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Imbus 2023-12-03 13:37:53 +01:00
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51
74C922.c Normal file
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#include "config.h"
#include <avr/io.h>
#include <util/delay.h>
#include <stdbool.h>
// Pin Definitions
#define ENCODER_A_PIN PD6
#define ENCODER_B_PIN PD5
#define ENCODER_C_PIN PD4
#define ENCODER_D_PIN PD3
#define ENCODER_OE_PIN PD2
#define ENCODER_DA_PIN PD1
void prepare_interrupt() {
EICRA |= (1 << ISC00); // Any logical change triggers interrupt
EIMSK |= (1 << INT0); // INT0 external interrupt
PCICR |= (1 << PCIE0);
}
// Encoder Module
void encoder_init() {
// Set A, B, C, D, and DA pins as inputs
DDRD &= ~((1 << ENCODER_A_PIN) | (1 << ENCODER_B_PIN) | (1 << ENCODER_C_PIN) | (1 << ENCODER_D_PIN) | (1 << ENCODER_DA_PIN));
// Set OE as output
DDRD |= (1 << ENCODER_OE_PIN);
// Enable internal pull-up resistors for A, B, C, D, and OE pins
PORTD |= (1 << ENCODER_A_PIN) | (1 << ENCODER_B_PIN) | (1 << ENCODER_C_PIN) | (1 << ENCODER_D_PIN) | (1 << ENCODER_DA_PIN);
}
uint8_t encoder_read() {
uint8_t encoder_data = 0;
// Set OE (Output Enable) pin low to enable the encoder
PORTD &= ~(1 << ENCODER_OE_PIN);
_delay_us(1);
// Read the state of the encoder
encoder_data = PIND >> (ENCODER_A_PIN - 3);
encoder_data &= 0x0F;
// Set OE pin high to disable the encoder
PORTD |= (1 << ENCODER_OE_PIN);
return encoder_data;
}
bool encoder_available() {
return (PIND & (1 << ENCODER_DA_PIN));
}

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74C922.h Normal file
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#ifndef H74C922_H
#define H74C922_H
void encoder_init();
uint8_t encoder_read();
bool encoder_available();
#endif // 74C922_H

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#include "config.h"
#include <avr/io.h>
#include <util/delay.h>
#include <stdbool.h>
#include "GDM1602K.h"
#define DATAPIN PC0
#define PORT PORTC
#define PIN PINC
#define DDR DDRC
bool is_high() {
return (PIN & (1 << DATAPIN));
}
// Function to read data from the DHT22 sensor
int DHT22_Read(int *temperature, int *humidity)
{
// Set the data pin as output
DDR |= (1 << DATAPIN);
PORT |= (1 << DATAPIN); // Set the pin high, if not already pulled up
_delay_ms(100);
// Send start signal
PORT &= ~(1 << DATAPIN); // Set the pin low
_delay_us(500); // Hold it for a while
PORT |= (1 << DATAPIN); // Set the pin high
DDR &= ~(1 << DATAPIN); // Data direction in
_delay_us(20); // Wait for 40 microseconds
// Sensor should have pulled low here
if(PIN & (1 << DATAPIN)) return -2;
_delay_us(80); // Wait for 80 microseconds
// Sensor should have pulled high here
if(!(PIN & (1 << DATAPIN))) return -1;
// Read data from the sensor
uint8_t data[5] = {0, 0, 0, 0, 0};
uint8_t bitMask = 0x80; // All zeroes with MSB high
uint8_t byteIndex = 0;
for (byteIndex = 0; byteIndex < 5; byteIndex++)
{
for (bitMask = 0x80; bitMask != 0; bitMask >>= 1)
{
// Wait for the data bit to go low
while (!(PIN & (1 << PC0)))
;
// Wait for the data bit to go high
_delay_us(20);
if (PIN & (1 << PC0))
data[byteIndex] |= bitMask;
// Wait for the data bit to go low (end of bit)
while (PIN & (1 << PC0))
;
}
}
// Verify checksum
uint8_t checksum = data[0] + data[1] + data[2] + data[3];
if (checksum != data[4])
return -1;
// Extract temperature and humidity
*humidity = ((data[0] << 8) | data[1]);
*temperature = ((data[2] << 8) | data[3]);
return 0;
}

