The board used here was a STM32F0Discovery board.
First the application waits for an incoming data byte on the UART interface.
Then a value of 48 is subtracted (data - '0' for convenience) from the data byte and it is sent out using the IR LED.
You can send anything you want, by using the nec_send function from nec.h.
To do this first initialize a handle by calling nec_init with the appropriate parameters and then you are good to go.
Note: If you do not have a TIM16, or it is used otherwise you need to adjust the code in nec.c not to use it.
The controller uses the NEC protocol. If yours looks anything like mine, it's safe to assume it will use NEC too. A nice overview of the protocol can be found here. To be precise the controller uses the "Extended NEC" protocol from the above site.
I found the controller listened for the address 0xEF00. Other sources on the web have different addresses, so either use your remote to capture a signal and read the address from it, or try some out.
The values for the commands can be taken from the table below.
| Code | Action |
|---|---|
| 0x0 | Increase brightness |
| 0x1 | Decrease brightness |
| 0x2 | Off |
| 0x3 | On |
| 0x4 | Red |
| 0x5 | Green |
| 0x6 | Blue |
| 0x7 | White |
| 0x8 | Scarlet |
| 0x9 | Light green |
| 0xA | Periwinkle |
| 0xB | Flash |
| 0xC | Orange |
| 0xD | Mint |
| 0xE | Purple |
| 0xF | Strobe |
| 0x10 | Tangerine |
| 0x11 | Sky |
| 0x12 | Rose |
| 0x13 | Fade |
| 0x14 | Yellow |
| 0x15 | Aqua |
| 0x16 | Pink |
| 0x17 | Smooth |
It may be interesting to note, that the command codes simply enumerate the keys on the remote - first by column, then by row.