IR transmit example (#180)

* DWT-based microsecond delay * simple ir app (work only with NEC protocol and predefined address - command) * remove space from file name, add delay_us_init_DWT header * float-based delay us * init tim2 by CubeMX * fix simple pwm functions * simple pwm timer based ir nec protocol * ir gui test app Co-authored-by: aanper <mail@s3f.ru>
2020-10-23 12:39:11 +03:00
parent 7205fa7ed7
commit 37fc47a24f
14 changed files with 531 additions and 55 deletions
@@ -0,0 +1,46 @@
+#include "flipper.h"
+#include "irda_nec.h"
+#include "irda_protocols.h"
+
+void ir_nec_preambula(void) {
+    // 9ms carrier + 4.5ms pause
+    pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY, &htim2, TIM_CHANNEL_4);
+    delay_us(9000);
+    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
+    pwm_set(NEC_DUTY_CYCLE, NEC_CARRIER_FREQUENCY, &htim2, TIM_CHANNEL_4);
+    delay_us(562.5);
+    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 don’t 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);
+}