What is the right value for readFlashDataPage(x) function? I

[Vlad]

Hi, 

I want to make my bootloader reading a flash data from address 0x40000

and due to its value load corresponding version. So, I have the following code of custom loader:

 

extern void* readFlashDataPage(unsigned int addr);

 
unsigned int dpVersion;
unsigned int imgAddr;
 
void init(void)
{
    unsigned int* page = (unsigned int*)readFlashDataPage(0x40000); 
    
    dpVersion = (page[0] == 0x00000002) ? 1 : 2;     
}
 
int checkCandidateImageVersion( int version )
{
    return dpVersion == version;
}
 
void recordCandidateImage( int version, unsigned int address )
{
    imgAddr = address;
}
 
unsigned int reportSelectedImage(void)
{
  return imgAddr;
}

 
But it seems doesn't work, there is version 1 is always loaded.
I can guess that I put incorrect address for readFlashDataPage() function,
but I tried to use 0x40000 and 1024 (block number), all the same.
Any ideas?
 
P.S.> I put 0x00000002 value with offset 0x40000 to the flash, and I also tried to revert
bits in comparision condition:
         dpVersion = (page[0] == 0x40000000) ? 1 : 2; 
Version 1 is loaded without any problems if I use next expression:
         dpVersion = 1; 

[Ross]

My understanding from the source code is page number (see below). Note the addition of the dataPartitionBase though!

int fl_readDataPage(unsigned n, unsigned char dst[])
{
    unsigned address;
    if( n >= fl_getNumDataPages() ) { return( 1 ); }
      address = fl_getDataPartitionBase() + n * fl_getPageSize();

    return fl_readPage(address, dst);
}