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Adjustments per most feedback on cc65 PR 831

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(I appreciate the feedback!)
This commit is contained in:
Bill Kendrick
2019-01-14 20:47:05 -08:00
parent 5ee3c88017
commit d52af69d69
4 changed files with 32 additions and 29 deletions
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37
include/_pia.h
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@@ -42,6 +42,7 @@
/* Define a structure with the PIA register offsets */
struct __pia {
unsigned char porta; /* port A data r/w */
/* Paddle 0-3 triggers (per PORTA bits) */
#define PORTA_PTRIG3 0x80
#define PORTA_PTRIG2 0x40
@@ -50,34 +51,38 @@ struct __pia {
unsigned char portb; /* port B data r/w */
/* Paddle 4-7 triggers (per PORTB bits); only 400/800 had four controller ports */
#define PORTB_PTRIG7 0x80
#define PORTB_PTRIG6 0x40
#define PORTB_PTRIG5 0x08
#define PORTB_PTRIG4 0x04
/* See also: "JOY_xxx_MASK" in "atari.h" */
/* See also: "JOY_xxx_MASK" in "atari.h" */
unsigned char pactl; /* port A control */
unsigned char pbctl; /* port B control */
#define PxCTL_IRQ_ENABLE 0x01 /* (W) Peripheral A interrupt (IRQ) enable. */
/* One equals enable. Set by the OS but available to the user;
reset on powerup. */
#define PxCTL_BIT1 0x02 /* "Set to zero" */
#define PxCTL_ADDRESSING 0x04 /* (W) Controls PORTA addressing */
/* One equals PORTA register; zero equals direction control register */
#define PACTL_MOTOR_CONTROL 0x08 /* (W) Peripheral motor control line (turn the cassette on
or off; zero equals on) */
#define PxCTL_IRQ_ENABLE 0x01 /* (W) Peripheral A interrupt (IRQ) enable. */
/* One equals enable. Set by the OS but available to the user; reset on powerup. */
#define PxCTL_BIT1 0x02 /* "Set to zero" */
#define PxCTL_ADDRESSING 0x04 /* (W) Controls PORTA addressing */
/* One equals PORTA register; zero equals direction control register */
#define PACTL_MOTOR_CONTROL 0x08 /* (W) Peripheral motor control line */
/* Turn the cassette on or off; zero equals on) */
#define PBCTL_PERIPH_CMD_IDENT 0x08 /* Peripheral command identification (serial bus command) */
#define PxCTL_BIT4 0x10 /* "Set to one" */
#define PxCTL_BIT5 0x20 /* "Set to one" */
#define PxCTL_BIT6 0x40 /* "Set to zero" */
#define PxCTL_IRQ_STATUS 0x80 /* Peripheral interrupt (IRQ) status bit. */
/* Set by Peripherals (PORTA / PORTB). Reset by reading PORTA / PORTB*/
#define PxCTL_BIT4 0x10 /* "Set to one" */
#define PxCTL_BIT5 0x20 /* "Set to one" */
#define PxCTL_BIT6 0x40 /* "Set to zero" */
#define PxCTL_IRQ_STATUS 0x80 /* Peripheral interrupt (IRQ) status bit. */
/* Set by Peripherals (PORTA / PORTB). Reset by reading PORTA / PORTB. */
};
/* End of _pia.h */
#endif