From 9f96509a454174fd10ed9924a9da81dd60bc8195 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Mon, 29 Feb 2016 13:36:34 +0100
Subject: add support for a powerdown image

---
 src/display.cc |  1 +
 src/system.cc  | 74 ++++++++++++++++++++++++++++++++++------------------------
 src/system.h   | 12 ++++++++++
 3 files changed, 57 insertions(+), 30 deletions(-)

diff --git a/src/display.cc b/src/display.cc
index 87d863f..b7942e8 100644
--- a/src/display.cc
+++ b/src/display.cc
@@ -125,6 +125,7 @@ void Display::reset()
 		disp_buf[i] = 0xff;
 	str_pos = 0;
 	char_pos = -1;
+	need_update = 1;
 	status = RUNNING;
 }
 
diff --git a/src/system.cc b/src/system.cc
index d8c27ab..9867c17 100644
--- a/src/system.cc
+++ b/src/system.cc
@@ -46,9 +46,28 @@ void System::initialize()
 
 	sei();
 
+	current_anim_no = 0;
+	loadPattern(0);
+}
+
+void System::loadPattern(uint8_t anim_no)
+{
 	if (storage.hasData()) {
-		current_anim_no = 0;
-		loadPattern(0);
+		storage.load(anim_no, disp_buf);
+
+		active_anim.type = (AnimationType)(disp_buf[0] >> 4);
+		active_anim.length = disp_buf[1];
+
+		if (active_anim.type == AnimationType::TEXT) {
+			active_anim.speed = (disp_buf[2] & 0xf0) + 15;
+			active_anim.delay = (disp_buf[2] & 0x0f ) << 4;
+			active_anim.direction = disp_buf[3] >> 4;
+		} else if (active_anim.type == AnimationType::FRAMES) {
+			active_anim.speed = ((disp_buf[2] & 0x0f) << 4) + 15;
+			active_anim.delay = (disp_buf[3] & 0x0f) << 2;
+		}
+
+		active_anim.data = disp_buf + 4;
 	} else {
 		active_anim.type = AnimationType::TEXT;
 		active_anim.speed = (2 << 4) + 15;
@@ -88,30 +107,6 @@ void System::initialize()
 	display.show(&active_anim);
 }
 
-void System::loadPattern(uint8_t anim_no)
-{
-	if (!storage.hasData())
-		return;
-
-	storage.load(anim_no, disp_buf);
-
-	active_anim.type = (AnimationType)(disp_buf[0] >> 4);
-	active_anim.length = disp_buf[1];
-
-	if (active_anim.type == AnimationType::TEXT) {
-		active_anim.speed = (disp_buf[2] & 0xf0) + 15;
-		active_anim.delay = (disp_buf[2] & 0x0f ) << 4;
-		active_anim.direction = disp_buf[3] >> 4;
-	} else if (active_anim.type == AnimationType::FRAMES) {
-		active_anim.speed = ((disp_buf[2] & 0x0f) << 4) + 15;
-		active_anim.delay = (disp_buf[3] & 0x0f) << 2;
-	}
-
-	active_anim.data = disp_buf + 4;
-
-	display.show(&active_anim);
-}
-
 // ! This function has not been tested yet
 void System::receive(void)
 {
@@ -268,16 +263,31 @@ void System::loop()
 
 void System::shutdown()
 {
-	// turn off display to indicate we're about to shut down
-	display.disable();
-
 	modem.disable();
 
+	// show power down image
+	disp_buf[0] = systemPowerdownImage[0];
+	disp_buf[1] = systemPowerdownImage[1];
+	disp_buf[2] = systemPowerdownImage[2];
+	disp_buf[3] = systemPowerdownImage[3];
+	disp_buf[4] = systemPowerdownImage[4];
+	disp_buf[5] = systemPowerdownImage[5];
+	disp_buf[6] = systemPowerdownImage[6];
+	disp_buf[7] = systemPowerdownImage[7];
+	active_anim.data = disp_buf;
+	active_anim.type = AnimationType::FRAMES;
+	active_anim.length = 8;
+	display.show(&active_anim);
+	display.update(); // we left the main loop, so we need to call this manually
+
 	// wait until both buttons are released
 	while (!((PINC & _BV(PC3)) && (PINC & _BV(PC7)))) ;
 
 	// and some more to debounce the buttons
-	_delay_ms(10);
+	_delay_ms(50);
+
+	// turn off display to indicate we're about to shut down
+	display.disable();
 
 	// actual naptime
 
@@ -293,7 +303,11 @@ void System::shutdown()
 	// Don't disable PCICR, something else might need it.
 	PCMSK1 &= ~(_BV(PCINT15) | _BV(PCINT11));
 
+	// debounce
+	_delay_ms(50);
+
 	// turn on display
+	loadPattern(current_anim_no);
 	display.enable();
 
 	// ... and modem
diff --git a/src/system.h b/src/system.h
index d72fe8a..36e8e37 100644
--- a/src/system.h
+++ b/src/system.h
@@ -2,6 +2,18 @@
 
 #define SHUTDOWN_THRESHOLD 2048
 
+// TODO find a nice image
+const uint8_t systemPowerdownImage[] = {
+	0x00,
+	0x00,
+	0x08,
+	0x08,
+	0x08,
+	0x08,
+	0x00,
+	0x00
+};
+
 /**
  * Contains the system idle loop. Checks for button presses, handles
  * standby/resume, reads data from the Modem and updates the Display.
-- 
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