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#ifndef DHT22_H
#define DHT22_H
int DHT22_Read(int *temperature, int *humidity);
void DHT22_Init();
#endif /* DHT22_H */

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GDM1602K.c Normal file
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#include "config.h"
#include <avr/io.h>
#include <util/delay.h>
#include <stdbool.h>
#define LCD_DATA_PORT PORTB
#define LCD_DATA_DDR DDRB
#define LCD_RS_PIN PB1
#define LCD_EN_PIN PB2
#define LCD_DB4 PB3
#define LCD_DB5 PB4
#define LCD_DB6 PB5
#define LCD_DB7 PB6
// Delay constants from the datasheet. These are mostly in nanoseconds
#define LAG 10
#define TW 300
#define TSU1 100
void lcd_4bit_init() {
LCD_DATA_DDR = 0xFF;
LCD_DATA_PORT = (1 << LCD_DB5);
LCD_DATA_PORT &= ~(1 << LCD_RS_PIN);
_delay_us(1);
LCD_DATA_PORT |= (1 << LCD_EN_PIN);
_delay_us(1);
LCD_DATA_PORT &= ~(1 << LCD_EN_PIN);
_delay_us(1);
LCD_DATA_PORT &= ~(1 << LCD_DB5);
_delay_us(1);
}
void lcd_send(bool rs, uint8_t data) {
LCD_DATA_DDR = 0xFF;
LCD_DATA_PORT = 0x00;
LCD_DATA_PORT |= (data >> 4) << 3;
_delay_us(1);
// If rs (actual text data), set RS pin high
if(rs == true) LCD_DATA_PORT |= (1 << LCD_RS_PIN);
// Pulse enable
_delay_ms(2);
LCD_DATA_PORT |= (1 << LCD_EN_PIN);
_delay_us(1);
LCD_DATA_PORT &= ~(1 << LCD_EN_PIN);
//_delay_us(1);
// Clear data pins
LCD_DATA_PORT &= ~(0x0F << 3);
// Mask the lower bits and shift accordingly
LCD_DATA_PORT |= (data & 0x0F) << 3;
_delay_us(1);
// Pulse enable
LCD_DATA_PORT |= (1 << LCD_EN_PIN);
_delay_us(1);
LCD_DATA_PORT &= ~(1 << LCD_EN_PIN);
_delay_us(1);
LCD_DATA_PORT &= ~(0x0F << 3);
LCD_DATA_PORT &= ~(1 << LCD_RS_PIN); // RS Low
}
void lcd_init() {
_delay_ms(100);
lcd_4bit_init();
//lcd_send(1, 0b01111000);
lcd_send(0, 0x01); // Clear screen
lcd_send(0, 0x02); // Return home
lcd_send(0, 0b00001100); // Display on, no cursor
lcd_send(0, 0b00101000);
}
void lcd_clear() {
lcd_send(0, 0x01);
}
void test_leds() {
DDRB |= 0xFF;
PORTB = (1 << LCD_DB4);
_delay_us(1);
PORTB = (1 << LCD_DB5);
_delay_us(1);
PORTB = (1 << LCD_DB6);
_delay_us(1);
PORTB = (1 << LCD_DB7);
_delay_us(1);
PORTB = (1 << LCD_EN_PIN);
_delay_us(1);
PORTB = (1 << LCD_RS_PIN);
_delay_us(1);
PORTB = 0x00;
}
void lcd_set_cursor(uint8_t row, uint8_t col) {
uint8_t position = 0x80;
if (row == 1) position += 0x40;
position += col;
lcd_send(0, position);
}
// Takes a string and splits it over two lines if needed. Max length is 32 characters.
void lcd_write_string(const char* string) {
uint8_t i = 0;
while(string[i]) {
if(i == 16) {
lcd_set_cursor(1, 0);
while(string[i] == ' ') i++; // Skip leading spaces on the new line
}
lcd_send(1, string[i]);
i++;
}
}
// Takes two separate strings and prints them on their corresponding row
void lcd_write_strings(const char* top, const char* bottom) {
uint8_t i = 0;
while (top[i]) {
lcd_send(1, top[i]);
i++;
}
i = 0;
lcd_set_cursor(1, 0);
while(bottom[i]) {
lcd_send(1, bottom[i]);
i++;
}
}

