USB CDC ACM sending one byte at a time SDK V16

RE: USB CDC ACM sending one byte at a time SDK V16

nick_berg — Thu, 04 Jun 2020 10:58:22 GMT

Hey Edvind,

Sorry for the late response. After modifying the project for the board PCA10059 the example works fine. I am receiving the string "Timeout number: x" where x is the number of timeouts of the timer you set starting at 0. No anomalies in how I receive the text.

I tested sending UART data on a different dev-kit, the CC3220S Launch XL from Texas Instruments. I experienced the same problem where if is send data as soon as the port is opened, every character is interpreted as if it had "\n\r" behind it. This problem stops however after the initial message (on startup) is sent, so i guess it has something to do with either micro-controller startup, drivers or puTTY. It is not a real problem and since waiting 0.1 sec before sending the initial message solves my problems I wont spend anymore time on it.

Thanks for the help and the quick replies!

Nick

RE: USB CDC ACM sending one byte at a time SDK V16

Edvin — Thu, 28 May 2020 14:07:42 GMT

Hello,

I am sorry. I forgot to attach it. My mistake.

Attached now:

devzone.nordicsemi.com/.../usbd_5F00_cdc_5F00_acm_5F00_test.zip

BR,

Edvin

RE: USB CDC ACM sending one byte at a time SDK V16

nick_berg — Thu, 28 May 2020 11:37:15 GMT

Hey Edvin, thank you for your answer. I was unable to find any attached project in your message, if you meant the download on this page:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Fusbd_cdc_acm_example.html

It is a dead link. I do use putty and modified the keyboard settings to match the ones here:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_cli.html#lib_cli_terminal_settings

The other settings were already correct.

RE: USB CDC ACM sending one byte at a time SDK V16

Edvin — Wed, 27 May 2020 13:53:49 GMT

Hello,

Please check the attached project (SDK16.0.0). Just unzip it in the same location as the unmodified usbd_cdc_acm example. It should send a USB message every second. Does it print that one character on each line in your USB terminal as well?

If yes, can you please try to use Putty, and follow the settings the link "Terminal settings" on this page:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/usbd_cdc_acm_example.html

BR,

Edvin

RE: USB CDC ACM sending one byte at a time SDK V16

nick_berg — Wed, 27 May 2020 01:09:28 GMT

I guess it just needs time to initialize. I am sending as soon as the com port is opened by the user. I added a delay of 100ms before the message is sent. This does not interfere with user experience in any way. Messages after this initial period are sent without a problem. Is there any way to check if this initialization is done? I usually rather not use delays.