80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* flash_4mbit.h
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*
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* Created on: Jul 27, 2021
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* Author: Doug
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*
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* Copyright (C) 2011-2021 Doug Brown
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef FLASH_4MBIT_H
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#define FLASH_4MBIT_H
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#include "gpio_sim.h"
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#define FLASH_4MBIT_DATA_PINS 8
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#define FLASH_4MBIT_ADDR_PINS 19
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/// Enum representing the type of 4-megabit flash chip being emulated
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typedef enum Flash4MBitDeviceType
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{
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/// SST/Microchip SST39SF040 4-megabit flash chip
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Flash_SST39SF040,
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/// AMD/Infineon AM29F040B 4-megabit flash chips
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Flash_AM29F040B,
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} Flash4MBitDeviceType;
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/// Implementation of GPIOSimDevice for a 4-megabit flash chip
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typedef struct Flash4MBit
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{
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/// Base class
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GPIOSimDevice base;
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/// The type of flash being emulated
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Flash4MBitDeviceType type;
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/// Current data input state
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uint8_t dataInput;
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/// Current address
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uint32_t address;
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/// The write address that has been latched
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uint32_t latchedWriteAddress;
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/// True if CS is asserted
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bool csAsserted;
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/// True if OE is asserted
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bool oeAsserted;
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/// True if WE is asserted
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bool weAsserted;
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/// True if we've activated software ID mode
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bool softwareIDActivated;
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/// All of our pins
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GPIOPin csPin;
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GPIOPin oePin;
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GPIOPin wePin;
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GPIOPin dataPins[FLASH_4MBIT_DATA_PINS];
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GPIOPin addressPins[FLASH_4MBIT_ADDR_PINS];
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/// The state -- private so we store as an 8-bit int rather than the enum
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uint8_t state;
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uint8_t *content;
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} Flash4MBit;
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void Flash4MBit_Init(Flash4MBit *f, Flash4MBitDeviceType t);
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void Flash4MBit_SetControlPins(Flash4MBit *f, GPIOPin cs, GPIOPin oe, GPIOPin we);
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void Flash4MBit_SetDataPin(Flash4MBit *f, uint8_t index, GPIOPin pin);
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void Flash4MBit_SetAddressPin(Flash4MBit *f, uint8_t index, GPIOPin pin);
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#endif // FLASH_4MBIT_H
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