Classic/Legacy CodeWarriorのトピックRe: How do you force byte writes to memory using CW?

How do you force byte writes to memory using CW?

nanoGeek — Thu, 23 Feb 2006 23:53:19 GMT

I am using the following code segment to write a data byte to an absolute memory location, held in "address" :

*(uint8 *)(address) = (uint8)data;

uint8 is defined as follows:

typedef unsigned short int uint8;

The problem is, the code is doing word (16 bit) memory accesses. What am I doing wrong?

Thanks,

Joe

Message Edited by nanoGeek on 02-23-200609:59 AM

Message Edited by nanoGeek on 02-23-200610:00 AM

Re: How do you force byte writes to memory using CW?

desroc01 — Fri, 24 Feb 2006 01:14:07 GMT

You can write in RAM like this :

//SOLUTION 1 :

//All pointer size depends of the machine.. (i.e 2 bytes)
char *memPtr;
char theContent;
unsigned short int memItr;

//Initialize ram (write) //0x1000 to 0x1010
//... We write to 16 locations
memPtr = (signed char*) 0x1000;
for (memItr = 0 ; memItr 16 ; memItr++)
{
(*memPtr) = 0x55; //Write an acsii char..
memPtr = memPtr + 1;
}

//Init the ptr and itr
memPtr = (signed char*) 0x1000; //Memory ptr
memItr = 0;

//Display
printf("Memory display (Ram 0x1000 to 0x1010)... ");
for (memItr;memItr16
{
memItr++; theContent = (*memPtr); //display the content.(HEX_TO_ASCII?)
memPtr = memPtr + 1;
}

//SOLUTION 2 :
char lFillRam[ARR_DIM]; //Array of character
for (memItr=0 ; memItr
{
lFillRam[memItr] = 'U';
}

If you want to write in Flash or Eeprom, you have to follow some special algorithm (procedure). See the AN for you MCU

Re: How do you force byte writes to memory using CW?

bigmac — Fri, 24 Feb 2006 11:41:00 GMT

Hello Joe,

It seems that a short is actually 16 bit size. I had no problem with the following code:

typedef unsigned char byte;

byte data = 0x41;
byte *address;
byte dest;

address = &temp;
*address = data;

Regards,
Mac