ESP-SR compile error

Projects Programming
1

Hello. I'm trying to test ESP-SR on my ESP32, but I get an error while compiling: 'sr_cmd_t' does not name a type. The code was taken from the ESP-SR example. The board I am using is an ESP32.

2

Which exact ESP32 board have you selected in the IDE?

Based on the library files it looks like you need an ESP32S3 based board.

3

Please post your code here, using code tags when you do

4

ESP32 Dev Module

5 
#include "ESP_I2S.h"
#include "ESP_SR.h"

#define I2S_PIN_BCK 17
#define I2S_PIN_WS  47
#define I2S_PIN_DIN 16

#define LIGHT_PIN 40
#define FAN_PIN   41

I2SClass i2s;

// Generated using the following command:
// python3 tools/gen_sr_commands.py "Turn on the light,Switch on the light;Turn off the light,Switch off the light,Go dark;Start fan;Stop fan"
enum {
  SR_CMD_TURN_ON_THE_LIGHT,
  SR_CMD_TURN_OFF_THE_LIGHT,
  SR_CMD_START_FAN,
  SR_CMD_STOP_FAN,
};
static const sr_cmd_t sr_commands[] = {
  {0, "Turn on the light", "TkN nN jc LiT"},
  {0, "Switch on the light", "SWgp nN jc LiT"},
  {1, "Turn off the light", "TkN eF jc LiT"},
  {1, "Switch off the light", "SWgp eF jc LiT"},
  {1, "Go dark", "Gb DnRK"},
  {2, "Start fan", "STnRT FaN"},
  {3, "Stop fan", "STnP FaN"},
};

void onSrEvent(sr_event_t event, int command_id, int phrase_id) {
  switch (event) {
    case SR_EVENT_WAKEWORD: Serial.println("WakeWord Detected!"); break;
    case SR_EVENT_WAKEWORD_CHANNEL:
      Serial.printf("WakeWord Channel %d Verified!\n", command_id);
      ESP_SR.setMode(SR_MODE_COMMAND);  // Switch to Command detection
      break;
    case SR_EVENT_TIMEOUT:
      Serial.println("Timeout Detected!");
      ESP_SR.setMode(SR_MODE_WAKEWORD);  // Switch back to WakeWord detection
      break;
    case SR_EVENT_COMMAND:
      Serial.printf("Command %d Detected! %s\n", command_id, sr_commands[phrase_id].str);
      switch (command_id) {
        case SR_CMD_TURN_ON_THE_LIGHT:  digitalWrite(LIGHT_PIN, HIGH); break;
        case SR_CMD_TURN_OFF_THE_LIGHT: digitalWrite(LIGHT_PIN, LOW); break;
        case SR_CMD_START_FAN:          digitalWrite(FAN_PIN, HIGH); break;
        case SR_CMD_STOP_FAN:           digitalWrite(FAN_PIN, LOW); break;
        default:                        Serial.println("Unknown Command!"); break;
      }
      ESP_SR.setMode(SR_MODE_COMMAND);  // Allow for more commands to be given, before timeout
      // ESP_SR.setMode(SR_MODE_WAKEWORD); // Switch back to WakeWord detection
      break;
    default: Serial.println("Unknown Event!"); break;
  }
}

void setup() {
  Serial.begin(115200);

  pinMode(LIGHT_PIN, OUTPUT);
  digitalWrite(LIGHT_PIN, LOW);
  pinMode(FAN_PIN, OUTPUT);
  digitalWrite(FAN_PIN, LOW);

  i2s.setPins(I2S_PIN_BCK, I2S_PIN_WS, -1, I2S_PIN_DIN);
  i2s.setTimeout(1000);
  i2s.begin(I2S_MODE_STD, 16000, I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO);

  ESP_SR.onEvent(onSrEvent);
  ESP_SR.begin(i2s, sr_commands, sizeof(sr_commands) / sizeof(sr_cmd_t), SR_CHANNELS_STEREO, SR_MODE_WAKEWORD);
}

void loop() {}```
6

I tried the basic example on a variety of ESP32 based boards and it failed in the same fashion as you posted. Next I search for sr_cmd_t and found the below in C:\Users\bugge\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.1.1\libraries\ESP_SR\src\esp32-hal-sr.h (where bugge is my user name)

#if CONFIG_IDF_TARGET_ESP32S3 && (CONFIG_USE_WAKENET || CONFIG_USE_MULTINET)

Note the CONFIG_IDF_TARGET_ESP32S3.

So next I tried to compile for an ESP32S3 based board and that compiles without issues.

7

So, does that mean I can’t use ESP-SR with my ESP32? If so, then what other offline speech recognition library can I use for it?

8

I suspect that that is the case but I'm not an ESP32 user.

I have no idea.

9

I haven't used any Espressif hardware, yet, but I found this. Don't know if it helps at all.

The new library supports the base ESP32 family, the ESP32-S3, and the ESP32-S2 and ESP32-C3 — though while speech recognition is available in Chinese and English on all devices, the library's support for text-to-speech was limited to Chinese at the time of writing.

The new ESP-SR release is now available on GitHub, along with the source code under a permissive variant of the MIT license.

10

Actually I don’t think there are any offline speech recognition software for the regular ESP32 chips.

11

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