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decrease RAM usage using PROGMEM

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This commit is contained in:
AndreiD
2017-02-19 14:53:17 +02:00
committed by Ivan Grokhotkov
parent 8afe55267a
commit feed1ca219
9 changed files with 103 additions and 35 deletions
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16
Makefile
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@@ -4,8 +4,6 @@ AR := $(TOOLCHAIN_PREFIX)ar
LD := $(TOOLCHAIN_PREFIX)gcc
OBJCOPY := $(TOOLCHAIN_PREFIX)objcopy
MFORCE32 := $(shell $(CC) --help=target | grep mforce-l32)
XTENSA_LIBS ?= $(shell $(CC) -print-sysroot)
@@ -43,13 +41,17 @@ LDFLAGS += -L$(XTENSA_LIBS)/lib \
CFLAGS+=-std=c99 -DESP8266
CFLAGS += -Wall -Os -g -O2 -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mno-text-section-literals -D__ets__ -DICACHE_FLASH
CFLAGS += -Wall -Os -g -O2 -Wpointer-arith -Wl,-EL -nostdlib -mlongcalls -mno-text-section-literals -D__ets__ -DICACHE_FLASH
MFORCE32 := $(shell $(CC) --help=target | grep mforce-l32)
ifneq ($(MFORCE32),)
# Your compiler supports the -mforce-l32 flag which means that
# constants can be stored in flash (program) memory instead of SRAM.
# See: https://www.arduino.cc/en/Reference/PROGMEM
CFLAGS += -DPROGMEM="__attribute__((aligned(4))) __attribute__((section(\".irom.text\")))" -mforce-l32
# If the compiler supports the -mforce-l32 flag, the compiler will generate correct code for loading
# 16- and 8-bit constants from program memory. So in the code we can directly access the arrays
# placed into program memory.
CFLAGS += -mforce-l32
else
# Otherwise we need to use a helper function to load 16- and 8-bit constants from program memory.
CFLAGS += -DWITH_PGM_READ_HELPER
endif
BIN_DIR := bin