Embedded module TQMa57xx - YOCTO Linux BSP documentation


Starterkit Interfaces and Functions

CAN

CAN is typically not enabled in the current BSP. To enable the CAN interfaces use the following commands:
ip link set can0 up type can bitrate 500000
ip link set can1 up type can bitrate 500000

CAN configuration

DIP switches SW3 and SW4 are used to configure the CAN interfaces CAN0 and CAN1.

Function SWx-1 SWx-2
CAN-Bus not terminated OFF OFF
not defined (illegal state) OFF ON
not defined (illegal state) ON OFF
CAN-Bus terminated with 120 Ohm ON ON

CAN Loopback

Loopback Test CAN Interface

CAN0 -> CAN1

candump can0&
cansend can1 5A1#11.2233.44556677.88

CAN1 -> CAN0

candump can1&
cansend can0 5A1#11.2233.44556677.88

Ethernet

The STKa57Xx Starterkit provides two Gigabit and two 10/100 Mbit Ethernet interfaces.

U-Boot

In U-Boot eth0 is configured as default interface. The IP configuration can be done statically or by a DHCP server in the network.

IP configuration via DHCP

For a configuration via a DHCP server, use the dhcp command in U-Boot.

Static IP configuration For a static IP configuration the following, U-Boot environment variables must be set: 

setenv ipaddr <ipaddr> 
(e.g.: setenv ipaddr 192.168.100.111)
setenv netmask <netmask> 
(e.g.: setenv netmask 255.255.255.0)

Linux

All Ethernet interface are activated and configured by systemd-network. The configuration files for the eth0 interface is located in /lib/systemd/network/ these configuration file can be altered to customize the default interface configuration. A documentation of the configuration files can be found here.

eth0 10-eth0.network

For a temporary static configuration the ip command can be used, below some useful ip commands are listed:

Activate a specific interface
e.g. eth0 

ip link set eth0 up


Disable a specific interace
e.g. eth0 

ip link set eth0 down


Show ip address for a specific interface
e.g. eth0 

ip addr show eth0


Show statistic for a specific interface
e.g. eth0 

 
ip -s link show eth0


Set ip address for a specific interface
e.g. eth0 

ip addr add 192.168.1.100/24 dev eth0


Show statistic of all interfaces

ip -s link


Set default gateway for a specific interfaces
e.g. set gateway ip 192.168.1.1 for eth0 

ip route add default via 192.168.1.1 dev eth0

If a DHCP server is available in the network environment the ip configuration can be received from it. To do so execute the udhcpc command, by default eth0 is used.
To configure another interface via dhcp the parameter -i followed by the interface name e.g. eth1 must be given.
e.g. eth1 

udhcpc -i eth1

I2C

An overview of the onboard i2c devices is available here

U-Boot

Select i2c bus device 

i2c dev 0

Show all devices connected to the i2c bus currently selected: 

i2c probe

Linux

Detect all devices connected to a i2c bus: 

i2cdetect 0

RTC

To set the hardware clock to the actual time and date use the following commands: 

date -s [YYYY.]MM.DD-hh:mm[:ss]
hwclock -w

SPI

The MBa57xx has one SPI interfaces. They can be found on the extension headers and can be tested with a loopback test.

SPI Overview

Interface linux filesystem
SPI1 /dev/spidev1.0

Loopback Test SPI Interface

For the loopback test you need a bridge between SPI_MOSI and SPI_MISO:

  • SPI1: bridge between X56_43 (SPI1_D1) and X56_44 (SPI1_D0)
echo -n -e "\x01\x0F" | spi-pipe -d <spi interface> -s 10000000 | hexdump
(e.g. echo -n -e "\x01\x0F" | spi-pipe -d /dev/spidev1.0 -s 10000000 | hexdump)

Temperature Sensors

TEMP_DESCRIPTION

Read TQMa Temperature Sensor 

cat /sys/devices/platform/44000000.ocp/48000000.interconnect/48000000.interconnect:segment@0/48070000.target-module/48070000.i2c/i2c-0/0-001f/hwmon/hwmon0/temp1_input

Read CPU internal Temperature Sensor
The AM57xx CPU has an internal TMU that supports five thermal zones, all can be read by the commands below:

Thermal zone0 

cat /sys/devices/virtual/thermal/thermal_zone0/temp

Thermal zone1 

cat /sys/devices/virtual/thermal/thermal_zone1/temp

Thermal zone2 

cat /sys/devices/virtual/thermal/thermal_zone2/temp

Thermal zone3 

cat /sys/devices/virtual/thermal/thermal_zone3/temp

Thermal zone4 

cat /sys/devices/virtual/thermal/thermal_zone4/temp

USB

With lsusb you can see all connected usb devices. To mount a partition of an usb stick you can excute mount /dev/<partition> <mount dir> (e.g. mount /dev/sdb1 /mnt). This will mount the first partition of sdb to /mnt. To unmount the device execute umount <mount dir> (e.g. umount /mnt).

User LED

The MBa57xx has two user controllable LEDs, the behavior of these LEDs can be selected by several triggers.

User LED Overview

Reference LED name color linux filesystem
V70 out0 green /sys/class/leds/out0
V69 out1 green /sys/class/leds/out1

User LED Location

The user LED's are located in /sys/devices/platform/leds/leds/.
To change the behaviour a specific LED, the value in the file trigger must be overwritten.

The following values are valid:

For example set the trigger of out0 to heartbeat 

echo heartbeat > /sys/class/leds/out0/trigger

  • Last modified: 2022/09/17 13:42