serialport - how to reopen port after handle was lost

Question

Lukas Mayer 2021-12-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1610300-serialport-how-to-reopen-port-after-handle-was-lost

回答： kate_w 2023-4-26

During replacing serial with serialport, I cannot open the port again after the handle was lost (e.g. because it was used in a function that terminated with an error).

I seem to be able to reset the port and reopen with serialport by using clear all but that cannot be it!? Isn't there something that works like delete(instrfind) for the older serial function?

In other words: what would i need between line 2 and line 3 if I lost the variable s:

clear all;
s=serialport('COM9',115200);
t=serialport('COM9',115200);

Error using serialport (line 116)

Unable to connect to the serialport device at port 'COM9'. Verify that a device is connected to the port, the port is not in use, and all serialport input arguments and parameter

values are supported by the device.

See related documentation for troubleshooting steps.

Please help!