USB to serial adapter
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This type of adapter allows you to add several serial (RS232) ports to your APF board, through the USB Host interface (only available on DevFull & APF27)
Contents
Tested materials
The commercial adapters can be separated in 2 categories, because there are only 2 USB<->serial low cost chipmakers:
- FTDI one
- Prolific one (pl23xx)
| Model | Chip | Driver | Comments |
|---|---|---|---|
| Trendnet TU-S9 | pl2303 | NT | NA |
| working | NT | NA |
Installation
$ make linux-menuconfig Device Drivers ---> [*] USB support ---> <M> USB Serial Converter support Device Drivers ---> [*] USB support ---> <M> USB Serial Converter support ---> <M> USB FTDI Single Port Serial Driver Device Drivers ---> [*] USB support ---> <M> USB Serial Converter support ---> <M> USB Prolific 2303 Single Port Serial Driver $ make
copy following drivers on your target or reflash your rootfs (for more infos, see this page)
drivers/usb/serial/ftdi_sio.ko drivers/usb/serial/pl2303.ko drivers/usb/serial/usbserial.ko
Usage
- be sure that your USB Host is running on your board: explanations are here
- Load the module, for example if you have a Prolific based adapter:
# modprobe pl2303 usbcore: registered new interface driver usbserial usbserial: USB Serial Driver core usbserial: USB Serial support registered for pl2303 pl2303 1-1.1:1.0: pl2303 converter detected usb 1-1.1: pl2303 converter now attached to ttyUSB0 usbcore: registered new interface driver pl2303 pl2303: Prolific PL2303 USB to serial adaptor driver #
- a new serial device will then appear under /dev/ttyUSBN (N starting at 0 and depending on the number of adapters detected).
