File content as of revision 2:70419b9d778a:

#include "mbed.h"
#include "HeapBlockDevice.h"
#include "ChainingBlockDevice.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*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);
    
    // 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)));
    
    // 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);
}