Float decoder not being called when using RTTConfig

[tyouard]

I have set up the 'rttConfig' with a decoder which should output float values into the RTT terminal in VS Code

my launch.json enables RTT like this:

 "rttConfig": {
          "enabled": true,
          "address": "auto",
          "decoders": [{"type": "binary", "port": 0, "label": "RTT0", "encoding": "float"}]
      },

However, the RTT terminal in VS Code is only decoding the values as unsigned instead of float:

For example, in that output the hex value 0x0000003f should decode to float value 0.5, but instead it is decoding to 1056964608

Reproduction:

1. Target has SEGGER RTT enabled and is sending raw float32 values to channel 0.
2. launch.json configured to display a single RTT channel 0. type=binary. encoding=float
3. Click Run and Debug in VS Code. Launch.
4. Open RTT terminal in VS Code. You can see the values being read over RTT.
5. Values are not being formatted as floats, but as unsigned.

Environment:

• Cortex-Debug Version 1.12.1
• OS: Linux Ubuntu 24.04.4 LTS
• GDB Version: gdb-multiarch (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
• Compiler Toolchain Package: gcc-arm-none-eabi Version: 15:13.2.rel1-2

Launch.json:
{
"version": "0.2.0",
"configurations": [
{
"name": "launch app",
"cwd": "${workspaceFolder}",
"executable": "${workspaceFolder}/application/XXX.elf",
"runToEntryPoint": "main",
"request": "launch",
"type": "cortex-debug",
"servertype": "jlink",
"device": "XMC4400-512",
"interface": "swd",
"gdbPath": "gdb-multiarch",
"armToolchainPath": "/usr/bin",
"svdFile": "${workspaceFolder}/.vscode/XMC4400.svd",
"rttConfig": {
"enabled": true,
"address": "auto",
"decoders": [{"type": "binary", "port": 0, "label": "RTT0", "encoding": "float"}]
},
"breakAfterReset": true,
"showDevDebugOutput": "raw"
},
]
}

`

Debug console:

debug_console_output.txt

[haneefdm]

That was a mistake. I didn't even know float was an option. I will see if a fix is possible.

Thanks for reporting this