Beaglebone

Accessing console

From [1]

Windows

Install drivers 32bit or 64bit

Linux

Quick start

 sudo modprobe ftdi_sio vendor=0x0403 product=0xa6d0

Proper Fix

Add the following to "/etc/udev/rules.d/73-beaglebone.rules"

ACTION=="add", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_interface", \
       ATTRS{idVendor}=="0403", ATTRS{idProduct}=="a6d0", \
       DRIVER=="", RUN+="/sbin/modprobe -b ftdi_sio"
ACTION=="add", SUBSYSTEM=="drivers", \
       ENV{DEVPATH}=="/bus/usb-serial/drivers/ftdi_sio", \
       ATTR{new_id}="0403 a6d0"
ACTION=="add", KERNEL=="ttyUSB*",  ATTRS{interface}=="BeagleBone", \
       ATTRS{bInterfaceNumber}=="00",  SYMLINK+="beaglebone-jtag"
ACTION=="add", KERNEL=="ttyUSB*",  ATTRS{interface}=="BeagleBone", \
       ATTRS{bInterfaceNumber}=="01",  SYMLINK+="beaglebone-serial"

Then run

sudo udevadm control --reload-rules

Serial Ports

These are not available in the default mux settings.

Mux settings can be changed by writing to

/sys/kernel/debug/omap_mux/

Then the file name is the MODE0 usage of the pin - see the SRM for details.

ttyO0

USB Console

ttyO1

echo 0 > /sys/kernel/debug/omap_mux/uart1_txd
echo 20 > /sys/kernel/debug/omap_mux/uart1_rxd

ttyO2

echo 1 > /sys/kernel/debug/omap_mux/spi0_d0
echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk

ttyO3

 echo 1 >  /sys/kernel/debug/omap_mux/ecap0_in_pwm0_out

Not available for expansion boards.

ttyO4

echo 06 > /sys/kernel/debug/omap_mux/gpmc_wpn
echo 26 > /sys/kernel/debug/omap_mux/gpmc_wait0

ttyO5

echo 4 >  /sys/kernel/debug/omap_mux/lcd_data8
echo 24 >  /sys/kernel/debug/omap_mux/lcd_data9

I2C

echo "2" > /sys/kernel/debug/omap_mux/i2c0_scl
echo "2" > /sys/kernel/debug/omap_mux/i2c0_sda

Makes the i2c bus appear on P9-19 and P9-20. It automatically does this in the latest kernel version.

This is i2c-3 in software

i2cdetect -r -y 3

Lists devices on the i2c bus.

UU means in use -- Nothing detected xx Address of device

RTC

echo ds3232 0x68 >/sys/bus/i2c/devices/i2c-3/new_device

Tells the kernel about the RTC it can then be configured using hwclock

hwclock -f /dev/rtc1 --set --date="9/22/96 16:45:05"

Needs to be used for the initial setting - after that the following commands can be used

 hwclock -f /dev/rtc1 -r

Reads the current time from the hwclock

 hwclock -f /dev/rtc1 -s

Sets the current system time from the hwclock

 hwclock -f /dev/rtc1 -w

writes the system time to the hwclock.

GPIO

GPIO number = 32*First # + Second # 

http://akademii.blogspot.co.uk/2012/02/beaglebone-gpio-testing.html

Have to change mux settings so gpio is output

Export the GPIO e.g.

echo "34" > /sys/class/gpio/export

Turn on/off

echo "high" > /sys/class/gpio/gpio34/direction
echo "low" > /sys/class/gpio/gpio34/direction

GPIO 1_0

echo "7" > /sys/kernel/debug/omap_mux/gpmc_ad0

GPIO 1_1

echo "7" > /sys/kernel/debug/omap_mux/gpmc_ad1

GPIO 1_2

echo "7" > /sys/kernel/debug/omap_mux/gpmc_ad2

GPIO 1_3

echo "7" > /sys/kernel/debug/omap_mux/gpmc_ad3

THIS ONE APPEARS TO BE BROKEN AT THE MOMENT

required software install

sudo apt-get install vim ctags subversion ppp build-essential wget python ipython pylint pep8 pychecker python-serial automake