Mimimum sample rate for I2S.

[bstolk]

I am trying to debug some I2S code I have, and thought I would turn down the sample rate really low.

But the ESP32 does not seem to support low bit-rates?

Because if I set it to 2400Hz, the samples are clocked much faster, then when I set it to 2434 Hz?

What is the lowest sample rate that the ESP32 allows for I2S?

Code: Select all

  #define SAMPLERATE 2400
  const i2s_config_t sendcfg =
  {
    .mode = mastersend,
    .sample_rate = SAMPLERATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_STAND_I2S),
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL2,
    .dma_buf_count = 2,
    .dma_buf_len = 8,
    .use_apll = false,
    .tx_desc_auto_clear = false,
    .fixed_mclk = 0,
  };