Sending CEC commands via command line over HDMI
My master plan is to be able to send CEC commands from my raspberry pi to do things such as turn on/off the tv as well as other devices connected to the TV. Then I will be adding voice recognition to send these commands...that's for another day. I have read up on CEC but from what I've gathered it seems like you can't send CEC commands directly through the command line without the CEC usb adapter? I have installed the cec-client and libCEC library on my pi but when I run cec-client -l it shows no devices.
My question is, how can I send CEC commands via the command line to my tv from the pi without the adapter? Am I missing some basic element about CEC?
UPDATE
In addition to the posts below here is a link that asked in the PI portion of stackoverflow which has some more CEC commands that I have put within my .bashrc to turn the tv on/off and change the input
https://raspberrypi.stackexchange.com/questions/5345/raspmbc-send-cec-commands-without-cec-adapter
Answer
You can pipe commands to the cec-client binary
echo "on 0" | cec-client -s # turn on the television
echo "standby 0" | cec-client -s # turn it off (standby)
For completeness, these are some other things that you can do
List connected devices
tv# cec-client -l
libCEC version: 3.1.0, git revision: libcec-3.1.0+5-6d68d21, compiled on Fri 8 Apr 15:44:58 UTC 2016 by nacho@tv on Linux 4.1.19-v7+ (armv7l), features: P8_USB, DRM, P8_detect, randr, RPi
Found devices: 1
device: 1
com port: RPI
vendor id: 2708
product id: 1001
firmware version: 1
type: Raspberry Pi
Check all available CEC commands
tv# echo h | cec-client -s -d 1
opening a connection to the CEC adapter...
================================================================================
Available commands:
[tx] {bytes} transfer bytes over the CEC line.
[txn] {bytes} transfer bytes but don't wait for transmission ACK.
[on] {address} power on the device with the given logical address.
[standby] {address} put the device with the given address in standby mode.
[la] {logical address} change the logical address of the CEC adapter.
[p] {device} {port} change the HDMI port number of the CEC adapter.
[pa] {physical address} change the physical address of the CEC adapter.
[as] make the CEC adapter the active source.
[is] mark the CEC adapter as inactive source.
[osd] {addr} {string} set OSD message on the specified device.
[ver] {addr} get the CEC version of the specified device.
[ven] {addr} get the vendor ID of the specified device.
[lang] {addr} get the menu language of the specified device.
[pow] {addr} get the power status of the specified device.
[name] {addr} get the OSD name of the specified device.
[poll] {addr} poll the specified device.
[lad] lists active devices on the bus
[ad] {addr} checks whether the specified device is active.
[at] {type} checks whether the specified device type is active.
[sp] {addr} makes the specified physical address active.
[spl] {addr} makes the specified logical address active.
[volup] send a volume up command to the amp if present
[voldown] send a volume down command to the amp if present
[mute] send a mute/unmute command to the amp if present
[self] show the list of addresses controlled by libCEC
[scan] scan the CEC bus and display device info
[mon] {1|0} enable or disable CEC bus monitoring.
[log] {1 - 31} change the log level. see cectypes.h for values.
[ping] send a ping command to the CEC adapter.
[bl] to let the adapter enter the bootloader, to upgrade
the flash rom.
[r] reconnect to the CEC adapter.
[h] or [help] show this help.
[q] or [quit] to quit the CEC test client and switch off all
connected CEC devices.
================================================================================
Extracted from
https://ownyourbits.com/2017/02/02/control-your-raspberry-pi-with-your-tv-remote/