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Constructing a Request for Obtaining the Temperature of a Standard Card
STD_SMBUS_REQ req = {0};
//Send a request packet.
req.lun = 0x80;
req.arg = (unsigned char)item_type;
req.opcode = (unsigned short)opcode;
req.offset = (unsigned int)offset;
req.length = (unsigned int)lenth;
i2c_smbus_write_block(dev_name, MCU_SLAVE_ADDR, SEND_REQUEST, DMP_MSG_HEAD_LENGTH + req_data_len, (const unsigned char*)&req);
