-
Notifications
You must be signed in to change notification settings - Fork 113
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
GB: MBC7 - Accelerometer and eeprom support
- Loading branch information
Showing
22 changed files
with
497 additions
and
63 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| #pragma once | ||
| #include "pch.h" | ||
| #include "Utilities/ISerializable.h" | ||
| #include "Utilities/Serializer.h" | ||
|
|
||
| class Eeprom93Lc56 final : public ISerializable | ||
| { | ||
| private: | ||
| enum class Mode | ||
| { | ||
| Idle, | ||
| Command, | ||
| ReadCommand, | ||
| WriteCommand, | ||
| WriteAllCommand | ||
| }; | ||
|
|
||
| uint8_t* _saveRam = nullptr; | ||
|
|
||
| Mode _mode = Mode::Idle; | ||
|
|
||
| bool _chipSelect = false; | ||
| bool _clk = false; | ||
| uint8_t _dataIn = 0; | ||
| bool _writeEnabled = false; | ||
|
|
||
| uint16_t _commandId = 0; | ||
| uint8_t _bitCount = 0; | ||
|
|
||
| uint8_t _readAddress = 0; | ||
| int8_t _readCounter = -1; | ||
|
|
||
| uint16_t _writeData = 0; | ||
| uint8_t _writeCounter = 0; | ||
|
|
||
| public: | ||
| void SetRam(uint8_t* saveRam) | ||
| { | ||
| _saveRam = saveRam; | ||
| } | ||
|
|
||
| uint8_t Read() | ||
| { | ||
| uint8_t result = ( | ||
| (_chipSelect ? 0x80 : 0) | | ||
| (_clk ? 0x40 : 0) | | ||
| (_dataIn ? 0x02 : 0) | ||
| ); | ||
|
|
||
| if(_mode == Mode::ReadCommand) { | ||
| if(_readCounter < 0) { | ||
| return result | 0x01; | ||
| } | ||
| return result | ((_saveRam[(_readAddress << 1) + (_readCounter >= 8 ? 0 : 1)] >> (7 - (_readCounter & 0x07))) & 0x01); | ||
| } else { | ||
| return result | (_mode == Mode::Idle ? 1 : 0); | ||
| } | ||
| } | ||
|
|
||
| void Write(uint8_t value) | ||
| { | ||
| uint8_t prevClk = _clk; | ||
| bool clk = (value & 0x40); | ||
| _dataIn = (value & 0x02) >> 1; | ||
| _chipSelect = value & 0x80; | ||
| _clk = clk; | ||
|
|
||
| if(!_chipSelect) { | ||
| //Chip select is disabled, force idle | ||
| _mode = Mode::Idle; | ||
| return; | ||
| } | ||
|
|
||
|
|
||
| if(!clk || prevClk) { | ||
| //Not a rising clock | ||
| return; | ||
| } | ||
|
|
||
| switch(_mode) { | ||
| case Mode::Idle: | ||
| if(_dataIn) { | ||
| _mode = Mode::Command; | ||
| _commandId = 0; | ||
| _bitCount = 0; | ||
| _writeCounter = 0; | ||
| _writeData = 0; | ||
| _readCounter = -1; | ||
| _readAddress = 0; | ||
| } | ||
| break; | ||
|
|
||
| case Mode::Command: | ||
| _commandId <<= 1; | ||
| _commandId |= _dataIn; | ||
| _bitCount++; | ||
|
|
||
| if(_bitCount >= 10) { | ||
| uint8_t id = _commandId >> 6; | ||
| if((id & 0b1100) == 0b1000) { | ||
| _mode = Mode::ReadCommand; | ||
| _readAddress = _commandId & 0x7F; | ||
| } else if((id & 0b1100) == 0b0100) { | ||
| _mode = Mode::WriteCommand; | ||
| } else if((id & 0b1100) == 0b1100) { | ||
| if(_writeEnabled) { | ||
| uint8_t addr = _commandId & 0x7F; | ||
| _saveRam[addr << 1] = 0xFF; | ||
| _saveRam[(addr << 1) + 1] = 0xFF; | ||
| } | ||
| _mode = Mode::Idle; | ||
| } else if((id & 0b1111) == 0b0000) { | ||
| //Disable writes (EWDS) | ||
| _writeEnabled = false; | ||
| _mode = Mode::Idle; | ||
| } else if((id & 0b1111) == 0b0011) { | ||
| //Enable writes (EWEN) | ||
| _writeEnabled = true; | ||
| _mode = Mode::Idle; | ||
| } else if((id & 0b1111) == 0b0010) { | ||
| //Erase all (ERAL) | ||
| if(_writeEnabled) { | ||
| memset(_saveRam, 0xFF, 256); | ||
| } | ||
| _mode = Mode::Idle; | ||
| } else if((id & 0b1111) == 0b0001) { | ||
| //Write all (WRAL) | ||
| _mode = Mode::WriteAllCommand; | ||
| } | ||
| } | ||
| break; | ||
|
|
||
| case Mode::ReadCommand: | ||
| _readCounter++; | ||
| if(_readCounter == 16) { | ||
| _readAddress = (_readAddress + 1) & 0x7F; | ||
| _readCounter = 0; | ||
| _mode = Mode::Idle; | ||
| } | ||
| break; | ||
|
|
||
| case Mode::WriteAllCommand: | ||
| case Mode::WriteCommand: { | ||
| _writeData <<= 1; | ||
| _writeData |= _dataIn; | ||
| _writeCounter++; | ||
| if(_writeCounter >= 16) { | ||
| if(_writeEnabled) { | ||
| if(_mode == Mode::WriteAllCommand) { | ||
| for(int i = 0; i < 0x80; i++) { | ||
| _saveRam[i << 1] = _writeData; | ||
| _saveRam[(i << 1) + 1] = _writeData >> 8; | ||
| } | ||
| } else { | ||
| uint8_t addr = _commandId & 0x7F; | ||
| _saveRam[addr << 1] = _writeData; | ||
| _saveRam[(addr << 1) + 1] = _writeData >> 8; | ||
| } | ||
| } | ||
| _mode = Mode::Idle; | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void Serialize(Serializer& s) | ||
| { | ||
| SV(_mode); | ||
| SV(_chipSelect); | ||
| SV(_clk); | ||
| SV(_dataIn); | ||
| SV(_writeEnabled); | ||
| SV(_commandId); | ||
| SV(_bitCount); | ||
| SV(_readAddress); | ||
| SV(_readCounter); | ||
| SV(_writeData); | ||
| SV(_writeCounter); | ||
| } | ||
| }; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.