ESP32 Forum

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 esp_err_t ret;


        static const int i2s_num = 0; // i2s port number

        static const i2s_config_t i2s_config = {
                .mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN,
                .sample_rate = 8000,
                .bits_per_sample = 8,
                .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
                //.communication_format = I2S_COMM_FORMAT_I2S_MSB,
                .communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_PCM,
                .intr_alloc_flags = 0, // default interrupt priority
                .dma_buf_count = 8,
                .dma_buf_len = 64,
                .use_apll = false
        };

        ret = i2s_driver_install(i2s_num, &i2s_config, 0, NULL);        
        assert(ret == ESP_OK);

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E (6361) I2S: Invalid bits per sample

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bits < I2S_BITS_PER_SAMPLE_16BIT