## Radio performance
Please note that the Quansheng UV-Kx radios are not professional quality transceivers, their
performance is strictly limited. The RX front end has no track-tuned band pass filtering
at all, and so are wide band/wide open to any and all signals over a large frequency range.
Using the radio in high intensity RF environments will most likely make reception anything but
easy (AM mode will suffer far more than FM ever will), the receiver simply doesn't have a
great dynamic range, which results in distorted AM audio with stronger RX'ed signals.
There is nothing more anyone can do in firmware/software to improve that, once the RX gain
adjustment I do (AM fix) reaches the hardwares limit, your AM RX audio will be all but
non-existent (just like Quansheng's firmware).
On the other hand, FM RX audio will/should be fine.
But, they are nice toys for the price, fun to play with.
## User customization
You can customize the firmware by enabling/disabling various compile options, this allows
us to remove certain firmware features in order to make room in the flash for others.
You'll find the options at the top of "Makefile" ('0' = disable, '1' = enable) ..
```
ENABLE_CLANG := 0 **experimental, builds with clang instead of gcc (LTO will be disabled if you enable this)
ENABLE_SWD := 0 only needed if using CPU's SWD port (debugging/programming)
ENABLE_OVERLAY := 0 cpu FLASH stuff, not needed
ENABLE_LTO := 1 **experimental, reduces size of compiled firmware but might break EEPROM reads (OVERLAY will be disabled if you enable this)
ENABLE_UART := 1 without this you can't configure radio via PC !
ENABLE_AIRCOPY := 0 easier to just enter frequency with butts
ENABLE_FMRADIO := 1 WBFM VHF broadcast band receiver
ENABLE_NOAA := 0 everything NOAA (only of any use in the USA)
ENABLE_VOICE := 0 want to hear voices ?
ENABLE_VOX := 1
ENABLE_ALARM := 0 TX alarms
ENABLE_TX1750 := 0 side key 1750Hz TX tone (older style repeater access)
ENABLE_PWRON_PASSWORD := 0 power-on password stuff
ENABLE_DTMF_CALLING := 1 DTMF calling fuctionality, sending calls, receiving calls, group calls, contacts list etc.
ENABLE_BIG_FREQ := 1 big font frequencies (like original QS firmware)
ENABLE_SMALL_BOLD := 1 bold channel name/no. (when name + freq channel display mode)
ENABLE_KEEP_MEM_NAME := 1 maintain channel name when (re)saving memory channel
ENABLE_WIDE_RX := 1 full 18MHz to 1300MHz RX (though front-end/PA not designed for full range)
ENABLE_TX_WHEN_AM := 0 allow TX (always FM) when RX is set to AM
ENABLE_F_CAL_MENU := 0 enable the radios hidden frequency calibration menu
ENABLE_CTCSS_TAIL_PHASE_SHIFT := 0 standard CTCSS tail phase shift rather than QS's own 55Hz tone method
ENABLE_BOOT_BEEPS := 0 gives user audio feedback on volume knob position at boot-up
ENABLE_SHOW_CHARGE_LEVEL := 1 show the charge level when the radio is on charge
ENABLE_REVERSE_BAT_SYMBOL := 0 mirror the battery symbol on the status bar (+ pole on the right)
ENABLE_NO_CODE_SCAN_TIMEOUT := 1 disable 32-sec CTCSS/DCS scan timeout (press exit butt instead of time-out to end scan)
ENABLE_AM_FIX := 1 dynamically adjust the front end gains when in AM mode to help prevent AM demodulator saturation, ignore the on-screen RSSI level (for now)
ENABLE_AM_FIX_SHOW_DATA := 0 show debug data for the AM fix
ENABLE_SQUELCH_MORE_SENSITIVE := 1 make squelch levels a little bit more sensitive - I plan to let user adjust the values themselves
ENABLE_FASTER_CHANNEL_SCAN := 1 increases the channel scan speed, but the squelch is also made more twitchy
ENABLE_RSSI_BAR := 1 enable a dBm/Sn RSSI bar graph level in place of the little antenna symbols
ENABLE_AUDIO_BAR := 1 experimental, display an audio bar level when TX'ing
ENABLE_COPY_CHAN_TO_VFO := 1 copy current channel into the other VFO. Long press `1 BAND` when in channel mode
ENABLE_SPECTRUM := 1 fagci spectrum analyzer, activated with `F` + `5 NOAA`
ENABLE_REDUCE_LOW_MID_TX_POWER:= 0 makes medium and low power settings even lower
ENABLE_BYP_RAW_DEMODULATORS := 0 additional BYP (bypass?) and RAW demodulation options, proved not to be very useful, but it is there if you want to experiment
ENABLE_BLMIN_TMP_OFF := 0 additional function for configurable buttons that toggles `BLMin` on and off wihout saving it to the EEPROM
ENABLE_SCAN_RANGES := 1 scan range mode for frequency scanning, see wiki for instructions (radio operation -> frequency scanning)
```
## Compiler
arm-none-eabi GCC version 10.3.1 is recommended, which is the current version on Ubuntu 22.04.03 LTS.
Other versions may generate a flash file that is too big.
You can get an appropriate version from: https://developer.arm.com/downloads/-/gnu-rm
clang may be used but isn't fully supported. Resulting binaries may also be bigger.
You can get it from: https://releases.llvm.org/download.html
## Building
If you have docker installed you can use [compile-with-docker.bat](./compile-with-docker.bat) (Windows) or [compile-with-docker.sh](./compile-with-docker.sh) (Linux/Mac), the output files are created in `compiled-firmware` folder. This method gives significantly smaller binaries, I've seen differences up to 1kb, so it can fit more functionalities this way. The challenge can be (or not) installing docker itself.
To compile directly in windows:
1. Open windows command line and run:
```
winget install -e -h git.git Python.Python.3.8 GnuWin32.Make
winget install -e -h Arm.GnuArmEmbeddedToolchain -v "10 2021.10"
```
2. Close command line, open a new one and run:
```
pip install --user --upgrade pip
pip install crcmod
mkdir c:\projects & cd /D c:/projects
git clone https://github.com/egzumer/uv-k5-firmware-custom.git
```
3. From now on you can build the firmware by going to `c:\projects\uv-k5-firmware-custom` and running `win_make.bat` or by running a command line:
```
cd /D c:\projects\uv-k5-firmware-custom
win_make.bat
```
4. To reset the repository and pull new changes run (!!! it will delete all your changes !!!):
```
cd /D c:\projects\uv-k5-firmware-custom
git reset --hard & git clean -fd & git pull
```
I've left some notes in the win_make.bat file to maybe help with stuff.
## Credits
Many thanks to various people on Telegram for putting up with me during this effort and helping:
* [OneOfEleven](https://github.com/OneOfEleven)
* [DualTachyon](https://github.com/DualTachyon)
* [Mikhail](https://github.com/fagci)
* [Andrej](https://github.com/Tunas1337)
* [Manuel](https://github.com/manujedi)
* @wagner
* @Lohtse Shar
* [@Matoz](https://github.com/spm81)
* @Davide
* @Ismo OH2FTG
* [OneOfEleven](https://github.com/OneOfEleven)
* @d1ced95
* and others I forget
## License
Copyright 2023 Dual Tachyon
https://github.com/DualTachyon
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
## Example changes/updates