]> git.sur5r.net Git - cc65/blob - include/_6522.h
Relocate register values outside structs, + more
[cc65] / include / _6522.h
1 /*****************************************************************************/
2 /*                                                                           */
3 /*                                  _6522.h                                  */
4 /*                                                                           */
5 /*                Internal include file, do not use directly                 */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 2004 Stefan Haubenthal <polluks@sdf.lonestar.org>                     */
10 /*                                                                           */
11 /*                                                                           */
12 /* This software is provided 'as-is', without any expressed or implied       */
13 /* warranty.  In no event will the authors be held liable for any damages    */
14 /* arising from the use of this software.                                    */
15 /*                                                                           */
16 /* Permission is granted to anyone to use this software for any purpose,     */
17 /* including commercial applications, and to alter it and redistribute it    */
18 /* freely, subject to the following restrictions:                            */
19 /*                                                                           */
20 /* 1. The origin of this software must not be misrepresented; you must not   */
21 /*    claim that you wrote the original software. If you use this software   */
22 /*    in a product, an acknowledgment in the product documentation would be  */
23 /*    appreciated but is not required.                                       */
24 /* 2. Altered source versions must be plainly marked as such, and must not   */
25 /*    be misrepresented as being the original software.                      */
26 /* 3. This notice may not be removed or altered from any source              */
27 /*    distribution.                                                          */
28 /*                                                                           */
29 /*****************************************************************************/
30
31
32
33 #ifndef __VIA_H
34 #define __VIA_H
35
36
37
38 /* Define a structure with the 6522 register offsets.
39 ** NOTE: The timer registers are not declared as 16 bit registers, because
40 ** the order in which the two 8 bit halves are written is important, and
41 ** the compiler doesn't guarantee any order when writing 16 bit values.
42 */
43 struct __6522 {
44     unsigned char       prb;            /* Port register B */
45     unsigned char       pra;            /* Port register A */
46     unsigned char       ddrb;           /* Data direction register B */
47     unsigned char       ddra;           /* Data direction register A */
48     unsigned char       t1_lo;          /* Timer 1, low byte */
49     unsigned char       t1_hi;          /* Timer 1, high byte */
50     unsigned char       t1l_lo;         /* Timer 1 latch, low byte */
51     unsigned char       t1l_hi;         /* Timer 1 latch, high byte */
52     unsigned char       t2_lo;          /* Timer 2, low byte */
53     unsigned char       t2_hi;          /* Timer 2, high byte */
54     unsigned char       sr;             /* Shift register */
55     unsigned char       acr;            /* Auxiliary control register */
56     unsigned char       pcr;            /* Peripheral control register */
57     unsigned char       ifr;            /* Interrupt flag register */
58     unsigned char       ier;            /* Interrupt enable register */
59     unsigned char       pra2;           /* Port register A w/o handshake */
60 };
61
62
63
64 /* End of _6522.h */
65 #endif
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