Difference between revisions of "Hammer How to USB FTDI"

From eLinux.org
Jump to: navigation, search
(New page for connecting an FT232RL to the hammer)
 
(Change to Category TCT-Hammer)
 
(One intermediate revision by the same user not shown)
Line 42: Line 42:
  
 
If you connect Tx to Rx on the FT232RL module, then you should see what you type.
 
If you connect Tx to Rx on the FT232RL module, then you should see what you type.
 +
 +
[[Category:TCT-Hammer]]

Latest revision as of 16:42, 14 May 2011

This page shows how to configure the FTDI serial adapter for use with the hammer.

Configure the FTDI driver into the kernel

cd linux-2.6.22
make menuconfig
Enable the FTDI Serial Converter Driver
   Device Drivers --->
      USB Support --->
         USB Serial Converter Support --->
   <M> USB FTDI Single Port Serial Driver (EXPERIMENTAL)
Exit, saving your changes
make
make modules_install INSTALL_MOD_PATH=../buildroot/project_build_arm_nofpu/Hammer/root/

This will compile the various kernel modules required and install them in the appropriate location in the root filesystem.

Make sure that /dev/ttyUSB0 gets created

Since the /dev entries are staticlaly defined, we need to ensure that /dev/ttyUSB0 gets created. Edit the buildroot/target/device/Samsung/Hammer/device_table.txt file. Copy the /dev/ttyS line to create a /dev/ttyUSB line. You need to change the name (ttyS to ttyUSB), the major (4 to 188), and the minor (64 to 0).

/dev/ttyS   c   666 0   0   4   64  0   1   4
/dev/ttyUSB c   666 0   0   188  0  0   1   4

Make sure that the ftdi_sio.ko module gets loaded at boot time

Edit the buildroot/project_build_arm_nofpu/Hammer/root/etc/inittab file and add a new entry after the rcS entry:

::sysinit:/etc/init.d/rcS
::sysinit:/sbin/modprobe ftdi_sio

Recreate your rootfs image

cd buildroot
rm binaries/Hammer/rootfs.arm_nofpu.ext2
make

Compile a simple serial test program

Compile sertest.c using the command line:

arm-linux-gcc -lpthreads -o sertest sertest.c

Transfer the sertest program to the hammer (I put it in /mnt/flash). You can use the rx command:

rx /mnt/flash/sertest
chmod +x /mnt/flash/sertest

and send the sertest program using X-Modem with your serial program. You can run sertest using the following command line:

/mnt/flash/sertest -p /dev/ttyUSB0

If you connect Tx to Rx on the FT232RL module, then you should see what you type.