Debugging gadgets, a large collection of Bluetooth&hid&serial&hub

21IC link: https://bbs.21ic.com/icview-2946530-1-1.html  , both sides are the same. This debugging board comes with an SL2.1A 1 to 4hub, one of which is connected to stm32, and the remaining 3 leads can be connected to 3 USB devices. Each USB port has a 2A current limit to prevent short circuits.

There is a Bluetooth BLE device onboard, the Bluetooth chip is BC7601, connected to stm32 through spi,

Use stm32 to simulate hid device to realize information exchange between computer and stm32

And it leads to two serial ports, an 8-channel level input/output, a 3-channel PWM output, one of which is an independent output, two channels of same-frequency output, and a set of SPI. Reasonable use can drive many peripherals. And both the serial port and IO input and output ports use isolation or level conversion, supporting 1.6~5.5V level. The board provides 3.3V and 5V level drive options, and can also provide power from the outside. The PWM and SPI interfaces are fixed at 3.3V. Output, supports 5V level input, single SPI only serves as the main device. The 8 IO ports use TVS diodes with a voltage limit of 5.5V to prevent external input reverse connection and overvoltage.