Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics
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I2C2 hangs at while(!I2C_CheckEvent(LSM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));