Guest wrote:
> Hi,
> I use eclipse and the GNU ARM Compiler suit for Windows
> I must store some char in flash on Phillips lpc2148.
> I have defined the varriable test:
>
> unsigned char test _attribute_ ((section (".mySection"))) = 48;
>
> and the compiler call is:
>
> arm-elf-ld -v -S -M -section-start=.mySection=0x00010000
>
> the problem is now, the lpc2148 restart if I would write to "test"
> how I could write to the varriable?!?

You can not simply modify the flash-content like this. Read the section
about IAP in the LPC214x manual.

Martin Thomas

Guest wrote:

> #define IAP_LOCATION  0x7FFFFFF0
Where did you get this from? AFAIK the IAP-entry function is thumb-code
so this should be an odd number.

>   IAP_Entry(iap_command,iap_result);
How does the Compiler translate this? Can you show the assembler-code
for this? Is IAR_Write compiled for thumb or ARM-mode?


Martin Thomas

Guest wrote:
> Thx, I misread the IAP_LOCATION. With the new adress 0x7FFFFFF1 the
> Prepare
> command works fine.
> New problemm is, if I will write to flash the source adress is not on a
> correct boundary.
>
> void IAP_Write (void)
> {
>   // Copy RAM to Flash
>   // setting function pointer
>   IAP_Entry = (IAP) IAP_LOCATION;
>   // set command code
>   iap_command[0] = 51;
>   // destination flash where data byte to be written
>   iap_command[1] = (unsigned long)0x00018000;
>   // source RAM address where data bytes are to be read
>   iap_command[2] = (unsigned short)&contrast_lokal;
>   // number of bytes to be written
>   iap_command[3] = 256;
>   // set system clock frequency, unit kHz
>   iap_command[4] = 60000;
>   // prepare sectors for write
>   IAP_Entry(iap_command,iap_result);
> }
>
> I inexperienced about thumb and arm mode because the arm porzessor is
> new for me.

hi,
i am using LPC-2148 and want to write some coefficients in Flash i have
tried to use IAP code as given in the manual, but it is not working. it
seems you have faced same problem few days back. can you please guide me
how to use this IAP functions for FLash read or Write and how to select
Thumb mode