This is an exploded version of the Mini17 UHF handheld tranceiver, a TR-9 successor. Its purpose is to allow for experimentation with the CC1200 chip and its M17 use. In other words, it's an STM32+CC1200 evaluation board.
To enter the DFU mode, keep BTN2 pressed while powering the board up. A sample firmware (CubeIDE project) is available through a separate repository. Another example is in the MCU folder.
cd C:\path\to\the\binary\file
dfu-util -d 28e9:0189 -a 0 -D Exploded_Mini17.bin -s 0x8000000
Change the binary file's name if needed.
The Exploded Mini17 has all the peripherals a walkie-talkie development board should have:
- GD32/STM32F405RGT6 micro with most of the unused pins available at the 2.54mm pin headers,
- RF front end built around CC1200 chip,
- 90° SMA connector,
- set of 3 buttons,
- microphone and a 1W speaker, along with amplifiers,
- USB-C connector for programming and power supply.
| Designator | Function | Remarks |
|---|---|---|
CN1 |
External power supply | 6..15V |
CN2 |
External Button 1 | Low-active |
CN3 |
External Button 2 | Low-active |
CN4 |
External interrupt | Max. 3.3V |
CN5 |
External Button 3 | Low-active |
CN6 |
External speaker output | ≥8ohms, set U6/U7 jumpers accordingly |
CN7 |
External microphone input | set U10 jumper accordingly, bias provided by U9 |
H1 |
GPIO port, 3 I/O lines | Max. 3.3V |
H2 |
SWD | |
H3 |
GPIO port, 3 I/O lines | Max. 3.3V |
H4 |
GPIO port, 11 I/O lines | Max. 3.3V |
H5/ANALOG |
Analog I/O port | Max. 3.3V |
H6 |
GPIO port, 6 I/O lines | Max. 3.3V |
| Designator | Function | Remarks |
|---|---|---|
TP1 |
Speaker output signal, negative | |
TP2 |
Speaker output signal, positive | |
TP3 |
Audio DAC output signal | |
TP4 |
Speaker amplifier input signal | |
TP5 |
Microphone signal | DC-biased |
TP6 |
Amplified microphone signal | DC-biased |