Example code how to drive TIL311 led display.

Loops through 0-F and displays it on TIL311. Pure C version. Datasheet can be found at:

http://mouser.com/catalog/specsheets/til311-e4.PDF

til311/firmware/Makefile

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+DEVICE     = atmega328p
+CLOCK      = 16000000L
+BAUD 	   = 57600
+SERIALPORT = /dev/tty.usb*
+PROGRAMMER = arduino
+OBJECTS    = main.o
+#FUSES      = -U hfuse:w:0xd9:m -U lfuse:w:0x24:m
+
+# Tune the lines below only if you know what you are doing:
+AVRDUDE = avrdude -c $(PROGRAMMER) -b $(BAUD) -P $(SERIALPORT) -p $(DEVICE)
+COMPILE = avr-gcc -Wall -Os -DF_CPU=$(CLOCK) -mmcu=$(DEVICE)
+
+# symbolic targets:
+all:	main.hex
+
+.c.o:
+	$(COMPILE) -c $< -o $@
+
+.S.o:
+	$(COMPILE) -x assembler-with-cpp -c $< -o $@
+# "-x assembler-with-cpp" should not be necessary since this is the default
+# file type for the .S (with capital S) extension. However, upper case
+# characters are not always preserved on Windows. To ensure WinAVR
+# compatibility define the file type manually.
+
+.c.s:
+	$(COMPILE) -S $< -o $@
+
+flash:	all
+	$(AVRDUDE) -U flash:w:main.hex:i
+
+fuse:
+	$(AVRDUDE) $(FUSES)
+
+# Xcode uses the Makefile targets "", "clean" and "install"
+install: flash fuse
+
+# if you use a bootloader, change the command below appropriately:
+load: all
+	bootloadHID main.hex
+
+clean:
+	rm -f main.hex main.elf $(OBJECTS)
+
+# file targets:
+main.elf: $(OBJECTS)
+	$(COMPILE) -o main.elf $(OBJECTS)
+
+main.hex: main.elf
+	rm -f main.hex
+	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
+# If you have an EEPROM section, you must also create a hex file for the
+# EEPROM and add it to the "flash" target.
+
+# Targets for code debugging and analysis:
+disasm:	main.elf
+	avr-objdump -d main.elf
+
+cpp:
+	$(COMPILE) -E main.c

til311/firmware/main.c

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+/*
+ * Loops through 0-F and displays it on TIL311. Pure C version.
+ *
+ * TIL311 pin 3  -> Arduino Digital 2 (PORTD2)
+ * TIL311 pin 2  -> Arduino Digital 3 (PORTD3)
+ * TIL311 pin 13 -> Arduino Digital 4 (PORTD4)
+ * TIL311 pin 12 -> Arduino Digital 5 (PORTD5)
+ * 
+ * Led at Arduino Digital 13 (PORTB5)
+ *
+ * To compile and upload run: make clean; make; make flash;
+ *
+ * Copyright 2009 Mika Tuupola
+ *
+ * Licensed under the MIT license:
+ *   http://www.opensource.org/licenses/mit-license.php
+ *
+ */
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define BIT_AT(value, bit) (value & (1 << bit))
+
+int main(void) {
+    
+    /* Make PORTB5 (Arduino 13) and PORTD0-PORTD3 (Arduino 2-5) as an output. */
+    DDRB |= _BV(PORTB5);
+    DDRD |= _BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5);
+    
+    for(;;) {
+
+        /* Reset displayed value. */
+        int value = 0;
+
+        while (value < 16) {
+            /* Toggle led at PORTB5 */
+            PORTB ^= _BV(PORTB5);
+
+            /* TIL311 pin 3, latch data input A (1). */
+            if (0 == BIT_AT(value, 0)) {
+                PORTD &= ~(_BV(PORTD2)); 
+            } else {
+                PORTD |= _BV(PORTD2);
+            }
+
+            /* TIL311 pin 2, latch data input B (2). */
+            if (0 == BIT_AT(value, 1)) {
+                PORTD &= ~(_BV(PORTD3));
+            } else {
+                PORTD |= _BV(PORTD3);
+            }
+
+            /* TIL311 pin 13, latch data input C (4). */
+            if (0 == BIT_AT(value, 2)) {
+                PORTD &= ~(_BV(PORTD4));
+            } else {
+                PORTD |= _BV(PORTD4);
+            }
+
+            /* TIL311 pin 12, latch data input D (8). */
+            if (0 == BIT_AT(value, 3)) {
+                PORTD &= ~(_BV(PORTD5));
+            } else {
+                PORTD |= _BV(PORTD5);
+            }
+            value++;
+            _delay_ms(500);    
+        }
+    }
+    
+    /* This is never reached. */
+    return 0;
+}
+
+