'Repurposing a PLC Clone for Use with Arduino' stm32 arduino
The aforementioned board, sports a STM32F103 microcontroller, so instinctively a footprint for a SWD programming header should be looked for.After following the tracks of this header, one pin was found connected to 3.3 V, another one to GND, but the other two pins were not connected to SWD pins on the microcontroller but to PC10 and PC11 pins.
Luckily in this board, the resistor which is connected to the BOOT0 pin is clearly marked on the silkscreen. To start in bootloader mode, a male header was soldered to the 3.3 V pad, and using a Dupont wire jumper, a temporary connection between BOOT0 and 3.3 V is made while the board is powered upwas launched and communication with the microcontroller was verified. The chip was in read protect mode, so no way to backup the firmware to reverse the board to its original state.
Because of the lack of a schematic diagram, or marks in the silkscreen showing which microcontroller I/O pins goes to which peripheral, this work must be done manually, with a lot of patience to follow the tracks. Fortunately the board has only 2 layers, so it is possible to start with only a double-eye magnifier for jewelry and a multimeter.The board has two LED indicators, one labeled as RUN an the other labeled as ERR.
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