Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

Hung Bui — Fri, 20 Dec 2019 09:07:44 GMT

You are right, you need to add the configuration definition from the sdk_config.h

You can re-build the open thread library here: https://openthread.io/guides/build

But it would take some time to install the toolchain and build environment. If you just want to test UART, I would suggest to use UART1

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Fri, 20 Dec 2019 06:22:39 GMT

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Fri, 20 Dec 2019 06:18:23 GMT

[quote userid="2121" url="~/f/nordic-q-a/55732/access-to-uart-with-dma-under-example-freertos_coap_server-sdk-nrf52840-dk/226439"]In addition please add the configuration to sdk_config.h as showed in the example. [/quote]

Need to add all the definitions from this file?

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

Hung Bui — Thu, 19 Dec 2019 17:19:53 GMT

Hi Alexander,

Which issue do you have ?
You would need to add all the drivers and libraries as showed in the uart example into the freertos example. In addition please add the configuration to sdk_config.h as showed in the example.

One notice is that OpenThread is compiled with UART0 reserved for CLI (command line interface). If you are using nRF52840 you can use the UART1 instead. If you want to use UART0 for your application, you would need to recompile OpenThread.

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Thu, 19 Dec 2019 07:56:22 GMT

Can you show how you can combine the "peripheral\uart example" you specified with "freertos_coap_server"

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Thu, 19 Dec 2019 07:53:02 GMT

The whole problem is that there is no description of how to combine examples with each other. Conflicting library dependencies constantly arise.

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Thu, 19 Dec 2019 07:34:53 GMT

when I try to connect the necessary files from one example to another there are many conflicting dependencies.

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

alex — Thu, 19 Dec 2019 06:57:14 GMT

Hi Hung Bui!

How to transfer libraries from one cdk example to another? Maybe there is some kind of configurator, or only manually?

RE: Access to UART with DMA under example "freertos_coap_server" SDK nRF52840-DK

Hung Bui — Wed, 18 Dec 2019 16:20:32 GMT

Hi Alexander,

As long as you don't use UART in blocking mode, but in interrupt mode it should work fine with the freertos_coap_server. We provided the app_uart_fifo library that you can use. Please have a look at the peripheral\uart example in the SDK as the reference.
The maximum read/write buffer with DMA is defined by the MAXCNT register and it's upto 65kB. In the code it's defined by UART_RX_BUF_SIZE and UART_TX_BUF_SIZE