Revision 2:70419b9d778a, committed 2017-10-24

Comitter:

kgilbert

Date:

Tue Oct 24 23:32:54 2017 +0000

Parent:

1:8ad9777787ba

Commit message:

Add source for example

Changed in this revision

--- a/main.cpp	Wed Oct 18 20:03:25 2017 +0000
+++ b/main.cpp	Tue Oct 24 23:32:54 2017 +0000
@@ -1,23 +1,37 @@
 #include "mbed.h"
 #include "HeapBlockDevice.h"
 #include "ChainingBlockDevice.h"
-#include "FATFileSystem.h"
-    
+
+#define BLOCKSIZE 512
+char buffer1[512];
+char buffer2[512];
+
 int main(void) {
     // Create two smaller block devices with
     // 64 and 32 blocks of size 512 bytes
-    HeapBlockDevice mem1(64*512, 512);
-    HeapBlockDevice mem2(32*512, 512);
+    HeapBlockDevice mem1(64*BLOCKSIZE, BLOCKSIZE);
+    HeapBlockDevice mem2(32*BLOCKSIZE, BLOCKSIZE);
     
     // Create a block device backed by mem1 and mem2
     // contains 96 blocks of size 512 bytes
     BlockDevice *bds[] = {&mem1, &mem2};
     ChainingBlockDevice chainmem(bds);
     
-    // Format the new chained block device with a FAT filesystem
-    FATFileSystem::format(&chainmem);
+    // Initialize the block devices
+    chainmem.init();
+    
+    // Erase the block device to prepare for programming. 64 and 32 refer to
+    // the respective number of blocks in mem1 and mem2
+    chainmem.erase(0, (BLOCKSIZE * (64 + 32)));
     
-    // Create the FAT filesystem instance, files can now be written to
-    // the FAT filesystem as if to a single 96 x 512 byte storage device
-    FATFileSystem fat("fat", &chainmem);
+    // Program strings to the block device at byte-addressable locations that
+    // span both sub blocks. The second program will write past the end of the
+    // first block
+    chainmem.program("data for block", 0, BLOCKSIZE);
+    chainmem.program("Some more data", (65 * BLOCKSIZE), BLOCKSIZE);
+    
+    // Readback the written values
+    chainmem.read(&buffer1, 0, BLOCKSIZE);
+    chainmem.read(&buffer2, (65 * BLOCKSIZE), BLOCKSIZE);
+    printf("Read back: %s, %s\r\n", buffer1, buffer2);
 }
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