/*
* Keyboard interrupt callback
*/
static int keyboard_handler(struct regs *r) {
unsigned char scancode;
keyboard_wait();
scancode = inportb(KEY_DEVICE);
irq_ack(KEY_IRQ);
write_fs(keyboard_pipe, 0, 1, (uint8_t []){scancode});
return 1;
}
char getch()
{
unsigned int code,c;
do
{
keyboard_wait();
c=deq(&_q,&code);
}
while (c==-1);
return ((char)code);
};
unsigned int getchw()
{
unsigned int code,c;
do
{
keyboard_wait();
c=deq(&_q,&code);
}
while (c==-1);
if (current_process->accesslevel==ACCESS_USER)
return code;
};
/*---------------------------------------------------------
Function: input_wait
Description:
Wait until all enabled input devices have been released.
---------------------------------------------------------*/
void input_wait(void)
{
if (keyboard) keyboard_wait();
if (mouse) mouse_wait();
if (joypad) joypad_wait();
}
/**
* Entry point
*/
int main(void) {
/* Misc variables */
DCPU_registers reg; // CPU registers states (at boot)
/* Hardware initialisation */
cli();
led_setup();
spi_setup(SPI_PRESCALER, SPI_MODE, SPI_BITS_ORDER);
uart_setup(UART_BAUDRATE);
DEBUG_STR("Main init", "UART ready");
button_setup();
buzzer_setup(BUZZER_FREQUENCY, BUZZER_DURATION);
ram_setup();
rom_setup();
microvga_setup();
microvga_enable();
dcpu_register_init(®);
DEBUG_STR("Main init", "done");
sei();
/* MicroVGA initialisation */
_delay_ms(1000); // MicroVGA boot time
microvga_clear_screen(); // Clear screen and goto (0, 0)
microvga_goto_cursor(0, 0);
uart_puts_PSTR(PSTR("SkyWodd DCPU-16 hardware emulator")); // Screen test
buzzer_beep();
DEBUG_STR("Main init", "MicroVGA ready");
/* Hardware self-test */
DEBUG_STR("Main init", "self-test run");
led_run_write(1); // Led test
_delay_ms(250);
led_run_write(0);
led_cpu_write(1);
_delay_ms(250);
led_cpu_write(0);
led_rom_write(1);
_delay_ms(250);
led_rom_write(0);
led_ram_write(1);
_delay_ms(250);
led_ram_write(0);
DEBUG_STR("Main init", "self-test done");
/* Keyboard & MicroVGA api test */
DEBUG_STR("Main init", "waiting for keypress");
microvga_goto_cursor(0, 1);
uart_puts_PSTR(PSTR("Press any key to boot ..."));
keyboard_wait();
uart_puts_PSTR(PSTR("Loading please wait ..."));
dcpu_setup(reg);
buzzer_beep();
microvga_clear_screen();
microvga_goto_cursor(0, 0);
DEBUG_STR("Main init", "ready to run");
/* Infinite loop */
for(;;) {
/* Handle pause */
while(!button_get_state());
#ifdef SERIAL_DEBUG_SUPPORT
/* Debug */
dcpu_registers_dump();
#endif
/* Fetch opcode from ROM */
dcpu_step();
}
}