diff --git a/.github/workflows/CI_compile_examples.yml b/.github/workflows/CI_compile_examples.yml
index 6383c113..c0738fb2 100644
--- a/.github/workflows/CI_compile_examples.yml
+++ b/.github/workflows/CI_compile_examples.yml
@@ -119,6 +119,7 @@ jobs:
             - source-url: https://github.com/ambiot/ambd_arduino/raw/dev/Arduino_zip_libraries/AmebaMotors.zip
             - source-url: https://github.com/ambiot/ambd_arduino/raw/dev/Arduino_zip_libraries/AmebaEink.zip
             - name: "SparkFun ADXL313 Arduino Library"
+            - name: "SdFat - Adafruit Fork"
           verbose: false
           enable-deltas-report: false
         if: ${{ github.ref == 'refs/heads/dev' || github.event.pull_request.base.ref == 'dev'}}
@@ -141,6 +142,7 @@ jobs:
             - source-url: https://github.com/ambiot/ambd_arduino/raw/master/Arduino_zip_libraries/AmebaMotors.zip
             - source-url: https://github.com/ambiot/ambd_arduino/raw/master/Arduino_zip_libraries/AmebaEink.zip
             - name: "SparkFun ADXL313 Arduino Library"
+            - name: "SdFat - Adafruit Fork"
           verbose: false
           enable-deltas-report: false
         if: ${{ github.ref == 'refs/heads/master' || github.event.pull_request.base.ref == 'master' }}
diff --git a/Arduino_package/hardware/libraries/SPI/examples/BW16_SD_Card_SPI/BW16_SD_Card_SPI.ino b/Arduino_package/hardware/libraries/SPI/examples/BW16_SD_Card_SPI/BW16_SD_Card_SPI.ino
new file mode 100644
index 00000000..10105d72
--- /dev/null
+++ b/Arduino_package/hardware/libraries/SPI/examples/BW16_SD_Card_SPI/BW16_SD_Card_SPI.ino
@@ -0,0 +1,231 @@
+/*
+  BW16 SPI Bus SD Card example:
+  This program attempts to initialize an SD card and analyze its structure.
+
+  It needs the Adafruit fork of the SdFat Library: https://github.com/adafruit/SdFat/  
+
+  This example code is in the public domain.
+ 
+  This modified example credits to https://github.com/designer2k2 
+ */
+
+#ifdef BOARD_AITHINKER_BW16
+
+#include "SdFat.h"
+#include "sdios.h"
+
+#define SD_CONFIG SdSpiConfig(SS, DEDICATED_SPI, SD_SCK_MHZ(16))
+
+//------------------------------------------------------------------------------
+SdFs sd;
+cid_t cid;
+csd_t csd;
+scr_t scr;
+uint8_t cmd6Data[64];
+uint32_t eraseSize;
+uint32_t ocr;
+static ArduinoOutStream cout(Serial);
+//------------------------------------------------------------------------------
+void cidDmp() {
+  cout << F("\nManufacturer ID: ");
+  cout << uppercase << showbase << hex << int(cid.mid) << dec << endl;
+  cout << F("OEM ID: ") << cid.oid[0] << cid.oid[1] << endl;
+  cout << F("Product: ");
+  for (uint8_t i = 0; i < 5; i++) {
+    cout << cid.pnm[i];
+  }
+  cout << F("\nRevision: ") << cid.prvN() << '.' << cid.prvM() << endl;
+  cout << F("Serial number: ") << hex << cid.psn() << dec << endl;
+  cout << F("Manufacturing date: ");
+  cout << cid.mdtMonth() << '/' << cid.mdtYear() << endl;
+  cout << endl;
+}
+//------------------------------------------------------------------------------
+void clearSerialInput() {
+  uint32_t m = micros();
+  do {
+    if (Serial.read() >= 0) {
+      m = micros();
+    }
+  } while (micros() - m < 10000);
+}
+//------------------------------------------------------------------------------
+void csdDmp() {
+  eraseSize = csd.eraseSize();
+  cout << F("cardSize: ") << 0.000512 * csd.capacity();
+  cout << F(" MB (MB = 1,000,000 bytes)\n");
+
+  cout << F("flashEraseSize: ") << int(eraseSize) << F(" blocks\n");
+  cout << F("eraseSingleBlock: ");
+  if (csd.eraseSingleBlock()) {
+    cout << F("true\n");
+  } else {
+    cout << F("false\n");
+  }
+  cout << F("dataAfterErase: ");
+  if (scr.dataAfterErase()) {
+    cout << F("ones\n");
+  } else {
+    cout << F("zeros\n");
+  }
+}
+//------------------------------------------------------------------------------
+void errorPrint() {
+  if (sd.sdErrorCode()) {
+    cout << F("SD errorCode: ") << hex << showbase;
+    printSdErrorSymbol(&Serial, sd.sdErrorCode());
+    cout << F(" = ") << int(sd.sdErrorCode()) << endl;
+    cout << F("SD errorData = ") << int(sd.sdErrorData()) << dec << endl;
+  }
+}
+//------------------------------------------------------------------------------
+bool mbrDmp() {
+  MbrSector_t mbr;
+  bool valid = true;
+  if (!sd.card()->readSector(0, (uint8_t *)&mbr)) {
+    cout << F("\nread MBR failed.\n");
+    errorPrint();
+    return false;
+  }
+  cout << F("\nSD Partition Table\n");
+  cout << F("part,boot,bgnCHS[3],type,endCHS[3],start,length\n");
+  for (uint8_t ip = 1; ip < 5; ip++) {
+    MbrPart_t *pt = &mbr.part[ip - 1];
