The subaddresssize should be 0
@@ -53,7 +53,7 @@ static rt_size_t master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg ms
xfer.slaveAddress = msg->addr;
xfer.flags = kI2C_TransferDefaultFlag;
xfer.subaddress = 0;
- xfer.subaddressSize = 1;
+ xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
