LPC MicrocontrollersのトピックRe: LPC5536 USB Does not Reinitiate after Replugging

LPC5536 USB Does not Reinitiate after Replugging

madhubanti — Thu, 29 May 2025 13:13:14 GMT

I am using the LPC5536 mcu. I am using the lpcxpresso55s36_dev_cdc_vcom_lite_bm example to establish my USB implementation.
From a circuit connection perspective i am using pins 98 and 99 as my DP and DM pins respectively for the USB.

My question is do i need to configure any other pin to make the connection successful?

I see in the example pin 92 which is VBUS is included in the pin configuration. Do i need to connect it to somewhere in my circuit diagram as well? or i can ignore it.

Re: LPC5536 USB Does not Reinitiate after Replugging

EdwinHz — Thu, 29 May 2025 21:13:44 GMT

Hi @madhubanti,

As mentioned on the readme.md file: "Because there is no dynamic detection between the host and the device, the COM port must be closed from the terminal tool prior to unplugging the CDC device. Otherwise, the CDC device won't get recognized next time when plugging in with the COM port still opened."

Are you making sure to follow this requirement?

Re: LPC5536 USB Does not Reinitiate after Replugging

madhubanti — Fri, 20 Jun 2025 11:49:10 GMT

My aplogoies. Can you tell me where to look for the readme file?

Re: LPC5536 USB Does not Reinitiate after Replugging

EdwinHz — Fri, 20 Jun 2025 17:23:54 GMT

Hi @madhubanti,

Of course, the comment I mentioned is in the "readme.md" file that is located under "lpcxpresso55s36_dev_cdc_vcom_lite_bm" > "doc" folder.