Write PWM code for raw IR signal of AC remote

[mj_zen]

Hi,

I have written Hitachi AC IR transmitter using Smart remote 3 library.

Smart remote 3 library support 2 AC protocols, i.e., SIRC and NEC.

Kindly guide me how to write simple PWM code to transmit raw AC IR signal using PWM.

Raw signal could be of any protocol such as NEC, Mitsubishi, SONY etc.

Format of raw signal is as follow:

static uint16_t ir_message[] = { 9000, 4500, 560, 560, 560, 560, 560, 1690, 560, 560, 560, 560, 560, 560, 560, 560, 560, 560, 560,
                                  1690, 560, 1690, 560, 560, 560, 1690, 560, 1690, 560, 1690, 560, 1690, 560, 1690, 560, 560, 560, 560, 560, 560, 560,
                                  1690, 560, 560, 560, 560, 560, 560, 560, 560, 560, 1690, 560, 1690, 560, 1690, 560, 560, 560, 1690, 560, 1690, 560,
                                  1690, 560, 1690, 560 }; // Using exact NEC timing

[Kenneth]

I am not familiar with the syntax here, but typically you can setup a fixed 38kHz PWM on a pin, then use a timer to control the pin configuration (PIN_CNF[]) between for instance between output/disconnect, this should then create any pattern you may wish on the pin.

Kenneth

[mj_zen]

Hi Kenneth,

Thanks for the quick response.

Can you give me some reference code to do the same?

[Kenneth]

You can find an example to setup a PWM here, in addition you will need a timer to control this:
https://devzone.nordicsemi.com/f/nordic-q-a/28081/is-there-a-simple-example-how-to-set-a-pwm-driver/110654#110654 

[mj_zen]

is there any example to control PWM using a timer for reference?