file example

Author: pschatzmann

.DS_Store

@@ -10,15 +10,16 @@ The SD module is connected with the help of the SPI bus
 
 ### Pins:
 
-We use SPI2 (HSPI):
+We connect the SD to the ESP32:
 
-| MCP6022 | ESP32
+| SD      | ESP32
 |---------|---------------
 | VCC     | 5V
 | GND     | GND
-| CS      | CS GP15
-| SCK     | SCK GP14
-| MOSI    | MOSI GP13
-| MISO    | MISO GP12
+| CS      | CS GP5
+| SCK     | SCK GP18
+| MOSI    | MOSI GP23
+| MISO    | MISO GP19
+
 
 

docs/.DS_Store

@@ -5,13 +5,19 @@
 
 BluetoothA2DPSource a2dp_source;
 File sound_file;
-const char* file_name = "audio.raw";
-const int sd_ss_pin = 4;
+const char* file_name = "/audio.raw";
+const int sd_ss_pin = 5;
+const int frame_size_bytes = sizeof(int16_t) * 2;
+
 
 // callback used by A2DP to provide the sound data
 int32_t get_sound_data(Channels* data, int32_t len) {
   // the data in the file must be in int16 with 2 channels 
-  return sound_file.read((uint8_t*)data, len * sizeof(int16_t) * 2 );
+  size_t result_len_bytes = sound_file.read((uint8_t*)data, len * frame_size_bytes );
+  // result is in number of frames
+  int32_t result_len = result_len_bytes / frame_size_bytes;
+  ESP_LOGD("get_sound_data", "%d -> %d",len );
+  return result_len;
 }
 
 // Arduino Setup

examples/file_raw-a2dp/README.md

@@ -10,15 +10,15 @@ The SD module is connected with the help of the SPI bus
 
 ### Pins:
 
-We use SPI2 (HSPI):
+We connect the SD to the ESP32:
 
-| MCP6022 | ESP32
+| SD      | ESP32
 |---------|---------------
 | VCC     | 5V
 | GND     | GND
-| CS      | CS GP15
-| SCK     | SCK GP14
-| MOSI    | MOSI GP13
-| MISO    | MISO GP12
+| CS      | CS GP5
+| SCK     | SCK GP18
+| MOSI    | MOSI GP23
+| MISO    | MISO GP19
 
 

examples/file_raw-a2dp/file_raw-a2dp.ino

@@ -3,8 +3,8 @@
 #include <SD.h>
 
 File sound_file;
-const char* file_name = "audio.raw";
-const int sd_ss_pin = 4;
+const char* file_name = "/audio.raw";
+const int sd_ss_pin = 5;
 const int32_t max_buffer_len = 512;
 int32_t buffer[max_buffer_len][2];
 

examples/file_raw-serial/README.md

@@ -12,19 +12,23 @@ using namespace sound_tools;
 BluetoothA2DPSource a2dp_source;
 I2S<int32_t> i2s;
 ChannelConverter<int32_t> converter(&convertFrom32To16);
-const size_t max_buffer_len = 512;
+FilterFillLeftAndRight<int32_t> bothChannels;
+const size_t max_buffer_len = 1024;
 int32_t buffer[max_buffer_len][2];
 
 // callback used by A2DP to provide the sound data
 int32_t get_sound_data(Channels* data, int32_t len) {
    size_t req_len = min(max_buffer_len,(size_t) len);
 
    // the microphone provides data in int32_t -> we read it into the buffer of int32_t data
-   size_t result = i2s.read(buffer, req_len);
+   size_t result_len = i2s.read(buffer, req_len);
+
+   // we have data only in 1 channel but we want to fill both
+   bothChannels.process(buffer, result_len);
 
    // convert buffer to int16 for A2DP
-   converter.convert(buffer, data, len);
-   return result;
+   converter.convert(buffer, data, result_len);
+   return result_len;
 }
 
 // Arduino Setup