问题app内打开串口1的时候提示打开失败了2026-06-01 14:01:52.713 15736-15736 SerialPort com.rongbang.chargingcabinet E java.io.IOException: Cannot run program "/system/bin/su": error=2, No such file or directory 2026-06-01 14:01:52.713 15736-15736 System.out com.rongbang.chargingcabinet I /dev/ttyS1============================== 2026-06-01 14:01:52.713 15736-15736 serial_port com.rongbang.chargingcabinet D Opening serial port /dev/ttyS1 with flags 0x2 2026-06-01 14:01:52.713 15736-15736 serial_port com.rongbang.chargingcabinet D open() fd = -1 2026-06-01 14:01:52.713 15736-15736 serial_port com.rongbang.chargingcabinet E Cannot open port 2026-06-01 14: