ESP_ERR_NOT_FOUND when esp_intr_alloc

[SvanteKaiser]

I get an error when trying to configure an interrupt for DMA. When I use i2s_read outside the interrupt everything works fine, so it's not a problem with microphones or I2S configuration.

One more question is about dmaIsrHandler. I am not sure that it will work this way. Should i2s_read work inside the interrupt? If not, then is there another way to check sound loudness inside the interrupt?

I2S.cpp:

Code: Select all

#include "infra/I2S.h"
#include "config/config.h"

#define SAMPLE_RATE (16000)
#define PIN_I2S_BCLK (GPIO_NUM_26)
#define PIN_I2S_LRC (GPIO_NUM_25)
#define PIN_I2S_DIN (GPIO_NUM_3)
#define PIN_I2S_DOUT (GPIO_NUM_22)
#define PIN_I2S_MCK (GPIO_NUM_0)

SemaphoreHandle_t dmaInterruptSemaphore;
static intr_handle_t dmaInterruptRetHandle;

extern int loudnessFlag;

void IRAM_ATTR dmaIsrHandler(void* arg) {
  BaseType_t xHigherPriorityTaskWoken = pdFALSE;

  int32_t buffer[128];
  size_t bytes_read;
  i2s_read(I2S_NUM_0, (char*)buffer, sizeof(buffer), &bytes_read, portMAX_DELAY);

  if (*(int*)buffer > NOISE_THRESHOLD || *(int*)buffer < -NOISE_THRESHOLD) {
    loudnessFlag = true;
  }

  xSemaphoreGiveFromISR(dmaInterruptSemaphore, &xHigherPriorityTaskWoken);

  if (xHigherPriorityTaskWoken == pdTRUE) {
    portYIELD_FROM_ISR();
  }
}

I2S::I2S() {
  BITS_PER_SAMPLE = I2S_BITS_PER_SAMPLE_16BIT;// I2S_BITS_PER_SAMPLE_32BIT;
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = BITS_PER_SAMPLE,
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 | ESP_INTR_FLAG_IRAM,
    .dma_buf_count = 16,
    .dma_buf_len = 60,
  };

  i2s_pin_config_t pin_config;

  pin_config.bck_io_num = PIN_I2S_BCLK;
  pin_config.ws_io_num = PIN_I2S_LRC;
  pin_config.data_out_num = I2S_PIN_NO_CHANGE;
  pin_config.data_in_num = PIN_I2S_DIN;
  pin_config.mck_io_num = PIN_I2S_MCK;

  i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM_0, &pin_config);
  i2s_set_clk(I2S_NUM_0, SAMPLE_RATE, BITS_PER_SAMPLE, I2S_CHANNEL_STEREO);

  dmaInterruptSemaphore = xSemaphoreCreateBinary();

  esp_err_t err = esp_intr_alloc(ETS_I2S0_INTR_SOURCE, ESP_INTR_FLAG_LEVEL1 | ESP_INTR_FLAG_IRAM,
    &dmaIsrHandler, NULL, &dmaInterruptRetHandle);
  Serial.print("esp_intr_alloc: ");
  Serial.println(err);

  err = esp_intr_enable(dmaInterruptRetHandle);
  Serial.print("esp_intr_enable: ");
  Serial.println(err);
}

I2S.h:

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#ifndef _I2S_H
#define _I2S_H
#include <Arduino.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2s.h"
#include "esp_system.h"

class I2S {
  i2s_bits_per_sample_t BITS_PER_SAMPLE;
public:
  I2S();
};

#endif // _I2S_H