/*****************************************************************************/ /* */ /* _6522.h */ /* */ /* Internal include file, do not use directly */ /* */ /* */ /* */ /* (C) 2004 Stefan Haubenthal */ /* */ /* */ /* 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