Py32 dev

py32_dev

KiCad design for a ARM Cortex-M0+ development board. The MCU is a Puya PY32 Series. The specific part is PY032F030K18T6. This can run at a maximum of 48 MHz, and has 8 kbyte SRAM and 64 kbyte Flash. A USB C connector provides 5V power only to the development board. The board must be programmed with a debugger. External crystals are laid out for the MCU to use a 32.768 kHz low speed crystal or a 24 MHz high speed crystal. There is an onboard LDO that provides 500mA of power at 3.3V. A resettable fuse protects the USB port from a short. There is an LED and push button connected to 2 of the GPIO pins. The value of the BOOT0 pin can be set to ground or 3.3V permanently via the solder bridge. A jumper can be used on the pin rails in lieue of the solder bridge. All available GPIO pins are routed to the 2 18pin headers.

Changes

• Rev B Moved resettable fuse away from USB C connector, giving more room to resolder connector pins.

• Rev A Original

Firmware

Example firmware that blinks the LED. When the user pushbutton is pressed, the frequency of the LED blink will change.

https://github.com/gpgreen/py32-dev-blink

Boot configuration

To boot from main flash [0x0800_0000] Connect J2-4 to J2-5 (or) solder JP5-1 to center post

To boot from System mem [0x1FFF_0000], or Embedded SRAM [0x2000_0000] Connect J2-4 to J2-3 (or) solder JP6-3 to center post

There is an embedded boot loader, programmed in production, in the system memory block. See the reference manual 3.6.2.

PIN JUMPER SIGNAL ASSIGNMENT

                    +-----+
            +--------------------+
            |J3     |     |    J2|
        VDD-|1      +-----+     1|-GND
        GND-|2                  2|-GND
       +3.3-|3                  3|-+3.3
[RESET] PF2-|4                  4|-PF4 [BOOT0_PRE]
[SWCLK]PA14-|5                  5|-GND
[SWDIO]PA13-|6                  6|-GND
        GND-|7       RST        7|-GND
        PF3-|8       +-+        8|-GND
        PA0-|9       |O|        9|-GND
        PA1-|10      +-+       10|-PB7
        PA2-|11                11|-PB6
        PA3-|12                12|-PB5
        PA4-|13                13|-PB4
        PA6-|14                14|-PB3
        PA6-|15   UPB          15|-PA15
        PA7-|16   +-+          16|-PA12 [USER LED - GREEN]
        PB0-|17   |O|          17|-PA11 [USER PUSHBUTTON]
        PB1-|18   +-+          18|-PA8
            |                    |
            +--------------------+

Connections to JTAG

From a 20pin JTAG connector, run wires to the following pins to connect a debugger:

VTRef 1 <-> J3-3 SWDIO 7 <-> J3-6 SWCLK 9 <-> J3-5 RESET 15 <-> J3-4 5V 19 <-> NC GND 4 <-> J3-2 GND 20 <-> J3-7

Running SEGGER JLink

Run the JLink GDB server via the following:

JLinkGDBServer -if SWD -JLinkDevicesXMLPath ~/.config/SEGGER/JLinkDevices/Puya/PY32/JLinkDevices.xml -device PY32F030xx8

GDB can be connected via the following:

gdb-multiarch --command=jlink-py32.gdb target/thumbv6m/debug/blink-py32

Links

• Puya PY32 Series
• Software template for PY32 Series by Jay Carlson
• Fork of template for these boards
• Tech documentation for py32f030