Difference between revisions of "Debug device"
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Based on: https://openmsx.org/manual/user.html#debugdevice | Based on: https://openmsx.org/manual/user.html#debugdevice | ||
| − | == | + | == Debug device protocol == |
| − | < | + | The additions are surrounded with <tt>[]</tt> prefix. This proposal is 100% compatible with the old one if unused bits was set to 0. |
| − | + | ||
| + | <syntaxhighlight lang="txt"> | ||
| + | ============================================================================= | ||
Port 0x2E - Mode Set Register | Port 0x2E - Mode Set Register | ||
| − | + | ============================================================================= | |
| − | + | 7 6 5 4 3 2 1 0 | |
| − | + | │ │ │ │ └───┴───┴───┴── Mode-specific parameters | |
| − | + | │ │ └───┴────────────────── Output mode (0 = OFF, 1 = single byte, 2 = multi byte, [3 = formatted string]) | |
| − | + | │ └────────────────────────── Line feed mode (0 = line feed at mode change, 1 = no line feed) | |
| − | + | └────────────────────────────── [Functionality (0 = output, 1 = command)] | |
| − | + | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
Functionality = output, Output mode = single byte | Functionality = output, Output mode = single byte | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
| − | + | 7 6 5 4 3 2 1 0 | |
| − | + | ‖ ‖ ‖ ‖ │ │ │ └── Hexadecimal mode (0 = OFF, 1 = ON) | |
| − | + | 0 ? 0 1 │ │ └────── Binary mode (0 = OFF, 1 = ON) | |
| − | + | │ └────────── Decimal mode (0 = OFF, 1 = ON) | |
| − | + | └────────────── ASCII mode (0 = OFF, 1 = ON) | |
| − | + | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
Functionality = output, Output mode = multi byte | Functionality = output, Output mode = multi byte | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
| − | + | 7 6 5 4 3 2 1 0 | |
| − | + | ‖ ‖ ‖ ‖ │ │ └───┴── Mode (0 = hex, 1 = binary, 2 = decimal, 3 = ASCII mode) | |
| − | + | 0 ? 1 0 │ └────────── [Data width (0 = 8 bits; 1 = 16 bits)] | |
| − | + | └────────────── [Signed (0 = unsigned, 1 = signed)] | |
| + | |||
| + | ----------------------------------------------------------------------------- | ||
| + | Functionality = output, Output mode = formatted string | ||
| + | ----------------------------------------------------------------------------- | ||
| + | 7 6 5 4 3 2 1 0 | ||
| + | ‖ ‖ ‖ ‖ └───┴───┴───┴── Mode (0 = unpacked) | ||
| + | 0 ? 1 1 | ||
| + | Note: The data address must be sent via the data register. The address must point to the address of the formatting string, followed by the various parameters. 8-bit values are stored on 16-bits. | ||
| + | |||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
Functionality = command | Functionality = command | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
| − | + | 7 6 5 4 3 2 1 0 | |
| − | + | ‖ └───┴───┴───┴───┴───┴───┴── [Command ID (0x7F = break point, 0x00 = reboot)] | |
| − | </ | + | 1 |
| + | |||
| + | ============================================================================= | ||
| + | Port 0x2F - Data Register | ||
| + | ============================================================================= | ||
| + | |||
| + | Note: 16-bit values are sent in little-endian order (low byte first). | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | [[category:Proposal]] | ||
Latest revision as of 12:02, 9 May 2024
Proposal to improve the debugging protocol used by openMSX pseudo-device.
Based on: https://openmsx.org/manual/user.html#debugdevice
Debug device protocol
The additions are surrounded with [] prefix. This proposal is 100% compatible with the old one if unused bits was set to 0.
=============================================================================
Port 0x2E - Mode Set Register
=============================================================================
7 6 5 4 3 2 1 0
│ │ │ │ └───┴───┴───┴── Mode-specific parameters
│ │ └───┴────────────────── Output mode (0 = OFF, 1 = single byte, 2 = multi byte, [3 = formatted string])
│ └────────────────────────── Line feed mode (0 = line feed at mode change, 1 = no line feed)
└────────────────────────────── [Functionality (0 = output, 1 = command)]
-----------------------------------------------------------------------------
Functionality = output, Output mode = single byte
-----------------------------------------------------------------------------
7 6 5 4 3 2 1 0
‖ ‖ ‖ ‖ │ │ │ └── Hexadecimal mode (0 = OFF, 1 = ON)
0 ? 0 1 │ │ └────── Binary mode (0 = OFF, 1 = ON)
│ └────────── Decimal mode (0 = OFF, 1 = ON)
└────────────── ASCII mode (0 = OFF, 1 = ON)
-----------------------------------------------------------------------------
Functionality = output, Output mode = multi byte
-----------------------------------------------------------------------------
7 6 5 4 3 2 1 0
‖ ‖ ‖ ‖ │ │ └───┴── Mode (0 = hex, 1 = binary, 2 = decimal, 3 = ASCII mode)
0 ? 1 0 │ └────────── [Data width (0 = 8 bits; 1 = 16 bits)]
└────────────── [Signed (0 = unsigned, 1 = signed)]
-----------------------------------------------------------------------------
Functionality = output, Output mode = formatted string
-----------------------------------------------------------------------------
7 6 5 4 3 2 1 0
‖ ‖ ‖ ‖ └───┴───┴───┴── Mode (0 = unpacked)
0 ? 1 1
Note: The data address must be sent via the data register. The address must point to the address of the formatting string, followed by the various parameters. 8-bit values are stored on 16-bits.
-----------------------------------------------------------------------------
Functionality = command
-----------------------------------------------------------------------------
7 6 5 4 3 2 1 0
‖ └───┴───┴───┴───┴───┴───┴── [Command ID (0x7F = break point, 0x00 = reboot)]
1
=============================================================================
Port 0x2F - Data Register
=============================================================================
Note: 16-bit values are sent in little-endian order (low byte first).