ZVC read a specific byte in P-Flash memory

michael_90300 — Mon, 24 Aug 2020 06:51:35 GMT

Hello All,

I have to change my micro from a S12G64 to a ZVC19.

In my program, I have a line to read a specific byte in the P-Flash.

The problem in S12G64, the address has been converted from Global Memory Address to Local Memory address, I am not sure I have to do the same thing ZVC...

In S12G64 my code was:

// Addr variable is Global address, for example 0x38010 for a byte in Page 0xE

#define GlobalToLocal(Address) (((Address) & 0x3FFFU) | (((Address) & 0x003FC000UL) << 2U) | 0x8000U)

unsigned char mybyte;

mybyte= *(unsigned char *far)(GlobalToLocal(Addr));

I would like to know if the Following code is right on ZVC:

// In prm, ROM is defined form 0xFD0000 to 0xFFFDFF

// I would like to read Global Address Addr = 0xFE0010

unsigned char mybyte;

mybyte= *(unsigned char *far)(Addr);

Thank you for your help

Best regards

Re: ZVC read a specific byte in P-Flash memory

lama — Mon, 24 Aug 2020 17:32:31 GMT

Hi,

there is a difference between MCUs from the memory space point of view. S12Z devices use 24bit linear space only. So for example:

//.........................................
// read the flash
//.........................................

for(addrl=0xFF8000UL; addrl<=0xFF8FFFUL; addrl+=2)
   {
     result = PFLASH_Read_Word(addrl);
   }

//==============================================================================
//PFLASH_Read_Byte
//==============================================================================
unsigned char PFLASH_Read_Byte(unsigned long int address)
{
unsigned char data8;
data8 = *(unsigned char *)address;
return data8;
}

//==============================================================================
//PFLASH_Read_Word
//==============================================================================
unsigned int PFLASH_Read_Word(unsigned long int address)
{
unsigned int data16;
data16 = *(unsigned int *)address;
return data16;
}

Best regards,

Ladislav

topic ZVC read a specific byte in P-Flash memory in S12 / MagniV Microcontrollers

ZVC read a specific byte in P-Flash memory

Re: ZVC read a specific byte in P-Flash memory