Dear all,
On the forum I found many posts about problems with the serial communication between MBED and the pc. I agree that these contain solutions that are helpful in most cases (I know because I have used them before). However, despite everything I read about trying to get a serial communication up-and-running again, I do not have found a solution for my issue.
let me post the issue and the steps I have taken (also based on information of many other forum postings):
System: Windows 7 (32bits), MBED LPC1768
Problem: no serial communication possible
At START:
Status device manager:
Ports (COM & LPT)
> mbed Serial Port (COM3) with exclamation mark (This device cannot start (code 10) )
Universal Serial Bus Controllers
> mbed Composite Device
> USB Composite Device
> USB Mass Storage Device
> USB Root Hub (#x)
Steps taken:
- Remove drivers from ‘Ports’ and ‘Universal Serial Bus Controller’ by using uninstall in Device Manager
- Also removed drivers manually from c:Windows/System32/Drivers/ mbed_Composite_x64.sys, mbedSerial_x64.sys They appeared to still exist after the previous step.
- Reboot of system
- Plug in the MBED device > Windows starts automatically installing a driver
Status device manager:
Ports (COM & LPT)
no mbed yet (which is ok as I haven’t installed the mbed driver yet)
Universal Serial Bus Controllers
- Install official mbed driver mbedWinSerial_16466 (which I obtained by using the Chrome browser, so not IE) > I end up with the same status of my device manager as the initial START one. So now I do have:
Ports (COM & LPT)
mbed Serial Port (COM3) with exclamation mark (This device cannot start (code 10) )
- I tried rebooting on this step as well as without rebooting on this step. No difference.
- Changing the port number to another free port does not resolve this issue.
- If I disable and then enable the mbed Serial Port then the exclamation mark and error ‘(This device cannot start (code 10) )’ has disappeared and I end up with the status that the device should be working properly. However, I still get no ‘hello world’ message on my machine so the problem isn’t resolved at all.
- Using other USB ports to plug in my mbed device isn’t a solution either.
Furthermore:
- I have used mbed devices many times before on the same PC system, so it should work.
- This specific mbed device works fine on another PC, I do get a ‘hello world’ here, so it’s not broke.
- Besides this, I am sure that my code is running properly as I have used the LEDs to verify by letting them flash in a certain identifiable pattern.
- I obviously tried variations on the above scheme but this didn't help.
- In one variation I used mbed search in regedit and removed one file with MBED in the name (can't recall). No solution either.
What can I do or try to get the serial communication up and running again? I hope somebody has a clue what to do because I am lost here.
Thank you.
Dear all,
On the forum I found many posts about problems with the serial communication between MBED and the pc. I agree that these contain solutions that are helpful in most cases (I know because I have used them before). However, despite everything I read about trying to get a serial communication up-and-running again, I do not have found a solution for my issue.
let me post the issue and the steps I have taken (also based on information of many other forum postings):
System: Windows 7 (32bits), MBED LPC1768
Problem: no serial communication possible
At START:
Status device manager:
Ports (COM & LPT)
> mbed Serial Port (COM3) with exclamation mark (This device cannot start (code 10) )
Universal Serial Bus Controllers > mbed Composite Device
> USB Composite Device
> USB Mass Storage Device
> USB Root Hub (#x)
Steps taken:
- Remove drivers from ‘Ports’ and ‘Universal Serial Bus Controller’ by using uninstall in Device Manager
- Also removed drivers manually from c:Windows/System32/Drivers/ mbed_Composite_x64.sys, mbedSerial_x64.sys They appeared to still exist after the previous step.
- Reboot of system
- Plug in the MBED device > Windows starts automatically installing a driver
Status device manager:
Ports (COM & LPT)
no mbed yet (which is ok as I haven’t installed the mbed driver yet)
Universal Serial Bus Controllers
USB Composite Device
USB Mass Storage Device
- Install official mbed driver mbedWinSerial_16466 (which I obtained by using the Chrome browser, so not IE) > I end up with the same status of my device manager as the initial START one. So now I do have:
Ports (COM & LPT)
mbed Serial Port (COM3) with exclamation mark (This device cannot start (code 10) )
- I tried rebooting on this step as well as without rebooting on this step. No difference.
- Changing the port number to another free port does not resolve this issue.
- If I disable and then enable the mbed Serial Port then the exclamation mark and error ‘(This device cannot start (code 10) )’ has disappeared and I end up with the status that the device should be working properly. However, I still get no ‘hello world’ message on my machine so the problem isn’t resolved at all.
- Using other USB ports to plug in my mbed device isn’t a solution either.
Furthermore:
- I have used mbed devices many times before on the same PC system, so it should work.
- This specific mbed device works fine on another PC, I do get a ‘hello world’ here, so it’s not broke.
- Besides this, I am sure that my code is running properly as I have used the LEDs to verify by letting them flash in a certain identifiable pattern.
- I obviously tried variations on the above scheme but this didn't help.
- In one variation I used mbed search in regedit and removed one file with MBED in the name (can't recall). No solution either.
What can I do or try to get the serial communication up and running again? I hope somebody has a clue what to do because I am lost here.
Thank you.