FTDI通用转USB芯片简述

FTDI通⽤转USB芯⽚简述

FTDI公司的FT2232系列芯⽚可实现USB与异步串⾏⼝RS232/RS485、同步串⾏总线IIC/SPI/JTAG相互通信，市场占有率，使⽤普遍。FTDI芯⽚有两种类型的驱动：virtual COM port driver (VCP)和D2xx。VCP就是常⽤的U转串COM驱动，实现USB到虚拟串⼝功能，应⽤于异步RS232/RS485与USB间通信，linux设备⽂件为/dev/ttyUSBx；D2XX应⽤于同步串⾏总线IIC/SPI/JTAG与USB间通信，整个驱动框架都有FTDI公司提供。

COM驱动

linux⽀持FTDI公司的VCP驱动需配置内核：

Device Drivers --->

[*] USB support --->

<M> USB Serial Converter support --->

<M> USB Prolific 2303 Single Port Serial Driver

<M> USB FTDI Single Port Serial Driver

Prolific和FTDI是常⽤的USB转串⼝芯⽚⼚商。通⽤模块usbserial.ko，prolific公司的模块pl2303.ko，ftdi公司的模块ftdi_sio.ko

[ 1.771996] usbcore: registered new interface driver usbfs

[ 1.777600] usbcore: registered new interface driver hub

[ 1.782975] usbcore: registered new device driver usb

[ 3.227325] usbcore: registered new interface driver usb-storage

[ 3.331190] usbcore: registered new interface driver bcm203x

[ 3.336872] usbcore: registered new interface driver bfusb

[ 3.342381] usbcore: registered new interface driver btusb

[ 3.347893] usbcore: registered new interface driver ath3k

[ 3.496381] usbcore: registered new interface driver usbhid

擀筋棒

[ 3.501958] usbhid: USB HID core driver

[ 58.132670] usb 1-1: new full-speed USB device number 2using xhci-hcd

[ 58.314580] usbcore: registered new interface driver usbserial

压花模具

[ 58.316675] usbcore: registered new interface driver pl2303

[ 58.316707] usbserial: USB Serial support registered for pl2303

[ 58.317386] usb 1-1: pl2303 converter now attached to ttyUSB0

[ 289.400405] usb 1-1: USB disconnect, device number 2

或

[ 1.774779] usbcore: registered new interface driver usbfs

汽车空调电磁离合器

[ 1.780377] usbcore: registered new interface driver hub

[ 1.785752] usbcore: registered new device driver usb

[ 3.230535] usbcore: registered new interface driver usb-storage

[ 3.334244] usbcore: registered new interface driver bcm203x

[ 3.339930] usbcore: registered new interface driver bfusb

[ 3.345439] usbcore: registered new interface driver btusb

[ 3.350951] usbcore: registered new interface driver ath3k

木材烘干

[ 3.495753] usbcore: registered new interface driver usbhid

[ 3.501362] usbhid: USB HID core driver

[ 3.643788] usb 1-1: new high-speed USB device number 2using xhci-hcd

[ 7.070296] usbcore: registered new interface driver usbserial

信号转换器[ 7.099899] usbcore: registered new interface driver ftdi_sio

[ 7.099925] usbserial: USB Serial support registered for FTDI USB Serial Device

[ 7.100046] usb 1-1: Detected FT2232H

[ 7.100439] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0

[ 7.100539] usb 1-1: Detected FT2232H

[ 7.100667] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB1

[ 86.423288] usb 1-1: USB disconnect, device number 2

插⼊USB设备会在/dev/ttyUSBx⽂件出现，可像操作普通的串⼝⽂件/dev/ttySx⼀样操作，采⽤通⽤termios编程。

D2XX驱动

在linux中VCP和D2XX驱动是不兼容的，当D2XX驱动应⽤前应卸载VCP驱动模块：

sudo rmmod ftdi_sio

sudo rmmod usbserial

实际测试中采⽤D2XX驱动时系统会⾃动卸载VCP驱动。

apt install libftdi-dev

在D2XX驱动之上是libmpsse，即MPSSE库。Multi Protocol Synchronous Serial Engine(MPSSE)是⼀个通⽤的同步总线如I2C、SPI或JTAG通信库，⽤于FT2232D、FT2232H、FT4232H和FT232H芯⽚通过USB与PC或ARM通信。MPSSE基于D2XX设计。

D2XX应⽤

参考：

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h5n95．

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