- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hello everyone,
I'm trying to use all of the memory of my eZdsp C5515 by allocating several global variable in a new memory section. I would like to use multiple data pages.
There is my .cmd file :
MEMORY
{
PAGE 0: /* ---- Unified Program/Data Address Space ---- */
MMR (RWIX): origin = 0x000000, length = 0x0000c0 /* MMRs */
DARAM0 (RWIX): origin = 0x0000c0, length = 0x00ff40 /* 64KB - MMRs */
SARAM0 (RWIX): origin = 0x010000, length = 0x010000 /* 64KB */
SARAM1 (RWIX): origin = 0x020000, length = 0x020000 /* 128KB */
SARAM2 (RWIX): origin = 0x040000, length = 0x00FE00 /* 64KB */
VECS (RWIX): origin = 0x04FE00, length = 0x000200 /* 512B */
SARAM3 (RWIX): origin = 0x050000, length = 0x1F0000 /* 31*64KB /!\ */
PDROM (RIX): origin = 0xff8000, length = 0x008000 /* 32KB */
PAGE 2: /* -------- 64K-word I/O Address Space -------- */
IOPORT (RWI) : origin = 0x000000, length = 0x020000
}
/* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */
SECTIONS
{
.text >> SARAM1|SARAM2|SARAM0 /* Code */
/* Both stacks must be on same physical memory page */
.stack > DARAM0 /* Primary system stack */
.sysstack > DARAM0 /* Secondary system stack */
.data >> DARAM0|SARAM0|SARAM1 /* Initialized vars */
.bss >> DARAM0|SARAM0|SARAM1 /* Global & static vars */
.const >> DARAM0|SARAM0|SARAM1 /* Constant data */
.sysmem > DARAM0|SARAM0|SARAM1 /* Dynamic memory (malloc) */
.switch > SARAM2 /* Switch statement tables */
.cinit > SARAM2 /* Auto-initialization tables */
.pinit > SARAM2 /* Initialization fn tables */
.cio > SARAM2 /* C I/O buffers */
.args > SARAM2 /* Arguments to main() */
.saram3 > SARAM3
vectors > VECS /* Interrupt vectors */
.ioport > IOPORT PAGE 2 /* Global & static ioport vars */
}
Now that my memory is allocated, I've created a global variable (which is present in SARAM1). First I'm trying to place the value in SARAM3 then changing the value of this global variable.
#pragma DATA_SECTION(sec1,".saram3");
Int16 sec1[TAILLE_DATA];
In the function which change the global variable, I'm writing this simple command following :
sec1[0]=2;
When I'm watching the Memory section, sec1 is at the address 0x028000 and when I'm watching the Disassembly code there is the following instruction :
MOV #2,*(#028000h)
The problem is that the address of the variable sec1 need to be coded with 24bits instead of 16bits and the instruction doesn't write the new value at the address 0x028000.
What I would like to know is how do we change the data page register in order to write a value at an address greater than 0x00FFFF?
Thank you for your time.
Best Regards.
