97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/**
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* (C) Copyright Collin J. Doering 2015
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* File: digital_thermometer.c
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* Author: Collin J. Doering <collin.doering@rekahsoft.ca>
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* Date: Oct 28, 2015
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*/
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/*---------.
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| Includes |
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`---------*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/power.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "lcdLib.h"
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#include "ansi_escapes.h"
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void initADC(void) {
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ADMUX |= (1 << REFS0); // reference voltage on AVCC
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ADCSRA |= (1 << ADPS2) | (1 << ADPS1); // ADC prescaler 64
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ADCSRA |= (1 << ADEN); // Enable ADC
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ADCSRA |= (1 << ADATE); // Auto trigger enable
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ADCSRA |= (1 << ADSC); // Start first conversion
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}
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int main(void) {
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clock_prescale_set(clock_div_1); // Use 8Mhz internal oscillator
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initLCD();
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initADC();
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hideCursor();
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writeStringToLCD("Temperature: ");
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saveCursorPosition();
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while (1) {
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float v = ADC * (5000 / 1024);
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int8_t t = (int8_t) ((v - 500) / 10);
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char str[5];
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uint8_t i = 1, sigDig = 0;
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if (t < 0) {
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str[0] = '-';
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t *= -1;
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} else {
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str[0] = '+';
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}
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for (uint8_t j = 100; j >= 1; j /= 10) {
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uint8_t digit = (uint8_t) (t / j);
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if (!sigDig) {
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if (digit != 0) {
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sigDig = 1;
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str[i++] = digit + 0x30;
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} else {
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str[i++] = ' ';
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}
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} else {
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str[i++] = digit + 0x30;
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}
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t = t - digit*j;
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}
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str[i] = '\0';
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writeStringToLCD(str);
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writeCharToLCD(0xdf);
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writeStringToLCD("C");
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restoreCursorPosition();
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_delay_ms(16);
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}
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return 0;
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}
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