62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
//
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// Author: Jeremy Rand
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// Date: July 20, 2012
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//
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// This is the interface for the Curta emulator model.
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//
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#include <stdint.h>
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#include <stdbool.h>
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#ifndef _CURTAMODEL_H
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#define _CURTAMODEL_H
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#define NUM_OPERAND_DIGITS 11
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#define NUM_RESULT_DIGITS 15
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#define NUM_COUNTER_DIGITS 8
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typedef int8_t tDigit;
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typedef int8_t tDigitPos;
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extern tDigit operand[NUM_OPERAND_DIGITS];
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extern tDigit result[NUM_RESULT_DIGITS];
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extern tDigit counter[NUM_COUNTER_DIGITS];
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#define IS_VALID_OPERAND_POS(pos) (((pos) >= 0) && ((pos) < NUM_OPERAND_DIGITS))
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#define IS_VALID_RESULT_POS(pos) (((pos) >= 0) && ((pos) < NUM_RESULT_DIGITS))
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#define IS_VALID_COUNTER_POS(pos) (((pos) >= 0) && ((pos) < NUM_COUNTER_DIGITS))
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#define GET_OPERAND_DIGIT(pos) (operand[(pos)])
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#define GET_RESULT_DIGIT(pos) (result[(pos)])
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#define GET_COUNTER_DIGIT(pos) (counter[(pos)])
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// Ranges from 0 to 8
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#define BASE_POS_MIN 0
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#define BASE_POS_MAX 8
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extern tDigitPos basePos;
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#define IS_VALID_BASE_POS(pos) (((pos) >= BASE_POS_MIN) && ((pos) < BASE_POS_MAX))
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extern tDigitPos selectedOperand;
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#define IS_SELECTED_OPERAND(pos) ((pos) == selectedOperand)
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typedef void (*tOperandDigitChange)(tDigitPos pos, tDigit oldValue, tDigit newValue);
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typedef void (*tSelectedOperandChange)(tDigitPos pos);
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extern void clearDevice(void);
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extern void initDevice(tOperandDigitChange callback1, tSelectedOperandChange callback2);
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extern void incOperandPos(tDigitPos pos);
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extern void decOperandPos(tDigitPos pos);
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extern void shiftOperandPos(bool left);
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extern void shiftResultPos(bool left);
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extern void crank(bool isSubtract);
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#endif
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