bless

.clangd

@@ -0,0 +1,8 @@
+CompileFlags:
+  Add:
+    - -I/usr/avr/include
+    - -mmcu=atmega32u4
+    - -DF_CPU=8000000UL
+    - --target=avr
+  Remove:
+    - -m*

Makefile

@@ -0,0 +1,16 @@
+BOARD = adafruit:avr:leonardo
+PORT = /dev/ttyACM0
+
+SRC := main.c
+
+CC = avr-gcc
+
+INCLUDE := /usr/avr
+CFLAGS := -mmcu=atmega32u4 -DF_CPU=8000000UL -I$(INCLUDE)
+
+all:
+	$(CC) $(CFLAGS) -Os $(SRC) -o main.elf
+	avr-objcopy -O ihex main.elf main.hex
+
+upload: all
+	sudo avrdude -p atmega32u4 -c avr109 -P /dev/ttyACM0 -U flash:w:main.hex

main.c

@@ -0,0 +1,93 @@
+#include <stdint.h>
+#define F_CPU 8000000UL // 8 MHz
+
+#include <util/delay.h>
+#include <avr/io.h>
+
+#define SN74_SER (1 << PC6)
+#define SN74_RCLK (1 << PB5)
+#define SN74_SRCLK (1 << PE6)
+
+#define SEG_DIG1 (1 << PF6)
+#define SEG_DIG2 (1 << PF5)
+#define SEG_DIG3 (1 << PF4)
+#define SEG_DIG4 (1 << PF1)
+
+void init_3461BS() {
+    DDRF |= SEG_DIG1 | SEG_DIG2 | SEG_DIG3 | SEG_DIG4;
+
+    PORTF &= ~(SEG_DIG1 | SEG_DIG2 | SEG_DIG3 | SEG_DIG4);
+}
+
+void init_74HC595() {
+    DDRC |= SN74_SER;
+    DDRB |= SN74_RCLK;
+    DDRE |= SN74_SRCLK;
+
+    PORTB &= ~SN74_RCLK;
+    PORTE &= ~SN74_SRCLK;
+}
+
+const uint8_t digit_segments[] = {
+    0b11111110, // 0
+    0b11001111, // 1
+    0b10010010, // 2
+    0b10000110, // 3
+    0b11001100, // 4
+    0b10100100, // 5
+    0b10100000, // 6
+    0b10001101, // 7
+    0b10000000, // 8
+    0b10000100, // 9
+};
+
+void send_serial_byte(uint8_t n) {
+    for (int i = 7; i > 0; i--) {
+        if (n & (1 << i)) {
+            PORTC |= SN74_SER;
+        }
+        else {
+            PORTC &= ~SN74_SER;
+        }
+        PORTE |= SN74_SRCLK;
+        _delay_ms(100);
+        PORTE &= ~SN74_SRCLK;
+        PORTC &= ~SN74_SER;
+        _delay_ms(100);
+    }
+
+    PORTB |= SN74_RCLK;
+    _delay_ms(100);
+    PORTB &= ~SN74_RCLK;
+}
+
+int main() {
+    init_74HC595();
+    init_3461BS();
+
+    while (1) {
+        for (int i = 0; i < 255; i++) {
+            for(int j = 0; j < 100; j++) {
+                PORTF |= SEG_DIG1;
+                send_serial_byte(digit_segments[i / 1000]);
+                _delay_ms(2);
+                PORTF &= ~SEG_DIG1;
+
+                PORTF |= SEG_DIG2;
+                send_serial_byte(digit_segments[(i / 100) % 10]);
+                _delay_ms(2);
+                PORTF &= ~SEG_DIG2;
+
+                PORTF |= SEG_DIG3;
+                send_serial_byte(digit_segments[(i / 10) % 10]);
+                _delay_ms(2);
+                PORTF &= ~SEG_DIG3;
+
+                PORTF |= SEG_DIG4;
+                send_serial_byte(digit_segments[i % 10]);
+                _delay_ms(2);
+                PORTF &= ~SEG_DIG4;
+            }
+        }
+    }
+}

main.hex

@@ -0,0 +1,44 @@
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+:0A029400FECF9286CCA4A08D8084DA
+:00000001FF