mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
69 lines
3.7 KiB
C
69 lines
3.7 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* _6522.h */
|
|
/* */
|
|
/* Internal include file, do not use directly */
|
|
/* */
|
|
/* */
|
|
/* */
|
|
/* (C) 2004 Stefan Haubenthal <polluks@sdf.lonestar.org> */
|
|
/* */
|
|
/* */
|
|
/* 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 __VIA_H
|
|
#define __VIA_H
|
|
|
|
|
|
|
|
/* Define a structure with the 6522 register offsets.
|
|
** NOTE: The timer registers are not declared as 16 bit registers, because
|
|
** the order in which the two 8 bit halves are written is important, and
|
|
** the compiler doesn't guarantee any order when writing 16 bit values.
|
|
*/
|
|
struct __6522 {
|
|
unsigned char prb; /* Port register B */
|
|
unsigned char pra; /* Port register A */
|
|
unsigned char ddrb; /* Data direction register B */
|
|
unsigned char ddra; /* Data direction register A */
|
|
unsigned char t1_lo; /* Timer 1, low byte */
|
|
unsigned char t1_hi; /* Timer 1, high byte */
|
|
unsigned char t1l_lo; /* Timer 1 latch, low byte */
|
|
unsigned char t1l_hi; /* Timer 1 latch, high byte */
|
|
unsigned char t2_lo; /* Timer 2, low byte */
|
|
unsigned char t2_hi; /* Timer 2, high byte */
|
|
unsigned char sr; /* Shift register */
|
|
unsigned char acr; /* Auxiliary control register */
|
|
unsigned char pcr; /* Peripheral control register */
|
|
unsigned char ifr; /* Interrupt flag register */
|
|
unsigned char ier; /* Interrupt enable register */
|
|
unsigned char pra2; /* Port register A w/o handshake */
|
|
};
|
|
|
|
|
|
|
|
/* End of _6522.h */
|
|
#endif
|
|
|
|
|
|
|