119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* Digital read 8bit data from PORTD3..7 PORTD0..1 (Arduino digital ports 3..9)
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* and output it as binary string (10001101) to serial. Floating state is high.
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* Connect pin to ground to set it low.
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*
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* Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds!
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*
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* To compile and upload run: make clean; make; make program;
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*
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* Copyright 2011 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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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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#include <stdlib.h>
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#include <avr/io.h>
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#include <stdio.h>
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#include <util/delay.h>
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#include <stdint.h>
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#include <avr/sfr_defs.h>
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#include "main.h"
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#include "uart.h"
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void init(void) {
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/* Make PORTD2..7 PORTD0..1 (Arduino digital 3..11) input by clearing bits in DDR */
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DDRD &= ~(_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
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DDRB &= ~(_BV(PORTB0) | _BV(PORTB1));
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/* In input mode, when pull-up is enabled, default state of pin becomes ’1′. So even if */
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/* you don’t connect anything to pin and if you try to read it, it will read as 1. Now, */
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/* when you externally drive that pin to zero(i.e. connect to ground / or pull-down), */
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/* only then it will be read as 0. */
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/* Enable pullups by setting bits in PORT. Default state is now high. */
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PORTD |= (_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
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PORTB |= (_BV(PORTB0) | _BV(PORTB1));
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/* Disable pullups by clearing bits in PORT. Default state is now low. */
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/*
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PORTD &= ~(_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
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PORTB &= ~(_BV(PORTB0) | _BV(PORTB1));
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*/
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/* Make PORTB5 (Arduino digital 13) an output by setting bit in DDR. */
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DDRB |= _BV(PORTB5);
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}
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int digital_read(int input_register, int pin) {
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return bit_is_set(input_register, pin) != 0 ? 1 : 0;
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}
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/*
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void digital_write(int input_register, int pin) {
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input_register |= _BV(pin);
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}
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*/
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int main(void) {
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init();
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uart_init();
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stdout = &uart_output;
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stdin = &uart_input;
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int value;
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//char buffer[9];
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while (1) {
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/* Blink led by toggling state of PORTB5 (Arduino digital 13). */
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PORTB ^= _BV(PORTB5);
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/*
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puts("PINB");
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value = PINB;
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itoa(value, buffer, 2);
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puts(buffer);
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*/
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value = digital_read(PIND, PIND2);
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printf("%d", value);
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value = digital_read(PIND, PIND3);
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printf("%d", value);
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value = digital_read(PIND, PIND4);
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printf("%d", value);
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value = digital_read(PIND, PIND5);
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printf("%d", value);
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value = digital_read(PIND, PIND6);
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printf("%d", value);
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value = digital_read(PIND, PIND7);
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printf("%d", value);
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value = digital_read(PINB, PINB0);
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printf("%d", value);
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value = digital_read(PINB, PINB1);
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printf("%d\n", value);
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_delay_ms(500);
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}
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return 0;
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}
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