Commit 6e43e8e9 authored by Daniel Friesel's avatar Daniel Friesel
Browse files

MSP430: save & restore entire SRAM to/from FRAM

parent 50d32b10

Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ COMMON_FLAGS = -g -Os -Wall -Wextra 
CFLAGS = -std=c99

CXXFLAGS = -std=c++14 -fno-rtti -fno-threadsafe-statics



ASM_TARGETS =

C_TARGETS =

CXX_TARGETS = src/app/${app}/main.cc src/os/object/cpp_helpers.cc src/os/object/outputstream.cc

src/app/transactiontest/Makefile.inc

0 → 100644
+5 −0
Original line number Diff line number Diff line 
timer_cycles ?= 1

timer_s ?= 1

loop ?= 1



ASM_TARGETS += src/app/transactiontest/util.S
 
 No newline at end of file

src/app/transactiontest/main.cc

0 → 100644
+64 −0
Original line number Diff line number Diff line 
#include "arch.h"

#include "driver/gpio.h"

#include "driver/stdout.h"

#include "driver/uptime.h"



#ifndef TIMER_CYCLES

#error makeflag timer_cycles=1 required

#endif



extern "C" {

	void asm_save_toc();

	void asm_load_toc();

}



volatile bool __attribute__((section(".text"))) have_state = false;

uint16_t i = 0;



void restore_state()

{

	if (!have_state) {

		return;

	}

	asm_load_toc();

}



void save_state()

{

	asm_save_toc();

	have_state = true;

}



void loop(void)

{

	gpio.led_toggle(1);

	kout << dec << i << endl;

	i++;

	if (i == 5) {

		save_state();

	}

	if (i == 10) {

		restore_state();

	}

}



int main(void)

{

	arch.setup();

	gpio.setup();

	kout.setup();



	restore_state();



	gpio.led_on(0);

	kout << "Hello, World!" << endl;

	kout << "Test, World!" << endl;

	kout << dec << uptime.get_cycles() << endl;

	kout << dec << uptime.get_cycles() << endl;

	kout << dec << uptime.get_cycles() << endl;

	kout << dec << uptime.get_cycles() << endl;



	arch.idle_loop();



	return 0;

}

src/app/transactiontest/util.S

0 → 100644
+46 −0
Original line number Diff line number Diff line 
.global asm_save_toc

.global asm_load_toc



stack_backup:

    .space 2048



sp_backup:

    .space 2



asm_save_toc:

    .irp reg,4,5,6,7,8,9,10,11

    push r\reg

    .endr



    mov r1, &sp_backup



    mov #1c00h, r10

    mov #stack_backup, r11



save_sram_word:

    mov @r10+, 0(r11)

    add #2, r11

    cmp #1c00h+2048, r10

    jlo save_sram_word



    pop r11

    pop r10

    add #12, r1

    ret



asm_load_toc:

    mov #stack_backup, r10

    mov #1c00h, r11



load_sram_word:

    mov @r10+, 0(r11)

    add #2, r11

    cmp #1c00h+2048, r11

    jlo load_sram_word



    mov &sp_backup, r1

    .irp reg,11,10,9,8,7,6,5,4

    pop r\reg

    .endr



    ret
 
 No newline at end of file

src/arch/msp430fr5969lp/Makefile.inc

+4 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ else 
endif





OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o}

OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o} ${ASM_TARGETS:.S=.o}



.cc.o:

	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}
@@ -75,6 +75,9 @@ OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o} 
.c.o:

	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} ${CFLAGS} -c -o $@ ${@:.o=.c}



.S.o:

	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} -Wa,-gstabs,-ggdb -x assembler-with-cpp -c -o $@ ${@:.o=.S}



build/system.elf: ${OBJECTS}

	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} \

		-Wl,--library-path=/opt/msp430/ti/gcc/include/ \