add synology auto-poweron manager

2 files changed, 157 insertions, 0 deletions

diff --git a/synology-autopoweron/Makefile b/synology-autopoweron/Makefile
new file mode 100644
index 0000000..2646d03
--- /dev/null
+++ b/synology-autopoweron/Makefile
@@ -0,0 +1,39 @@
+DEVICE     = attiny25
+CLOCK      = 1000000
+FUSES      = -U lfuse:w:0x62:m -U hfuse:w:0xdd:m
+
+PROGRAMMER = avrdude
+PROGRAMMER += -c buspirate
+PROGRAMMER += -P /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A400XJSH-if00-port0
+PROGRAMMER += -p $(DEVICE) -B 4
+
+DEFS    = -DF_CPU=$(CLOCK)UL
+CFLAGS  = -Wall -Werror -pedantic -std=c99
+CFLAGS += -O2 -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -mmcu=$(DEVICE) $(DEFS)
+#LIBS    = -Wl,--relax,--gc-sections,--print-gc-sections,--entry=main
+#LIBS = -Wl,--entry=main,--gc-sections,--rela
+#LDFLAGS = $(LIBS)
+
+all: main.hex size
+
+main.hex: main.c
+	avr-gcc -o main.elf $? $(CFLAGS) $(LDFLAGS)
+	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
+
+f: flash
+flash: all
+	$(PROGRAMMER) -U flash:w:main.hex:i
+
+fuse:
+	$(PROGRAMMER) $(FUSES)
+
+clean:
+	rm -f *.o *.elf *.hex
+
+size:
+	avr-size --mcu=$(DEVICE) -t -A main.elf
+	avr-size --mcu=$(DEVICE) -C main.elf
+	avr-nm --size-sort main.elf
+
+
diff --git a/synology-autopoweron/main.c b/synology-autopoweron/main.c
new file mode 100644
index 0000000..698a887
--- /dev/null
+++ b/synology-autopoweron/main.c
@@ -0,0 +1,118 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+
+/* Pinout used:
+ *         -----
+ * !reset - MCU - Vcc
+ * NA     - MCU - NA
+ * NA     - MCU - NA
+ * GND    - MCU - (PB0) powerbutton
+ *         -----
+ */
+
+static const uint8_t SLEPT_TIMEOUT = 25;  /* ~2.5s */
+
+static void init_timer()
+{
+    /* timer_resolution = 1 / (clock_speed / prescaler)
+     * timer_resolution = 1 / (10**6 / 1024)
+     *
+     * in ctc mode, target counts:
+     *
+     * timer_counts = (target_time / timer_resolution) - 1
+     * timer_counts = (0.1         / (1/(10**6/1024))) - 1
+     * timer_counts = 96.65625000000001 =~ 97
+     *
+     * Why did we add the extra +1 to our number of timer counts? In CTC mode,
+     * when the timer matches our desired count it will reset itself to zero.
+     * This takes one clock cycle to perform, so we need to factor that into
+     * our calculations.
+     *
+     * VG notes: more simply 0 to 97 = 98 values = 98 cycles.
+     *
+     * trigger_time = (97+1) * (1/(10**6 / 1024)) =~ 0.100352s
+     *
+     * WGM0[2:0] = 010 = CTC
+     */
+    TCCR0A =
+            (1 << WGM01) |     // CTC
+            (0 << WGM00);      // CTC
+    TCCR0B =
+            (0 << WGM02) |     // CTC
+            (1 << CS02)  |     // CS0[2:0] = 101 => prescaler clk/1024
+            (0 << CS01)  |     // CS0[2:0] = 101 => prescaler clk/1024
+            (1 << CS00);       // CS0[2:0] = 101 => prescaler clk/1024
+    OCR0A = 97;
+    TIMSK =
+            (1 << OCIE0A) |    // enable CTC interrupt for compare match 0A
+            (0 << OCIE0B) |    // disable CTC interrupt for compare match 0B
+            (0 << TOIE0);      // disable interrupt for timer0 overflow
+
+}
+
+static volatile uint8_t sleep_time;
+
+ISR(TIMER0_COMPA_vect)
+{
+    ++sleep_time;
+}
+
+static uint8_t get_sleep_time(void)
+{
+    return sleep_time;
+}
+
+static void reset_sleep_time(void)
+{
+    sleep_time = 0;
+}
+
+static void button_pushed()
+{
+    PORTB &= ~(1 << PB3); /* make sure reset line is disabled */
+    PORTB |= (1 << PB4); /* activate plug modules set */
+}
+
+static void button_normal()
+{
+    /* be sure set line is not active before doing a reset else both coil will
+     * be energized at the same time and thus the behaviour may be
+     * unpredictable. */
+    plug_unset();
+    /* activate module reset */
+    PORTB |= (1 << PB3);
+}
+
+int main()
+{
+    cli();
+    init_timer();
+    sei();
+
+    // Normally a loop is not required but if somehow the mcu woke up from its
+    // sleep state this ensure we can do the operation again.
+    for (;;) {
+        reset_sleep_time();
+
+        PORTB = 0; // outputs set to low and input not set to internal pull-up
+
+        // digital output, pull-down for a time then go to default PB0 = Hi-Z
+        DDRB |= (1 << PB0);
+        while (get_sleep_time() <= SLEPT_TIMEOUT);
+        DDRB &= ~(1 << PB0);
+
+        /* set low power mode */
+        power_all_disable(); // disable all peripherals
+        set_sleep_mode(<mode>); // sleep mode
+        sleep_enable();         // set register to enable sleep
+        sleep_bod_disable();    // disable bod to consume even less
+        //sei();                // normally set sei to ensure wakeup but I do
+                                // not want to wake up appart from a power
+                                // reset
+        sleep_cpu();            // put cpu to sleep = low power mode now
+        sleep_disable();        // clear register (if somehow mcu woke up)
+    }
+
+    return 0;
+}