With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Tue, 26 Nov 2019 13:58:46 GMT

Please replace the file main.c with the following

devzone.nordicsemi.com/.../0513.main.c

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Tue, 26 Nov 2019 13:37:23 GMT

I see there is a typecast error (the third error above). Could you tell me which line number is it and which function?

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Tue, 26 Nov 2019 13:28:47 GMT

devzone.nordicsemi.com/.../app_5F00_usbd_5F00_cdc_5F00_acm.c

devzone.nordicsemi.com/.../app_5F00_usbd_5F00_cdc_5F00_acm.h

Please copy these files to your directory (overwrite the existing ones). I've added the fourth parameter to get the actual number of bytes read.

myprojects\..\components\libraries\usbd\class\cdc\acm\

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

Jared — Tue, 26 Nov 2019 13:18:39 GMT

Hi,

The implicit declaration errors are removed but you still have errors regarding "too many arguments" in app_usbd_cdc_acm_read(). The function takes in 3 parameters not 4. It seems that you try to pass both a size parameter and a read_len. This should be fixed.

regards

Jared

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Mon, 25 Nov 2019 15:04:52 GMT

I've changed the libraries also. That's why there are errors. I removed the errors and tried it myself. The problem is still there. Attached is the same project with errors removed. Please let me know if you still get errors.

devzone.nordicsemi.com/.../6131.usbd_5F00_cdc_5F00_acm.zip

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

Jared — Mon, 25 Nov 2019 14:16:14 GMT

Hi,

I'm getting several errors when i'm trying to build your project in IAR. Could you just share your entire SDK that contains the project. That should solve the implicit declaration errors. Error P140 "too many arguments in function call" should be resolved before you upload the SDK.

regards

Jared

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Mon, 25 Nov 2019 13:14:42 GMT

Hi Jared,

From the source of the UART character, I send one character to NRF52840 and I get EVENT_RXDRDY in step 1. All other steps do not see EVENT_RXDRDY. According to the document of NRF52840, after TASK_FLUSHRX in step 3, I'm supposed to see EVENT_ENDRX (please correct me) but I never do. In my application, I cannot send any stop command and here I've not sent TASK_STOPRX at all. I've attached the whole project herewith. The directory it is

C:\nordic\nRF5SDK160098a08e2\myprojects\peripheral

devzone.nordicsemi.com/.../7271.usbd_5F00_cdc_5F00_acm.zip

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

Jared — Mon, 25 Nov 2019 11:28:28 GMT

Hi,

Is an EVENT_RXDRDY event generated between the step 1 and step 4
Do you stop the peripheral with TASKS_STOPRX before you read the AMOUNT register?
Can you share a minimal project that reproduce the error?

regards

Jared

RE: With NRF52840 UARTE0, I need to increase the buffer size from 1 byte to 64 bytes. But with this cannot receive 1 byte packet.

smanand1234 — Sat, 23 Nov 2019 23:43:29 GMT

To add, I want to use easyDMA for buffer of size 64 bytes but if only one byte is received for a long time, I internally generate FLUSHRX TASK. I see that immediately that one byte is in the RAM after 1 ms, but I do not get the AMOUNT register populated nor do I get ENDRX interrupt.

I need to implement the interrupt so that I can get as many as 64 bytes of data as a block but also be able to receive just one byte packet with the same routine. How can I achieve it?