add msc_sdfat example

Author: hathach

.travis.yml

@@ -26,7 +26,7 @@ before_install:
     - source install.sh
 
 install:
-    - arduino --install-library "Adafruit SPIFlash","Adafruit QSPI"
+    - arduino --install-library "Adafruit SPIFlash","Adafruit QSPI","SdFat"
     - pip3 install --user adafruit-nrfutil
 
 script:

examples/MassStorage/msc_sdcard/msc_sdcard.ino

@@ -1,14 +1,14 @@
 // The MIT License (MIT)
 // Copyright (c) 2019 Ha Thach for Adafruit Industries
 
-#include "Adafruit_TinyUSB.h"
+/* This example expose SD card as mass storage using
+ * default SD Library
+ */
+
 #include "SD.h"
+#include "Adafruit_TinyUSB.h"
 
-#ifdef ARDUINO_NRF52832_FEATHER
-const int chipSelect = 11;
-#else
 const int chipSelect = 10;
-#endif
 
 Adafruit_USBD_MSC usb_msc;
 

examples/MassStorage/msc_sdfat/msc_sdfat.ino

@@ -0,0 +1,88 @@
+// The MIT License (MIT)
+// Copyright (c) 2019 Ha Thach for Adafruit Industries
+
+/* This example expose SD card as mass storage using
+ * default SdFat Library
+ */
+
+#include "SPI.h"
+#include "SdFat.h"
+
+#include "Adafruit_TinyUSB.h"
+
+const int chipSelect = 10;
+const int spi_freq_mhz = 50;
+
+Adafruit_USBD_MSC usb_msc;
+
+SdFat sd;
+
+// the setup function runs once when you press reset or power the board
+void setup()
+{
+  // Set disk vendor id, product id and revision with string up to 8, 16, 4 characters respectively
+  usb_msc.setID("Adafruit", "SD Card", "1.0");
+
+  // Set read write callback
+  usb_msc.setReadWriteCallback(msc_read_cb, msc_write_cb, msc_flush_cb);
+
+  // Still initialize MSC but tell usb stack that MSC is not ready to read/write
+  // If we don't initialize, board will be enumerated as CDC only
+  usb_msc.setUnitReady(false);
+  usb_msc.begin();
+
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // wait for native usb
+
+  Serial.println("Adafruit TinyUSB Mass Storage SD Card example");
+
+  Serial.print("\nInitializing SD card ... ");
+  Serial.print(" CS = "); Serial.println(chipSelect);
+
+  if ( !sd.cardBegin(chipSelect, SD_SCK_MHZ(spi_freq_mhz)) )
+  {
+    Serial.println("initialization failed. Things to check:");
+    Serial.println("* is a card inserted?");
+    Serial.println("* is your wiring correct?");
+    Serial.println("* did you change the chipSelect pin to match your shield or module?");
+    while (1) delay(1);
+  }
+
+  // Size in blocks (512 bytes)
+  uint32_t block_count = sd.card()->cardSize();
+
+  Serial.print("Volume size (MB):  ");
+  Serial.println((block_count/2) / 1024);
+
+  // Set disk size, SD block size is always 512
+  usb_msc.setCapacity(block_count, 512);
+
+  // MSC is ready for read/write
+  usb_msc.setUnitReady(true);
+}
+
+void loop()
+{
+  // nothing to do
+}
+
+int32_t msc_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
+{
+  (void) bufsize;
+  return sd.card()->readBlocks(lba, (uint8_t*) buffer, bufsize/512) ? bufsize : -1;
+}
+
+// Callback invoked when received WRITE10 command.
+// Process data in buffer to disk's storage and 
+// return number of written bytes (must be multiple of block size)
+int32_t msc_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
+{
+  return sd.card()->writeBlocks(lba, buffer, bufsize/512) ? bufsize : -1;
+}
+
+// Callback invoked when WRITE10 command is completed (status received and accepted by host).
+// used to flush any pending cache.
+void msc_flush_cb (void)
+{
+  sd.card()->syncBlocks();
+}