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#include "serial_midi.h"
#include <avr/interrupt.h>
#include "stdlib.h"
static MidiDevice midi_device;
void serial_midi_send(MidiDevice * device, uint8_t cnt, uint8_t inByte0, uint8_t inByte1, uint8_t inByte2){
//we always send the first byte
while ( !(UCSRA & _BV(UDRE)) ); // Wait for empty transmit buffer
UDR = inByte0;
//if cnt == 2 or 3 we send the send byte
if(cnt > 1) {
while ( !(UCSRA & _BV(UDRE)) ); // Wait for empty transmit buffer
UDR = inByte1;
}
//if cnt == 3 we send the third byte
if(cnt == 3) {
while ( !(UCSRA & _BV(UDRE)) ); // Wait for empty transmit buffer
UDR = inByte2;
}
}
MidiDevice * serial_midi_device(void) {
return &midi_device;
}
MidiDevice* serial_midi_init(uint16_t clockScale, bool out, bool in){
//send up the device
midi_device_init(&midi_device);
midi_device_set_send_func(&midi_device, serial_midi_send);
// Set baud rate
UBRRH = (uint8_t)(clockScale >> 8);
UBRRL = (uint8_t)(clockScale & 0xFF);
// Enable transmitter
if(out)
UCSRB |= _BV(TXEN);
if(in) {
//Enable receiver
//RX Complete Interrupt Enable (user must provide routine)
UCSRB |= _BV(RXEN) | _BV(RXCIE);
}
//Set frame format: Async, 8data, 1 stop bit, 1 start bit, no parity
//needs to have URSEL set in order to write into this reg
UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);
return serial_midi_device();
}
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