2 files changed, 90 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9eba3af
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+CC      = avr-gcc
+CFLAGS  = -O2 -Wall -Wextra -Werror -mmcu=atmega328p
+OBJCOPY = avr-objcopy
+
+all:
+        ${CC} ${CFLAGS} main.c
+        ${OBJCOPY} -j .text -j .data -O ihex a.out main.hex
+        rm -f a.out
+
+flash: all
+        avrdude -p atmega328p -c arduino -P /dev/ttyACM0 -b 115200 -U flash:w:main.hex:i
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..9f99ce1
--- /dev/null
+++ b/main.c
@@ -0,0 +1,79 @@
+/*
+ *  EEL4746C - AVR Piano - Speaker Section
+ *  speaker is connected to PD2 and ground
+ *  buttons are connected to PB0-5, PC0-5, PD3-7
+ *  the LCD Arduino UNO is connected to TX/RX (PD0/1)
+ */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#define F_CPU   16000000UL
+#include <util/delay.h>
+
+#define P_RX    0
+#define P_TX    1
+#define P_SPKR  2
+
+unsigned short freqs[] = {
+        100,
+        200,
+        250,
+        300,
+        350,
+        400,
+        500,
+        600,
+        700,
+        750,
+        1000,
+        1250,
+        1500,
+        1750,
+        2000,
+        3000,
+        4000,
+        5000,
+        6000,
+        7000,
+        8000
+};
+unsigned char note = 0;
+unsigned char buttonpressed = 1;
+
+int
+main(void)
+{
+        DDRB = 0x00;
+        DDRC = 0x00;
+        DDRD = (1 << P_TX) | (1 << P_SPKR);
+
+        PCMSK0 = 0xFF;
+        PCMSK1 = 0xFF;
+        PCMSK2 = ~(1 | (1 << 1) | (1 << 2));
+        PCICR = (1 << PCIE0) | (1 << PCIE1) | (1 << PCIE2);
+
+        sei();
+
+        //for (;;);
+        for (unsigned char n = 0;; n = (n + 1) % 2) {
+                if (!buttonpressed) continue;
+                _delay_us(71.43);
+                PORTD ^= 1 << P_SPKR;
+        }
+}
+
+ISR (PCINT0_vect)
+{
+
+}
+
+ISR (PCINT1_vect)
+{
+
+}
+
+ISR (PCINT2_vect)
+{
+
+}