Locate Heap in SDRAM

You'd modify the heap in startup_stm32f4xx.s, and then create a scatter file to direct the HEAP section into the memory area you've described for the SDRAM

It is possible in more detail? What it is necessary to add to the scatter file?

// STM32 Keil SDRAM HEAP STM32F429I-DISCO - sourcer32@gmail.com
// Use MicroLIB checked in options
// Use Scatter file in Linker options (not Memory Layout from Target Dialog)
/* heap.sct
LR_IROM1 0x08000000 0x00200000 { ; load region size_region
ER_IROM1 0x08000000 0x00200000 { ; load address = execution address
*.o (RESET, +First)
*(InRoot$$Sections)
.ANY (+RO)
}
RW_IRAM1 0x20000000 0x00030000 { ; Internal SRAM
.ANY (+RW +ZI)
}
RW_IRAM2 0x10000000 UNINIT 0x00010000 { ; Internal CCM SRAM
*(.ccm)
}
RW_RAM1 0xD0000000 UNINIT 0x00800000 { ; External SDRAM
*(HEAP)
}
}
*/
/* startup_stm32f429_439xx.s
...
Heap_Size EQU 0x00800000
AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit
...
*/
#include <
stdio.h
>
#include <
stdlib.h
>
#include ''stm32f429i_discovery.h''
#include ''stm32f429i_discovery_sdram.h''
/**************************************************************************************/
int main(void)
{
char *p;
/* Make sure to initialize the external memory, pins and buses before using them */
/* SDRAM Initialization */
SDRAM_Init();
/* Disable write protection */
FMC_SDRAMWriteProtectionConfig(FMC_Bank2_SDRAM,DISABLE);
p = malloc(0x1000);
printf(''Allocation at %p
'', p);
free(p);
while(1); // Don't want to exit
}
//******************************************************************************
// Hosting of stdio functionality through SWV - Serial Wire Viewer
//******************************************************************************
#include <
rt_misc.h
>
#pragma import(__use_no_semihosting_swi)
struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;
int fputc(int ch, FILE *f)
{
ITM_SendChar(ch);
return(ch);
}
int fgetc(FILE *f)
{
char ch;
ch = '?';
return((int)ch);
}
int ferror(FILE *f)
{
/* Your implementation of ferror */
return EOF;
}
void _ttywrch(int ch)
{
ITM_SendChar(ch);
}
void _sys_exit(int return_code)
{
label: goto label; /* endless loop */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d

'', file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif

Thank you very much

I use

in my project

as FreeRTOS. FreeRTOS

has its own heap.

/* Allocate the memory for the heap. */
static unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];

Can

I

place

this

heap

on the

ow to do it

correctly

Probably

__attribute__((section(''HEAP''))) static unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];