audio examples

参考文档（21-30）/example_24_audio_input/example_24_audio_input.ino

@@ -0,0 +1,39 @@
+#include "driver/i2s.h"
+
+const uint16_t BUFFER_SIZE = 512;
+const uint16_t SAMPLE_RATE = 16000;
+i2s_config_t i2s_config = {
+  .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_PDM),
+  .sample_rate = SAMPLE_RATE,
+  .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
+  .channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
+  .communication_format = I2S_COMM_FORMAT_PCM,
+  .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
+  .dma_buf_count = 32,
+  .dma_buf_len = 32
+};
+i2s_pin_config_t pin_config = {
+  .bck_io_num = -1,
+  .ws_io_num = GPIO_NUM_19,
+  .data_out_num = -1,
+  .data_in_num = GPIO_NUM_22
+};
+
+void setup() {
+  Serial.begin(115200);
+  i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
+  i2s_set_pin(I2S_NUM_0, &pin_config);
+}
+
+void loop() {
+  int16_t buf[BUFFER_SIZE];
+  unsigned int read_num;
+
+  i2s_read(I2S_NUM_0, buf, BUFFER_SIZE*2, &read_num, portMAX_DELAY);
+
+  for (int i = 0; i < BUFFER_SIZE; i++) {
+    //buf[i] = (buf[i]-966)*64;
+    Serial.println(buf[i]);
+  }
+}
+