LPC43xx RAM sections

example.c

#include "sections.h"

// See section names in linker script (*.ld)
// See: https://github.com/martinribelotta/micropython/blob/master/ciaa-nxp/ciaa_lpc4337.ld

// BSS is for non initialized variables (clear to zero on init)
static __BSS(RAM2) char heap[32*1024];

// DATA is for initialized variables
static __DATA(RAM2) char heap[32*1024] = { 0xff };

/* Posible section names:
 *   Section      MEMORY name
 *   (default) -> RamLoc32 (32K)
 *   RAM2      -> RamLoc40 (40K)
 *   RAM3      -> RamAHB32 (32K)
 *   RAM4      -> RamAHB16 (16K)
 *   RAM5      -> RamAHB_ETB16 (16K)
 */

sections.h

#ifndef __SECTIONS_H__
#define __SECTIONS_H__

#ifndef __SECTION_EXT
#define __SECTION_EXT(type, bank, name) __attribute__ ((section("." #type ".$" #bank "." #name)))
#endif

#ifndef __SECTION
#define __SECTION(type, bank) __attribute__ ((section("." #type ".$" #bank)))
#endif

#ifndef __DATA_EXT
#define __DATA_EXT(bank, name) __SECTION_EXT(data, bank, name)
#endif

#ifndef __BSS_EXT
#define __BSS_EXT(bank, name) __SECTION_EXT(bss, bank, name)
#endif

#ifndef __DATA
#define __DATA(bank) __SECTION(data, bank)
#endif

#endif