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Relocate register values outside structs, + more

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Relocated register #define'd values outside of the structs,
improved comment format, expanded & corrected some things.

h/t Trevin Beattie (https://user.xmission.com/~trevin/) for the PIA
register descriptions.
This commit is contained in:
Bill Kendrick
2019-01-15 01:24:12 -08:00
parent d52af69d69
commit 4b61c54092
5 changed files with 385 additions and 163 deletions
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263
include/_pokey.h
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@@ -14,7 +14,7 @@
/* */
/* */
/* (C) 2000 Freddy Offenga <taf_offenga@yahoo.com> */
/* 2019-01-13: Bill Kendrick <nbs@sonic.net>: More defines for registers */
/* 2019-01-14: Bill Kendrick <nbs@sonic.net>: More defines for registers */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
@@ -53,11 +53,30 @@ struct __pokey_write {
unsigned char audc3; /* audio channel #3 control */
unsigned char audf4; /* audio channel #4 frequency */
unsigned char audc4; /* audio channel #4 control */
unsigned char audctl; /* audio control */
unsigned char stimer; /* start pokey timers */
/* 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 */
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 */
unsigned char skctl; /* serial port control */
};
/* AUDC1-4 register values */
/* Meaningful values for the distortion bits.
** 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
@@ -65,10 +84,14 @@ struct __pokey_write {
#define AUDC_POLYS_NONE 0xA0 /* Same as 0xE0 */
#define AUDC_POLYS_4 0xC0
/* When set, the volume value in AUDC1-4 bits 0-3 is sent directly to the speaker;
** it is not modulated with the frequency specified in the AUDF1-4 registers.
** (See "De Re Atari" Chapter 7: Sound)
*/
#define AUDC_VOLUME_ONLY 0x10
unsigned char audctl; /* audio control */
/* AUDCTL register values */
#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 */
@@ -79,17 +102,9 @@ struct __pokey_write {
#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" */
/* IRQEN register values */
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 */
@@ -100,21 +115,46 @@ struct __pokey_write {
#define IRQEN_BREAK_KEY 0x80 /* The BREAK key is enabled */
unsigned char skctl; /* serial port control */
/* SKCTL register values */
#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 */
/* 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 /* POKEY two-tone mode */
/* Serial output is transmitted as a two-tone signal rather than a logic true/false. */
/* Bits 4, 5, and 6 of SKCTL set Serial Mode Control: */
#define SKCTL_SER_MODE_TX_EXT_RX_EXT 0x00
/* Trans. & Receive rates set by external clock; Also internal clock phase reset to zero. */
#define SKCTL_SER_MODE_TX_EXT_RX_ASYNC 0x10
/* Trans. rate set by external clock; Receive asynch. (ch. 4) (CH3 and CH4). */
#define SKCTL_SER_MODE_TX_CH4_RX_CH4_BIDIR 0x20
/* Trans. & Receive rates set by Chan. 4; Chan. 4 output on Bi-Direct. clock line. */
/* N.B.: Bit combination 0,1,1 not useful */
#define SKCTL_SER_MODE_TX_CH4_RX_EXT 0x40
/* Trans. rate set by Chan. 4; Receive rate set by external clock. */
/* N.B.: Bit combination 1,0,1 not useful */
#define SKCTL_SER_MODE_TX_CH2_RX_CH4_BIDIR 0x60
/* Trans. rate set by Chan. 2; Receive rate set by Chan. 4; Chan. 4 out on Bi-Direct. clock line. */
#define SKCTL_SER_MODE_TX_CH4_RX_ASYNC 0x70
/* Trans. rate set by Chan. 2; Receive asynch. (chan 3 & 4); Bi-Direct. clock not used (tri-state condition). */
#define SKCTL_FORCE_BREAK 0x80 /* Force break (serial output to zero) */
};
/* Define a structure with the POKEY register offsets for read (R) */
@@ -134,8 +174,11 @@ struct __pokey_read {
unsigned char unuse3; /* unused */
unsigned char serin; /* serial port input */
unsigned char irqst; /* interrupt request status */
unsigned char skstat; /* serial port status */
};
/* SKSTAT register values */
#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 */
@@ -143,88 +186,122 @@ struct __pokey_read {
#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) */
/* KBCODE internal keyboard codes for Atari 8-bit computers*/
#define KEYCODE_NONE 255 /* 255 = no key pressed (but is also same as Ctrl+Shift+A) */
/* 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.
** (Source: "Compute!'s Thrid Book of Atari", "Reading the Keyboard Codes")
*/
#define KEYCODE_NONE 255 /* No key pressed (but also Ctrl+Shift+A) */
/* Special keys: */
/* N.B. Reset key not handled like other keys */
/* N.B. Select, Start, and Option console keys not handled like other keys;
** see CONSOL register in GTIA
*/
/* Fn (function) keys only available on 1200XL */
#define KEYCODE_F1 3
#define KEYCODE_F2 4
#define KEYCODE_F3 19
#define KEYCODE_F4 20
#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_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
/* N.B. Break key not handled like other keys */
#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 */
/* Keyboard top row */
#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_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_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) */
/* Keyboard second row */
#define KEYCODE_SPACE 33
#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
/* Keyboard third row */
#define KEYCODE_CTRL 128 /* binary OR'd */
/* N.B. Cannot read Ctrl key alone */
#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_SEMICOLON 2
#define KEYCODE_PLUS 6
#define KEYCODE_ASTERISK 7
#define KEYCODE_CAPS 60
/* Keyboard bottom row */
#define KEYCODE_SHIFT 64 /* binary OR'd */
/* N.B. Cannot read Shift key alone via KBCODE;
** instead, check "Shfit key press" bit of SKSTAT register
*/
#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) */
/* N.B. No way to tell left from right Shift keys */
/* Keyboard Space key */
#define KEYCODE_SPACE 33
/* End of _pokey.h */
#endif /* #ifndef __POKEY_H */