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PY32F002 - Chinese ARM for 8 cents from PUYA

piotr_go 39021 77

TL;DR

  • PUYA PY32F002 and PY32F003 are ultra-cheap ARM Cortex-M0+ microcontrollers aimed at simple embedded designs, with SPI, USART, I2C, ADC, timers, and SWD programming.
  • PY32F002 offers 20kB FLASH and 3kB RAM at 24/32MHz, while PY32F003 adds DMA, more timers, and larger memory variants.
  • J-Link support works by copying the supplied .FLM files into /opt/SEGGER/JLink/Devices/Puya/ and adding the Puya device entries to JLinkDevices.xml.
  • Testing showed occasional RESET-related HardFaults, about 2x overclocking with flash wait-state and oscillator calibration changes, and roughly 5uA sleep current.
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📢 Listen (AI):
  • #61 20968014
    HwT
    Level 5  
    For the 8 pin (SOP8) PY32F002AL15S6TU, how would i flash this device? using J-link, USART RX/TX and PA14 ?
    This model does not have a boot0 mode, only reset/nrst button?
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  • #62 20968118
    piotr_go
    DIY electronics designer  
    J-link SWD
  • #63 20983264
    HwT
    Level 5  
    I'm trying to connect to the 8 pin (SOP8) PY32F002AL15S6TU via PuyaISP, but i cant really get it working, how should i enter the bootloader? I have tried pulling pin 6 (PA2/PF2-NRST) both high and low while power-cycling the MCU, but PuyaISP wont connect,

    Is pulling NRST high the correct method to enter the bootloader? This package does not have a dedicated BOOT0 pin,

    I have the option to try J-Link, does Puya have some tool to upload or read the mcu info via this? I have tried PuyaProgrammer but it can't find the USB device to use for SWD, For the J-link i'm using a nucleo board i have converted to J-link, but i belive Puya has its own programmer but it should be compatible ?
    SOP8 pin layout diagram for PY32F002AL15S6TU chip PuyaISP V1.0.1.7 interface with connection error.
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  • #64 20983515
    piotr_go
    DIY electronics designer  
    No BOOT0, no PuyaISP.
    J-link recipe in first post.
  • #65 21055304
    piotr_go
    DIY electronics designer  
    I think they got ripped off with the price: :D
    Screenshot of a price table for RISC-V microprocessors.
    Comparison table of RISC-V (RV32IMAC) microcontroller specifications with various models and features, with USB functioning at 3-5V.
    RISC-V (RV32IMAC) 48MHz
    USB works with 3...5V supply. 👍
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  • #67 21055425
    piotr_go
    DIY electronics designer  
    After all, I have inserted a price list.
  • #68 21055784
    Macosmail
    Level 35  
    An obvious mistake, and the MCU interesting. I've had them for a while now. They worked out at £2.16 apiece for me when I bought 50 at the end of 2023
    Image of a package of black integrated circuits covered with plastic wrap. .
  • #69 21056150
    piotr_go
    DIY electronics designer  
    Aliexpress? At LCSC they only have QFN.
    It's a pity they didn't give a USB Host in the TSSOP20.
  • #70 21057260
    Macosmail
    Level 35  
    Yes Aliexpress.
    No, CAN is not present regardless of the housing is a small drawback. For that it has a curiosity PIOC which is an additional small 8 -bit core conceived to support various non-standard interfaces. Too bad it is limited to just two GPIOs. There is an example of the WS2812. Unfortunately this is programmed in ASM using external tools under Windows and then pasted in HEX into an appropriately allocated array, which becomes the program memory for this PIOC.
    There is also the impossibility of connecting a quartz (and any other clock signal):-) .
  • #71 21057390
    piotr_go
    DIY electronics designer  
    Macosmail wrote:
    It is also interesting not to be able to connect a quartz (and any other clock signal)

    Ooooooo, I hadn't noticed that.
  • #72 21341045
    stożek
    Level 12  
    I built the circuit from the website: https://github.com/flaviut/fan-controller.
    It is based on a 32f002a processor.
    I have a blue pill j-link clone but something i can't program it?
    Any ideas - I connect +3.3V (or 5) gnd and sclk and sdo according to the pins and still get the message
    J-Flash V8.10k error when attempting to connect to a device. .
    The circuit is like this
    Close-up of a PCB with components and a visible F002A 1529 chip.
  • #73 21341265
    piotr_go
    DIY electronics designer  
    Have you tried programming the processor itself?
  • #74 21341448
    stożek
    Level 12  
    piotr_go wrote:
    Tried to program the processor itself?
    .
    Yes, but I wonder if it's not a problem with the power supply voltage - jlink bluepill gives 3.3V and this puya jets 5V ( although in the datasheet it says that it is from 1.7V but I guess that's only ports ?)
    Generally maybe it's a problem with reset - 8-pin version doesn't have it ?
    In general, I got very discouraged with puya - compared to it, a regular stm32 is a piece of cake when programming.
  • #75 21341486
    piotr_go
    DIY electronics designer  
    I had no problems with programming at 3V3.
    Reset pin 6.
    Post the schematic in some kind of graphical format. I don't have kicad at hand.
    Didn't you program it with something before? Maybe locked.
  • #76 21341732
    stożek
    Level 12  
    Diagram attached.
    Attachments:
    • Schematic Prints.pdf (22.77 KB) You must be logged in to download this attachment.
  • #77 21341761
    piotr_go
    DIY electronics designer  
    Looks OK. Don't you have some kind of short circuit?
    Maybe try with a low reset on power up, let it go when you click programming.
  • #78 21342713
    stożek
    Level 12  
    piotr_go wrote:
    Looks OK. Don't you have some kind of short circuit?
    Maybe try with a low reset at power up, let it go when you click programming.
    .
    After many buoys it is now working - I used a tut from here:
    https://www.eevblog.com/forum/microcontroller...324kb-more-peripherals/msg5464000/#msg5464000
    It's a bit weird talking over telnet like that, but all in all, the important thing is that it works.
    And the bone on the board was bricked - straight to the bin!
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Topic summary

