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Commit cf382268 authored by Erik Strand's avatar Erik Strand
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Attempt to get songs to play

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midi_test.c
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...@@ -28,7 +28,7 @@ ...@@ -28,7 +28,7 @@
#define clear(port,pin) (port &= (~pin)) // clear port pin #define clear(port,pin) (port &= (~pin)) // clear port pin
#define pin_test(pins,pin) (pins & pin) // test for port pin #define pin_test(pins,pin) (pins & pin) // test for port pin
#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set #define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set
#define bit_delay_time 8.5 // bit delay for 115200 with overhead #define bit_delay_time 8.4 // bit delay for 115200 with overhead
//#define bit_delay_time 31.82 // bit delay for 31250 with overhead //#define bit_delay_time 31.82 // bit delay for 31250 with overhead
#define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay #define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay
#define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay #define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay
...@@ -42,7 +42,11 @@ ...@@ -42,7 +42,11 @@
#define led_pin (1 << PB2) #define led_pin (1 << PB2)
void put_char(volatile unsigned char *port, unsigned char pin, char txchar) { #define note_on 144
#define note_off 128
void put_char(volatile unsigned char *port, unsigned char pin, uint8_t txchar) {
// send character in txchar on port pin // send character in txchar on port pin
// assumes line driver (inverts bits) // assumes line driver (inverts bits)
// //
...@@ -97,9 +101,15 @@ void put_char(volatile unsigned char *port, unsigned char pin, char txchar) { ...@@ -97,9 +101,15 @@ void put_char(volatile unsigned char *port, unsigned char pin, char txchar) {
bit_delay(); bit_delay();
// char delay // char delay
bit_delay(); char_delay();
} }
struct MidiEvent {
uint16_t tick;
uint8_t status;
uint8_t note;
uint8_t velocity;
};
int main(void) { int main(void) {
// Set the clock prescaler to 1. // Set the clock prescaler to 1.
...@@ -116,30 +126,118 @@ int main(void) { ...@@ -116,30 +126,118 @@ int main(void) {
// Configure led_pin as an output. // Configure led_pin as an output.
DDRB |= led_pin; DDRB |= led_pin;
// Blink the LED with ~1.0s half-period. uint16_t current_tick = 0;
// 100 * 200 * 1024 / 20M ~ 2.5s uint16_t max_tick = 960;
int count = 0; uint8_t event_index = 0;
// 120 ticks per quarter note
const struct MidiEvent events[] = {
// Stagefright
/*
{0, note_on, 40, 100},
{60, note_off, 40, 100},
{60, note_on, 40, 100},
{120, note_off, 40, 100},
{120, note_on, 40, 100},
{180, note_off, 40, 100},
{180, note_on, 42, 100},
{240, note_off, 42, 100},
{240, note_on, 43, 100},
{300, note_off, 43, 100},
{300, note_on, 43, 100},
{360, note_off, 43, 100},
{360, note_on, 44, 100},
{420, note_off, 44, 100},
{420, note_on, 44, 100},
{480, note_off, 44, 100},
//{480, note_on, 45, 100},
//{540, note_off, 45, 100},
{540, note_on, 45, 100},
{600, note_off, 45, 100},
{600, note_on, 45, 100},
{660, note_off, 45, 100},
{660, note_on, 47, 100},
{720, note_off, 47, 100},
{720, note_on, 48, 100},
{780, note_off, 48, 100},
{780, note_on, 48, 100},
{840, note_off, 48, 100},
{840, note_on, 51, 100},
{900, note_off, 51, 100},
{900, note_on, 51, 100},
{960, note_off, 51, 100},
*/
// Bb
{0, note_on, 58, 100},
{30, note_on, 62, 100},
{60, note_on, 65, 100},
{90, note_on, 69, 100},
{180, note_off, 69, 100},
{180, note_off, 65, 100},
{180, note_off, 62, 100},
{180, note_off, 58, 100},
{240 + 0, note_on, 58, 100},
{240 + 30, note_on, 61, 100},
{240 + 60, note_on, 64, 100},
{240 + 90, note_on, 67, 100},
{240 + 180, note_off, 67, 100},
{240 + 180, note_off, 64, 100},
{240 + 180, note_off, 61, 100},
{240 + 180, note_off, 58, 100},
{480 + 0, note_on, 60, 100},
{480 + 30, note_on, 64, 100},
{480 + 60, note_on, 65, 100},
{480 + 90, note_on, 69, 100},
{480 + 180, note_off, 69, 100},
{480 + 180, note_off, 65, 100},
{480 + 180, note_off, 64, 100},
{480 + 180, note_off, 60, 100},
{720 + 0, note_on, 60, 100},
{720 + 30, note_on, 63, 100},
{720 + 60, note_on, 65, 100},
{720 + 90, note_on, 69, 100},
{720 + 180, note_off, 69, 100},
{720 + 180, note_off, 65, 100},
{720 + 180, note_off, 63, 100},
{720 + 180, note_off, 60, 100},
// sentinel
{65535, note_off, 50, 100},
};
while (1) { while (1) {
// If it's been 10ms, reset the timer and increment count. if (TCNT0 >= 120) {
if (TCNT0 >= 200) {
TCNT0 = 0; TCNT0 = 0;
++count; ++current_tick;
// When count reaches 100, turn the LED on and send a note on command. while (events[event_index].tick <= current_tick) {
if (count == 100) { put_char(&serial_port, serial_pin_out, events[event_index].status);
PORTB |= led_pin; put_char(&serial_port, serial_pin_out, events[event_index].note);
put_char(&serial_port, serial_pin_out, 144); // note on put_char(&serial_port, serial_pin_out, events[event_index].velocity);
put_char(&serial_port, serial_pin_out, 70); // note (A4) ++event_index;
put_char(&serial_port, serial_pin_out, 100); // velocity
} }
// When count reaches 200, turn the LED off and send a note off command. if (current_tick == max_tick) {
else if (count == 200) { current_tick = 0;
PORTB &= ~led_pin; event_index = 0;
put_char(&serial_port, serial_pin_out, 128); // note off PORTB ^= led_pin;
put_char(&serial_port, serial_pin_out, 70); // note (A4)
put_char(&serial_port, serial_pin_out, 100); // velocity /*
count = 0; while (events[event_index].tick <= current_tick) {
put_char(&serial_port, serial_pin_out, events[event_index].status);
put_char(&serial_port, serial_pin_out, events[event_index].note);
put_char(&serial_port, serial_pin_out, events[event_index].velocity);
++event_index;
}
*/
} }
} }
} }
......
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