I mean there is no any keyboard connect to the PC.From PIC I send keyboard commands from UART.
// Buffer allocation
int tx_chan;
int buf[64];
int bufin;
int bufout;
int bufcount;
// Device setup, using CCS C compiler:
#include <18f452.h>
#device ADC=10
//#device icd=true
// HS = Normal xtal, H4 = pll * 4...
#fuses H4, NOWDT
#use delay(clock = 40000000)
#use rs232(BAUD = 31250, XMIT = PIN_C6, RCV = PIN_C7)
// Initialisation
void clearall(void)
{
bufin = 0;
bufout = 0;
bufcount = 0;
tx_chan = 10; // Channel 10 is MIDI percussion
}
// Routine to add a character/byte to the buffer
void putbuf(int i)
{
buf[bufin++] = i;
bufcount++;
bufin &= 0x3f;
}
// MIDI keypress function:
// n is note number, v is velocity
void keydown(int n, int v)
{
if(bufcount < 61)
{
putbuf(0x90+tx_chan);
putbuf(n & 0x7f);
putbuf(v & 0x7f);
}
}
// Routine to send "all off" command
void all_off(void)
{
putbuf(0xb0 + tx_chan);
putbuf(0x7b);
putbuf(0);
}
// Buffer transmit routine - call continuously from the program main loop
void sendata(void)
{
if(bufin == bufout)
{
bufcount = 0;
return;
}
if(tx_ready())
{
putchar(buf[bufout++]);
bufout &= 0x3f;
bufcount--;
}
}
// Function to chek if UART TX ruffer is empty & ready for a new character
// For PIC18f452 - adjust as required, or your compiler may have a busy/ready fucntion.
int tx_ready(void)
{
#bit pir1_txif=0xf9e.4;
#asm
movlw 1
movwf _return_
btfss pir1_txif
clrf _return_
nop
#endasm
}
Gotcha!
Hardware wise, yes, just a serial port with a simple current loop interface; but no present music software will see a normal COM port as a MIDI interface.
) only had 8 bit audio, but it gave absolutely stunning 8 bit stereo sound. Even more impressive as way back then all a PC could do was make a 'beep'.
