Inital commit

makefile

@@ -0,0 +1,45 @@
+MCU=attiny2313
+F_CPU=8000000
+PROG=usbasp
+
+CC=avr-g++
+OBJCOPY=avr-objcopy
+CFLAGS=-Wall -g -O -mmcu=${MCU} -DF_CPU=${F_CPU} -I. -std=gnu++11 
+
+SRC=$(wildcard src/*.cpp)
+
+default: clean build flash
+
+build:
+	mkdir -p bin
+	${CC} ${CFLAGS} -o bin/main.bin  ${SRC}  -w
+	${CC} ${CFLAGS} -o bin/main.elf ${SRC} -w
+	${OBJCOPY} -j .text -j .data -O ihex bin/main.bin bin/main.hex
+
+flash:
+	avrdude -V -p ${MCU} -c ${PROG} -U flash:w:bin/main.hex
+
+clean:
+	rm -f bin/*
+
+debug: flash avarice
+	avr-gdb -ex "target remote :4242" bin/main.elf
+
+avarice:
+	sleep 1
+	avarice --file bin/main.elf --part ${MCU} --${DEBUGGER} :4242 &
+
+term:
+	screen /dev/ttyUSB0 1000000
+
+eeprom:
+	sh -c "avrdude -p ${MCU} -c ${PROG} -t << END \
+	write eeprom 0 1 2 3 \
+	dump eeprom 0 16 \
+	quit \
+	END"
+
+fuse:
+	avrdude -p ${MCU} -c ${PROG} -U lfuse:w:0xe4:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m 
+lock:
+	avrdude -p ${MCU} -c ${PROG} -U lock:w:0xC0:m

src/main.cpp

@@ -0,0 +1,151 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdio.h>
+
+#define F_CPU 8000000UL // CPU Clock Frequency in Hz
+
+#define BAUD_RATE 9600
+#define BAUD_RATE_DIVISOR ((F_CPU / (16UL * BAUD_RATE)) - 1)
+
+// Define segments for each digit
+#define A (1<<PB5)
+#define B (1<<PB7)
+#define C (1<<PB1)
+#define D (1<<PB3)
+#define E (1<<PB4)
+#define F (1<<PB6)
+#define G (1<<PB0)
+#define DP (1<<PB2)
+
+
+
+// Segment patterns for digits 0 to 9
+const uint8_t numbers[] = {
+    (A | B | C | D | E | F),   // 0
+    (B | C),                   // 1
+    (A | B | G | E | D),       // 2
+    (A | B | C | D | G),       // 3
+    (F | G | B | C),           // 4
+    (A | F | G | C | D),       // 5
+    (A | F | E | D | C | G),   // 6
+    (A | B | C),               // 7
+    (A | B | C | D | E | F | G), // 8
+    (A | B | C | F | G)        // 9
+};
+
+// Array to store digits to be displayed
+volatile uint8_t digits[] = {0, 0, 0, 0, 0, 0};
+
+// Current digit index
+volatile uint8_t currentDigit = 0;
+
+// Function to display a single digit
+void displayDigit(uint8_t digit) {
+    PORTB = numbers[digit];
+}
+
+// Function to turn on a specific digit
+void turnOnDigit(uint8_t digit) {
+    switch (digit) {
+        case 0:
+            PORTA |= (1<<PA1);
+            break;
+        case 1:
+            PORTA |= (1<<PA0);
+            break;
+        case 2:
+            PORTD |= (1<<PD2);
+            break;
+        case 3:
+            PORTD |= (1<<PD3);
+            break;
+        case 4:
+            PORTD |= (1<<PD4);
+            break;
+        case 5:
+            PORTD |= (1<<PD5);
+            break;
+        default:
+            break;
+    }
+}
+
+// Function to turn off all digits
+void turnOffAllDigits() {
+    PORTA &= ~((1<<PA1) | (1<<PA0));
+    PORTD &= ~((1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5));
+}
+
+// Timer/Counter1 Compare Match A interrupt
+ISR(TIMER1_COMPA_vect) {
+    turnOffAllDigits(); // Turn off all digits
+    displayDigit(digits[currentDigit]); // Display the current digit
+    turnOnDigit(currentDigit); // Turn on the corresponding digit
+    currentDigit = (currentDigit + 1) % 6; // Move to the next digit
+}
+
+// USART RX Complete interrupt
+ISR(USART_RXC_vect) {
+    static uint8_t d = 0;
+    uint8_t data = UDR; // Read the received data
+
+    if(data == 'X') {
+        d = 0; // Reset currentDigit to start receiving digits
+    } else if (data >= 0 && data <= 9 && currentDigit < 6) {
+        digits[d] = data;
+        d++;
+    }
+    // Echo back the received data
+    while (!(UCSRA & (1 << UDRE))); // Wait for the transmit buffer to be empty
+    UDR = data; // Send the received data back
+}
+
+int uart_putchar(char c, FILE *stream) {
+    if (c == '\n') {
+        uart_putchar('\r', stream);
+    }
+    // Wait for empty transmit buffer
+    while (!(UCSRA & (1 << UDRE)));
+    // Put data into buffer, sends the data
+    UDR = c;
+    return 0;
+}
+
+
+int main() {
+    // Set PORTB as output for segments
+    DDRB = 0xFF;
+    // Set PORTA and PORTD as output for digit control
+    DDRA |= (1<<PA0) | (1<<PA1);
+    DDRD |= (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5);
+
+    // Initialize Timer/Counter1 in CTC mode
+    TCCR1B |= (1 << WGM12);
+    // Set prescaler to 1024
+    TCCR1B |= (1 << CS12) | (0 << CS11) | (1 << CS10);
+    // Set compare value for 1ms interrupt at 8MHz CPU clock
+    OCR1A = 7;
+    // Enable Timer/Counter1 Compare Match A interrupt
+    TIMSK |= (1 << OCIE1A);
+
+    // Initialize USART
+    // Set baud rate to 9600
+    UBRRH = (BAUD_RATE_DIVISOR >> 8);
+    UBRRL = BAUD_RATE_DIVISOR;
+    // Enable receiver and RX complete interrupt
+    UCSRB |= (1<<TXEN) | (1 << RXEN) | (1 << RXCIE);
+    // Set frame format: 8 data bits, 1 stop bit
+    UCSRC = (1 << UCSZ1) | (1 << UCSZ0);
+    // Enable global interrupts
+    sei();
+
+    
+    static FILE mystdout;
+    fdev_setup_stream(&mystdout, uart_putchar, NULL, _FDEV_SETUP_WRITE);
+    stdout = &mystdout;
+    printf("Started");
+    while (1) {
+    }
+
+    return 0;
+}