Hello,

can somebody explain why the main thread in the sourcesink example is trying each 2 seconds to get the LPM back to U0?

With that code snippet:

        /* Try to get the USB 3.0 link back to U0. */
        {
            CyU3PUsbLinkPowerMode curState;

            if (CyU3PUsbGetSpeed () == CY_U3P_SUPER_SPEED)
            {
                /* If the link is in U1/U2 states, try to get back to U0. */
                stat = CyU3PUsbGetLinkPowerState (&curState);
                while ((stat == CY_U3P_SUCCESS) && (curState >= CyU3PUsbLPM_U1) && (curState <= CyU3PUsbLPM_U3))
                {
                    CyU3PUsbSetLinkPowerState (CyU3PUsbLPM_U0);
                    CyU3PThreadSleep (1);
                    stat = CyU3PUsbGetLinkPowerState (&curState);
                }
            }
        }
 

For what use is this?

Why polling each two seconds?

Why not doing this in the LPM callback function if the LPM state changes to other than U0?

Thanks,

lumpi

Hi Lumpi,

What is the version of the SDK that you are using. I could not find it in my projects.

Regards,

sai krishna.

Hi Sai Krishna,

it is FX3 SDK version 1.1.1 release B818. I append you the .c file of the USBBulkSourceSink example.

regards

Lumpi

Hi,

here the file again as a zip archiv.

regards,

lumpi

Hi Lumpi,

This part of code is not compulsory to have in your projects.

It is just that we intended to show a piece of code to come back into U0 mode incase if you get stuck in any low power mode.

Thanks,

sai krishna.