Hi all,
I'm trying to write an application to send and receive data from a PC
through a FTDI UM245R chip to a hardware board.
When plug the USB-cable with the chip into my PC, dmesg gives me the
following information:
usb 1-2: new full speed USB device using ohci_hcd and address 6
usb 1-2: configuration #1 chosen from 1 choice
ftdi_sio 1-2:1.0: FTDI USB Serial Device converter detected
drivers/usb/serial/ftdi_sio.c: Detected FT232BM
usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0
usb 1-2: usbfs: interface 0 claimed by ftdi_sio while 'brltty' sets
config #1
ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from
ttyUSB0
ftdi_sio 1-2:1.0: device disconnected
I have searched the device description on the internet and found this:
Device is used to communicate with 8-bit MCU. it provides serial
interface to the MCU via USB bus. From the OSes side USB device is seen
as serail port (/dev/ttyUSB0). You need USB support, usb serial
converter support and ftdi serial conv. support.
So I think I should connect to /dev/ttyUSB0, but that 'file' doesn't
exist. When I use USBview, I get the following information:
UM245R
Manufacturer: FTDI
Serial Number: FTCSJNN3
Speed: 12Mb/s (full)
USB Version: 2.00
Device Class: 00(>ifc)
Device Subclass: 00
Device Protocol: 00
Maximum Default Endpoint Size: 8
Number of Configurations: 1
Vendor Id: 0403
Product Id: 6001
Revision Number: 6.00
Config Number: 1
Number of Interfaces: 1
Attributes: a0
MaxPower Needed: 100mA
Interface Number: 0
Name: usbfs
Alternate Number: 0
Class: ff(vend.)
Sub Class: 0
Protocol: 0
Number of Endpoints: 2
Endpoint Address: 81
Direction: in
Attribute: 2
Type: Bulk
Max Packet Size: 64
Interval: 0ms
Endpoint Address: 02
Direction: out
Attribute: 2
Type: Bulk
Max Packet Size: 64
When I plug the device in, I get 3 more devices then when it's not
plugged in:
usbdev1.x_ep00
usbdev1.x_ep02
usbdev1.x_ep81
where x is the same number as the address from dmesg (in this case '6').
So what I think is that this is the device I should communicate with. I
should use the _ep02 to write (USBview says it's OUT) and _ep81 to read
(USBview says it's IN).
But when I use things like:
echo 1234567890 > /dev/usbdev1.6_ep02
echo < /dev/usbdev1.6_ep81
stty -F /dev/usbdev1.6_ep02 sane speed 300 -brkint -imaxbel -echo ixon
stty -F /dev/usbdev1.6_ep81 sane speed 300 -brkint -imaxbel -echo ixon
It always says: "access denied" or "no such file or directory" , even
with sudo.
What should I do to connect with this device? Anybody have an example in
C?
Is it good to use echo or stty in console to do a quick test if I can
read/write?
Thanks
Tim
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