From cf3dcfa1fdcf3fb9b3e222eda76c94dd56b9d49c Mon Sep 17 00:00:00 2001
From: MakerM0 <117961102+MakerM0@users.noreply.github.com>
Date: Thu, 5 Dec 2024 15:40:41 +0800
Subject: [PATCH] add pdm mic

---
 main/audio_codecs/no_audio_codec.cc | 53 +++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/main/audio_codecs/no_audio_codec.cc b/main/audio_codecs/no_audio_codec.cc
index a943faee..e4354f3b 100644
--- a/main/audio_codecs/no_audio_codec.cc
+++ b/main/audio_codecs/no_audio_codec.cc
@@ -131,6 +131,59 @@ NoAudioCodec::NoAudioCodec(int input_sample_rate, int output_sample_rate, gpio_n
     ESP_LOGI(TAG, "Simplex channels created");
 }
 
+NoAudioCodec::NoAudioCodec(int input_sample_rate, int output_sample_rate, gpio_num_t spk_bclk, gpio_num_t spk_ws, gpio_num_t spk_dout, gpio_num_t mic_sck, gpio_num_t mic_din) {
+    duplex_ = false;
+    input_sample_rate_ = input_sample_rate;
+    output_sample_rate_ = output_sample_rate;
+
+    // Create a new channel for speaker
+    i2s_chan_config_t tx_chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_1, I2S_ROLE_MASTER);
+    tx_chan_cfg.dma_desc_num = 6;
+    tx_chan_cfg.dma_frame_num = 240;
+    tx_chan_cfg.auto_clear_after_cb = true;
+    tx_chan_cfg.auto_clear_before_cb = false;
+    tx_chan_cfg.intr_priority = 0;
+    ESP_ERROR_CHECK(i2s_new_channel(&tx_chan_cfg, &tx_handle_, NULL));
+
+
+    i2s_std_config_t tx_std_cfg = {
+        .clk_cfg  = I2S_STD_CLK_DEFAULT_CONFIG((uint32_t)output_sample_rate_),
+        .slot_cfg = I2S_STD_MSB_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_32BIT, I2S_SLOT_MODE_MONO),
+        .gpio_cfg = {
+            .mclk = I2S_GPIO_UNUSED,
+            .bclk = spk_bclk,
+            .ws = spk_ws,
+            .dout = spk_dout,
+            .din = I2S_GPIO_UNUSED,
+            .invert_flags = {
+                .mclk_inv = false,
+                .bclk_inv = false,
+                .ws_inv   = false,
+            },
+        },
+    };
+    ESP_ERROR_CHECK(i2s_channel_init_std_mode(tx_handle_, &tx_std_cfg));
+
+    // Create a new channel for MIC in PDM mode
+    i2s_chan_config_t rx_chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_0, I2S_ROLE_MASTER);
+    ESP_ERROR_CHECK(i2s_new_channel(&rx_chan_cfg, NULL, &rx_handle_));
+    i2s_pdm_rx_config_t pdm_rx_cfg = {
+        .clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG((uint32_t)input_sample_rate_),
+        /* The data bit-width of PDM mode is fixed to 16 */
+        .slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
+        .gpio_cfg = {
+            .clk = mic_sck,
+            .din = mic_din,
+ 
+            .invert_flags = {
+                .clk_inv = false,
+            },
+        },
+    };
+    ESP_ERROR_CHECK(i2s_channel_init_pdm_rx_mode(rx_handle_, &pdm_rx_cfg));
+    ESP_LOGI(TAG, "Simplex channels created");
+}
+
 int NoAudioCodec::Write(const int16_t* data, int samples) {
     std::vector<int32_t> buffer(samples);