USB CDC Class Data transfer to host

lpcware — Thu, 16 Jun 2016 02:12:25 GMT

Content originally posted in LPCWare by saraswathi on Mon Jun 17 07:44:15 MST 2013
[LEFT]Hi,

I have a LPC11U24 device connected to a linux host.This device works in USB CDC class. Once the data is sent from device to host using [SIZE=2][SIZE=3][B]VCOM_bulk_in_hdlr,[/B] will the device wait for ACK from the host?[/SIZE][/SIZE]
[SIZE=2][SIZE=3][/SIZE][/SIZE]
[SIZE=2][SIZE=3]I have a situation where for the first read request from the host, the data is sent and received at the host. Immedietly if I send the second read request from the host, no operation happens at device. Also, if I try to generate interrupts from other IOs no interrupts get generated after first data transfer to host. [/SIZE][/SIZE]
[SIZE=2][SIZE=3][/SIZE][/SIZE]
[SIZE=2][SIZE=3]Can anyone please inform me does USB CDC mode operation of LPC11U24 requires ACK from host? If yes, what is the ACK format for linux.[/SIZE][/SIZE]
[SIZE=2][SIZE=3][/SIZE][/SIZE]
[SIZE=2][SIZE=3]Thanks in advance.[/SIZE][/SIZE]
[SIZE=2][SIZE=3][/SIZE][/SIZE]
[SIZE=2][SIZE=3]with regards[/SIZE][/SIZE]
[SIZE=2][SIZE=3]Saraswathi C[/SIZE]
[/SIZE] [/LEFT]

Re: USB CDC Class Data transfer to host

lpcware — Thu, 16 Jun 2016 02:12:26 GMT

Content originally posted in LPCWare by saraswathi on Thu Jun 20 04:05:01 MST 2013
I solved the problem.
The interrupt was genearted automtically but not handled at device side. Hence Hardfault was occuring. Hence device was not working after first data transmission.

topic USB CDC Class Data transfer to host in LPCXpresso IDE

USB CDC Class Data transfer to host

Re: USB CDC Class Data transfer to host