50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
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// Pi1541 - A Commodore 1541 disk drive emulator
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// Copyright(C) 2018 Stephen White
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//
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// This file is part of Pi1541.
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//
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// Pi1541 is free software : you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Pi1541 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Pi1541. If not, see <http://www.gnu.org/licenses/>.
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#ifndef IOPort_H
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#define IOPort_H
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#include <assert.h>
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typedef void(*PortOutFn)(void*, unsigned char status);
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class IOPort
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{
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public:
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IOPort() : stateOut(0), stateIn(0), direction(0), portOutFn(0) {}
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inline void SetInput(unsigned char pin, bool state)
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{
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if (state) stateIn |= pin;
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else stateIn &= ~pin;
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}
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inline unsigned char GetInput() { return stateIn; }
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inline void SetInput(unsigned char value) { stateIn = value; }
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inline unsigned char GetOutput() { return stateOut; }
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inline void SetOutput(unsigned char value) { stateOut = value; if (portOutFn) (portOutFn)(portOutFnThis, stateOut & direction); }
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inline unsigned char GetDirection() { return direction; }
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inline void SetDirection(unsigned char value) { direction = value; if (portOutFn) (portOutFn)(portOutFnThis, stateOut & direction); }
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inline void SetPortOut(void* data, PortOutFn fn) { portOutFnThis = data; portOutFn = fn; }
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private:
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unsigned char stateOut;
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unsigned char stateIn;
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unsigned char direction;
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PortOutFn portOutFn;
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void* portOutFnThis;
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};
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#endif
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