Bidirectional NEC Remote Control Interface built for TM4C123GH6PM
The University of Texas at Arlington | Junior Year | CSE 3442 | Embedded I This Project was programed in C for bare metal operation on the TI Tiva Development Board. This project was developed and created in CCStudio.
This project was designed to interface an NEC remote control with your computer by accepting input signals and transmitting the decoded information via UART to the connected computer. This device is also capable of transmitting saved codes to other nearby devices. The device is able to save 255 total codes in its internal EEPROM for non-volatile storage. This project could be expanded by allowing this device to communicate with a similar board that is connected to the internet and allow for remote non line of sight communication with IR capable devices.
The help command displays all commands available to the end user in a list
that shows what arguments are required and or optional.
List of available commands:
HELP
LIST
DECODE [ON/OFF]
CLEAR
LEARN <NAME> [ADDR] [DATA]
INFO <NAME>
ERASE <NAME>
PLAY <NAME> ...
SEND <ADDR> <DATA>
SENDB <BUTTON>
SENDE
ALERT <GOOD/BAD/ERROR> <ON/OFF>
The list command will list out all saved commands that are stored in the
EEPROM so that you know what can be discovered and be able to properly remove
them if necessary.
This command allows for you to enable or disable to printing or addresses
and data bits when a button is pressed. This will default to off but can be
toggled by just entering DECODE and can be forcefully set with DECODE ON or
DECODE OFF.
The clear command is most helpful if you would like to all saved commands in
the EEPROM. This is so that you can just start fresh.
To be able to learn a new command and save it to the EEPROM you have a few
options. Most simply if you want to learn from another remote you can simply
run the command LEARN <NAME> and then press the button on the remote so that
it can capture the input from the remote itself. Alternatively you can enter
the command LEARN <NAME> [ADDR] [DATA] to directly specify the address and
data values.
At some time you may want to see what is stored for the data at a location
in the EEPROM or find an entry by its name. To do this you can use this
command and enter either the ID or the name you have and the system will be
able to print the address and data values in binary for that entry.
You may need to also remove an item from the EEPROM without effecting other
and to do this would would use the command ERASE the the ID or name following
that. This will replace the location in memory with all 0’s making that name
not able to be found as the string is represented by a NULL.
To play a command for another receiver to read or to send back to itself you
will want to use the play command and specify the name of the item you would
like to send. You can also place multiple names and the device will play
each one consecutively.
This is a debug command that allows for you to send an NEC packet with any
address and data value you would like by sending this command.
This is an additional debug command that allows for you to send the code for
any of the button on the 21 button remote by entering in the number for that
button.
This debug command allows for you to send a signal to another device that
intentionally has an error with the inverted bits being backwards. This is
so that you can ensure that your error checking works.
The ALERT command allows for you to enable and disable any of the 3 alerts
on the system by specifying what one you want to change and telling it what
state you want it to become.