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Processor: STM32F103CBT7, 32 ARM Cortex-M3 processor
Frequency: 72 MHz
128 KB Flash and 20 KB SRAM
34x digital io ports (GPIOs)
12x 16-bit precision PWM port
9x 12-bit precision analog input (ADC) port
2x SPI channels
2x I2C channels
7-channel direct memory access (DMA) (dma.h)
3x USART (serial) channel
An enhanced and three general purpose timers
Can be programmed directly via the USB port and communications program
An external JTAG
Nested Vectored Interrupt Controller (NVIC) (including GPIOs on the external interrupt)
Support for low-power, sleep and standard mode (<500 µA)
Operating Voltage: 3.3 V
Input Voltage (recommended): 3 V - 12 V
Size: 52mm× 19mm

Maple Mini has a total of 34 input / output pins, numbered from D0 to D33. Maple Mini label on the screen corresponds to the port and its adjacent. However, they have some of the default has a special purpose.
D23 is the USB port D +, D24 is the USB D-. Such as their use as GPIO, then your program must first disable the USB port. But you know, disable USB serial bootloader means that priority will not work, you will need to pass Perpetual Bootloader for the next update.
Port D32 is the Mini button port. Therefore, it is mainly used as an input port. When the key is pressed, the magnetic port will read high.
Port D33 is the Mini LED port. Therefore, its main role is as an output port. When it was written with high, LED lights will be lit

to program this install this library (and follow guide)

and to upload
board = maple mini
bootloader version = original

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