limeGUI crashed SIGFPE during TX calibration on LimeSDR Mini

[dtv-comp]

Description

When attempting TX calibration on LimeSDR Mini using limeGUI, the application crashes with a SIGFPE (floating point exception).

Steps to Reproduce

1. Launch limeGUI on Ubuntu 24.04
2. Connect a LimeSDR Mini
3. Start TX calibration
4. Observe the crash

Expected Behavior

TX calibration should complete successfully or handle invalid RSSI values gracefully.

Actual Behavior

The program crashes with a SIGFPE at line 1059 in calibration.c due to division by zero.

Relevant Code

if ((rssi * 100) / rssi_prev < 105) // pga should give ~1dB change

Here, rssi_prev == 0, causing a floating point exception.

System Information

• OS: Ubuntu 24.04
• Hardware: LimeSDR Mini
• Application: limeGUI (LimeSuiteNG)
• Error: SIGFPE at calibration.c:1059

Build Info

• Branch: develop
• Commit: de344a5

Attachments

Screenshots related to the crash:

Suggested Fix

Add a check to prevent division by zero:

if (rssi_prev != 0 && (rssi * 100) / rssi_prev < 105)