Difference between revisions of "Hammer How to USB FTDI"
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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. | ||
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Revision as of 09:42, 14 May 2011
This page shows how to configure the FTDI serial adapter for use with the hammer.
Contents
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.