I need DMA support for UART Communication protocal

[Goudam]

HI ,

I need dma support for the uart protocol but I can't seem to locate any examples of it being used with an uart. Can anyone give support on this?

regards ,

Goudam

[Jørgen Holmefjord]

Hi,

Which SDK are you using? Most of the UART examples we have use EasyDMA, but not all use it in an efficient way for receive operations.

For nRF Connect SDK, I would recommend you to look at the example from lession 5 in Nordic Developer Academy: nRF Connect SDK Fundamentals course, or this sample.

For nRF5 SDK, the libUARTE example is the recommended example for UART with EasyDMA.

Best regards,
Jørgen

[Goudam]

Hi,

I am using nrf connect sdk  v2.4.0.

I'm using this example: github.com/.../main.c but I'm getting an ENOSYS error.

I'm using a xiao ble board with a nrf52840 controller.

Best regards,

Goudam

[Jørgen Holmefjord]

Goudam said:

I'm using this example: github.com/.../main.c but I'm getting an ENOSYS error.

Where/when do you get this error? Have you made any modifications to the sample/configuration?

Goudam said:

I'm using a xiao ble board with a nrf52840 controller.

To enable EasyDMA (UARTE), you should also add the following to your board DTS or overlay file for the uart0/uart1 devices:

compatible = "nordic,nrf-uarte";

[Goudam]

Jørgen Holmefjord said:

Where/when do you get this error? Have you made any modifications to the sample/configuration?

while calling this function  uart_callback_set(uart, uart_cb, NULL) i got the error ENOSYS.

Jørgen Holmefjord said:

To enable EasyDMA (UARTE), you should also add the following to your board DTS or overlay file for the uart0/uart1 devices:

&uart0 {
	compatible = "nordic,nrf-uarte";
	status = "okay";
	current-speed = <115200>;
	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};