topic Re: need help ????????? in Classic/Legacy CodeWarrior

need help ?????????

davidacosta — Wed, 21 Oct 2015 19:09:45 GMT

//***********************************

//unsigned int *FLASH_address_pointer; // after the includes

//***********************************

void READ_Flash(void) { // move 128 bytes from FLASH at 0xF800 to FLASH_data[pt]

byte pt;

byte tmp;

FLASH_address_pointer=0xF800+8 ; // +8 offset for test only

for(pt=0;pt<128;pt++)

{

tmp = (byte)(&FLASH_address_pointer[pt]); // why does FLASH_address_pointer inc by two ??????

FLASH_data[pt] = tmp ; // you can see it in disassemble

} // help COLDFIRE V1, code warrior V6.3

}

Re: need help ?????????

davidacosta — Thu, 22 Oct 2015 15:41:24 GMT

fixed with "FLASH_data[pt]=((byte*)FLASH_addr)[pt];"

mods please delete this thread

Re: need help ?????????

trytohelp — Fri, 23 Oct 2015 07:12:45 GMT

Hi David,

If you've problem, can you please provide us more details ?

tmp displays a part of address of the FLASH_address_pointer which is 0xf808.

The FLASH_address_pointer is an unsigned int so coded on 4 bits.

Each time the pointer is incremented, 4 bit is added the memory address and you will have:

tmp = 8

tmp = 12

tmp = 16

...

According to the \CodeWarrior for Microcontrollers V6.3\Help\PDF\ColdFireV1_Build_Tools_Reference.pdf manual - page 190, we know:

bool/char is coded on 8 bits

short is coded on 16 bits

int if "4-Byte Integers is off" is coed on 16 bits

int if "4-Byte Integers is on" is coed on 32 bits

long is coded on 32 bits

long long is coded on 64 bits

Have a great day,
Pascal
Freescale Technical Support
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Re: need help ?????????

StenS — Mon, 26 Oct 2015 07:18:08 GMT

Since FLASH_address_pointer is a pointer to an integer (16-bits = 2 bytes) it means that FLASH_address_pointer[0] points to F808, FLASH_address_pointer[1] to the next integer = F80A, etc. If FLASH_adress_pointer would point to a char (8 bits = 1 byte), you would get an increment by one.

/Sten