OpenGD77

Yaesterday released
https://opengd77.eu/index.php?dir=MD960 ... R20260131/

Thanks!

Hello,

I've quickly analysed sources files between 2024 and 2026 version as I don't have 2025 sources!

# Changelog

All notable changes to the OpenGD77 MD9600 firmware between release **20240908** (2024-09-08) and **20260131** (2026-01-31) are documented here. This file is derived from source code comparison; the project did not ship an official changelog.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).

---

## [2026.01.31] - 2026-01-31

### Fixed

- **Latitude/longitude fixed-point conversion (24- and 32-bit).** The previous `latLongDoubleToFixed24` and `latLongDoubleToFixed32` implementations used incorrect bit layout (e.g. `intPart << 23` for 24-bit format, which should use 15 fractional bits). This could cause wrong GPS position, APRS data, Maidenhead display, and distance-based sorting. Correct formulas now use `modf()` and dedicated constants; functions were renamed to `latLon*` (typo fix: Long → Lon). Affects: `application/source/user_interface/uiUtilities.c` and all callers (APRS, satellite, display, etc.).

- **APRS codeplug format and version.** `APRS_MAGIC_VERSION` updated from `0x4152` to `0x4153`. APRS buffer version field (`APRS_Buf->magicVer`) is now set explicitly at initialisation to avoid undefined behaviour. Type renamed to `CodeplugCustomDataType_t` for consistency. Affects: `application/source/functions/codeplug.c` and related headers.

### Added

- **Centralised location API.** New accessors for stored position:
- `settingsLocationGetLatitude()` and `settingsLocationGetLongitude()`
- `settingsLocationIsValid()` to detect uninitialised location
- Position is now stored in `nonVolatileSettings.location.lat` and `nonVolatileSettings.location.lon`. All code paths (APRS, satellite, channel, GPS, USB, etc.) use this API. Affects: `application/source/functions/settings.c`, `application/include/functions/settings.h`, and all modules that use location.

- **Reusable distance helper.** New function `distanceBetweenTwoCoords(lat1, lon1, lat2, lon2, inKm)` in `uiUtilities.c`. `distanceToLocation()` now uses this and the new location API.

- **Maidenhead string builder.** New helper `buildMaidenHead()` in `uiUtilities.c` with correct fixed-point-to-double conversion (`LOCATION_DECIMAL_PART_MULIPLIER_FIXED_32_DOUBLE`) and use of `nonVolatileSettings.location`.

- **Hotspot UI: optional double-height display.** Support for double-height text via `GET_Y_POS_WHEN_DOUBLE_HEIGHT_ENABLED` and `displayPrintCenteredDoubleHeight` in `application/source/user_interface/uiHotspot.c`.

### Changed

- **Hotspot display state.** `displayFWVersion` moved from a static variable into a dedicated structure (`hotspotData`) in `uiHotspot.c` for clearer state handling.

- **Codeplug type naming.** Types renamed from `struct_codeplug*` to `Codeplug*` (e.g. `CodeplugDeviceInfo_t`, `CodeplugSignallingDTMFDurations_t`, `CodeplugCustomDataType_t`) for consistency across the codebase.

- **FreeRTOS, STM32 HAL, USB, CMSIS.** Updated third-party and middleware code:
- FreeRTOS (CMSIS-RTOS v2, tasks, timers, heap, ARM CM4F port)
- STM32F4xx HAL (DMA, Flash, GPIO, I2S, PWR, etc.)
- USB device and CDC stack
- CMSIS (including TrustZone `tz_context.h`).
Affects: `Core/Src/freertos.c`, `Middlewares/Third_Party/FreeRTOS/`, `Drivers/STM32F4xx_HAL_Driver/`, `USB_DEVICE/`, `Drivers/CMSIS/Include/tz_context.h`, and related files.

---

## [2024.09.08] - 2024-09-08

Baseline release used for comparison (OpenGD77 MD9600 20240908). No changelog content for this date; see above for changes introduced in 20260131.

