked up the MPU6050 to the i2c bus, and using i2cdetect -y 1 I was able to see a device at 0x68.

但是，当尝试从设备进行读取或写入时，出现了权限被拒绝的错误，因此我按照这篇文章来解决该问题

However, when trying to read or write from the device I got a permission denied error, so I followed this post to solve that problem /dev/i2c-x permission. It told me to modify /lib/udev/rules.d/60-i2c-tools.rules with

KERNEL=="i2c-0"     , GROUP="i2c", MODE="0660"
KERNEL=="i2c-[1-9]*", GROUP="i2c", MODE="0666"

这可行，但是当实际上尝试使用C ++进行读取或写入时，出现输入/输出错误".同样，在Python中使用smbus会得到[Errno 5] Input/output error 连接到Arduino后，我可以使该设备正常工作.

This worked, but then when actually trying to read or write using C++, I get "Input/output error". Similarly, using smbus in Python I get [Errno 5] Input/output error When connected to an Arduino I can get this device to work perfectly.

我已经用尽了所有可以找到的论坛帖子.希望我刚刚做了一些愚蠢的事情.有人有任何想法吗?

运行Raspbian的原始模型B RPi，如果有帮助的话.

Original model B RPi running Raspbian, if that's of any help.

欢呼

推荐答案

在通常情况下，您实际上不需要更改/lib/udev/rules.d/60-i2c-tools.rules 文件，因此建议您重新安装raspbian.

In normal cases you don't really need to change the /lib/udev/rules.d/60-i2c-tools.rules file, so I would recommend resinstalling raspbian.

将MPU6050连接到正确的引脚:

Connect the MPU6050 to the correct pins:

然后下载官方的Adafruit库:

Then download an official Adafruit library:

• C ++
• Python

• C++
• Python

检查Raspberry Pi的I2C是否已通过$ sudo raspi-config启用，并确保I2C地址正确，除了使用$ i2cdetect -y 1进行检查外，如下所示:

Check if the Raspberry Pi's I2C is enabled with $ sudo raspi-config and make sure the I2C address is correct, besides checking it with $ i2cdetect -y 1, like this:

try:
  bus = Adafruit_I2C(address=0)
  print("Default I2C bus is accessible")
except:
  print("Error accessing default I2C bus")

mcp = None

for i in range(0x00, 0x28):
    try:
        mcp = Adafruit_MCP230XX(address=i, num_gpios=16)
        break
    except:
        pass

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