+    if ((pt->boot != 0 && pt->boot != 0X80) || getLe32(pt->relativeSectors) > csd.capacity()) {
+      valid = false;
+    }
+    cout << int(ip) << ',' << uppercase << showbase << hex;
+    cout << int(pt->boot) << ',';
+    for (int i = 0; i < 3; i++) {
+      cout << int(pt->beginCHS[i]) << ',';
+    }
+    cout << int(pt->type) << ',';
+    for (int i = 0; i < 3; i++) {
+      cout << int(pt->endCHS[i]) << ',';
+    }
+    cout << dec << getLe32(pt->relativeSectors) << ',';
+    cout << getLe32(pt->totalSectors) << endl;
+  }
+  if (!valid) {
+    cout << F("\nMBR not valid, assuming Super Floppy format.\n");
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+void dmpVol() {
+  cout << F("\nScanning FAT, please wait.\n");
+  int32_t freeClusterCount = sd.freeClusterCount();
+  if (sd.fatType() <= 32) {
+    cout << F("\nVolume is FAT") << int(sd.fatType()) << endl;
+  } else {
+    cout << F("\nVolume is exFAT\n");
+  }
+  cout << F("sectorsPerCluster: ") << sd.sectorsPerCluster() << endl;
+  cout << F("fatStartSector:    ") << sd.fatStartSector() << endl;
+  cout << F("dataStartSector:   ") << sd.dataStartSector() << endl;
+  cout << F("clusterCount:      ") << sd.clusterCount() << endl;
+  cout << F("freeClusterCount:  ");
+  if (freeClusterCount >= 0) {
+    cout << freeClusterCount << endl;
+  } else {
+    cout << F("failed\n");
+    errorPrint();
+  }
+}
+//------------------------------------------------------------------------------
+void printCardType() {
+
+  cout << F("\nCard type: ");
+
+  switch (sd.card()->type()) {
+    case SD_CARD_TYPE_SD1:
+      cout << F("SD1\n");
+      break;
+
+    case SD_CARD_TYPE_SD2:
+      cout << F("SD2\n");
+      break;
+
+    case SD_CARD_TYPE_SDHC:
+      if (csd.capacity() < 70000000) {
+        cout << F("SDHC\n");
+      } else {
+        cout << F("SDXC\n");
+      }
+      break;
+
+    default:
+      cout << F("Unknown\n");
+  }
+}
+//-----------------------------------------------------------------------------
+void setup() {
+  Serial.begin(9600);
+  // Wait for USB Serial
+  while (!Serial) {
+    yield();
+  }
+  cout << F("SdFat version: ") << SD_FAT_VERSION_STR << endl;
+}
+//------------------------------------------------------------------------------
+void loop() {
+  // Read any existing Serial data.
+  clearSerialInput();
+
+  // F stores strings in flash to save RAM
+  cout << F("\ntype any character to start\n");
+  while (!Serial.available()) {
+    yield();
+  }
+  uint32_t t = millis();
+  if (!sd.cardBegin(SD_CONFIG)) {
+    cout << F(
+      "\nSD initialization failed.\n"
+      "Do not reformat the card!\n"
+      "Is the card correctly inserted?\n"
+      "Is there a wiring/soldering problem?\n");
+    if (isSpi(SD_CONFIG)) {
+      cout << F(
+        "Does another SPI device need to be disabled?\n");
+    }
+    errorPrint();
+    return;
+  }
+  t = millis() - t;
+  cout << F("init time: ") << dec << t << " ms" << endl;
+
+  if (!sd.card()->readCID(&cid) || !sd.card()->readCSD(&csd) || !sd.card()->readOCR(&ocr) || !sd.card()->readSCR(&scr)) {
+    cout << F("readInfo failed\n");
+    errorPrint();
+    return;
+  }
+  printCardType();
+  cout << F("sdSpecVer: ") << 0.01 * scr.sdSpecVer() << endl;
+  cout << F("HighSpeedMode: ");
+  if (scr.sdSpecVer() && sd.card()->cardCMD6(0X00FFFFFF, cmd6Data) && (2 & cmd6Data[13])) {
+    cout << F("true\n");
+  } else {
+    cout << F("false\n");
+  }
+  cidDmp();
+  csdDmp();
+  cout << F("\nOCR: ") << uppercase << showbase;
+  cout << hex << ocr << dec << endl;
+  if (!mbrDmp()) {
+    return;
+  }
+  if (!sd.volumeBegin()) {
+    cout << F("\nvolumeBegin failed. Is the card formatted?\n");
+    errorPrint();
+    return;
+  }
+  dmpVol();
+}
+
+#else
+
+void setup() {}
+
+void loop() {}
+
+#endif
diff --git a/Arduino_package/hardware/variants/rtl8720dn_bw16/variant.h b/Arduino_package/hardware/variants/rtl8720dn_bw16/variant.h
index d768309d..1e9be420 100644
--- a/Arduino_package/hardware/variants/rtl8720dn_bw16/variant.h
+++ b/Arduino_package/hardware/variants/rtl8720dn_bw16/variant.h
@@ -101,6 +101,12 @@ extern void wait_for_debug(void);
 #define SPI_SCLK                                AMB_D10 // AMB_D10
 #define SPI_SS                                  AMB_D9  // AMB_D9
 
+/* Arduino style SPI pin mapping */
+static const uint8_t SS = SPI_SS;
+static const uint8_t MOSI = SPI_MOSI;
+static const uint8_t MISO = SPI_MISO;
+static const uint8_t SCK = SPI_SCLK;
+
 /* TwoWire/I2C pin mapping */
 #define I2C_SDA                                 AMB_D8 // AMB_D8
 #define I2C_SCL                                 AMB_D7 // AMB_D7