Static message display

src/main.cpp

@@ -0,0 +1,56 @@
+#include <Arduino.h>
+#include <avr/cpufunc.h>
+#include <avr/pgmspace.h>
+
+#include "font.h"
+
+const int width = 120;
+const int lines = 7;
+
+const int line_pins[7] = { 2, 3, 4, 5, 6, 7, 8 };
+
+// Shift register needs to use raw AVR
+// B1 is clock
+// B2 is data
+void shiftout(uint8_t bit)
+{
+	PORTB = bit << 2;
+	PORTB |= 0x02;
+	PORTB = 0;
+}
+
+void setup()
+{
+	for (uint8_t i = 2; i <= 10; i++) {
+		pinMode(i, OUTPUT);
+	}
+	pinMode(13, OUTPUT);
+}
+
+char *message = "Hello world!        ";
+
+void loop()
+{
+	for (uint8_t y = 0; y < lines; y++) {
+		uint8_t letter = 0;
+		uint8_t lettercol = 0;
+		for (uint8_t x = 0; x < width; x++) {
+			if (lettercol == 5) {
+				lettercol = 0;
+				letter++;
+				shiftout(0);
+			} else {
+				uint8_t col = pgm_read_byte_near(&font_5x7_col[message[letter]][lettercol]);
+				uint8_t bit = (col & (1 << y)) ? 1 : 0;
+				shiftout(bit);
+				lettercol++;
+			}
+		}
+
+		digitalWrite(13, 1);
+		digitalWrite(line_pins[y], 1);
+		delayMicroseconds(200);
+		digitalWrite(13, 0);
+		digitalWrite(line_pins[y], 0);
+	}
+}