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#ifndef GDM1602K_H_
#define GDM1602K_H_
void lcd_write_strings(const char* top, const char* bottom);
void lcd_write_string(const char* string);
void lcd_init();
void lcd_clear();
#endif /* GDM1602K_H_ */

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#include "config.h"
#include <avr/io.h>
#include <util/delay.h>
#include "LM335.h"
void ADC_Init()
{
// Set AVCC as the voltage reference with external capacitor at AREF pin
ADMUX = (1 << REFS0);
// Set ADC clock prescaler to 64 (125kHz ADC clock)
ADCSRA = (1 << ADPS2) | (1 << ADPS1);
// Enable ADC, enable interrupts
ADCSRA |= (1 << ADEN); // | (1 << ADIE);
}
uint16_t ADC_Read(uint8_t channel)
{
// Select ADC channel
ADMUX = (ADMUX & 0xF8) | (channel & 0x07);
// Start ADC conversion
ADCSRA |= (1 << ADSC);
// Wait for ADC conversion to complete
while (ADCSRA & (1 << ADSC))
;
// Read ADC result
return ADC;
}
float LM335_ReadTemperature()
{
// Read ADC value from LM335 pin (PA0)
uint16_t adcValue = ADC_Read(0x00);
float vref = 4.64;
int vfactor = 100;
float voltage = (adcValue * vref) / 1024;
// Calculate temperature in Celsius using LM335 formula
float temperature = (voltage - 2.92) * vfactor;
return temperature;
}

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#include <avr/io.h>
#include <util/delay.h>
#ifndef LM335_H_
#define LM335_H_
#define LM335_PIN PA0
void ADC_Init();
uint16_t ADC_Read(uint8_t channel);
float LM335_ReadTemperature();
#endif

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config.h Normal file
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#ifndef CONFIG_H
#define CONFIG_H
#define F_CPU 1600000UL
#endif // CONFIG_H

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#include "config.h"
#include <avr/io.h>
#include <stdbool.h>
#include <util/delay.h>
#include <stdio.h>
#include "74C922.h"
#include "DHT22.h"
#include "GDM1602K.h"
#include "LM335.h"
enum DisplayMode {TEMP, AVG};
bool b = false;
int main() {
_delay_ms(1000); // Boot up time, let components catch up
lcd_init();
encoder_init();
lcd_clear();
lcd_write_string("Hello, world!");
int temp, hum;
char celc_str[30];
char temp_with_unit[20] = "";
char hum_str[30];
float celcius = 0.0;
float humidity = 0.0;
char temp_unit = 'C';
uint8_t button_data;
char btn_string[30];
bool btn_just_pressed = false;
long loops = 0;
while(1) {
// If encoder has data available
if(encoder_available() == true) {
loops = 0xFFFF;
if(!btn_just_pressed) {
btn_just_pressed = true;
button_data = encoder_read();
sprintf(btn_string, "Knapp %d", button_data);
lcd_clear();
if(button_data == 11) {
if(temp_unit == 'C') temp_unit = 'F';
else if(temp_unit == 'F') temp_unit = 'K';
else if(temp_unit == 'K') temp_unit = 'C';
loops = 0;
}
if(button_data == 3) {
sprintf(celc_str, "10h Tmp: %s", temp_with_unit);
sprintf(hum_str, "10h Hum: %.1f%%", humidity-1);
lcd_write_strings(celc_str, hum_str);
}
}
} else {
btn_just_pressed = false;
}
if(loops == 0) {
loops = 0x2FFFF;
int result = DHT22_Read(&temp, &hum);
lcd_clear();
if(result == 0) {
celcius = ((float)temp)/10.0;
humidity = ((float) hum)/10.0;
switch(temp_unit) {
case 'C':
sprintf(temp_with_unit, "%.1f %c", celcius, temp_unit);
break;
case 'F':
sprintf(temp_with_unit, "%.1f %c", celcius*9/5+32, temp_unit);
break;
case 'K':
sprintf(temp_with_unit, "%.1f %c", celcius + 273.15, temp_unit);
break;
}
sprintf(celc_str, "Temp: %s", temp_with_unit);
sprintf(hum_str, "Humidity: %.1f%%", humidity);
lcd_write_strings(celc_str, hum_str);
}
}
loops--;
}
lcd_write_string("Exited...");
}