Hi all,
 
I need to create a function that copies a complete flash segment to RAM
but I should be able to call the function with any address within that
segment, and the function should be able to find the start of the
section it self.
 
Example:
/***********************************************************************
**************************
Function :        flash_Push
Parameter :       *dest    : pointer to updated copy of data in RAM
                  *src            : pointer to start of destination
flash segment
Date :            06/11/2003
Description :     flash_Push copies the content of the flash segment
containing src
                                                 into ram segment dest.
but prior to doeing so, it first needs to find the start
                                                 of the segment.
************************************************************************
*************************/
void flash_Push  ( U8 *dest, U8 *src ){
            U8 i;
            
            src = (U8*)((WORD)(src) & 0xF000);   // wrap around for
flash page base address
            
            for(i=0;i<512;i++)
                        dest[i] = *src++;
}
 
U8 Container [512] ;
flash_Push  ( container, 0x1250 ); // should copy from $1200 to $13FF
 
 
thanks Martijn.
 

The segments occur every 512 bytes unless it is segment A or B or (and 
this doesn't appear to be documented, the first segment.

	1000h is the start of dataflash segment A
	107fh is the end of seg A
	1080h is the start of segB
	10ffh is the end of seg B
	1100h is the start of segment 0
	11ffh is the end of segment 0, this is a short (256 byte segment

All other segments are 512 bytes long and start with an even number as 
the MSB of the address (12xxH etc) hence the address of the start of a 
segment can be found by ANDing the address of any location within that 
segment with 0FE00H, unless the address of the location is less then 11FFH.

A quick tip, use the word write not byte write procedure. it is faster 
when copying segments are writing large tracts of flash.

Al

Martijn Broens wrote:

> Hi all,
>  
> I need to create a function that copies a complete flash segment to RAM
> but I should be able to call the function with any address within that
> segment, and the function should be able to find the start of the
> section it self.
>  
> Example:
> /***********************************************************************
> **************************
> Function :        flash_Push
> Parameter :       *dest    : pointer to updated copy of data in RAM
>                   *src            : pointer to start of destination
> flash segment
> Date :            06/11/2003
> Description :     flash_Push copies the content of the flash segment
> containing src
>                                                  into ram segment dest.
> but prior to doeing so, it first needs to find the start
>                                                  of the segment.
> ************************************************************************
> *************************/
> void flash_Push  ( U8 *dest, U8 *src ){
>             U8 i;
>             
>             src = (U8*)((WORD)(src) & 0xF000);   // wrap around for
> flash page base address
>             
>             for(i=0;i<512;i++)
>                         dest[i] = *src++;
> }
>  
> U8 Container [512] ;
> flash_Push  ( container, 0x1250 ); // should copy from $1200 to $13FF
>  
>  
> thanks Martijn.
>  
> 
> 
> 
> 
> 
> 
> .
> 
>  
> 
> ">http://docs.yahoo.com/info/terms/ 
> 
> 
> 

Hi,

because functions decay implicitly into pointers in expressions (the value
of) flash_Push is the start address.

Rolf


-----------------------------
Hi all,

I need to create a function that copies a complete flash segment to RAM
but I should be able to call the function with any address within that
segment, and the function should be able to find the start of the
section it self.

Example:
/***********************************************************************
**************************
Function :        flash_Push
Parameter :       *dest    : pointer to updated copy of data in RAM
                  *src            : pointer to start of destination
flash segment
Date :            06/11/2003"
Description :     flash_Push copies the content of the flash segment
containing src
                                                 into ram segment dest.
but prior to doeing so, it first needs to find the start
                                                 of the segment.
************************************************************************
*************************/
void flash_Push  ( U8 *dest, U8 *src ){
            U8 i;
            
            src = (U8*)((WORD)(src) & 0xF000);   // wrap around for
flash page base address
            
            for(i=0;i<512;i++)
                        dest[i] = *src++;
}

U8 Container [512] ;
flash_Push  ( container, 0x1250 ); // should copy from $1200 to $13FF


thanks Martijn.