Thermal Throttle Service

This service dynamically adjusts the camera framerate based on CPU temperature to prevent overheating.

It is intended for OpenIPC cameras and has only been tested on Sigmastar SoCs.

---

Overview

• Reads CPU temperature from:
  /sys/devices/virtual/mstar/msys/TEMP_R
• Adjusts camera framerate via:
  /proc/mi_modules/mi_sensor/mi_sensor0
• Uses a configuration file to define temperature → framerate rules.

---

Configuration

Configuration file path:

/etc/temp_profile.conf

Format

# <range> <fps> <scale> <update>

• min-max → Temperature range (°C)
  • Example: 60-70
• fps → Fixed FPS value (use - if not set)
• scale → Fraction of base FPS (use - if not set)
• update → Update interval in seconds

Example

# <range> <fps> <scale> <update>
0-60       -     1       5
60-70      -     0.75    5
70-80      -     0.5     5
80-90      15    -       5
90-999     5     -       5

---

Installation

This script is distributed as part of a custom package in the OpenIPC firmware build system.

1. Clone and use my OpenIPC firmware repo that contains this package.
2. Enable the package in your defconfig:

   BR2_PACKAGE_THERMAL_THROTTLE_DB=y
   

3. Build the firmware and flash it to your camera.

The service will then be available inside the firmware.