Differences

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--- esp32:i2s [2019/10/11 14:19] – created aistis
+++ esp32:i2s [2020/09/30 07:16] (current) – aistis
@@ Line 1: / Line 1: @@
+MH-ET LIVE Omnidirectional Microphone Module I2S Interface INMP441 MEMS High Precision Low Power Ultra small volume for ESP32
 esp32 i2s microphone
-tik l/r ruti buti high
+tik l/r ruti buti GRND
 {{:esp32:pasted:20191011-141845.png}}
 {{:esp32:pasted:20191011-141830.png}}
+{{:esp32:pasted:20191011-143741.png}}
 https://github.com/maspetsberger/esp32-i2s-mems
+veikia man ir 16 ir 32 bitai: I2S_BITS_PER_SAMPLE_16BIT I2S_BITS_PER_SAMPLE_32BIT
+sample_rate maziausias 4000, didziausias 48000
 ne sitas SPH0645 I2S MEMS Microphone
+SEL is unconnected, i.e. only one channel, apparently left
+    if (bytes_read > 0 and sample != 0) {
+{{:esp32:pasted:20200512-194536.png}}
+<code>
+  // The I2S config as per the example
+  const i2s_config_t i2s_config = {
+    .mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX), // Receive, not transfer
+    //.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN | I2S_MODE_ADC_BUILT_IN),
+    .sample_rate =   SAMPLE_RATE, // 48000,   44100, //                      // 16KHz
+    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // could only get it to work with 32bits
+    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // although the SEL config should be left, it seems to transmit on right
+    //.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
+    //.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,     // Interrupt level 1
+    //      .dma_buf_count = 16,                           // number of buffers
+    //      .dma_buf_len = 80                              // 8 samples per buffer (minimum)
+    .intr_alloc_flags = 0,
+    //.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,     // Interrupt level 1
+    .dma_buf_count = 16,
+    .dma_buf_len = 1024
+  };
+</code>
+ir L/R turi buti pajungtas ant grnd
+{{:esp32:pasted:20200513-210400.png}}