- **New options and menu entries (2026):**
- **APRS options:** New **APRS Power** menu item (`OPTIONS_MENU_APRS_POWER`). Choose “From Master” (use master power) or a specific power level for APRS beaconing.
- **General options:** New **Channels are read only** menu item (`GENERAL_CHANNELS_ARE_READ_ONLY`). When enabled, channel list is read-only (no edit from radio). Option bit: `BIT_CHANNELS_ARE_READ_ONLY`.
- **Display options (MD9600):** New **Time in header** (`DISPLAY_TIME_IN_HEADER` / `BIT_DISPLAY_TIME_IN_HEADER`) to show time in the header. New **DMR Last talker on screen** (`DISPLAY_DMR_LAST_TALKER_ON_SCREEN`) with timer 0–30 seconds (`lastTalkerOnScreenTimer`).
- **TX Inhibit:** New global option **TX Inhibit** (`BIT_TX_INHIBIT`). New notification type/ID: `NOTIFICATION_TYPE_BEARING`, `NOTIFICATION_ID_BEARING`, `NOTIFICATION_ID_TX_INHIBIT` in `menuSystem.h`.
- **UI double height:** New option **UI uses double height** (`BIT_UI_USES_DOUBLE_HEIGHT`) for larger text.
- **GPS:** GPS mode and baudrate stored in a single byte `gpsModeAndBaudsIndex` (4 low bits: mode, 4 high bits: baudrate index). Macros: `SETTINGS_GPS_MODE_GET/SET`, `SETTINGS_GPS_BAUDRATE_GET/SET`.
- **Roaming:** New `roaming_t` enum (Off, Manual, 5 km, 10 km, 20 km) and `roaming` field in settings for roaming behaviour.

- **New / extended functions (API):**
- `settingsLocationGetLatitude()`, `settingsLocationGetLongitude()`, `settingsLocationIsValid()` (see above).
- `distanceBetweenTwoCoords(lat1, lon1, lat2, lon2, inKm)`.
- `buildMaidenHead()` for Maidenhead string from fixed-point location.
- Settings bitfield extended to a banked array `bitfieldOptions[SETTINGS_BITS_NUMBER_OF_BANKS]` for future expansion (currently one bank). New bits: `BIT_TX_INHIBIT`, `BIT_DISPLAY_TIME_IN_HEADER`, `BIT_CHANNELS_ARE_READ_ONLY`, `BIT_UI_USES_DOUBLE_HEIGHT`.

- **Language / UI strings (2026):** Language struct version bumped (e.g. `LANGUAGE_TAG_VERSION` 0x03 → 0x05). New strings in language files: `tx_inhibit`, `roaming`, and strings used for the new options above (e.g. “Ch Power”, “From Master” for APRS Power; “TX Inhibit”; etc.).

F4EGM wrote: Tue Feb 03, 2026 11:03 pm - **New options and menu entries (2026):**
- **APRS options:** New **APRS Power** menu item (`OPTIONS_MENU_APRS_POWER`). Choose “From Master” (use master power) or a specific power level for APRS beaconing.
- **General options:** New **Channels are read only** menu item (`GENERAL_CHANNELS_ARE_READ_ONLY`). When enabled, channel list is read-only (no ed...

Thank you for this! So do you think these changes also apply for the 380/390 radios etc.?

Yes, I guess it's the same software but I need to spend more time to analyse files.
I own a UV390 GPS too with my MD9600 (gps added)

I've tried with my UV390 GPS and at least I've seen the possibility to double the size on the display! So Yes they apply to other radios

F4EGM wrote: Thu Feb 05, 2026 8:46 pm I've tried with my UV390 GPS and at least I've seen the possibility to double the size on the display! So Yes they apply to other radios

Good to know. I also own a UV390 w/ gps, it's a great radio!

And it's still possible to save channels settings using SK2 + green button