MSP430: save & restore entire SRAM to/from FRAM

3 files changed, 115 insertions, 0 deletions

diff --git a/src/app/transactiontest/Makefile.inc b/src/app/transactiontest/Makefile.inc
new file mode 100644
index 0000000..586a484
--- /dev/null
+++ b/src/app/transactiontest/Makefile.inc
@@ -0,0 +1,5 @@
+timer_cycles ?= 1
+timer_s ?= 1
+loop ?= 1
+
+ASM_TARGETS += src/app/transactiontest/util.S
\ No newline at end of file
diff --git a/src/app/transactiontest/main.cc b/src/app/transactiontest/main.cc
new file mode 100644
index 0000000..e359e67
--- /dev/null
+++ b/src/app/transactiontest/main.cc
@@ -0,0 +1,64 @@
+#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;
+}
diff --git a/src/app/transactiontest/util.S b/src/app/transactiontest/util.S
new file mode 100644
index 0000000..bf2530d
--- /dev/null
+++ b/src/app/transactiontest/util.S
@@ -0,0 +1,46 @@
+.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