✨ The discussion revolves around the PY32F002 and PY32F003 microcontrollers from PUYA, which feature an ARM Cortex M0+ core and are priced at 8 cents and 16 cents, respectively. Users express interest in purchasing these microcontrollers, with links provided to suppliers like LCSC. The PY32F002 offers 20kB FLASH and 3kB RAM, while the PY32F003 includes additional features like DMA and more timers. The microcontrollers support various interfaces (SPI, USART, I2C, ADC) and have a power supply range of 1.7V to 5.5V. Users discuss programming methods, compatibility with STM32, and the availability of development tools. There are also mentions of challenges in programming and documentation access, particularly for the QFN package. Overall, the conversation highlights the growing interest in low-cost ARM microcontrollers and their potential applications.
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FAQ

TL;DR: PUYA’s PY32F002 ARM-M0+ MCU costs just 0.08 USD, "surprisingly good for such a ridiculous price" [Elektroda, l0ud, post #20366259], and draws ~5 µA in sleep [Elektroda, piotr_go, post #20364764] Ideal for ultra-low-cost 32-bit projects.

Why it matters: You can replace 8-bit parts with a faster, pin-compatible ARM for pocket change.

Quick Facts

• Core: Cortex-M0+ @ 24 / 32 MHz, up to 96 MHz overclocked [Elektroda, piotr_go, post #20380514] • Memory: 20 kB FLASH / 3 kB RAM (002) — hidden 32 kB FLASH / 4 kB RAM in some lots [Elektroda, piotr_go, post #20375532] • Peripherals: SPI, USART, I²C, ADC, timers; DMA on 003 & many 002 samples [Elektroda, l0ud, post #20366259] • Supply: 1.7 – 5.5 V, 5 µA sleep current [Elektroda, piotr_go, post #20364764] • Price: 0.08 USD each-1000, $0.20 retail at LCSC [Elektroda, piotr_go, #20364764; LCSC pricing]

Can I flash them with a standard J-Link?

Yes. Copy PUYA *.FLM loaders into /Devices/Puya/ and add the four XML entries shown in the first post, then connect SWDIO/SWCLK/GND/3 V3 [Elektroda, piotr_go, post #20364764]

Is ST-Link V2 usable?

Convert the ST-Link on a NUCLEO to J-Link, then follow the same XML procedure; Segger confirms support for ST-Link-on-board hardware [Elektroda, piotr_go, post #20513639]

Quick 3-step J-Link flashing guide

  1. Wire SWDIO→PA13, SWCLK→PA14, NRST→pin 6, 3 V3, GND.
  2. Add Puya entries to JLinkDevices.xml.
  3. Run JLinkExe, then loadfile firmware.hex. Done in under a minute.

How long does budget shipping from LCSC take?

Global Direct Standard Line costs USD 5.80 and arrives within 7–15 days in Europe, based on repeated orders [Elektroda, piotr_go, post #20382173]

What IDEs or SDKs work?

VS Code plus Cortex-Debug + GCC builds fine; OpenOCD or PyOCD handle debug once you add the custom target file [Elektroda, l0ud, post #20576582] A minimal vendor HAL is on GitHub [MiltonLai, #20381781].

How low is the power draw?

With LSI and flash sleep the MCU consumes 8 µA active and ~5 µA in sleep, beating STM32F0 and AVR at equal clock [Elektroda, l0ud, post #20366259]

Any hidden ‘bonus’ features?

Many PY32F002AA15 parts actually contain the bigger PY32F030 die with extra USART, SPI, DMA and PLL—32 kB FLASH, 4 kB RAM verified via code readback [Elektroda, piotr_go, post #20375532]

Known edge cases or failures?

Toggling an external RESET sometimes triggers a HardFault while accessing AHB/APB; disable the pin or avoid resets during flash overclocking [Elektroda, piotr_go, post #20364764]

How do I unbrick a mis-configured chip?

Hold NRST low, power up, release NRST, then issue reset halt; flash erase_sector 0 0 last over OpenOCD. Bootloader lock bits clear, proven on QFN20 parts [Elektroda, wichers, post #20525933]
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