/* mpu_init:
* Initialises the MPU-401 midi interface.
*/
static int mpu_init(int input, int voices)
{
if (!mpu_output_mode) {
/* only do the hardware initialisation once */
outportb(_mpu_port+1, 0x3F);
mpu_input();
LOCK_VARIABLE(midi_mpu401);
LOCK_VARIABLE(_mpu_port);
LOCK_VARIABLE(_mpu_irq);
LOCK_FUNCTION(_mpu_poll);
LOCK_FUNCTION(mpu_output);
LOCK_FUNCTION(mpu_interrupt);
}
if (input) {
/* only hook the interrupt if we have direct access to it */
if (!mpu_piggyback) {
_enable_irq(_mpu_irq);
_install_irq(mpu_int, mpu_interrupt);
}
mpu_input_mode = TRUE;
}
else
mpu_output_mode = TRUE;
return 0;
}
void timer_install ( void (*handl)(void), unsigned int ticksPerSecond )
{
handler = handl ;
_install_irq(0,New08) ;
timer_setup(0,2,ticksPerSecond<18?0:TIMER_CLOCK/ticksPerSecond) ;
}