Validating the data over USB

[Saagar]

Hi ,

Device :-      nrf52840

USB class :- CDC ACM

We are sending the  ADC data (240 bytes at a time) to Host computer over USB (Full speed) and checking the received data in serial terminal (Tera Term),but we are missing the data because the tera term is not able to handle the full speed USB data. So is there any tool / how to get the data without any data loss.

and what is the maximum throughput we can achieve in USB full speed ?

Thanks & regards

Sagar

[Saagar]

Hi,

Let me very clear, There is already a delay ( reading the ADC data via SPI (operating at 2Mbps) filling the tx buffer(240 bytes) ) then sending it through USB. again I am adding delay manually of 200 microseconds. So total data I am sending is 14 MB/ Min.

Thanks & regards

Sagar

[ovrebekk]

Hi Sagar

Thanks for the clarification. 

Are you able to share your code with me, showing how you receive the data and pass it over to the USB stack?

Are you making sure to check the return values of all the USB functions, in order to detect if there could be any errors returned by any of them?

How do you see that the data is incorrect? 
Are you missing a byte here and there, or entire blocks of data?

Have you verified the incoming data (using the debugger for instance) to make sure that the problem happens after it is uploaded to the USB stack, and not before?

Best regards
Torbjørn