无法将 I2C 设备从 Linux 虚拟机连接到 FT232H

Question

我正在尝试连接一个通过 I2C 通信发送和接收数据的传感器。我已将传感器与 FT232H USB 转 I2C 转换器连接，并将其插入 PC。

我得到 dmesg 输出如下 -

[  518.172735] usb 1-3: new full-speed USB device number 4 using xhci_hcd
[  518.306677] usb 1-3: New USB device found, idVendor=0403, idProduct=6001
[  518.306686] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  518.306689] usb 1-3: Product: FT232R USB UART
[  518.306692] usb 1-3: Manufacturer: FTDI
[  518.306695] usb 1-3: SerialNumber: AK04P01W
[  518.309382] ftdi_sio 1-3:1.0: FTDI USB Serial Device converter detected
[  518.309442] usb 1-3: Detected FT232RL
[  518.309445] usb 1-3: Number of endpoints 2
[  518.309448] usb 1-3: Endpoint 1 MaxPacketSize 64
[  518.309450] usb 1-3: Endpoint 2 MaxPacketSize 64
[  518.309453] usb 1-3: Setting MaxPacketSize 64
[  518.309771] usb 1-3: FTDI USB Serial Device converter now attached to ttyUSB0

我得到了 /dev/ttyUSB0 设备。

我有运行下面给出的基于 python 的示例应用程序 link -

https://learn.adafruit.com/adafruit-ft232h-breakout/i2c

我使用的代码片段如下 -

import Adafruit_GPIO.FT232H as FT232H

# Temporarily disable FTDI serial drivers.
FT232H.use_FT232H()

# Find the first FT232H device.
ft232h = FT232H.FT232H()

# Create an I2C device at address 0x70.
i2c = FT232H.I2CDevice(ft232h, 0x70)

但是，它总是卡在下一行 -

ft232h = FT232H.FT232H()

我无法退出功能。

我也遵循了下面给出的步骤 link -

https://unix.stackexchange.com/questions/340789/enabling-i2c-on-debian-i2cdetect-doesnt-show-device

在上面的link中，它显示了一个例子如下 -

所以比如读取版本，需要从寄存器00读取01字节，默认芯片地址为E0，LSB为R/W位，所以改为您使用 E1 作为地址，USB-I2C 适配器所需的命令是 55。因此您通过串行发送的完整序列是 55 E1 00 01，然后您将读取一个字节作为答案。

我不知道如何 select 以下数据的值 -

USB 所需的命令 - I2C 适配器。我们如何得出结论 "Required Command for the adapter"

Answer 1

FT232H vs. FT232R are two different chips. The FT232R does not contain the "MPSSE engine", and therefore cannot be used with 3rd-party code examples nor with the FTDI appnote 255 依赖 MPSSE 实现 i2c 主功能。

无法将 I2C 设备从 Linux 虚拟机连接到 FT232H

Unable to interface I2C device to FT232H from Linux Virtual Machine

python

linux

drivers

serial-port

i2c