M5Stack Nodeモジュールサンプルコード (赤外線送受信)

rmt.ino

// ----------------------------------------------------------
// M5Stack Nodeモジュール向け赤外線送受信 2018/12/24 @ksasao
// ----------------------------------------------------------
// ESP32で赤外線学習リモコンを作る
// https://qiita.com/td2sk/items/4c0ef83bcc7e74e5e8d5#%E9%85%8D%E7%B7%9A
// @td2sk さんのコードをM5Stack動作確認向けに変更

#include <M5Stack.h>
#include "driver/rmt.h"

// 赤外線送信
#define RMT_TX_CHANNEL RMT_CHANNEL_1
#define RMT_TX_GPIO_NUM GPIO_NUM_12

// 赤外線受信
#define RMT_RX_CHANNEL RMT_CHANNEL_0
#define RMT_RX_GPIO_NUM GPIO_NUM_35

#define RMT_CLK_DIV 100
#define RMT_TICK_10_US (2400000000/RMT_CLK_DIV/100000)
#define rmt_item32_TIMEOUT_US 10000

#define MAX_SIGNAL_LEN 1024

size_t received = 0;
rmt_item32_t signals[MAX_SIGNAL_LEN];

void setup() {
  M5.begin();
  M5.Lcd.setBrightness(30);
  M5.Lcd.setTextSize(2);

  init_tx();
  init_rx();
  Serial.println("Initialized...");
  M5.Lcd.println("Button A: Receive IR Signal");
  M5.Lcd.println("Button B: Send IR Signal");
}

void loop() {
  if(M5.BtnA.wasPressed()) {
    M5.Lcd.setCursor(0, 0);
    M5.Lcd.clear();
    rmt_rx_task();
  }
  if(M5.BtnB.wasPressed()) {
    M5.Lcd.setCursor(0, 0);
    M5.Lcd.clear();
    rmt_tx_task();
  }
  M5.update();
}

void init_tx() {
  rmt_config_t rmt_tx;
  rmt_tx.rmt_mode = RMT_MODE_TX;
  rmt_tx.channel = RMT_TX_CHANNEL;
  rmt_tx.gpio_num = RMT_TX_GPIO_NUM;
  rmt_tx.mem_block_num = 4;
  rmt_tx.clk_div = RMT_CLK_DIV;
  rmt_tx.tx_config.loop_en = false;
  rmt_tx.tx_config.carrier_duty_percent = 50;
  rmt_tx.tx_config.carrier_freq_hz = 38000;
  rmt_tx.tx_config.carrier_level = RMT_CARRIER_LEVEL_HIGH;
  rmt_tx.tx_config.carrier_en = 1;
  rmt_tx.tx_config.idle_level = RMT_IDLE_LEVEL_LOW;
  rmt_tx.tx_config.idle_output_en = true;
  rmt_config(&rmt_tx);
  rmt_driver_install(rmt_tx.channel, 0, 0);
}

void init_rx() {
  rmt_config_t rmt_rx;
  rmt_rx.rmt_mode = RMT_MODE_RX;
  rmt_rx.channel = RMT_RX_CHANNEL;
  rmt_rx.clk_div = RMT_CLK_DIV;
  rmt_rx.gpio_num = RMT_RX_GPIO_NUM;
  rmt_rx.mem_block_num = 4;
  rmt_rx.rx_config.filter_en = true;
  rmt_rx.rx_config.filter_ticks_thresh = 100;
  rmt_rx.rx_config.idle_threshold = rmt_item32_TIMEOUT_US / 10 * (RMT_TICK_10_US);
  rmt_config(&rmt_rx);
  rmt_driver_install(rmt_rx.channel, 1000, 0);
}

void rmt_rx_task() {
  RingbufHandle_t rb = NULL;
  rmt_get_ringbuf_handle(RMT_RX_CHANNEL, &rb);
  rmt_rx_start(RMT_RX_CHANNEL, 1);

  size_t rx_size = 0;
  
  status_println("wait ir signal...");
  
  rmt_item32_t *item = (rmt_item32_t*)xRingbufferReceive(rb, &rx_size, 3000);
  rmt_rx_stop(RMT_RX_CHANNEL);
  if(!item) {
    status_println("no data received...");
    return;
  }
  memcpy(signals, item, sizeof(rmt_item32_t) * rx_size);
  
  for (int i = 0; i < rx_size; ++i) {
    signals[i].level0 = ~signals[i].level0;
    signals[i].level1 = ~signals[i].level1;
    if(signals[i].duration1 == 0){
      rx_size = i + 1;
      break;
    }
  }
  
  received = rx_size;
  vRingbufferReturnItem(rb, (void*)item);
  status_print("received items: ");
  status_println(rx_size);

  status_println("recv done");
  rmt_rx_stop(RMT_RX_CHANNEL);

  static char buf[100];
  for(int i=0;i<received;i++){
    sprintf(buf,"%d %d %d %d\r\n", signals[i].duration0,signals[i].level0,signals[i].duration1,signals[i].level1);
    status_print(buf);
  }
}

void rmt_tx_task() {
  status_println("send...");
  rmt_write_items(RMT_TX_CHANNEL, signals, received, 1);
  rmt_wait_tx_done(RMT_TX_CHANNEL, portMAX_DELAY);

  status_println("send done");
}

void status_print(char* str){
  Serial.print(str);
  M5.Lcd.print(str);
}
void status_println(char* str){
  Serial.println(str);
  M5.Lcd.println(str);
}
void status_print(size_t str){
  Serial.print(str);
  M5.Lcd.print(str);
}
void status_println(size_t str){
  Serial.println(str);
  M5.Lcd.println(str);
}