1. DFU (Device Firmware Upgrade) consideration

    There is an opinion that a device like FST-01 should have DFU which allows users (developers) to update its firmware.

    Yes, some boards (STBee and STBee Mini, for example) have DfuSe (DFU with STmicroelectronics' extension) installed, which eases developments. Developers are not required to have JTAG/SWD debuggers but can …

    more »

  2. Flying Stone Tiny 01 implementation

    Finally, we finished the design of FST-01.

    Components of FST-01

    • STM32F103TB
    • SPI Flash memory (32Mbit)
    • USB Terminator
    • LDO Regulator (3.3V)
    • 12MHz XTAL
    • LED
    • SWD Port of GND/SWDIO/SWDCLK
    • Extension port of VDD/GND/Port0/Port1
    • USB plug A

    STM32F103TB

    MCU is one of Cortex-M3 based ARM by STMicroelectronics …

    more »

  4. 0.5mm pitch QFP Hand Soldering for FST-01

    STM32F103CB, which is TQFP 48-pin

    For the first experimental version of FST-01, I use STM32F103CB, 48-pin TQFP chip.

    PCB Design constraint

    For FST-01 size (26mm x 13mm, approximately), I needed to have smaller pad pattern of 48-pin TQFP than recommended footprint.

    This is not good. For hand soldering, pad pattern …

    more »