cc65/include/_pokey.h

/*****************************************************************************/
/*                                                                           */
/*                                 _pokey.h                                  */
/*                                                                           */
/*                Internal include file, do not use directly                 */
/*                                                                           */
/* POKEY, Pot Keyboard Integrated Circuit, is a digital I/O chip designed    */
/* for the Atari 8-bit family of home computers; it combines functions for   */
/* sampling (ADC) potentiometers (such as game paddles) and scan matrices of */
/* switches (such as a computer keyboard) as well as sound generation.       */
/* It produces four voices of distinctive square wave sound, either as clear */
/* tones or modified with a number of distortion settings. - Wikipedia       */
/* "POKEY" article.                                                          */
/*                                                                           */
/*                                                                           */
/* (C) 2000 Freddy Offenga <taf_offenga@yahoo.com>                           */
/* 2019-01-13: Bill Kendrick <nbs@sonic.net>: More defines for registers     */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
/*                                                                           */
/*****************************************************************************/



#ifndef __POKEY_H
#define __POKEY_H



/* Define a structure with the POKEY register offsets for write (W) */
struct __pokey_write {
    unsigned char   audf1;  /* audio channel #1 frequency */
    unsigned char   audc1;  /* audio channel #1 control */
    unsigned char   audf2;  /* audio channel #2 frequency */
    unsigned char   audc2;  /* audio channel #2 control */
    unsigned char   audf3;  /* audio channel #3 frequency */
    unsigned char   audc3;  /* audio channel #3 control */
    unsigned char   audf4;  /* audio channel #4 frequency */
    unsigned char   audc4;  /* audio channel #4 control */

/* The values for the distortion bits (AUDCx) are as follows;
   the first process is to divide the clock value by the frequency,
   then mask the output using the polys in the order below;
   finally, the result is divided by two */
#define AUDC_POLYS_5_17  0x00
#define AUDC_POLYS_5     0x20 /* Same as 0x60 */
#define AUDC_POLYS_5_4   0x40
#define AUDC_POLYS_17    0x80
#define AUDC_POLYS_NONE  0xA0 /* Same as 0xE0 */
#define AUDC_POLYS_4     0xC0

#define AUDC_VOLUME_ONLY 0x10


    unsigned char   audctl; /* audio control */

#define AUDCTL_CLOCKBASE_15HZ 0x01 /* Switch main clock base from 64 KHz to 15 KHz */
#define AUDCTL_HIGHPASS_CHAN2 0x02 /* Insert high pass filter into channel two, clocked by channel four */
#define AUDCTL_HIGHPASS_CHAN1 0x04 /* Insert high pass filter into channel one, clocked by channel two */
#define AUDCTL_JOIN_CHAN34    0x08 /* Join channels four and three (16 bit) */
#define AUDCTL_JOIN_CHAN12    0x10 /* Join channels two and one (16 bit) */
#define AUDCTL_CLOCK_CHAN3_179MHZ 0x20 /* Clock channel three with 1.79 MHz */
#define AUDCTL_CLOCK_CHAN1_179MHZ 0x40 /* Clock channel one with 1.79 MHz */
#define AUDCTL_9BIT_POLY      0x80 /* Makes the 17 bit poly counter into nine bit poly (see also: RANDOM) */

    unsigned char   stimer; /* start pokey timers */

    unsigned char   skrest; /* reset serial port status reg.;
      Reset BITs 5 - 7 of the serial port status register (SKCTL) to "1" */

    unsigned char   potgo;  /* start paddle scan sequence (see "ALLPOT") */
    unsigned char   unuse1; /* unused */
    unsigned char   serout; /* serial port data output */

    unsigned char   irqen;  /* interrupt request enable */
#define POKMSK *(unsigned char *) 0x10 /* POKEY interrupts: the IRQ service uses and alters this location */
#define IRQEN_TIMER_1                  0x01 /* The POKEY timer one interrupt is enabled */
#define IRQEN_TIMER_2                  0x02 /* The POKEY timer two interrupt is enabled */
#define IRQEN_TIMER_4                  0x04 /* The POKEY timer four interrupt is enabled */
#define IRQEN_SERIAL_TRANS_FINISHED    0x08 /* The serial out transmission finished interrupt is enabled */
#define IRQEN_SERIAL_OUT_DATA_REQUIRED 0x10 /* The serial output data required interrupt is enabled */
#define IRQEN_SERIAL_IN_DATA_READY     0x20 /* The serial input data ready interrupt is enabled. */
#define IRQEN_OTHER_KEY                0x40 /* The "other key" interrupt is enabled */
#define IRQEN_BREAK_KEY                0x80 /* The BREAK key is enabled */


    unsigned char   skctl;  /* serial port control */

#define SKCTL_KEYBOARD_DEBOUNCE 0x01 /* Enable keyboard debounce circuits */
#define SKCTL_KEYBOARD_SCANNING 0x02 /* Enable keyboard scanning circuit */
#define SKCTL_FAST_POT_SCAN     0x04 /* Fast pot scan */
/* the pot scan counter completes its sequence in two TV line times instead of 
   one frame time (228 scan lines). Not as accurate as the normal pot scan */
#define SKCTL_TWO_TONE_MODE     0x08 /* Serial output is transmitted as a two-tone 
signal rather than a logic true/false. POKEY two-tone mode. */
/* Serial port mode control used to set the bi-directional clock lines */
#define SKCTL_BIT4              0x10 /* FIXME; more meaningful name */
#define SKCTL_BIT5              0x20 /* FIXME; more meaningful name */
#define SKCTL_BIT6              0x40 /* FIXME; more meaningful name */
#define SKCTL_FORCE_BREAK       0x80 /* Force break (serial output to zero) */
};


