Jinguang Guo / Flashwrite_testing

ec521

Dependencies:   mbed

flashwrite.cpp@0:e2f78ce2a5cf, 2018-04-22 (annotated)

Committer:
gaving
Date:
Sun Apr 22 19:20:10 2018 +0000
Revision:
0:e2f78ce2a5cf
For EC521 only

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gaving 0:e2f78ce2a5cf 1 #include "mbed.h"
gaving 0:e2f78ce2a5cf 2 #include "FreescaleIAP.h"
gaving 0:e2f78ce2a5cf 3
gaving 0:e2f78ce2a5cf 4 int flashwrite() {
gaving 0:e2f78ce2a5cf 5
gaving 0:e2f78ce2a5cf 6 int address = flash_size() - SECTOR_SIZE; //Write in last sector
gaving 0:e2f78ce2a5cf 7 int *data = (int*)address;
gaving 0:e2f78ce2a5cf 8
gaving 0:e2f78ce2a5cf 9 //By default flash is initialized at 0xFF, this is signed -1, so now we know
gaving 0:e2f78ce2a5cf 10 //the program runs for the first time. You of course need to make sure your program
gaving 0:e2f78ce2a5cf 11 //never writes -1 to this variable if you use this method
gaving 0:e2f78ce2a5cf 12
gaving 0:e2f78ce2a5cf 13 //Alternatively you could also do the same, but with a seperate "initial run" variable added,
gaving 0:e2f78ce2a5cf 14 //so your other variables can take any value
gaving 0:e2f78ce2a5cf 15 if (data[0] == -1) {
gaving 0:e2f78ce2a5cf 16 printf("Initial run\r\n");
gaving 0:e2f78ce2a5cf 17 printf("Writing 42 and 42\r\n");
gaving 0:e2f78ce2a5cf 18 erase_sector(address);
gaving 0:e2f78ce2a5cf 19 int newvalues[2] = {42, 42};
gaving 0:e2f78ce2a5cf 20 program_flash(address,(char*) newvalues, 8); //Two integers of 4 bytes = 8 bytes
gaving 0:e2f78ce2a5cf 21 while(1);
gaving 0:e2f78ce2a5cf 22 }
gaving 0:e2f78ce2a5cf 23 printf("Current = %d and %d, new is %d and %d\r\n", data[0], data[1], data[0]+1, data[1]-1);
gaving 0:e2f78ce2a5cf 24 int newvalues[2] = {data[0]+1, data[1]-1};
gaving 0:e2f78ce2a5cf 25 erase_sector(address);
gaving 0:e2f78ce2a5cf 26 program_flash(address, (char*) newvalues, 8);
gaving 0:e2f78ce2a5cf 27 while(1);
gaving 0:e2f78ce2a5cf 28 }