First Commit

libraries/SdFat/examples/UserSPIDriver/UserSPIDriver.ino

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+// An example of an external SPI driver.
+//
+#include "SPI.h"  // Only required if you use features in the SPI library.
+#include "SdFat.h"
+
+#if SPI_DRIVER_SELECT == 3  // Must be set in SdFat/SdFatConfig.h
+
+// SD chip select pin.
+#define SD_CS_PIN SS
+
+// This is a simple driver based on the the standard SPI.h library.
+// You can write a driver entirely independent of SPI.h.
+// It can be optimized for your board or a different SPI port can be used.
+// The driver must be derived from SdSpiBaseClass.
+// See: SdFat/src/SpiDriver/SdSpiBaseClass.h
+class MySpiClass : public SdSpiBaseClass {
+ public:
+  // Activate SPI hardware with correct speed and mode.
+  void activate() { SPI.beginTransaction(m_spiSettings); }
+  // Initialize the SPI bus.
+  void begin(SdSpiConfig config) {
+    (void)config;
+    SPI.begin();
+  }
+  // Deactivate SPI hardware.
+  void deactivate() { SPI.endTransaction(); }
+  // Receive a byte.
+  uint8_t receive() { return SPI.transfer(0XFF); }
+  // Receive multiple bytes.
+  // Replace this function if your board has multiple byte receive.
+  uint8_t receive(uint8_t* buf, size_t count) {
+    for (size_t i = 0; i < count; i++) {
+      buf[i] = SPI.transfer(0XFF);
+    }
+    return 0;
+  }
+  // Send a byte.
+  void send(uint8_t data) { SPI.transfer(data); }
+  // Send multiple bytes.
+  // Replace this function if your board has multiple byte send.
+  void send(const uint8_t* buf, size_t count) {
+    for (size_t i = 0; i < count; i++) {
+      SPI.transfer(buf[i]);
+    }
+  }
+  // Save SPISettings for new max SCK frequency
+  void setSckSpeed(uint32_t maxSck) {
+    m_spiSettings = SPISettings(maxSck, MSBFIRST, SPI_MODE0);
+  }
+
+ private:
+  SPISettings m_spiSettings;
+} mySpi;
+#if ENABLE_DEDICATED_SPI
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, DEDICATED_SPI, SD_SCK_MHZ(50), &mySpi)
+#else  // ENABLE_DEDICATED_SPI
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, SHARED_SPI, SD_SCK_MHZ(50), &mySpi)
+#endif  // ENABLE_DEDICATED_SPI
+SdFat sd;
+
+//------------------------------------------------------------------------------
+void setup() {
+  Serial.begin(9600);
+  if (!sd.begin(SD_CONFIG)) {
+    sd.initErrorHalt(&Serial);
+  }
+  sd.ls(&Serial, LS_SIZE);
+  Serial.println("Done");
+}
+//------------------------------------------------------------------------------
+void loop() {}
+#else  // SPI_DRIVER_SELECT
+#error SPI_DRIVER_SELECT must be three in SdFat/SdFatConfig.h
+#endif  // SPI_DRIVER_SELECT
+