Difference between revisions of "What can I do with IGEPv2"

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External Audio input devices, such as a powered microphone or the audio output of a PC or MP3 player, can be connected to the via a 3.5mm jack (Audio IN).
 
External Audio input devices, such as a powered microphone or the audio output of a PC or MP3 player, can be connected to the via a 3.5mm jack (Audio IN).
  
You can record audio in with the application Arecord, for example:
+
You can record audio in with the application arecord, for example:
  
 
  $ arecord -t wav -c 2 -r 44100 -f S16_LE -v audio-in.wav
 
  $ arecord -t wav -c 2 -r 44100 -f S16_LE -v audio-in.wav

Revision as of 12:15, 5 September 2012



Overview

This is the 2/3 chapter of IGEPv2 Tutorial Guide.

We will learn some basic tasks.

What can I do

Handle the gpio-LED's

(from How to handle the gpio-LED)

Basic

Log into IGEPv2 (for example via SSH, as shown in the previous chapter), and run the following commands to turn LED's on:

echo 1 > /sys/devices/platform/leds-gpio/leds/d240\:green/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d240\:red/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d440\:green/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d440\:red/brightness

You can turn them down using the same command and write '0' instead of '1'.


Know more

IGEPv2 LED's are controlled with it's platform device at /sys/devices/platform/leds-gpio/leds/

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/devices/platform/leds-gpio/leds/d240\:green/trigger

[none] mmc0 mmc1 timer heartbeat default-on

In the example above, we have checked the status of the trigger in led D240:green. Mode 'none' is selected.

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

echo timer > /sys/devices/platform/leds-gpio/leds/d240\:green/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/devices/platform/leds-gpio/leds/d240\:green/delay_on
echo 750 > /sys/devices/platform/leds-gpio/leds/d240\:green/delay_off

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


How to use RS-485

(from How to use RS485)


This How-To is meant to be a starting point for people to learn to use RS-485 port on IGEP devices as quickly and easily as possible. We use IGEP YOCTO Firmware and RS485 example which describe how to setup and write data on the RS-485 port.


How to use RS-232

(from How to use UARTs)


This How-To is meant to be a starting point for people to learn use UART for IGEP devices as quickly and easily as possible. In this How-To, we use IGEP Firmware and a program that use UART peripherals. This How-To was tested in:

Example program has a debug option using GPIOs to debug via oscilloscope, this method is useful to learn about the Kernel latencies. Debug has set to "write" and "select" functions. More information.


Get sound in (audio in)

External Audio input devices, such as a powered microphone or the audio output of a PC or MP3 player, can be connected to the via a 3.5mm jack (Audio IN).

You can record audio in with the application arecord, for example:

$ arecord -t wav -c 2 -r 44100 -f S16_LE -v audio-in.wav

Following output is expected on console:

Recording WAVE 'audio-in.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0
Its setup is:
stream       : CAPTURE
access       : RW_INTERLEAVED
format       : S16_LE
subformat    : STD
channels     : 2
rate         : 44100
exact rate   : 44100 (44100/1)
msbits       : 16
buffer_size  : 32768
period_size  : 2048
period_time  : 46439
tick_time    : 7812
tstamp_mode  : NONE
period_step  : 1
sleep_min    : 0
avail_min    : 2048
xfer_align   : 2048
start_threshold  : 1
stop_threshold   : 32768
silence_threshold: 0
silence_size : 0
boundary     : 1073741824

When ever you think you want to stop recording just press CTRL+C

Get sound out (audio out)

Connect an external output audio device to the 3.5mm jack Audio Out connector in the board, such as external stereo powered speakers.

The amplifiers for the headset output are disabled by default, so the first thing you'll do is enable these amplifiers with:

amixer set -D hw:0 'Headset' 0dB
amixer set -D hw:0 'HeadsetL Mixer AudioL2' on
amixer set -D hw:0 'HeadsetR Mixer AudioR2' on

Then you can easily play a *.wav sound with the application Aplay, for example:

aplay audio-in.wav




You have successfully completed this chapter of the guide.


Continue this tutorial guide: 3/3 - Start developing under IGEP Technology
Igep forum.png If you have any question, don't ask to ask at the IGEP Community Forum or the IGEP Community Chat Irc.png