53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
#include <furi.h>
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#include "irda_nec.h"
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#include "irda_protocols.h"
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void ir_nec_preambula(void) {
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// 9ms carrier + 4.5ms pause
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irda_pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY);
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delay_us(9000);
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irda_pwm_stop();
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delay_us(4500);
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}
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void ir_nec_send_bit(bool bit) {
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// 0 is 562.5us carrier + 1687.5us pause
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// 1 is 562.5us carrier + 562.5us pause
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irda_pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY);
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delay_us(562.5);
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irda_pwm_stop();
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if(bit) {
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delay_us(562.5);
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} else {
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delay_us(1687.5);
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}
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}
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void ir_nec_send_byte(uint8_t data) {
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for(uint8_t i = 0; i < 8; i++) {
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ir_nec_send_bit((data & (1 << (i))) != 0);
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}
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}
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void ir_nec_send(uint16_t addr, uint8_t data) {
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// nec protocol is:
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// preambula + addr + inverse addr + command + inverse command + bit pulse
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//
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// oddly enough, my analyzer (https://github.com/ukw100/IRMP) displays the reverse command
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// and I don’t know if this is my fault or a feature of the analyzer
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// TODO: check the dictionary and check with a known remote
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uint8_t nec_packet[4] = {~(uint8_t)addr, ~(uint8_t)(addr >> 8), ~(uint8_t)data, data};
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osKernelLock();
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__disable_irq();
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ir_nec_preambula();
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ir_nec_send_byte(nec_packet[0]);
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ir_nec_send_byte(nec_packet[1]);
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ir_nec_send_byte(nec_packet[2]);
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ir_nec_send_byte(nec_packet[3]);
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ir_nec_send_bit(1);
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__enable_irq();
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osKernelUnlock();
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} |