From 83d6a0ee679e73c89d0ba84602d3052527726230 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Fri, 22 Jan 2016 16:27:33 +0100
Subject: make display buffer private, add separate modem receive buffer

---
 src/display.cc | 18 +++++++++---------
 src/display.h  |  3 ++-
 src/main.cc    |  8 +-------
 src/system.cc  |  6 ++++--
 4 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/src/display.cc b/src/display.cc
index b0bc636..42710c9 100644
--- a/src/display.cc
+++ b/src/display.cc
@@ -11,14 +11,6 @@ Display display;
 
 Display::Display()
 {
-	disp_buf[0] = 0xff;
-	disp_buf[1] = 0xfb;
-	disp_buf[2] = 0xdd;
-	disp_buf[3] = 0xfd;
-	disp_buf[4] = 0xdd;
-	disp_buf[5] = 0xfb;
-	disp_buf[6] = 0xff;
-	disp_buf[7] = 0xff;
 	char_pos = -1;
 	scroll_delay = 400;
 }
@@ -89,12 +81,20 @@ void Display::multiplex()
 
 void Display::reset()
 {
-	for (int i = 0; i < 8; i++)
+	for (uint8_t i = 0; i < 8; i++)
 		disp_buf[i] = 0xff;
 	str_pos = 0;
 	char_pos = -1;
 }
 
+void Display::setString(char *new_str)
+{
+	reset();
+	for (uint8_t i = 0; new_str[i] != 0; i++) {
+		string[i] = new_str[i];
+	}
+}
+
 /*
  * Draws a single display column. This function should be called at least once
  * per millisecond.
diff --git a/src/display.h b/src/display.h
index 666648a..f0ea0a4 100644
--- a/src/display.h
+++ b/src/display.h
@@ -11,13 +11,14 @@ class Display {
 		uint8_t disp_buf[8];
 		uint8_t str_pos;
 		int8_t char_pos;
+		char string[128];
 	public:
 		Display();
 		void enable(void);
 		void disable(void);
 		void multiplex(void);
 		void reset(void);
-		char string[128];
+		void setString(char *str);
 };
 
 extern Display display;
diff --git a/src/main.cc b/src/main.cc
index 9558109..aefad1c 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -20,13 +20,7 @@ int main (void)
 	// Enable pull-ups on PC3 and PC7 (button pins)
 	PORTC |= _BV(PC3) | _BV(PC7);
 
-	display.string[0] = 'O';
-	display.string[1] = 'h';
-	display.string[2] = 'a';
-	display.string[3] = 'i';
-	display.string[4] = '!';
-	display.string[5] = ' ';
-	display.string[6] = 0;
+	display.setString("Ohai! ");
 
 	display.enable();
 	modem.enable();
diff --git a/src/system.cc b/src/system.cc
index 6c44a30..5c7b177 100644
--- a/src/system.cc
+++ b/src/system.cc
@@ -12,6 +12,8 @@
 
 System rocket;
 
+char disp_buf[128];
+
 void System::loop()
 {
 	static uint8_t i = 0;
@@ -70,12 +72,12 @@ void System::loop()
 
 	while (modem.buffer_available()) {
 		modem_char = modem.buffer_get();
-		display.string[i++] = modem_char;
+		disp_buf[i++] = modem_char;
 		if (i == 127) {
 			i = 0;
 		} else if (modem_char == 0) {
 			i = 0;
-			display.reset();
+			display.setString(disp_buf);
 		}
 	}
 }
-- 
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