flipperzero-firmware/applications/irda/irda_nec.c

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#include "flipper.h"
#include "irda_nec.h"
#include "irda_protocols.h"
void ir_nec_preambula(void) {
// 9ms carrier + 4.5ms pause
hal_pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY, &htim2, TIM_CHANNEL_4);
delay_us(9000);
hal_pwm_stop(&htim2, TIM_CHANNEL_4);
delay_us(4500);
}
void ir_nec_send_bit(bool bit) {
// 0 is 562.5us carrier + 1687.5us pause
// 1 is 562.5us carrier + 562.5us pause
hal_pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY, &htim2, TIM_CHANNEL_4);
delay_us(562.5);
hal_pwm_stop(&htim2, TIM_CHANNEL_4);
if(bit) {
delay_us(562.5);
} else {
delay_us(1687.5);
}
}
void ir_nec_send_byte(uint8_t data) {
for(uint8_t i = 0; i < 8; i++) {
ir_nec_send_bit((data & (1 << (i))) != 0);
}
}
void ir_nec_send(uint8_t addr, uint8_t data) {
// nec protocol is:
// preambula + addr + inverse addr + command + inverse command + bit pulse
//
// oddly enough, my analyzer (https://github.com/ukw100/IRMP) displays the reverse command
// and I dont know if this is my fault or a feature of the analyzer
// TODO: check the dictionary and check with a known remote
uint8_t nec_packet[4] = {addr, ~(uint8_t)addr, ~(uint8_t)data, data};
ir_nec_preambula();
ir_nec_send_byte(nec_packet[0]);
ir_nec_send_byte(nec_packet[1]);
ir_nec_send_byte(nec_packet[2]);
ir_nec_send_byte(nec_packet[3]);
ir_nec_send_bit(1);
}