Add SDBlockDevice example

SDBlockDevice/README.md

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+# SDBlockDevice example
+
+SDBlockDevice usage example for Mbed OS
+

SDBlockDevice/main.cpp

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+#include "mbed.h"
+#include "SDBlockDevice.h"
+
+// Instantiate the SDBlockDevice by specifying the SPI pins connected to the SDCard
+// socket. The PINS are:
+//     MOSI (Master Out Slave In)
+//     MISO (Master In Slave Out)
+//     SCLK (Serial Clock)
+//     CS (Chip Select)
+SDBlockDevice sd(MBED_CONF_SD_SPI_MOSI, MBED_CONF_SD_SPI_MISO, MBED_CONF_SD_SPI_CLK, MBED_CONF_SD_SPI_CS);
+uint8_t block[512] = "Hello World!\n";
+
+int main()
+{
+    // Call the SDBlockDevice instance initialisation method
+    if ( 0 != sd.init()) {
+        printf("Init failed \n");
+        return -1;
+    }
+    printf("sd size: %llu\n",         sd.size());
+    printf("sd read size: %llu\n",    sd.get_read_size());
+    printf("sd program size: %llu\n", sd.get_program_size());
+    printf("sd erase size: %llu\n",   sd.get_erase_size());
+
+    // Set the frequency
+    if ( 0 != sd.frequency(5000000)) {
+        printf("Error setting frequency \n");
+    }
+
+    if ( 0 != sd.erase(0, sd.get_erase_size())) {
+        printf("Error Erasing block \n");
+    }
+
+    // Write data block to the device
+    if ( 0 == sd.program(block, 0, 512)) {
+        // Read the data block from the device
+        if ( 0 == sd.read(block, 0, 512)) {
+            // Print the contents of the block
+            printf("%s", block);
+        }
+    }
+
+    // Call the SDBlockDevice instance de-initialisation method
+    sd.deinit();
+}

SDBlockDevice/mbed-os.lib

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+https://github.com/ARMmbed/mbed-os/#c966348d3f9ca80843be7cdc9b748f06ea73ced0