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69 lines
3.7 KiB
C
69 lines
3.7 KiB
C
/*****************************************************************************/
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/* */
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/* _6522.h */
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/* */
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/* Internal include file, do not use directly */
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/* */
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/* */
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/* */
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/* (C) 2004 Stefan Haubenthal <polluks@sdf.lonestar.org> */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef __VIA_H
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#define __VIA_H
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/* Define a structure with the 6522 register offsets.
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** NOTE: The timer registers are not declared as 16 bit registers, because
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** the order in which the two 8 bit halves are written is important, and
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** the compiler doesn't guarantee any order when writing 16 bit values.
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*/
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struct __6522 {
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unsigned char prb; /* Port register B */
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unsigned char pra; /* Port register A */
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unsigned char ddrb; /* Data direction register B */
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unsigned char ddra; /* Data direction register A */
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unsigned char t1_lo; /* Timer 1, low byte */
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unsigned char t1_hi; /* Timer 1, high byte */
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unsigned char t1l_lo; /* Timer 1 latch, low byte */
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unsigned char t1l_hi; /* Timer 1 latch, high byte */
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unsigned char t2_lo; /* Timer 2, low byte */
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unsigned char t2_hi; /* Timer 2, high byte */
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unsigned char sr; /* Shift register */
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unsigned char acr; /* Auxiliary control register */
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unsigned char pcr; /* Peripheral control register */
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unsigned char ifr; /* Interrupt flag register */
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unsigned char ier; /* Interrupt enable register */
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unsigned char pra2; /* Port register A w/o handshake */
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};
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/* End of _6522.h */
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#endif
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