Hardware Setup
This guide covers the hardware setup requirements for PY32F0xx development, including wiring, programmer connections, and common pin configurations.
Development Hardware
Minimum Requirements
- PY32F0xx Microcontroller - Any supported variant
- SWD Programmer - Multiprotocol Programmer, ST-Link v2, J-Link, or compatible
- Power Supply - 3.3V (or 1.7V-5.5V depending on variant)
- Breadboard/PCB - For prototyping connections
Recommended Setup
- Development Board with built-in SWD programmer
- Oscilloscope/Logic Analyzer for debugging
- Multimeter for voltage verification
- LED and resistor for basic output testing
SWD Programming Connections
All PY32F0xx devices support Serial Wire Debug (SWD) for programming and debugging.
Standard SWD Pinout
| SWD Signal | PY32F0xx Pin | Description |
|---|---|---|
| SWDIO | PA13 | Data line |
| SWDCK | PA14 | Clock line |
| NRST | NRST | Reset (optional) |
| GND | GND | Ground |
| VCC | VCC | Power (3.3V) |
Wiring Example (ST-Link v2)
Multiprotocol PY32F0xx
------------- --------
SWDIO <--> PA13
SWDCK <--> PA14
GND <--> GND
3V3 <--> VCC
RST <--> NRST (optional)
Package-Specific Pin Configurations
DFN8 Package (PY32F003I)
The DFN8 is a compact 8-pin package commonly used for space-constrained applications.
DFN8 Pinout (Top View):
VCC 1 ┌─────┐ 8 PB5/LED
PA0 2 │ │ 7 PA14-SWDCK/PB6
PA1 3 │ │ 6 PA13-SWDIO/PA10
PA2 4 └─────┘ 5 PB0/PF2-NRST
Verified DFN8 Configuration
This configuration is tested and working on PY32F003I DFN8:
| Pin | Function | Description |
|---|---|---|
| PA0 | USART2 TX (AF9) | Serial transmit |
| PA1 | USART2 RX (AF9) | Serial receive |
| PA2 | ADC Channel 2 | Analog input |
| PB5 | GPIO Output | Debug LED |
| PA13 | SWDIO | Programming |
| PA14 | SWDCK | Programming |
Power Supply Considerations
Voltage Requirements
- PY32F002: 1.7V - 5.5V
- PY32F003: 1.7V - 5.5V
- PY32F030: 1.7V - 5.5V
Power Connections
Power Rails:
VCC/VDD --> Main power supply (3.3V recommended)
VDDA --> Analog power (connect to VCC)
VSS/GND --> Ground (0V)
VSSA --> Analog ground (connect to GND)
Decoupling
Always include decoupling capacitors:
- 100nF ceramic close to each VCC pin
- 10μF tantalum/electrolytic for bulk decoupling
- 100nF ceramic between VDDA and VSSA
Clock Configuration
Internal Oscillators
PY32F0xx devices have built-in oscillators:
- HSI: 8MHz internal RC oscillator (default)
- LSI: ~40kHz internal low-speed oscillator
External Crystals (Optional)
For applications requiring precise timing:
- HSE: 4-32MHz external crystal
- LSE: 32.768kHz external crystal for RTC
HSE Crystal Connections:
OSC_IN --> Crystal + 12-22pF capacitor to GND
OSC_OUT --> Crystal + 12-22pF capacitor to GND
Common Test Circuits
Basic LED Test
PB5 --> 330Ω resistor --> LED --> GND
Serial Communication Test
PA0 (TX) --> RX of USB-to-Serial adapter
PA1 (RX) <-- TX of USB-to-Serial adapter
GND --> GND of USB-to-Serial adapter
ADC Input Test
PA2 --> 10kΩ potentiometer --> GND
(center tap to PA2)
Troubleshooting Hardware Issues
Programming Issues
-
Can't connect to device
- Check SWD wiring (SWDIO, SWDCK, GND)
- Verify power supply (3.3V)
- Try different SWD frequency
-
Device not responding
- Check NRST connection
- Verify crystal oscillator (if using HSE)
- Try holding NRST low during connection
Runtime Issues
-
LED not blinking
- Check LED polarity and current-limiting resistor
- Verify GPIO configuration in code
- Measure voltage on GPIO pin
-
Serial not working
- Check baud rate (9600 default)
- Verify TX/RX wiring (not crossed)
- Test with known-good USB-to-Serial adapter
-
ADC readings incorrect
- Check VDDA connection
- Verify input voltage range (0-VDDA)
- Check reference voltage configuration
Safety Guidelines
- Never exceed maximum voltage ratings
- Use current-limiting resistors with LEDs
- Double-check power supply polarity
- Avoid ESD damage - use anti-static precautions
- Keep connections short for high-frequency signals
Next Steps
Once your hardware is set up:
- Follow the Development Environment guide
- Try the First Program tutorial
- Explore Working Examples