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cpu/esp32: support multiple heaps for newlib

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Several unsused DRAM sections are added to the heap.
This commit is contained in:
Gunar Schorcht 2020-07-10 08:42:01 +02:00
parent 4dc82bce70
commit fb47f094d3
3 changed files with 59 additions and 5 deletions
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5
cpu/esp32/include/cpu_conf.h
View File

@ -51,6 +51,11 @@ extern "C" {
*/
#define PRINTF_BUFSIZ 256
/**
* @brief Remaining parts of the various DRAM sections can be used as heap.
*/
#define NUM_HEAPS (4)
#ifdef __cplusplus
}
#endif

38
cpu/esp32/ld/esp32.common.ld
View File

@ -97,6 +97,13 @@ SECTIONS
_iram_start = ABSOLUTE(0);
} > iram0_0_seg
/* If Bluetooth is not used, this DRAM section can be used as heap */
. = _data_start_btdm; /* 0x3ffae6e0 */
. = ALIGN (4);
_sheap1 = ABSOLUTE(.);
. = 0x3ffb0000;
_eheap1 = ABSOLUTE(.);
.iram0.text :
{
/* Code marked as running out of IRAM */
@ -131,8 +138,21 @@ SECTIONS
INCLUDE esp32.spiram.rom-functions-iram.ld
_iram_text_end = ABSOLUTE(.);
/* IRAM can't be used as heap since it only allows 32-bit aligned access */
/*
. = ALIGN (4);
_sheap4 = ABSOLUTE(.);
*/
} > iram0_0_seg
/* IRAM can't be used as heap since it only allows 32-bit aligned access */
/*
. = 0x400a0000;
_eheap4 = ABSOLUTE(.);
*/
/* Starts at 0x3ffb000 if Bluetooth is not enabled, 0x3ffc0000 otherwise */
.dram0.data :
{
_data_start = ABSOLUTE(.);
@ -201,13 +221,23 @@ SECTIONS
_sheap = ABSOLUTE(.);
} >dram0_0_seg
/* TODO HEAP handling when BT is used
ETS system memory seems to start at 0x3FFE0000 if BT is not used.
This is the top of the heap for the app */
. = 0x3FFE0000;
/* Reserved ROM/ETS data start at 0x3ffe000. */
. = 0x3ffe0000;
_heap_top = ABSOLUTE(.);
_eheap = ABSOLUTE(.);
/* Reserved ROM/ETS data region for PRO CPU: 0x3ffe0000 ... 0x3ffe440 */
. = 0x3ffe0440;
_sheap2 = ABSOLUTE(.);
. = 0x3ffe4000;
_eheap2 = ABSOLUTE(.);
/* Reserved ROM/ETS data region for APP CPU: 0x3ffe4000 ... 0x3ffe4350 */
. = 0x3ffe4350;
_sheap3 = ABSOLUTE(.);
. = 0x40000000;
_eheap3 = ABSOLUTE(.);
.flash.rodata :
{
_rodata_start = ABSOLUTE(.);

21
cpu/esp_common/syscalls.c
View File

@ -326,10 +326,29 @@ void heap_caps_init(void)
extern uint8_t _eheap; /* end of heap (defined in ld script) */
extern uint8_t _sheap; /* start of heap (defined in ld script) */
extern uint8_t _sheap1;
extern uint8_t _eheap1;
extern uint8_t _sheap2;
extern uint8_t _eheap2;
extern uint8_t _sheap3;
extern uint8_t _eheap3;
unsigned int IRAM_ATTR get_free_heap_size(void)
{
struct mallinfo minfo = mallinfo();
return &_eheap - &_sheap - minfo.uordblks;
unsigned int heap_size = &_eheap - &_sheap;
#if NUM_HEAPS > 1
heap_size += &_eheap1 - &_sheap1;
#endif
#if NUM_HEAPS > 2
heap_size += &_eheap2 - &_sheap2;
#endif
#if NUM_HEAPS > 3
heap_size += &_eheap3 - &_sheap3;
#endif
return heap_size - minfo.uordblks;
}
/* alias for compatibility with espressif/wifi_libs */