Add FlashIAPBlockDevice example

Author: juhaylinen

FlashIAPBlockDevice/README.md

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+# FlashIAPBlockDevice example
+
+FlashIAPBlockDevice usage example for Mbed OS
+

FlashIAPBlockDevice/main.cpp

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+#include "mbed.h"
+#include "FlashIAPBlockDevice.h"
+
+// Create flash IAP block device
+FlashIAPBlockDevice bd;
+
+int main() {
+    printf("FlashIAPBlockDevice test\n");
+
+    // Initialize the flash IAP block device and print the memory layout
+    bd.init();
+    printf("Flash block device size: %llu\n",         bd.size());
+    printf("Flash block device read size: %llu\n",    bd.get_read_size());
+    printf("Flash block device program size: %llu\n", bd.get_program_size());
+    printf("Flash block device erase size: %llu\n",   bd.get_erase_size());
+
+    // Write "Hello World!" to the first block
+    char *buffer = (char*)malloc(bd.get_erase_size());
+    sprintf(buffer, "Hello World!\n");
+    bd.erase(0, bd.get_erase_size());
+    bd.program(buffer, 0, bd.get_erase_size());
+
+    // Read back what was stored
+    bd.read(buffer, 0, bd.get_erase_size());
+    printf("%s", buffer);
+
+    // Deinitialize the device
+    bd.deinit();
+}

FlashIAPBlockDevice/mbed-os.lib

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