/* Define a structure with the POKEY register offsets for read (R) */
struct __pokey_read {
    unsigned char   pot0;   /* paddle 0 value */
    unsigned char   pot1;   /* paddle 1 value */
    unsigned char   pot2;   /* paddle 2 value */
    unsigned char   pot3;   /* paddle 3 value */
    unsigned char   pot4;   /* paddle 4 value */
    unsigned char   pot5;   /* paddle 5 value */
    unsigned char   pot6;   /* paddle 6 value */
    unsigned char   pot7;   /* paddle 7 value */
    unsigned char   allpot; /* eight paddle port status (see "POTGO") */
    unsigned char   kbcode; /* keyboard code */
    unsigned char   random; /* random number generator */
    unsigned char   unuse2; /* unused */
    unsigned char   unuse3; /* unused */
    unsigned char   serin;  /* serial port input */
    unsigned char   irqst;  /* interrupt request status */

    unsigned char   skstat; /* serial port status */
#define SKSTAT_SERIN_SHIFTREG_BUSY         0x02 /* Serial input shift register busy */
#define SKSTAT_LASTKEY_PRESSED             0x04 /* the last key is still pressed */
#define SKSTAT_SHIFTKEY_PRESSED            0x08 /* the [Shift] key is pressed */
#define SKSTAT_DATA_READ_INGORING_SHIFTREG 0x10 /* Data can be read directly from the serial input port, ignoring the shift register. */
#define SKSTAT_KEYBOARD_OVERRUN            0x20 /* Keyboard over-run; Reset BITs 7, 6 and 5 (latches) to 1, using SKREST */
#define SKSTAT_INPUT_OVERRUN               0x40 /* Serial data input over-run. Reset latches as above. */
#define SKSTAT_INPUT_FRAMEERROR            0x80 /* Serial data input frame error caused by missing or extra bits. Reset latches as above. */          
};


/* Internal keyboard codes from http://www.atariarchives.org/c3ba/page004.php */
/* (Defined below in the order the keys appear on a 1200XL keyboard, from top left to bottom right) */
/* (Note: Numerous Shift+Ctrl+key combos are unavailable) */

#define KEYCODE_NONE 255 /* 255 = no key pressed (but is also same as Ctrl+Shift+A) */

/* Fn (function) keys only available on 1200XL */
#define KEYCODE_F1 3
#define KEYCODE_F2 4
#define KEYCODE_F3 19
#define KEYCODE_F4 20

/* HELP key only available on XL/XE series */
#define KEYCODE_HELP 17

#define KEYCODE_ESC 28
#define KEYCODE_1 31
#define KEYCODE_2 30
#define KEYCODE_3 26
#define KEYCODE_4 24
#define KEYCODE_5 29
#define KEYCODE_6 27
#define KEYCODE_7 51
#define KEYCODE_8 53
#define KEYCODE_9 48
#define KEYCODE_0 50
#define KEYCODE_LT 54
#define KEYCODE_GT 55
#define KEYCODE_BKSPC 52

#define KEYCODE_TAB 44
#define KEYCODE_Q 47
#define KEYCODE_W 46
#define KEYCODE_E 42
#define KEYCODE_R 40
#define KEYCODE_T 45
#define KEYCODE_Y 43
#define KEYCODE_U 11
#define KEYCODE_I 13
#define KEYCODE_O 8
#define KEYCODE_P 10
#define KEYCODE_MINUS 14
#define KEYCODE_EQUALS 15
#define KEYCODE_RETURN 12

#define KEYCODE_CTRL 128 /* binary OR'd */

#define KEYCODE_A 63
#define KEYCODE_S 62
#define KEYCODE_D 58
#define KEYCODE_F 56
#define KEYCODE_G 61
#define KEYCODE_H 57
#define KEYCODE_J 1
#define KEYCODE_K 5
#define KEYCODE_L 0
#define KEYCODE_; 2
#define KEYCODE_PLUS 6
#define KEYCODE_ASTERISK 7
#define KEYCODE_CAPS 60

#define KEYCODE_SHIFT 64 /* binary OR'd */

#define KEYCODE_Z 23
#define KEYCODE_X 22
#define KEYCODE_C 18
#define KEYCODE_V 16
#define KEYCODE_B 21
#define KEYCODE_N 35
#define KEYCODE_M 37
#define KEYCODE_COMMA 32
#define KEYCODE_PERIOD 34
#define KEYCODE_SLASH 38
#define KEYCODE_FUJI 39 /* (as seen on 400/800) */
#define KEYCODE_INVERSE 39 /* (alternative name; as seen on XL/XE) */

#define KEYCODE_SPACE 33


/* End of _pokey.h */
#endif /* #ifndef __POKEY_H */