LP-AM243: How to detect completion of USB Device IN transfer

Hi Motofumi,

Motofumi Kibata said:

but is there a way to detect when transmission from FIFO to USB bus is complete?

By above do you mean that the actual time when the USB data is transferred via USB data bus?

Regards,

Tushar

Hi Tushar,

Thank you for your reply.

Tushar Thakur said:

By above do you mean that the actual time when the USB data is transferred via USB data bus?

Yes, I do.

best regards,

Motofumi

Hi Tushar,

Thank you for the information.

In the sample project I am looking at (cdc_echo_freertos_am243x-evm_r5fss0-0_freertos_ti-arm-clang), there is no access to the DRBL register in the channelTrigger function.

Which sample should I refer to?

best regards,

Motofumi

Hi Motofumi,

Sorry, for the confusion. I checked the code and it sets the EP_CMD register bits (DRDY and ERDY) to ring the dorbell. 

Regards,

Tushar

Hi Tushar,

Thank you for your reply.

I have already confirmed that writing to EP_CMD is implemented in the sample and that it works.

When writing to the EP_CMD register bits (DRDY and ERDY), if the host side has not issued an IN transfer request, I believe that no packets will be sent to the USB data bus.

In that case, is there a way to detect when an IN transfer request has arrived?
This refers to a situation where DMA transfer has already been completed and the system is waiting for an IN transfer request, such as the transmission of a null packet or short packet.

Hi Tushar,

This issue has been resolved. Thank you very much.

I have created a separate thread for another issue, so I would appreciate it if you could take a look at that as well.

(+) LP-AM243: How to use DFLUSH - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

best regards,

Motofumi