Revision as of 10:00, 20 May 2016

IGEP SMARC iMX6 Tutorial Guides

1/3 - Getting started with IGEP SMARC iMX6 2/3 - What can I do with IGEP SMARC iMX6 3/3 - Start developing with IGEP SMARC iMX6 IGEP SMARC iMX6 Product Page IGEP SMARC iMX6 Hardware manual

Overview

This is the 2/3 chapter of the Getting Started with IGEP SMARC iMX6 Tutorial Guide.

In this second chapter, we will learn some basics tasks. Upon completion, you will be ready to continue with chapter 3/3 that explains more advanced tasks.

What can I do

You must logged in the board.

Handle the GPIO-LEDS

The board has two user bicolor (green/red) leds available that can be controlled. In its simplest form, you can control of LEDs from userspace. LEDs appear in /sys/class/leds/igep and you can turn on and off with following commands:

$ echo 1 > /sys/class/leds/igep\:red\:led1/brightness
$ echo 1 > /sys/class/leds/igep\:red\:led0/brightness
$ echo 0 > /sys/class/leds/igep\:red\:led1/brightness
$ echo 0 > /sys/class/leds/igep\:red\:led0/brightness

$ echo 1 > /sys/class/leds/igep\:green\:led1/brightness
$ echo 1 > /sys/class/leds/igep\:green\:led0/brightness
$ echo 0 > /sys/class/leds/igep\:green\:led1/brightness
$ echo 0 > /sys/class/leds/igep\:green\:led0/brightness

If you want to trigger the leds you can enable this mode and select the trigger source (none by default) to: mmc0, mmc1, timer, heartbeat and default-on.

To enable any of this modes you just have to change a parameter in the directory of the led you want to control. You can see all the possibilities using the instruction 'cat':

$   cat /sys/class/leds/igep\:red\:led0/trigger

[none] mmc0 mmc1 timer heartbeat default-on

In the example above, we have checked the status of the trigger in led red\led0. Mode 'none' is selected.

To change it, for example, to the timer mode you can use 'echo':

echo timer > /sys/class/leds/igep\:red\:led0/trigger

In this case, we have set the trigger to the 'timer' mode. Now you can set the time for what the led is ON and the time it is OFF using:

echo 250 > /sys/class/leds/igep\:red\:led0/delay_on
echo 750 > /sys/class/leds/igep\:red\:led0/delay_off

Now the selected led is configured with a timer consisting of 250 miliseconds ON and 750 miliseconds OFF.

The base has two user (red/blue) leds available that can be controlled. Can't use them in the same time. In its simplest form, you can control of LEDs from userspace. LEDs appear in /sys/class/leds/base and you can turn on and off with following commands:

$ echo 1 > /sys/class/leds/base\:blue\:led0/brightness
$ echo 1 > /sys/class/leds/base\:red\:led0/brightness
$ echo 0 > /sys/class/leds/base\:blue\:led0/brightness
$ echo 0 > /sys/class/leds/base\:red\:led0/brightness

How to use UART (RS485)

under construction

CAN BUS

under construction

Audio

under construction

Boot SATA

under construction

Boot emmc

under construction

Install firmware emmc

under construction

How to use EEPROM

EEPROM can be read and write via /sys/devices/soc0/soc.0/2100000.aips-bus/21a8000.i2c/i2c-2/2-0050/eeprom:

• Write EEPROM:

echo "data" > /sys/devices/soc0/soc.0/2100000.aips-bus/21a8000.i2c/i2c-2/2-0050/eeprom 

• Read EEPROM:

cat /sys/devices/soc0/soc.0/2100000.aips-bus/21a8000.i2c/i2c-2/2-0050/eeprom

SPINOR

under construction

IO expansion

under construction

wifi

under construction

HDMI resolution

under construction

modem USB

under construction

You have successfully completed this chapter of the guide.

If you have any question, don't ask to ask at the IGEP Community Forum or the IGEP Community Chat