Difference between revisions of "Debug device"
From MSX Game Library
| Line 12: | Line 12: | ||
7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 | ||
│ │ │ │ └───┴───┴───┴── Mode-specific parameters | │ │ │ │ └───┴───┴───┴── Mode-specific parameters | ||
| − | │ │ └───┴────────────────── Output mode (0 = OFF, 1 = single byte, 2 = multi byte, [3 = | + | │ │ └───┴────────────────── 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) | │ └────────────────────────── Line feed mode (0 = line feed at mode change, 1 = no line feed) | ||
└────────────────────────────── [Functionality (0 = output, 1 = command)] | └────────────────────────────── [Functionality (0 = output, 1 = command)] | ||
| Line 30: | Line 30: | ||
7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 | ||
‖ ‖ ‖ ‖ │ │ └───┴── Mode (0 = hex, 1 = binary, 2 = decimal, 3 = ASCII mode) | ‖ ‖ ‖ ‖ │ │ └───┴── Mode (0 = hex, 1 = binary, 2 = decimal, 3 = ASCII mode) | ||
| − | 0 ? 1 | + | 0 ? 1 0 │ └────────── [Data width (0 = 8 bits; 1 = 16 bits)] |
└────────────── [Signed (0 = unsigned, 1 = signed)] | └────────────── [Signed (0 = unsigned, 1 = signed)] | ||
| + | |||
| + | ----------------------------------------------------------------------------- | ||
| + | Functionality = output, Output mode = formatted string | ||
| + | ----------------------------------------------------------------------------- | ||
| + | 7 6 5 4 3 2 1 0 | ||
| + | ‖ ‖ ‖ ‖ └───┴───┴───┴── Mode | ||
| + | 0 ? 1 1 | ||
----------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | ||
Revision as of 23:37, 5 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 ? 1 1
-----------------------------------------------------------------------------
Functionality = command
-----------------------------------------------------------------------------
7 6 5 4 3 2 1 0
‖ └───┴───┴───┴───┴───┴───┴── [Command ID (0x7F = break point)]
1