Re: [cc65-devel] Keyboard and joystick reading problem

[Marc 'B. R. <ma...@ri...>]

On 16/06/16 06:46, Janne Peräaho wrote:

> I can read the keyboard with kbhit() and cgetc() functions but as soon 
> as I call read_joy() function to read the joystick status, the keyboard 
> reading part stops to work: I receive multiple key presses and wrong 
> characters.
> 
> The read_joy() function returns valid status information, except it 
> doesn't register fire button.

Although the conflict of at least one joystick port with the keyboard
might be normal (as on a C64), there seems to be something wrong with
the driver for the plus4.  The following program shows odd behaviour on
VICE's xplus4:

#include <stdint.h>
#include <conio.h>
#include <joystick.h>

#ifdef __PLUS4__
#define JOY_DRIVER  (plus4_stdjoy_joy)
#endif
#ifdef __C64__
#define JOY_DRIVER  (c64_stdjoy_joy)
#endif

extern void JOY_DRIVER[];


int main(void) {
    uint8_t joystick_count;
    uint8_t i, mask;
    uint8_t joy_state;

    if (joy_install(JOY_DRIVER) != JOY_ERR_OK) {
        return 1;
    }
    joystick_count = joy_count();
    clrscr();
    for (;;) {
        gotoxy(0, 0);
        cprintf("key: ");
        if (kbhit()) {
            cprintf("%3u", cgetc());
        }
        cputs("\r\n");
        for (i = 0; i < joystick_count; ++i) {
            joy_state = joy_read(i);
            cprintf("joy #%u: ", i + 1);
            for (mask = 128; mask; mask >>= 1) {
                cputc((joy_state & mask) ? '1' : '0');
            }
            cputs("\r\n");
        }
    }
}

It shows two joysticks but both react simultaneously with a joystick in
port #1 for the directions and not at all with a joystick in port #2.
Button presses on a joystick aren't recognized at all in both ports.

The same program compiled for C64 works fine on VICE's x64 and a real
bread box.

Ciao,
	Marc 'BlackJack' Rintsch
-- 
Incorrect documentation is often worse than no documentation.
                                            -- Bertrand Meyer