83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
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* Loops through 0-F and displays it on TIL311. Pure C version.
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*
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* TIL311 pin 3 -> Arduino Digital 2 (PORTD2)
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* TIL311 pin 2 -> Arduino Digital 3 (PORTD3)
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* TIL311 pin 13 -> Arduino Digital 4 (PORTD4)
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* TIL311 pin 12 -> Arduino Digital 5 (PORTD5)
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*
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* Led at Arduino Digital 13 (PORTB5)
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*
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* To compile and upload run: make clean; make; make flash;
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*
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* Copyright 2009 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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*/
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#include <avr/io.h>
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#include <util/delay.h>
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#define BIT_AT(value, bit) (value & (1 << bit))
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int main(void) {
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/* Make PORTB5 (Arduino 13) and PORTD0-PORTD3 (Arduino 2-5) as an output. */
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DDRB |= _BV(PORTB5);
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DDRD |= _BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5);
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for(;;) {
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/* Reset displayed value. */
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int value = 0;
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while (value < 16) {
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/* Toggle led at PORTB5 */
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PORTB ^= _BV(PORTB5);
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/* Short way would be to directly write the value to PORTD. */
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/* Shift by 2 because first TIL311 port is PORTD2. However */
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/* This would zero PORTD0, PORTD1, PORTD6 and PORTD7. */
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/* PORTD = value << 2; */
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/* TIL311 pin 3, latch data input A (1). */
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if (0 == BIT_AT(value, 0)) {
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PORTD &= ~(_BV(PORTD2));
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} else {
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PORTD |= _BV(PORTD2);
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}
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/* TIL311 pin 2, latch data input B (2). */
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if (0 == BIT_AT(value, 1)) {
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PORTD &= ~(_BV(PORTD3));
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} else {
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PORTD |= _BV(PORTD3);
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}
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/* TIL311 pin 13, latch data input C (4). */
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if (0 == BIT_AT(value, 2)) {
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PORTD &= ~(_BV(PORTD4));
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} else {
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PORTD |= _BV(PORTD4);
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}
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/* TIL311 pin 12, latch data input D (8). */
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if (0 == BIT_AT(value, 3)) {
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PORTD &= ~(_BV(PORTD5));
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} else {
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PORTD |= _BV(PORTD5);
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}
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value++;
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_delay_ms(500);
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}
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}
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/* This is never reached. */
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return 0;
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}
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