About LPC5528 USB DeviceStop function

xunwan — Wed, 21 Apr 2021 01:59:31 GMT

Hi，

When I use the USB1 of LPC5528, I want to turn off the device function through the USB_DeviceStop() function, but the result returned by calling the function fails. What may be the reason for this?

if (kStatus_USB_Success != USB_DeviceStop(g_composite.deviceHandle)){
USB_PDBG("USB Device Stop failed\r\n");
return kERROR_Fail;
}

Re: About LPC5528 USB DeviceStop function

FelipeGarcia — Thu, 22 Apr 2021 23:54:18 GMT

Hi,

I think this is an issue with the USB_DeviceLpc3511IpControl API. I tried to replicate this by using CDC SDK example and I was able to see USB_DeviceStop returned error.

As you can see error is first initialized as kStatus_USB_Error.

Then, when entering DeviceControlStop case you only modify registers and error flag is not modify, which means that error will still have initial value when exiting this function.

Have a great day,

Felipe

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About LPC5528 USB DeviceStop function

Re: About LPC5528 USB DeviceStop function