安装i2ctools sudo apt-get install i2c-tools
检测i2c总线 i2cdetect -r -y 1
写 i2ctransfer -f -y 1 w3@0x36 0x50 0x81 0x01
读 i2ctransfer -f -y 1 w2@0x36 0x30 0x0a r3
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