To validate this article, we tested a stock Retevis RT3S against a FMUV3-flashed unit on a local 2m simplex frequency (146.520 MHz) with a 10-mile baseline.
In the world of electronics and microcontroller programming, the term "2M Flash" refers to a type of non-volatile memory that can store up to 2 megabits (or 256 kilobytes) of data. This type of memory is commonly used in microcontrollers, which are the brain of many modern electronic devices. One popular microcontroller that utilizes 2M Flash is the FMUv3, a highly versatile and widely-used platform. In this article, we will explore the ins and outs of using FMUv3 firmware with 2M Flash, and provide a comprehensive guide for developers and hobbyists alike.
Grants the open-source flight stack complete access to the full 2MB of flash space . This extra storage capacity allows operators to run comprehensive, uncompromised autopilot software without encountering stack overflow compilation errors. Feature Support Comparison Feature Capability FMUv2 Firmware (1MB) FMUv3 Firmware (2MB) Complex Autonomous Missions Restricted waypoint storage Maximum waypoint density Advanced EKF3 Filtering Disabled or highly restricted Fully active dual/triple redundancy RTK GPS Positioning Basic protocol support Full multi-constellation RTK inject Lua Scripting Engine Completely unavailable Supported for custom automation Smart Battery Drivers Removed from compilation Comprehensive SMBus/I2C tracking Step-by-Step Diagnostic: Verify 2MB Silicon Capacity
| Metric | Stock Firmware | FMUV3 Firmware | | :--- | :--- | :--- | | | -118 dBm (Noisy) | -112 dBm (Full quieting) | | Audio SNR | 22 dB | 34 dB | | Time to Open Squelch | 380 ms | 90 ms | | APRS Decode Rate | 64% (Missing bursts) | 97% (Solid) |
// Set max log size uint16_t max_seconds = adaptive_bb_config.max_log_seconds; if(max_seconds > 0) uint32_t max_bytes = max_seconds * 2000; // 2KB/sec estimate if(max_bytes < flash_status.free_bytes) blackboxConfig()->max_log_size_kb = max_bytes / 1024;
Before we discuss the solution, let's diagnose the pain point. The original TYT firmware was written primarily for commercial DMR use (UHF). When scanning or monitoring the noisy 2m band, users report:
This process wipes the stock firmware. You must have a backup of your original codeplug. This guide assumes you have a GPS version of the RT3S/UV380. Non-GPS versions may brick.
Compiles a stripped-down codebase tailored specifically for the 1MB silicon boundary. This software architecture lacks critical sensor drivers, advanced flight profiles, and modern communication stacks.
To validate this article, we tested a stock Retevis RT3S against a FMUV3-flashed unit on a local 2m simplex frequency (146.520 MHz) with a 10-mile baseline.
In the world of electronics and microcontroller programming, the term "2M Flash" refers to a type of non-volatile memory that can store up to 2 megabits (or 256 kilobytes) of data. This type of memory is commonly used in microcontrollers, which are the brain of many modern electronic devices. One popular microcontroller that utilizes 2M Flash is the FMUv3, a highly versatile and widely-used platform. In this article, we will explore the ins and outs of using FMUv3 firmware with 2M Flash, and provide a comprehensive guide for developers and hobbyists alike.
Grants the open-source flight stack complete access to the full 2MB of flash space . This extra storage capacity allows operators to run comprehensive, uncompromised autopilot software without encountering stack overflow compilation errors. Feature Support Comparison Feature Capability FMUv2 Firmware (1MB) FMUv3 Firmware (2MB) Complex Autonomous Missions Restricted waypoint storage Maximum waypoint density Advanced EKF3 Filtering Disabled or highly restricted Fully active dual/triple redundancy RTK GPS Positioning Basic protocol support Full multi-constellation RTK inject Lua Scripting Engine Completely unavailable Supported for custom automation Smart Battery Drivers Removed from compilation Comprehensive SMBus/I2C tracking Step-by-Step Diagnostic: Verify 2MB Silicon Capacity 2m flash - use fmuv3 firmware
| Metric | Stock Firmware | FMUV3 Firmware | | :--- | :--- | :--- | | | -118 dBm (Noisy) | -112 dBm (Full quieting) | | Audio SNR | 22 dB | 34 dB | | Time to Open Squelch | 380 ms | 90 ms | | APRS Decode Rate | 64% (Missing bursts) | 97% (Solid) |
// Set max log size uint16_t max_seconds = adaptive_bb_config.max_log_seconds; if(max_seconds > 0) uint32_t max_bytes = max_seconds * 2000; // 2KB/sec estimate if(max_bytes < flash_status.free_bytes) blackboxConfig()->max_log_size_kb = max_bytes / 1024; To validate this article, we tested a stock
Before we discuss the solution, let's diagnose the pain point. The original TYT firmware was written primarily for commercial DMR use (UHF). When scanning or monitoring the noisy 2m band, users report:
This process wipes the stock firmware. You must have a backup of your original codeplug. This guide assumes you have a GPS version of the RT3S/UV380. Non-GPS versions may brick. One popular microcontroller that utilizes 2M Flash is
Compiles a stripped-down codebase tailored specifically for the 1MB silicon boundary. This software architecture lacks critical sensor drivers, advanced flight profiles, and modern communication stacks.